diff --git a/Cargo.lock b/Cargo.lock
index 41c5d36671..d27ae416f0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -112,6 +112,12 @@ version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
 
+[[package]]
+name = "byteorder"
+version = "1.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
+
 [[package]]
 name = "camino"
 version = "1.1.1"
@@ -171,9 +177,9 @@ checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
 [[package]]
 name = "chalk-derive"
-version = "0.86.0"
+version = "0.88.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5499d415d855b5094366a824815341893ad3de0ecb6048c430118bdae6d27402"
+checksum = "4df80a3fbc1f0e59f560eeeebca94bf655566a8ad3023c210a109deb6056455a"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -183,9 +189,9 @@ dependencies = [
 
 [[package]]
 name = "chalk-ir"
-version = "0.86.0"
+version = "0.88.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3800118c76a48507b0eece3a01f3a429b5c478d203c493096e6040c67ab960e1"
+checksum = "f39e5272016916956298cceea5147006f897972c274a768ed4d6e074efe5d3fb"
 dependencies = [
  "bitflags",
  "chalk-derive",
@@ -194,9 +200,9 @@ dependencies = [
 
 [[package]]
 name = "chalk-recursive"
-version = "0.86.0"
+version = "0.88.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1baf60628fd73104d1f8562586a52d48f37f1e84435aab2e62674b1fd935b8c8"
+checksum = "d9d60b42ad7478d3e027e2f9ea4e99fbbb8fdee0c8c3cf068be269f57e603618"
 dependencies = [
  "chalk-derive",
  "chalk-ir",
@@ -207,9 +213,9 @@ dependencies = [
 
 [[package]]
 name = "chalk-solve"
-version = "0.86.0"
+version = "0.88.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0e9c3c068f9358786348e58a1b94ef0a5cf90a9810fc1f10fda896f0b5d80185"
+checksum = "ab30620ea5b36819525eaab2204f4b8e1842fc7ee36826424a28bef59ae7fecf"
 dependencies = [
  "chalk-derive",
  "chalk-ir",
@@ -510,6 +516,8 @@ dependencies = [
  "fst",
  "hashbrown",
  "hir-expand",
+ "hkalbasi-rustc-ap-rustc_abi",
+ "hkalbasi-rustc-ap-rustc_index",
  "indexmap",
  "itertools",
  "la-arena",
@@ -555,6 +563,7 @@ version = "0.0.0"
 dependencies = [
  "arrayvec",
  "base-db",
+ "bitflags",
  "chalk-derive",
  "chalk-ir",
  "chalk-recursive",
@@ -564,6 +573,7 @@ dependencies = [
  "expect-test",
  "hir-def",
  "hir-expand",
+ "hkalbasi-rustc-ap-rustc_index",
  "itertools",
  "la-arena",
  "limit",
@@ -581,6 +591,27 @@ dependencies = [
  "typed-arena",
 ]
 
+[[package]]
+name = "hkalbasi-rustc-ap-rustc_abi"
+version = "0.0.20221221"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "adabaadad9aa7576f97af02241cdf5554d62fb3d51a84cb05d77ba28edd3013f"
+dependencies = [
+ "bitflags",
+ "hkalbasi-rustc-ap-rustc_index",
+ "tracing",
+]
+
+[[package]]
+name = "hkalbasi-rustc-ap-rustc_index"
+version = "0.0.20221221"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f4d3c48474e09afb0f5efbd6f758e05411699301a113c47d454d28ec7059d00e"
+dependencies = [
+ "arrayvec",
+ "smallvec",
+]
+
 [[package]]
 name = "home"
 version = "0.5.4"
@@ -631,6 +662,7 @@ dependencies = [
  "ide-db",
  "itertools",
  "profile",
+ "smallvec",
  "sourcegen",
  "stdx",
  "syntax",
@@ -1750,6 +1782,33 @@ dependencies = [
  "tikv-jemalloc-sys",
 ]
 
+[[package]]
+name = "time"
+version = "0.3.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a561bf4617eebd33bca6434b988f39ed798e527f51a1e797d0ee4f61c0a38376"
+dependencies = [
+ "itoa",
+ "serde",
+ "time-core",
+ "time-macros",
+]
+
+[[package]]
+name = "time-core"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2e153e1f1acaef8acc537e68b44906d2db6436e2b35ac2c6b42640fff91f00fd"
+
+[[package]]
+name = "time-macros"
+version = "0.2.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d967f99f534ca7e495c575c62638eebc2898a8c84c119b89e250477bc4ba16b2"
+dependencies = [
+ "time-core",
+]
+
 [[package]]
 name = "tinyvec"
 version = "1.6.0"
@@ -2148,4 +2207,18 @@ dependencies = [
  "write-json",
  "xflags",
  "xshell",
+ "zip",
+]
+
+[[package]]
+name = "zip"
+version = "0.6.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "537ce7411d25e54e8ae21a7ce0b15840e7bfcff15b51d697ec3266cc76bdf080"
+dependencies = [
+ "byteorder",
+ "crc32fast",
+ "crossbeam-utils",
+ "flate2",
+ "time",
 ]
diff --git a/crates/base-db/src/fixture.rs b/crates/base-db/src/fixture.rs
index 5b7828a269..6f83ea40e7 100644
--- a/crates/base-db/src/fixture.rs
+++ b/crates/base-db/src/fixture.rs
@@ -162,6 +162,7 @@ impl ChangeFixture {
                     Ok(Vec::new()),
                     false,
                     origin,
+                    meta.target_data_layout.as_deref().map(Arc::from),
                 );
                 let prev = crates.insert(crate_name.clone(), crate_id);
                 assert!(prev.is_none());
@@ -197,6 +198,7 @@ impl ChangeFixture {
                 Ok(Vec::new()),
                 false,
                 CrateOrigin::CratesIo { repo: None, name: None },
+                None,
             );
         } else {
             for (from, to, prelude) in crate_deps {
@@ -210,6 +212,8 @@ impl ChangeFixture {
                     .unwrap();
             }
         }
+        let target_layout =
+            crate_graph.iter().next().and_then(|it| crate_graph[it].target_layout.clone());
 
         if let Some(mini_core) = mini_core {
             let core_file = file_id;
@@ -234,6 +238,7 @@ impl ChangeFixture {
                 Ok(Vec::new()),
                 false,
                 CrateOrigin::Lang(LangCrateOrigin::Core),
+                target_layout.clone(),
             );
 
             for krate in all_crates {
@@ -271,6 +276,7 @@ impl ChangeFixture {
                 Ok(proc_macro),
                 true,
                 CrateOrigin::CratesIo { repo: None, name: None },
+                target_layout,
             );
 
             for krate in all_crates {
@@ -391,6 +397,7 @@ struct FileMeta {
     edition: Edition,
     env: Env,
     introduce_new_source_root: Option<SourceRootKind>,
+    target_data_layout: Option<String>,
 }
 
 fn parse_crate(crate_str: String) -> (String, CrateOrigin, Option<String>) {
@@ -400,9 +407,9 @@ fn parse_crate(crate_str: String) -> (String, CrateOrigin, Option<String>) {
                 Some((version, url)) => {
                     (version, CrateOrigin::CratesIo { repo: Some(url.to_owned()), name: None })
                 }
-                _ => panic!("Bad crates.io parameter: {}", data),
+                _ => panic!("Bad crates.io parameter: {data}"),
             },
-            _ => panic!("Bad string for crate origin: {}", b),
+            _ => panic!("Bad string for crate origin: {b}"),
         };
         (a.to_owned(), origin, Some(version.to_string()))
     } else {
@@ -432,8 +439,9 @@ impl From<Fixture> for FileMeta {
             introduce_new_source_root: f.introduce_new_source_root.map(|kind| match &*kind {
                 "local" => SourceRootKind::Local,
                 "library" => SourceRootKind::Library,
-                invalid => panic!("invalid source root kind '{}'", invalid),
+                invalid => panic!("invalid source root kind '{invalid}'"),
             }),
+            target_data_layout: f.target_data_layout,
         }
     }
 }
diff --git a/crates/base-db/src/input.rs b/crates/base-db/src/input.rs
index e7f0c4ec29..5fa4a80249 100644
--- a/crates/base-db/src/input.rs
+++ b/crates/base-db/src/input.rs
@@ -128,7 +128,7 @@ impl fmt::Display for CrateName {
 impl ops::Deref for CrateName {
     type Target = str;
     fn deref(&self) -> &str {
-        &*self.0
+        &self.0
     }
 }
 
@@ -211,7 +211,7 @@ impl fmt::Display for CrateDisplayName {
 impl ops::Deref for CrateDisplayName {
     type Target = str;
     fn deref(&self) -> &str {
-        &*self.crate_name
+        &self.crate_name
     }
 }
 
@@ -270,6 +270,7 @@ pub struct CrateData {
     pub display_name: Option<CrateDisplayName>,
     pub cfg_options: CfgOptions,
     pub potential_cfg_options: CfgOptions,
+    pub target_layout: Option<Arc<str>>,
     pub env: Env,
     pub dependencies: Vec<Dependency>,
     pub proc_macro: ProcMacroLoadResult,
@@ -328,6 +329,7 @@ impl CrateGraph {
         proc_macro: ProcMacroLoadResult,
         is_proc_macro: bool,
         origin: CrateOrigin,
+        target_layout: Option<Arc<str>>,
     ) -> CrateId {
         let data = CrateData {
             root_file_id,
@@ -340,6 +342,7 @@ impl CrateGraph {
             proc_macro,
             dependencies: Vec::new(),
             origin,
+            target_layout,
             is_proc_macro,
         };
         let crate_id = CrateId(self.arena.len() as u32);
@@ -615,8 +618,8 @@ impl CyclicDependenciesError {
 impl fmt::Display for CyclicDependenciesError {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         let render = |(id, name): &(CrateId, Option<CrateDisplayName>)| match name {
-            Some(it) => format!("{}({:?})", it, id),
-            None => format!("{:?}", id),
+            Some(it) => format!("{it}({id:?})"),
+            None => format!("{id:?}"),
         };
         let path = self.path.iter().rev().map(render).collect::<Vec<String>>().join(" -> ");
         write!(
@@ -649,6 +652,7 @@ mod tests {
             Ok(Vec::new()),
             false,
             CrateOrigin::CratesIo { repo: None, name: None },
+            None,
         );
         let crate2 = graph.add_crate_root(
             FileId(2u32),
@@ -661,6 +665,7 @@ mod tests {
             Ok(Vec::new()),
             false,
             CrateOrigin::CratesIo { repo: None, name: None },
+            None,
         );
         let crate3 = graph.add_crate_root(
             FileId(3u32),
@@ -673,6 +678,7 @@ mod tests {
             Ok(Vec::new()),
             false,
             CrateOrigin::CratesIo { repo: None, name: None },
+            None,
         );
         assert!(graph
             .add_dep(crate1, Dependency::new(CrateName::new("crate2").unwrap(), crate2))
@@ -699,6 +705,7 @@ mod tests {
             Ok(Vec::new()),
             false,
             CrateOrigin::CratesIo { repo: None, name: None },
+            None,
         );
         let crate2 = graph.add_crate_root(
             FileId(2u32),
@@ -711,6 +718,7 @@ mod tests {
             Ok(Vec::new()),
             false,
             CrateOrigin::CratesIo { repo: None, name: None },
+            None,
         );
         assert!(graph
             .add_dep(crate1, Dependency::new(CrateName::new("crate2").unwrap(), crate2))
@@ -734,6 +742,7 @@ mod tests {
             Ok(Vec::new()),
             false,
             CrateOrigin::CratesIo { repo: None, name: None },
+            None,
         );
         let crate2 = graph.add_crate_root(
             FileId(2u32),
@@ -746,6 +755,7 @@ mod tests {
             Ok(Vec::new()),
             false,
             CrateOrigin::CratesIo { repo: None, name: None },
+            None,
         );
         let crate3 = graph.add_crate_root(
             FileId(3u32),
@@ -758,6 +768,7 @@ mod tests {
             Ok(Vec::new()),
             false,
             CrateOrigin::CratesIo { repo: None, name: None },
+            None,
         );
         assert!(graph
             .add_dep(crate1, Dependency::new(CrateName::new("crate2").unwrap(), crate2))
@@ -781,6 +792,7 @@ mod tests {
             Ok(Vec::new()),
             false,
             CrateOrigin::CratesIo { repo: None, name: None },
+            None,
         );
         let crate2 = graph.add_crate_root(
             FileId(2u32),
@@ -793,6 +805,7 @@ mod tests {
             Ok(Vec::new()),
             false,
             CrateOrigin::CratesIo { repo: None, name: None },
+            None,
         );
         assert!(graph
             .add_dep(
diff --git a/crates/base-db/src/lib.rs b/crates/base-db/src/lib.rs
index da11e4ae7b..55a51d3bbb 100644
--- a/crates/base-db/src/lib.rs
+++ b/crates/base-db/src/lib.rs
@@ -75,9 +75,9 @@ pub trait SourceDatabase: FileLoader + std::fmt::Debug {
 }
 
 fn parse_query(db: &dyn SourceDatabase, file_id: FileId) -> Parse<ast::SourceFile> {
-    let _p = profile::span("parse_query").detail(|| format!("{:?}", file_id));
+    let _p = profile::span("parse_query").detail(|| format!("{file_id:?}"));
     let text = db.file_text(file_id);
-    SourceFile::parse(&*text)
+    SourceFile::parse(&text)
 }
 
 /// We don't want to give HIR knowledge of source roots, hence we extract these
diff --git a/crates/cfg/src/cfg_expr.rs b/crates/cfg/src/cfg_expr.rs
index fd9e31ed3b..5f4eefa836 100644
--- a/crates/cfg/src/cfg_expr.rs
+++ b/crates/cfg/src/cfg_expr.rs
@@ -44,7 +44,7 @@ impl fmt::Display for CfgAtom {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
             CfgAtom::Flag(name) => name.fmt(f),
-            CfgAtom::KeyValue { key, value } => write!(f, "{} = {:?}", key, value),
+            CfgAtom::KeyValue { key, value } => write!(f, "{key} = {value:?}"),
         }
     }
 }
diff --git a/crates/cfg/src/lib.rs b/crates/cfg/src/lib.rs
index d78ef4fb11..30709c968d 100644
--- a/crates/cfg/src/lib.rs
+++ b/crates/cfg/src/lib.rs
@@ -37,7 +37,7 @@ impl fmt::Debug for CfgOptions {
             .iter()
             .map(|atom| match atom {
                 CfgAtom::Flag(it) => it.to_string(),
-                CfgAtom::KeyValue { key, value } => format!("{}={}", key, value),
+                CfgAtom::KeyValue { key, value } => format!("{key}={value}"),
             })
             .collect::<Vec<_>>();
         items.sort();
@@ -175,7 +175,7 @@ impl fmt::Display for InactiveReason {
                 atom.fmt(f)?;
             }
             let is_are = if self.enabled.len() == 1 { "is" } else { "are" };
-            write!(f, " {} enabled", is_are)?;
+            write!(f, " {is_are} enabled")?;
 
             if !self.disabled.is_empty() {
                 f.write_str(" and ")?;
@@ -194,7 +194,7 @@ impl fmt::Display for InactiveReason {
                 atom.fmt(f)?;
             }
             let is_are = if self.disabled.len() == 1 { "is" } else { "are" };
-            write!(f, " {} disabled", is_are)?;
+            write!(f, " {is_are} disabled")?;
         }
 
         Ok(())
diff --git a/crates/flycheck/src/lib.rs b/crates/flycheck/src/lib.rs
index 8f93dad06e..11f7b068ec 100644
--- a/crates/flycheck/src/lib.rs
+++ b/crates/flycheck/src/lib.rs
@@ -47,6 +47,7 @@ pub enum FlycheckConfig {
         features: Vec<String>,
         extra_args: Vec<String>,
         extra_env: FxHashMap<String, String>,
+        ansi_color_output: bool,
     },
     CustomCommand {
         command: String,
@@ -60,9 +61,9 @@ pub enum FlycheckConfig {
 impl fmt::Display for FlycheckConfig {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
-            FlycheckConfig::CargoCommand { command, .. } => write!(f, "cargo {}", command),
+            FlycheckConfig::CargoCommand { command, .. } => write!(f, "cargo {command}"),
             FlycheckConfig::CustomCommand { command, args, .. } => {
-                write!(f, "{} {}", command, args.join(" "))
+                write!(f, "{command} {}", args.join(" "))
             }
         }
     }
@@ -293,15 +294,24 @@ impl FlycheckActor {
                 extra_args,
                 features,
                 extra_env,
+                ansi_color_output,
             } => {
                 let mut cmd = Command::new(toolchain::cargo());
                 cmd.arg(command);
                 cmd.current_dir(&self.root);
-                cmd.args(&["--workspace", "--message-format=json", "--manifest-path"])
-                    .arg(self.root.join("Cargo.toml").as_os_str());
+                cmd.arg("--workspace");
+
+                cmd.arg(if *ansi_color_output {
+                    "--message-format=json-diagnostic-rendered-ansi"
+                } else {
+                    "--message-format=json"
+                });
+
+                cmd.arg("--manifest-path");
+                cmd.arg(self.root.join("Cargo.toml").as_os_str());
 
                 for target in target_triples {
-                    cmd.args(&["--target", target.as_str()]);
+                    cmd.args(["--target", target.as_str()]);
                 }
                 if *all_targets {
                     cmd.arg("--all-targets");
@@ -360,13 +370,20 @@ impl FlycheckActor {
     }
 }
 
-struct JodChild(GroupChild);
+struct JodGroupChild(GroupChild);
+
+impl Drop for JodGroupChild {
+    fn drop(&mut self) {
+        _ = self.0.kill();
+        _ = self.0.wait();
+    }
+}
 
 /// A handle to a cargo process used for fly-checking.
 struct CargoHandle {
     /// The handle to the actual cargo process. As we cannot cancel directly from with
     /// a read syscall dropping and therefore terminating the process is our best option.
-    child: JodChild,
+    child: JodGroupChild,
     thread: jod_thread::JoinHandle<io::Result<(bool, String)>>,
     receiver: Receiver<CargoMessage>,
 }
@@ -374,7 +391,7 @@ struct CargoHandle {
 impl CargoHandle {
     fn spawn(mut command: Command) -> std::io::Result<CargoHandle> {
         command.stdout(Stdio::piped()).stderr(Stdio::piped()).stdin(Stdio::null());
-        let mut child = command.group_spawn().map(JodChild)?;
+        let mut child = command.group_spawn().map(JodGroupChild)?;
 
         let stdout = child.0.inner().stdout.take().unwrap();
         let stderr = child.0.inner().stderr.take().unwrap();
@@ -401,8 +418,7 @@ impl CargoHandle {
             Ok(())
         } else {
             Err(io::Error::new(io::ErrorKind::Other, format!(
-                "Cargo watcher failed, the command produced no valid metadata (exit code: {:?}):\n{}",
-                exit_status, error
+                "Cargo watcher failed, the command produced no valid metadata (exit code: {exit_status:?}):\n{error}"
             )))
         }
     }
@@ -467,7 +483,7 @@ impl CargoActor {
         );
         match output {
             Ok(_) => Ok((read_at_least_one_message, error)),
-            Err(e) => Err(io::Error::new(e.kind(), format!("{:?}: {}", e, error))),
+            Err(e) => Err(io::Error::new(e.kind(), format!("{e:?}: {error}"))),
         }
     }
 }
diff --git a/crates/hir-def/Cargo.toml b/crates/hir-def/Cargo.toml
index 22f98ea7cd..698be76656 100644
--- a/crates/hir-def/Cargo.toml
+++ b/crates/hir-def/Cargo.toml
@@ -33,6 +33,8 @@ base-db = { path = "../base-db", version = "0.0.0" }
 syntax = { path = "../syntax", version = "0.0.0" }
 profile = { path = "../profile", version = "0.0.0" }
 hir-expand = { path = "../hir-expand", version = "0.0.0" }
+rustc_abi = { version = "0.0.20221221", package = "hkalbasi-rustc-ap-rustc_abi", default-features = false }
+rustc_index = { version = "0.0.20221221", package = "hkalbasi-rustc-ap-rustc_index", default-features = false }
 mbe = { path = "../mbe", version = "0.0.0" }
 cfg = { path = "../cfg", version = "0.0.0" }
 tt = { path = "../tt", version = "0.0.0" }
diff --git a/crates/hir-def/src/adt.rs b/crates/hir-def/src/adt.rs
index 938db032fb..db3b419488 100644
--- a/crates/hir-def/src/adt.rs
+++ b/crates/hir-def/src/adt.rs
@@ -1,6 +1,6 @@
 //! Defines hir-level representation of structs, enums and unions
 
-use std::{num::NonZeroU32, sync::Arc};
+use std::sync::Arc;
 
 use base_db::CrateId;
 use either::Either;
@@ -9,6 +9,7 @@ use hir_expand::{
     HirFileId, InFile,
 };
 use la_arena::{Arena, ArenaMap};
+use rustc_abi::{Integer, IntegerType};
 use syntax::ast::{self, HasName, HasVisibility};
 use tt::{Delimiter, DelimiterKind, Leaf, Subtree, TokenTree};
 
@@ -18,6 +19,7 @@ use crate::{
     db::DefDatabase,
     intern::Interned,
     item_tree::{AttrOwner, Field, FieldAstId, Fields, ItemTree, ModItem, RawVisibilityId},
+    layout::{Align, ReprFlags, ReprOptions},
     nameres::diagnostics::DefDiagnostic,
     src::HasChildSource,
     src::HasSource,
@@ -34,16 +36,18 @@ use cfg::CfgOptions;
 pub struct StructData {
     pub name: Name,
     pub variant_data: Arc<VariantData>,
-    pub repr: Option<ReprData>,
+    pub repr: Option<ReprOptions>,
     pub visibility: RawVisibility,
+    pub rustc_has_incoherent_inherent_impls: bool,
 }
 
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub struct EnumData {
     pub name: Name,
     pub variants: Arena<EnumVariantData>,
-    pub repr: Option<ReprData>,
+    pub repr: Option<ReprOptions>,
     pub visibility: RawVisibility,
+    pub rustc_has_incoherent_inherent_impls: bool,
 }
 
 #[derive(Debug, Clone, PartialEq, Eq)]
@@ -67,80 +71,91 @@ pub struct FieldData {
     pub visibility: RawVisibility,
 }
 
-#[derive(Copy, Debug, Clone, PartialEq, Eq)]
-pub enum ReprKind {
-    C,
-    BuiltinInt { builtin: Either<BuiltinInt, BuiltinUint>, is_c: bool },
-    Transparent,
-    Default,
-}
-
-#[derive(Copy, Debug, Clone, PartialEq, Eq)]
-pub struct ReprData {
-    pub kind: ReprKind,
-    pub packed: bool,
-    pub align: Option<NonZeroU32>,
-}
-
 fn repr_from_value(
     db: &dyn DefDatabase,
     krate: CrateId,
     item_tree: &ItemTree,
     of: AttrOwner,
-) -> Option<ReprData> {
+) -> Option<ReprOptions> {
     item_tree.attrs(db, krate, of).by_key("repr").tt_values().find_map(parse_repr_tt)
 }
 
-fn parse_repr_tt(tt: &Subtree) -> Option<ReprData> {
+fn parse_repr_tt(tt: &Subtree) -> Option<ReprOptions> {
     match tt.delimiter {
         Some(Delimiter { kind: DelimiterKind::Parenthesis, .. }) => {}
         _ => return None,
     }
 
-    let mut data = ReprData { kind: ReprKind::Default, packed: false, align: None };
+    let mut flags = ReprFlags::empty();
+    let mut int = None;
+    let mut max_align: Option<Align> = None;
+    let mut min_pack: Option<Align> = None;
 
     let mut tts = tt.token_trees.iter().peekable();
     while let Some(tt) = tts.next() {
         if let TokenTree::Leaf(Leaf::Ident(ident)) = tt {
-            match &*ident.text {
+            flags.insert(match &*ident.text {
                 "packed" => {
-                    data.packed = true;
-                    if let Some(TokenTree::Subtree(_)) = tts.peek() {
+                    let pack = if let Some(TokenTree::Subtree(tt)) = tts.peek() {
                         tts.next();
-                    }
+                        if let Some(TokenTree::Leaf(Leaf::Literal(lit))) = tt.token_trees.first() {
+                            lit.text.parse().unwrap_or_default()
+                        } else {
+                            0
+                        }
+                    } else {
+                        0
+                    };
+                    let pack = Align::from_bytes(pack).unwrap();
+                    min_pack =
+                        Some(if let Some(min_pack) = min_pack { min_pack.min(pack) } else { pack });
+                    ReprFlags::empty()
                 }
                 "align" => {
                     if let Some(TokenTree::Subtree(tt)) = tts.peek() {
                         tts.next();
                         if let Some(TokenTree::Leaf(Leaf::Literal(lit))) = tt.token_trees.first() {
                             if let Ok(align) = lit.text.parse() {
-                                data.align = Some(align);
+                                let align = Align::from_bytes(align).ok();
+                                max_align = max_align.max(align);
                             }
                         }
                     }
+                    ReprFlags::empty()
                 }
-                "C" => {
-                    if let ReprKind::BuiltinInt { is_c, .. } = &mut data.kind {
-                        *is_c = true;
-                    } else {
-                        data.kind = ReprKind::C;
-                    }
-                }
-                "transparent" => data.kind = ReprKind::Transparent,
+                "C" => ReprFlags::IS_C,
+                "transparent" => ReprFlags::IS_TRANSPARENT,
                 repr => {
-                    let is_c = matches!(data.kind, ReprKind::C);
                     if let Some(builtin) = BuiltinInt::from_suffix(repr)
                         .map(Either::Left)
                         .or_else(|| BuiltinUint::from_suffix(repr).map(Either::Right))
                     {
-                        data.kind = ReprKind::BuiltinInt { builtin, is_c };
+                        int = Some(match builtin {
+                            Either::Left(bi) => match bi {
+                                BuiltinInt::Isize => IntegerType::Pointer(true),
+                                BuiltinInt::I8 => IntegerType::Fixed(Integer::I8, true),
+                                BuiltinInt::I16 => IntegerType::Fixed(Integer::I16, true),
+                                BuiltinInt::I32 => IntegerType::Fixed(Integer::I32, true),
+                                BuiltinInt::I64 => IntegerType::Fixed(Integer::I64, true),
+                                BuiltinInt::I128 => IntegerType::Fixed(Integer::I128, true),
+                            },
+                            Either::Right(bu) => match bu {
+                                BuiltinUint::Usize => IntegerType::Pointer(false),
+                                BuiltinUint::U8 => IntegerType::Fixed(Integer::I8, false),
+                                BuiltinUint::U16 => IntegerType::Fixed(Integer::I16, false),
+                                BuiltinUint::U32 => IntegerType::Fixed(Integer::I32, false),
+                                BuiltinUint::U64 => IntegerType::Fixed(Integer::I64, false),
+                                BuiltinUint::U128 => IntegerType::Fixed(Integer::I128, false),
+                            },
+                        });
                     }
+                    ReprFlags::empty()
                 }
-            }
+            })
         }
     }
 
-    Some(data)
+    Some(ReprOptions { int, align: max_align, pack: min_pack, flags, field_shuffle_seed: 0 })
 }
 
 impl StructData {
@@ -157,6 +172,10 @@ impl StructData {
         let item_tree = loc.id.item_tree(db);
         let repr = repr_from_value(db, krate, &item_tree, ModItem::from(loc.id.value).into());
         let cfg_options = db.crate_graph()[loc.container.krate].cfg_options.clone();
+        let rustc_has_incoherent_inherent_impls = item_tree
+            .attrs(db, loc.container.krate, ModItem::from(loc.id.value).into())
+            .by_key("rustc_has_incoherent_inherent_impls")
+            .exists();
 
         let strukt = &item_tree[loc.id.value];
         let (variant_data, diagnostics) = lower_fields(
@@ -175,6 +194,7 @@ impl StructData {
                 variant_data: Arc::new(variant_data),
                 repr,
                 visibility: item_tree[strukt.visibility].clone(),
+                rustc_has_incoherent_inherent_impls,
             }),
             diagnostics.into(),
         )
@@ -194,6 +214,11 @@ impl StructData {
         let repr = repr_from_value(db, krate, &item_tree, ModItem::from(loc.id.value).into());
         let cfg_options = db.crate_graph()[loc.container.krate].cfg_options.clone();
 
+        let rustc_has_incoherent_inherent_impls = item_tree
+            .attrs(db, loc.container.krate, ModItem::from(loc.id.value).into())
+            .by_key("rustc_has_incoherent_inherent_impls")
+            .exists();
+
         let union = &item_tree[loc.id.value];
         let (variant_data, diagnostics) = lower_fields(
             db,
@@ -211,6 +236,7 @@ impl StructData {
                 variant_data: Arc::new(variant_data),
                 repr,
                 visibility: item_tree[union.visibility].clone(),
+                rustc_has_incoherent_inherent_impls,
             }),
             diagnostics.into(),
         )
@@ -231,6 +257,10 @@ impl EnumData {
         let item_tree = loc.id.item_tree(db);
         let cfg_options = db.crate_graph()[krate].cfg_options.clone();
         let repr = repr_from_value(db, krate, &item_tree, ModItem::from(loc.id.value).into());
+        let rustc_has_incoherent_inherent_impls = item_tree
+            .attrs(db, loc.container.krate, ModItem::from(loc.id.value).into())
+            .by_key("rustc_has_incoherent_inherent_impls")
+            .exists();
 
         let enum_ = &item_tree[loc.id.value];
         let mut variants = Arena::new();
@@ -271,6 +301,7 @@ impl EnumData {
                 variants,
                 repr,
                 visibility: item_tree[enum_.visibility].clone(),
+                rustc_has_incoherent_inherent_impls,
             }),
             diagnostics.into(),
         )
@@ -281,10 +312,10 @@ impl EnumData {
         Some(id)
     }
 
-    pub fn variant_body_type(&self) -> Either<BuiltinInt, BuiltinUint> {
+    pub fn variant_body_type(&self) -> IntegerType {
         match self.repr {
-            Some(ReprData { kind: ReprKind::BuiltinInt { builtin, .. }, .. }) => builtin,
-            _ => Either::Left(BuiltinInt::Isize),
+            Some(ReprOptions { int: Some(builtin), .. }) => builtin,
+            _ => IntegerType::Pointer(true),
         }
     }
 }
diff --git a/crates/hir-def/src/attr.rs b/crates/hir-def/src/attr.rs
index 2b39c6f8da..ab5d180e1b 100644
--- a/crates/hir-def/src/attr.rs
+++ b/crates/hir-def/src/attr.rs
@@ -712,7 +712,7 @@ impl AttrSourceMap {
         self.source
             .get(ast_idx)
             .map(|it| InFile::new(file_id, it))
-            .unwrap_or_else(|| panic!("cannot find attr at index {:?}", id))
+            .unwrap_or_else(|| panic!("cannot find attr at index {id:?}"))
     }
 }
 
diff --git a/crates/hir-def/src/body.rs b/crates/hir-def/src/body.rs
index 759f3b8c04..78fbaa9d7d 100644
--- a/crates/hir-def/src/body.rs
+++ b/crates/hir-def/src/body.rs
@@ -372,7 +372,7 @@ impl Body {
     /// Retrieves all ident patterns this pattern shares the ident with.
     pub fn ident_patterns_for<'slf>(&'slf self, pat: &'slf PatId) -> &'slf [PatId] {
         match self.or_pats.get(pat) {
-            Some(pats) => &**pats,
+            Some(pats) => pats,
             None => std::slice::from_ref(pat),
         }
     }
diff --git a/crates/hir-def/src/body/lower.rs b/crates/hir-def/src/body/lower.rs
index ccc01c3efc..e8da24e3ad 100644
--- a/crates/hir-def/src/body/lower.rs
+++ b/crates/hir-def/src/body/lower.rs
@@ -371,6 +371,10 @@ impl ExprCollector<'_> {
                 let expr = e.expr().map(|e| self.collect_expr(e));
                 self.alloc_expr(Expr::Yield { expr }, syntax_ptr)
             }
+            ast::Expr::YeetExpr(e) => {
+                let expr = e.expr().map(|e| self.collect_expr(e));
+                self.alloc_expr(Expr::Yeet { expr }, syntax_ptr)
+            }
             ast::Expr::RecordExpr(e) => {
                 let path =
                     e.path().and_then(|path| self.expander.parse_path(self.db, path)).map(Box::new);
diff --git a/crates/hir-def/src/body/pretty.rs b/crates/hir-def/src/body/pretty.rs
index 162d173d52..10b9b26bbe 100644
--- a/crates/hir-def/src/body/pretty.rs
+++ b/crates/hir-def/src/body/pretty.rs
@@ -32,7 +32,7 @@ pub(super) fn print_body_hir(db: &dyn DefDatabase, body: &Body, owner: DefWithBo
                 Some(name) => name.to_string(),
                 None => "_".to_string(),
             };
-            format!("const {} = ", name)
+            format!("const {name} = ")
         }
         DefWithBodyId::VariantId(it) => {
             needs_semi = false;
@@ -42,7 +42,7 @@ pub(super) fn print_body_hir(db: &dyn DefDatabase, body: &Body, owner: DefWithBo
                 Some(name) => name.to_string(),
                 None => "_".to_string(),
             };
-            format!("{}", name)
+            format!("{name}")
         }
     };
 
@@ -247,6 +247,15 @@ impl<'a> Printer<'a> {
                     self.print_expr(*expr);
                 }
             }
+            Expr::Yeet { expr } => {
+                w!(self, "do");
+                self.whitespace();
+                w!(self, "yeet");
+                if let Some(expr) = expr {
+                    self.whitespace();
+                    self.print_expr(*expr);
+                }
+            }
             Expr::RecordLit { path, fields, spread, ellipsis, is_assignee_expr: _ } => {
                 match path {
                     Some(path) => self.print_path(path),
diff --git a/crates/hir-def/src/body/scope.rs b/crates/hir-def/src/body/scope.rs
index 45f64ebb06..2617d4288a 100644
--- a/crates/hir-def/src/body/scope.rs
+++ b/crates/hir-def/src/body/scope.rs
@@ -47,7 +47,7 @@ pub struct ScopeData {
 impl ExprScopes {
     pub(crate) fn expr_scopes_query(db: &dyn DefDatabase, def: DefWithBodyId) -> Arc<ExprScopes> {
         let body = db.body(def);
-        let mut scopes = ExprScopes::new(&*body);
+        let mut scopes = ExprScopes::new(&body);
         scopes.shrink_to_fit();
         Arc::new(scopes)
     }
diff --git a/crates/hir-def/src/builtin_attr.rs b/crates/hir-def/src/builtin_attr.rs
index 39581b33a8..f7c1e683d0 100644
--- a/crates/hir-def/src/builtin_attr.rs
+++ b/crates/hir-def/src/builtin_attr.rs
@@ -350,6 +350,7 @@ pub const INERT_ATTRIBUTES: &[BuiltinAttribute] = &[
     ),
     ungated!(rustc_const_unstable, Normal, template!(List: r#"feature = "name""#), DuplicatesOk),
     ungated!(rustc_const_stable, Normal, template!(List: r#"feature = "name""#), DuplicatesOk),
+    ungated!(rustc_safe_intrinsic, Normal, template!(List: r#"feature = "name""#), DuplicatesOk),
     gated!(
         allow_internal_unstable, Normal, template!(Word, List: "feat1, feat2, ..."), DuplicatesOk,
         "allow_internal_unstable side-steps feature gating and stability checks",
diff --git a/crates/hir-def/src/data.rs b/crates/hir-def/src/data.rs
index 9c76969086..e6b05f27a5 100644
--- a/crates/hir-def/src/data.rs
+++ b/crates/hir-def/src/data.rs
@@ -13,7 +13,9 @@ use crate::{
     intern::Interned,
     item_tree::{self, AssocItem, FnFlags, ItemTree, ItemTreeId, ModItem, Param, TreeId},
     nameres::{
-        attr_resolution::ResolvedAttr, diagnostics::DefDiagnostic, proc_macro::ProcMacroKind,
+        attr_resolution::ResolvedAttr,
+        diagnostics::DefDiagnostic,
+        proc_macro::{parse_macro_name_and_helper_attrs, ProcMacroKind},
         DefMap,
     },
     type_ref::{TraitRef, TypeBound, TypeRef},
@@ -168,6 +170,7 @@ pub struct TypeAliasData {
     pub type_ref: Option<Interned<TypeRef>>,
     pub visibility: RawVisibility,
     pub is_extern: bool,
+    pub rustc_has_incoherent_inherent_impls: bool,
     /// Bounds restricting the type alias itself (eg. `type Ty: Bound;` in a trait or impl).
     pub bounds: Vec<Interned<TypeBound>>,
 }
@@ -186,11 +189,17 @@ impl TypeAliasData {
             item_tree[typ.visibility].clone()
         };
 
+        let rustc_has_incoherent_inherent_impls = item_tree
+            .attrs(db, loc.container.module(db).krate(), ModItem::from(loc.id.value).into())
+            .by_key("rustc_has_incoherent_inherent_impls")
+            .exists();
+
         Arc::new(TypeAliasData {
             name: typ.name.clone(),
             type_ref: typ.type_ref.clone(),
             visibility,
             is_extern: matches!(loc.container, ItemContainerId::ExternBlockId(_)),
+            rustc_has_incoherent_inherent_impls,
             bounds: typ.bounds.to_vec(),
         })
     }
@@ -202,6 +211,7 @@ pub struct TraitData {
     pub items: Vec<(Name, AssocItemId)>,
     pub is_auto: bool,
     pub is_unsafe: bool,
+    pub rustc_has_incoherent_inherent_impls: bool,
     pub visibility: RawVisibility,
     /// Whether the trait has `#[rust_skip_array_during_method_dispatch]`. `hir_ty` will ignore
     /// method calls to this trait's methods when the receiver is an array and the crate edition is
@@ -224,18 +234,17 @@ impl TraitData {
         let item_tree = tree_id.item_tree(db);
         let tr_def = &item_tree[tree_id.value];
         let _cx = stdx::panic_context::enter(format!(
-            "trait_data_query({:?} -> {:?} -> {:?})",
-            tr, tr_loc, tr_def
+            "trait_data_query({tr:?} -> {tr_loc:?} -> {tr_def:?})"
         ));
         let name = tr_def.name.clone();
         let is_auto = tr_def.is_auto;
         let is_unsafe = tr_def.is_unsafe;
         let visibility = item_tree[tr_def.visibility].clone();
-        let skip_array_during_method_dispatch = item_tree
-            .attrs(db, module_id.krate(), ModItem::from(tree_id.value).into())
-            .by_key("rustc_skip_array_during_method_dispatch")
-            .exists();
-
+        let attrs = item_tree.attrs(db, module_id.krate(), ModItem::from(tree_id.value).into());
+        let skip_array_during_method_dispatch =
+            attrs.by_key("rustc_skip_array_during_method_dispatch").exists();
+        let rustc_has_incoherent_inherent_impls =
+            attrs.by_key("rustc_has_incoherent_inherent_impls").exists();
         let (items, attribute_calls, diagnostics) = match &tr_def.items {
             Some(items) => {
                 let mut collector = AssocItemCollector::new(
@@ -258,6 +267,7 @@ impl TraitData {
                 is_unsafe,
                 visibility,
                 skip_array_during_method_dispatch,
+                rustc_has_incoherent_inherent_impls,
             }),
             diagnostics.into(),
         )
@@ -339,6 +349,10 @@ impl ImplData {
 pub struct Macro2Data {
     pub name: Name,
     pub visibility: RawVisibility,
+    // It's a bit wasteful as currently this is only for builtin `Default` derive macro, but macro2
+    // are rarely used in practice so I think it's okay for now.
+    /// Derive helpers, if this is a derive rustc_builtin_macro
+    pub helpers: Option<Box<[Name]>>,
 }
 
 impl Macro2Data {
@@ -347,9 +361,18 @@ impl Macro2Data {
         let item_tree = loc.id.item_tree(db);
         let makro = &item_tree[loc.id.value];
 
+        let helpers = item_tree
+            .attrs(db, loc.container.krate(), ModItem::from(loc.id.value).into())
+            .by_key("rustc_builtin_macro")
+            .tt_values()
+            .next()
+            .and_then(|attr| parse_macro_name_and_helper_attrs(&attr.token_trees))
+            .map(|(_, helpers)| helpers);
+
         Arc::new(Macro2Data {
             name: makro.name.clone(),
             visibility: item_tree[makro.visibility].clone(),
+            helpers,
         })
     }
 }
@@ -519,7 +542,7 @@ impl<'a> AssocItemCollector<'a> {
             if !attrs.is_cfg_enabled(self.expander.cfg_options()) {
                 self.inactive_diagnostics.push(DefDiagnostic::unconfigured_code(
                     self.module_id.local_id,
-                    InFile::new(self.expander.current_file_id(), item.ast_id(&item_tree).upcast()),
+                    InFile::new(self.expander.current_file_id(), item.ast_id(item_tree).upcast()),
                     attrs.cfg().unwrap(),
                     self.expander.cfg_options().clone(),
                 ));
@@ -528,7 +551,7 @@ impl<'a> AssocItemCollector<'a> {
 
             'attrs: for attr in &*attrs {
                 let ast_id =
-                    AstId::new(self.expander.current_file_id(), item.ast_id(&item_tree).upcast());
+                    AstId::new(self.expander.current_file_id(), item.ast_id(item_tree).upcast());
                 let ast_id_with_path = AstIdWithPath { path: (*attr.path).clone(), ast_id };
 
                 if let Ok(ResolvedAttr::Macro(call_id)) = self.def_map.resolve_attr_macro(
@@ -595,10 +618,8 @@ impl<'a> AssocItemCollector<'a> {
 
                         let ast_id_map = self.db.ast_id_map(self.expander.current_file_id());
                         let call = ast_id_map.get(call.ast_id).to_node(&root);
-                        let _cx = stdx::panic_context::enter(format!(
-                            "collect_items MacroCall: {}",
-                            call
-                        ));
+                        let _cx =
+                            stdx::panic_context::enter(format!("collect_items MacroCall: {call}"));
                         let res = self.expander.enter_expand::<ast::MacroItems>(self.db, call);
 
                         if let Ok(ExpandResult { value: Some((mark, _)), .. }) = res {
diff --git a/crates/hir-def/src/expr.rs b/crates/hir-def/src/expr.rs
index 1626465502..7b65694211 100644
--- a/crates/hir-def/src/expr.rs
+++ b/crates/hir-def/src/expr.rs
@@ -36,6 +36,13 @@ pub(crate) fn dummy_expr_id() -> ExprId {
 
 pub type PatId = Idx<Pat>;
 
+#[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
+pub enum ExprOrPatId {
+    ExprId(ExprId),
+    PatId(PatId),
+}
+stdx::impl_from!(ExprId, PatId for ExprOrPatId);
+
 #[derive(Debug, Clone, Eq, PartialEq)]
 pub struct Label {
     pub name: Name,
@@ -137,6 +144,9 @@ pub enum Expr {
     Yield {
         expr: Option<ExprId>,
     },
+    Yeet {
+        expr: Option<ExprId>,
+    },
     RecordLit {
         path: Option<Box<Path>>,
         fields: Box<[RecordLitField]>,
@@ -313,7 +323,10 @@ impl Expr {
                 arms.iter().map(|arm| arm.expr).for_each(f);
             }
             Expr::Continue { .. } => {}
-            Expr::Break { expr, .. } | Expr::Return { expr } | Expr::Yield { expr } => {
+            Expr::Break { expr, .. }
+            | Expr::Return { expr }
+            | Expr::Yield { expr }
+            | Expr::Yeet { expr } => {
                 if let &Some(expr) = expr {
                     f(expr);
                 }
diff --git a/crates/hir-def/src/find_path.rs b/crates/hir-def/src/find_path.rs
index c70e6fdccd..ddd7ad99e9 100644
--- a/crates/hir-def/src/find_path.rs
+++ b/crates/hir-def/src/find_path.rs
@@ -107,7 +107,7 @@ fn find_path_inner(
     }
 
     // - if the item is in the prelude, return the name from there
-    if let Some(value) = find_in_prelude(db, &crate_root.def_map(db), item, from) {
+    if let value @ Some(_) = find_in_prelude(db, &crate_root.def_map(db), &def_map, item, from) {
         return value;
     }
 
@@ -176,7 +176,7 @@ fn find_path_for_module(
 
     // - if relative paths are fine, check if we are searching for a parent
     if prefixed.filter(PrefixKind::is_absolute).is_none() {
-        if let modpath @ Some(_) = find_self_super(&def_map, module_id, from) {
+        if let modpath @ Some(_) = find_self_super(def_map, module_id, from) {
             return modpath;
         }
     }
@@ -205,7 +205,8 @@ fn find_path_for_module(
         }
     }
 
-    if let Some(value) = find_in_prelude(db, &root_def_map, ItemInNs::Types(module_id.into()), from)
+    if let value @ Some(_) =
+        find_in_prelude(db, &root_def_map, &def_map, ItemInNs::Types(module_id.into()), from)
     {
         return value;
     }
@@ -234,23 +235,41 @@ fn find_in_scope(
     })
 }
 
+/// Returns single-segment path (i.e. without any prefix) if `item` is found in prelude and its
+/// name doesn't clash in current scope.
 fn find_in_prelude(
     db: &dyn DefDatabase,
     root_def_map: &DefMap,
+    local_def_map: &DefMap,
     item: ItemInNs,
     from: ModuleId,
-) -> Option<Option<ModPath>> {
-    if let Some(prelude_module) = root_def_map.prelude() {
-        // Preludes in block DefMaps are ignored, only the crate DefMap is searched
-        let prelude_def_map = prelude_module.def_map(db);
-        let prelude_scope = &prelude_def_map[prelude_module.local_id].scope;
-        if let Some((name, vis)) = prelude_scope.name_of(item) {
-            if vis.is_visible_from(db, from) {
-                return Some(Some(ModPath::from_segments(PathKind::Plain, Some(name.clone()))));
-            }
-        }
+) -> Option<ModPath> {
+    let prelude_module = root_def_map.prelude()?;
+    // Preludes in block DefMaps are ignored, only the crate DefMap is searched
+    let prelude_def_map = prelude_module.def_map(db);
+    let prelude_scope = &prelude_def_map[prelude_module.local_id].scope;
+    let (name, vis) = prelude_scope.name_of(item)?;
+    if !vis.is_visible_from(db, from) {
+        return None;
+    }
+
+    // Check if the name is in current scope and it points to the same def.
+    let found_and_same_def =
+        local_def_map.with_ancestor_maps(db, from.local_id, &mut |def_map, local_id| {
+            let per_ns = def_map[local_id].scope.get(name);
+            let same_def = match item {
+                ItemInNs::Types(it) => per_ns.take_types()? == it,
+                ItemInNs::Values(it) => per_ns.take_values()? == it,
+                ItemInNs::Macros(it) => per_ns.take_macros()? == it,
+            };
+            Some(same_def)
+        });
+
+    if found_and_same_def.unwrap_or(true) {
+        Some(ModPath::from_segments(PathKind::Plain, Some(name.clone())))
+    } else {
+        None
     }
-    None
 }
 
 fn find_self_super(def_map: &DefMap, item: ModuleId, from: ModuleId) -> Option<ModPath> {
@@ -512,7 +531,7 @@ mod tests {
     fn check_found_path_(ra_fixture: &str, path: &str, prefix_kind: Option<PrefixKind>) {
         let (db, pos) = TestDB::with_position(ra_fixture);
         let module = db.module_at_position(pos);
-        let parsed_path_file = syntax::SourceFile::parse(&format!("use {};", path));
+        let parsed_path_file = syntax::SourceFile::parse(&format!("use {path};"));
         let ast_path =
             parsed_path_file.syntax_node().descendants().find_map(syntax::ast::Path::cast).unwrap();
         let mod_path = ModPath::from_src(&db, ast_path, &Hygiene::new_unhygienic()).unwrap();
@@ -531,7 +550,7 @@ mod tests {
 
         let found_path =
             find_path_inner(&db, ItemInNs::Types(resolved), module, prefix_kind, false);
-        assert_eq!(found_path, Some(mod_path), "{:?}", prefix_kind);
+        assert_eq!(found_path, Some(mod_path), "{prefix_kind:?}");
     }
 
     fn check_found_path(
@@ -808,6 +827,48 @@ pub mod prelude {
         );
     }
 
+    #[test]
+    fn shadowed_prelude() {
+        check_found_path(
+            r#"
+//- /main.rs crate:main deps:std
+struct S;
+$0
+//- /std.rs crate:std
+pub mod prelude {
+    pub mod rust_2018 {
+        pub struct S;
+    }
+}
+"#,
+            "std::prelude::rust_2018::S",
+            "std::prelude::rust_2018::S",
+            "std::prelude::rust_2018::S",
+            "std::prelude::rust_2018::S",
+        );
+    }
+
+    #[test]
+    fn imported_prelude() {
+        check_found_path(
+            r#"
+//- /main.rs crate:main deps:std
+use S;
+$0
+//- /std.rs crate:std
+pub mod prelude {
+    pub mod rust_2018 {
+        pub struct S;
+    }
+}
+"#,
+            "S",
+            "S",
+            "S",
+            "S",
+        );
+    }
+
     #[test]
     fn enum_variant_from_prelude() {
         let code = r#"
diff --git a/crates/hir-def/src/generics.rs b/crates/hir-def/src/generics.rs
index 469b28c2d9..f74559f5d6 100644
--- a/crates/hir-def/src/generics.rs
+++ b/crates/hir-def/src/generics.rs
@@ -142,8 +142,8 @@ pub enum WherePredicateTypeTarget {
 
 impl GenericParams {
     /// Iterator of type_or_consts field
-    pub fn iter<'a>(
-        &'a self,
+    pub fn iter(
+        &self,
     ) -> impl DoubleEndedIterator<Item = (Idx<TypeOrConstParamData>, &TypeOrConstParamData)> {
         self.type_or_consts.iter()
     }
diff --git a/crates/hir-def/src/import_map.rs b/crates/hir-def/src/import_map.rs
index 688055e430..1ce191942e 100644
--- a/crates/hir-def/src/import_map.rs
+++ b/crates/hir-def/src/import_map.rs
@@ -239,7 +239,7 @@ impl fmt::Debug for ImportMap {
                     ItemInNs::Values(_) => "v",
                     ItemInNs::Macros(_) => "m",
                 };
-                format!("- {} ({})", info.path, ns)
+                format!("- {} ({ns})", info.path)
             })
             .collect();
 
@@ -389,12 +389,12 @@ impl Query {
 /// Searches dependencies of `krate` for an importable path matching `query`.
 ///
 /// This returns a list of items that could be imported from dependencies of `krate`.
-pub fn search_dependencies<'a>(
-    db: &'a dyn DefDatabase,
+pub fn search_dependencies(
+    db: &dyn DefDatabase,
     krate: CrateId,
     query: Query,
 ) -> FxHashSet<ItemInNs> {
-    let _p = profile::span("search_dependencies").detail(|| format!("{:?}", query));
+    let _p = profile::span("search_dependencies").detail(|| format!("{query:?}"));
 
     let graph = db.crate_graph();
     let import_maps: Vec<_> =
@@ -545,7 +545,7 @@ mod tests {
                         None
                     }
                 })?;
-            return Some(format!("{}::{}", dependency_imports.path_of(trait_)?, assoc_item_name));
+            return Some(format!("{}::{assoc_item_name}", dependency_imports.path_of(trait_)?));
         }
         None
     }
@@ -585,7 +585,7 @@ mod tests {
 
                 let map = db.import_map(krate);
 
-                Some(format!("{}:\n{:?}\n", name, map))
+                Some(format!("{name}:\n{map:?}\n"))
             })
             .sorted()
             .collect::<String>();
diff --git a/crates/hir-def/src/item_scope.rs b/crates/hir-def/src/item_scope.rs
index 7721221c44..c7b213b7e9 100644
--- a/crates/hir-def/src/item_scope.rs
+++ b/crates/hir-def/src/item_scope.rs
@@ -96,7 +96,7 @@ pub(crate) enum BuiltinShadowMode {
 /// Legacy macros can only be accessed through special methods like `get_legacy_macros`.
 /// Other methods will only resolve values, types and module scoped macros only.
 impl ItemScope {
-    pub fn entries<'a>(&'a self) -> impl Iterator<Item = (&'a Name, PerNs)> + 'a {
+    pub fn entries(&self) -> impl Iterator<Item = (&Name, PerNs)> + '_ {
         // FIXME: shadowing
         self.types
             .keys()
@@ -159,18 +159,17 @@ impl ItemScope {
     pub(crate) fn name_of(&self, item: ItemInNs) -> Option<(&Name, Visibility)> {
         let (def, mut iter) = match item {
             ItemInNs::Macros(def) => {
-                return self
-                    .macros
-                    .iter()
-                    .find_map(|(name, &(other_def, vis))| (other_def == def).then(|| (name, vis)));
+                return self.macros.iter().find_map(|(name, &(other_def, vis))| {
+                    (other_def == def).then_some((name, vis))
+                });
             }
             ItemInNs::Types(def) => (def, self.types.iter()),
             ItemInNs::Values(def) => (def, self.values.iter()),
         };
-        iter.find_map(|(name, &(other_def, vis))| (other_def == def).then(|| (name, vis)))
+        iter.find_map(|(name, &(other_def, vis))| (other_def == def).then_some((name, vis)))
     }
 
-    pub(crate) fn traits<'a>(&'a self) -> impl Iterator<Item = TraitId> + 'a {
+    pub(crate) fn traits(&self) -> impl Iterator<Item = TraitId> + '_ {
         self.types
             .values()
             .filter_map(|&(def, _)| match def {
@@ -327,7 +326,7 @@ impl ItemScope {
         changed
     }
 
-    pub(crate) fn resolutions<'a>(&'a self) -> impl Iterator<Item = (Option<Name>, PerNs)> + 'a {
+    pub(crate) fn resolutions(&self) -> impl Iterator<Item = (Option<Name>, PerNs)> + '_ {
         self.entries().map(|(name, res)| (Some(name.clone()), res)).chain(
             self.unnamed_trait_imports
                 .iter()
diff --git a/crates/hir-def/src/item_tree.rs b/crates/hir-def/src/item_tree.rs
index 0aa531eff7..80297f8adf 100644
--- a/crates/hir-def/src/item_tree.rs
+++ b/crates/hir-def/src/item_tree.rs
@@ -105,7 +105,7 @@ pub struct ItemTree {
 
 impl ItemTree {
     pub(crate) fn file_item_tree_query(db: &dyn DefDatabase, file_id: HirFileId) -> Arc<ItemTree> {
-        let _p = profile::span("file_item_tree_query").detail(|| format!("{:?}", file_id));
+        let _p = profile::span("file_item_tree_query").detail(|| format!("{file_id:?}"));
         let syntax = match db.parse_or_expand(file_id) {
             Some(node) => node,
             None => return Default::default(),
@@ -132,7 +132,7 @@ impl ItemTree {
                     ctx.lower_macro_stmts(stmts)
                 },
                 _ => {
-                    panic!("cannot create item tree from {:?} {}", syntax, syntax);
+                    panic!("cannot create item tree from {syntax:?} {syntax}");
                 },
             }
         };
diff --git a/crates/hir-def/src/layout.rs b/crates/hir-def/src/layout.rs
new file mode 100644
index 0000000000..6bb4cd94f8
--- /dev/null
+++ b/crates/hir-def/src/layout.rs
@@ -0,0 +1,96 @@
+//! Definitions needed for computing data layout of types.
+
+use std::cmp;
+
+use la_arena::{Idx, RawIdx};
+pub use rustc_abi::{
+    Abi, AbiAndPrefAlign, AddressSpace, Align, Endian, FieldsShape, Integer, IntegerType,
+    LayoutCalculator, Niche, Primitive, ReprFlags, ReprOptions, Scalar, Size, StructKind,
+    TargetDataLayout, TargetDataLayoutErrors, WrappingRange,
+};
+
+use crate::LocalEnumVariantId;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub struct RustcEnumVariantIdx(pub LocalEnumVariantId);
+
+impl rustc_index::vec::Idx for RustcEnumVariantIdx {
+    fn new(idx: usize) -> Self {
+        RustcEnumVariantIdx(Idx::from_raw(RawIdx::from(idx as u32)))
+    }
+
+    fn index(self) -> usize {
+        u32::from(self.0.into_raw()) as usize
+    }
+}
+
+pub type Layout = rustc_abi::LayoutS<RustcEnumVariantIdx>;
+pub type TagEncoding = rustc_abi::TagEncoding<RustcEnumVariantIdx>;
+pub type Variants = rustc_abi::Variants<RustcEnumVariantIdx>;
+
+pub trait IntegerExt {
+    fn repr_discr(
+        dl: &TargetDataLayout,
+        repr: &ReprOptions,
+        min: i128,
+        max: i128,
+    ) -> Result<(Integer, bool), LayoutError>;
+}
+
+impl IntegerExt for Integer {
+    /// Finds the appropriate Integer type and signedness for the given
+    /// signed discriminant range and `#[repr]` attribute.
+    /// N.B.: `u128` values above `i128::MAX` will be treated as signed, but
+    /// that shouldn't affect anything, other than maybe debuginfo.
+    fn repr_discr(
+        dl: &TargetDataLayout,
+        repr: &ReprOptions,
+        min: i128,
+        max: i128,
+    ) -> Result<(Integer, bool), LayoutError> {
+        // Theoretically, negative values could be larger in unsigned representation
+        // than the unsigned representation of the signed minimum. However, if there
+        // are any negative values, the only valid unsigned representation is u128
+        // which can fit all i128 values, so the result remains unaffected.
+        let unsigned_fit = Integer::fit_unsigned(cmp::max(min as u128, max as u128));
+        let signed_fit = cmp::max(Integer::fit_signed(min), Integer::fit_signed(max));
+
+        if let Some(ity) = repr.int {
+            let discr = Integer::from_attr(dl, ity);
+            let fit = if ity.is_signed() { signed_fit } else { unsigned_fit };
+            if discr < fit {
+                return Err(LayoutError::UserError(
+                    "Integer::repr_discr: `#[repr]` hint too small for \
+                      discriminant range of enum "
+                        .to_string(),
+                ));
+            }
+            return Ok((discr, ity.is_signed()));
+        }
+
+        let at_least = if repr.c() {
+            // This is usually I32, however it can be different on some platforms,
+            // notably hexagon and arm-none/thumb-none
+            dl.c_enum_min_size
+        } else {
+            // repr(Rust) enums try to be as small as possible
+            Integer::I8
+        };
+
+        // If there are no negative values, we can use the unsigned fit.
+        Ok(if min >= 0 {
+            (cmp::max(unsigned_fit, at_least), false)
+        } else {
+            (cmp::max(signed_fit, at_least), true)
+        })
+    }
+}
+
+#[derive(Debug, PartialEq, Eq, Clone)]
+pub enum LayoutError {
+    UserError(String),
+    SizeOverflow,
+    HasPlaceholder,
+    NotImplemented,
+    Unknown,
+}
diff --git a/crates/hir-def/src/lib.rs b/crates/hir-def/src/lib.rs
index 5c7aa72349..8267ef09cb 100644
--- a/crates/hir-def/src/lib.rs
+++ b/crates/hir-def/src/lib.rs
@@ -34,6 +34,7 @@ pub mod adt;
 pub mod data;
 pub mod generics;
 pub mod lang_item;
+pub mod layout;
 
 pub mod expr;
 pub mod body;
diff --git a/crates/hir-def/src/macro_expansion_tests.rs b/crates/hir-def/src/macro_expansion_tests.rs
index 81b9c5c4bf..79c85d1183 100644
--- a/crates/hir-def/src/macro_expansion_tests.rs
+++ b/crates/hir-def/src/macro_expansion_tests.rs
@@ -170,7 +170,7 @@ pub fn identity_when_valid(_attr: TokenStream, item: TokenStream) -> TokenStream
             }
             let pp = pretty_print_macro_expansion(
                 parse.syntax_node(),
-                show_token_ids.then(|| &*token_map),
+                show_token_ids.then_some(&*token_map),
             );
             let indent = IndentLevel::from_node(call.syntax());
             let pp = reindent(indent, pp);
@@ -179,7 +179,7 @@ pub fn identity_when_valid(_attr: TokenStream, item: TokenStream) -> TokenStream
             if tree {
                 let tree = format!("{:#?}", parse.syntax_node())
                     .split_inclusive('\n')
-                    .map(|line| format!("// {}", line))
+                    .map(|line| format!("// {line}"))
                     .collect::<String>();
                 format_to!(expn_text, "\n{}", tree)
             }
diff --git a/crates/hir-def/src/macro_expansion_tests/builtin_fn_macro.rs b/crates/hir-def/src/macro_expansion_tests/builtin_fn_macro.rs
index c04cd16519..bb45266725 100644
--- a/crates/hir-def/src/macro_expansion_tests/builtin_fn_macro.rs
+++ b/crates/hir-def/src/macro_expansion_tests/builtin_fn_macro.rs
@@ -163,7 +163,8 @@ macro_rules! compile_error {
 }
 
 // This expands to nothing (since it's in item position), but emits an error.
-compile_error!("error!");
+compile_error!("error, with an escaped quote: \"");
+compile_error!(r"this is a raw string");
 "#,
         expect![[r##"
 #[rustc_builtin_macro]
@@ -172,7 +173,8 @@ macro_rules! compile_error {
     ($msg:expr,) => ({ /* compiler built-in */ })
 }
 
-/* error: error! */
+/* error: error, with an escaped quote: " */
+/* error: this is a raw string */
 "##]],
     );
 }
diff --git a/crates/hir-def/src/macro_expansion_tests/mbe.rs b/crates/hir-def/src/macro_expansion_tests/mbe.rs
index 457e43925c..2d5f2a692e 100644
--- a/crates/hir-def/src/macro_expansion_tests/mbe.rs
+++ b/crates/hir-def/src/macro_expansion_tests/mbe.rs
@@ -1630,3 +1630,48 @@ const _: i32 = -0--1--2;
     "#]],
     );
 }
+
+#[test]
+fn test_punct_without_space() {
+    // Puncts are "glued" greedily.
+    check(
+        r#"
+macro_rules! foo {
+    (: : :) => { "1 1 1" };
+    (: ::) => { "1 2" };
+    (:: :) => { "2 1" };
+
+    (: : : :) => { "1 1 1 1" };
+    (:: : :) => { "2 1 1" };
+    (: :: :) => { "1 2 1" };
+    (: : ::) => { "1 1 2" };
+    (:: ::) => { "2 2" };
+}
+
+fn test() {
+    foo!(:::);
+    foo!(: :::);
+    foo!(::::);
+}
+"#,
+        expect![[r#"
+macro_rules! foo {
+    (: : :) => { "1 1 1" };
+    (: ::) => { "1 2" };
+    (:: :) => { "2 1" };
+
+    (: : : :) => { "1 1 1 1" };
+    (:: : :) => { "2 1 1" };
+    (: :: :) => { "1 2 1" };
+    (: : ::) => { "1 1 2" };
+    (:: ::) => { "2 2" };
+}
+
+fn test() {
+    "2 1";
+    "1 2 1";
+    "2 2";
+}
+"#]],
+    );
+}
diff --git a/crates/hir-def/src/macro_expansion_tests/mbe/matching.rs b/crates/hir-def/src/macro_expansion_tests/mbe/matching.rs
index fc90c6e9f3..26f16542cb 100644
--- a/crates/hir-def/src/macro_expansion_tests/mbe/matching.rs
+++ b/crates/hir-def/src/macro_expansion_tests/mbe/matching.rs
@@ -136,3 +136,52 @@ macro_rules! m { ($($i:ident)? $vis:vis) => () }
 "#]],
     )
 }
+
+// For this test and the one below, see rust-lang/rust#86730.
+#[test]
+fn expr_dont_match_let_expr() {
+    check(
+        r#"
+macro_rules! foo {
+    ($e:expr) => { $e }
+}
+
+fn test() {
+    foo!(let a = 3);
+}
+"#,
+        expect![[r#"
+macro_rules! foo {
+    ($e:expr) => { $e }
+}
+
+fn test() {
+    /* error: no rule matches input tokens */missing;
+}
+"#]],
+    );
+}
+
+#[test]
+fn expr_dont_match_inline_const() {
+    check(
+        r#"
+macro_rules! foo {
+    ($e:expr) => { $e }
+}
+
+fn test() {
+    foo!(const { 3 });
+}
+"#,
+        expect![[r#"
+macro_rules! foo {
+    ($e:expr) => { $e }
+}
+
+fn test() {
+    /* error: no rule matches input tokens */missing;
+}
+"#]],
+    );
+}
diff --git a/crates/hir-def/src/nameres.rs b/crates/hir-def/src/nameres.rs
index 9b4ce9f97c..f42b0079d7 100644
--- a/crates/hir-def/src/nameres.rs
+++ b/crates/hir-def/src/nameres.rs
@@ -457,7 +457,7 @@ impl DefMap {
             for (name, child) in
                 map.modules[module].children.iter().sorted_by(|a, b| Ord::cmp(&a.0, &b.0))
             {
-                let path = format!("{}::{}", path, name);
+                let path = format!("{path}::{name}");
                 buf.push('\n');
                 go(buf, map, &path, *child);
             }
diff --git a/crates/hir-def/src/nameres/collector.rs b/crates/hir-def/src/nameres/collector.rs
index b0dd01f9db..160203b778 100644
--- a/crates/hir-def/src/nameres/collector.rs
+++ b/crates/hir-def/src/nameres/collector.rs
@@ -40,7 +40,7 @@ use crate::{
         diagnostics::DefDiagnostic,
         mod_resolution::ModDir,
         path_resolution::ReachedFixedPoint,
-        proc_macro::{ProcMacroDef, ProcMacroKind},
+        proc_macro::{parse_macro_name_and_helper_attrs, ProcMacroDef, ProcMacroKind},
         BuiltinShadowMode, DefMap, ModuleData, ModuleOrigin, ResolveMode,
     },
     path::{ImportAlias, ModPath, PathKind},
@@ -67,7 +67,7 @@ pub(super) fn collect_defs(db: &dyn DefDatabase, mut def_map: DefMap, tree_id: T
         let dep_def_map = db.crate_def_map(dep.crate_id);
         let dep_root = dep_def_map.module_id(dep_def_map.root);
 
-        deps.insert(dep.as_name(), dep_root.into());
+        deps.insert(dep.as_name(), dep_root);
 
         if dep.is_prelude() && !tree_id.is_block() {
             def_map.extern_prelude.insert(dep.as_name(), dep_root);
@@ -1017,7 +1017,7 @@ impl DefCollector<'_> {
                         None => true,
                         Some(old_vis) => {
                             let max_vis = old_vis.max(vis, &self.def_map).unwrap_or_else(|| {
-                                panic!("`Tr as _` imports with unrelated visibilities {:?} and {:?} (trait {:?})", old_vis, vis, tr);
+                                panic!("`Tr as _` imports with unrelated visibilities {old_vis:?} and {vis:?} (trait {tr:?})");
                             });
 
                             if max_vis == old_vis {
@@ -1094,7 +1094,7 @@ impl DefCollector<'_> {
                         ast_id,
                         *expand_to,
                         self.def_map.krate,
-                        &resolver_def_id,
+                        resolver_def_id,
                         &mut |_err| (),
                     );
                     if let Ok(Ok(call_id)) = call_id {
@@ -1110,7 +1110,7 @@ impl DefCollector<'_> {
                         *derive_attr,
                         *derive_pos as u32,
                         self.def_map.krate,
-                        &resolver,
+                        resolver,
                     );
 
                     if let Ok((macro_id, def_id, call_id)) = id {
@@ -1345,7 +1345,7 @@ impl DefCollector<'_> {
                     // Missing proc macros are non-fatal, so they are handled specially.
                     DefDiagnostic::unresolved_proc_macro(module_id, loc.kind.clone(), loc.def.krate)
                 }
-                _ => DefDiagnostic::macro_error(module_id, loc.kind.clone(), err.to_string()),
+                _ => DefDiagnostic::macro_error(module_id, loc.kind, err.to_string()),
             };
 
             self.def_map.diagnostics.push(diag);
@@ -2005,6 +2005,7 @@ impl ModCollector<'_, '_> {
         let ast_id = InFile::new(self.file_id(), mac.ast_id.upcast());
 
         // Case 1: builtin macros
+        let mut helpers_opt = None;
         let attrs = self.item_tree.attrs(self.def_collector.db, krate, ModItem::from(id).into());
         let expander = if attrs.by_key("rustc_builtin_macro").exists() {
             if let Some(expander) = find_builtin_macro(&mac.name) {
@@ -2013,6 +2014,25 @@ impl ModCollector<'_, '_> {
                     Either::Right(it) => MacroExpander::BuiltInEager(it),
                 }
             } else if let Some(expander) = find_builtin_derive(&mac.name) {
+                if let Some(attr) = attrs.by_key("rustc_builtin_macro").tt_values().next() {
+                    // NOTE: The item *may* have both `#[rustc_builtin_macro]` and `#[proc_macro_derive]`,
+                    // in which case rustc ignores the helper attributes from the latter, but it
+                    // "doesn't make sense in practice" (see rust-lang/rust#87027).
+                    if let Some((name, helpers)) =
+                        parse_macro_name_and_helper_attrs(&attr.token_trees)
+                    {
+                        // NOTE: rustc overrides the name if the macro name if it's different from the
+                        // macro name, but we assume it isn't as there's no such case yet. FIXME if
+                        // the following assertion fails.
+                        stdx::always!(
+                            name == mac.name,
+                            "built-in macro {} has #[rustc_builtin_macro] which declares different name {}",
+                            mac.name,
+                            name
+                        );
+                        helpers_opt = Some(helpers);
+                    }
+                }
                 MacroExpander::BuiltInDerive(expander)
             } else if let Some(expander) = find_builtin_attr(&mac.name) {
                 MacroExpander::BuiltInAttr(expander)
@@ -2037,6 +2057,12 @@ impl ModCollector<'_, '_> {
             macro_id,
             &self.item_tree[mac.visibility],
         );
+        if let Some(helpers) = helpers_opt {
+            self.def_collector
+                .def_map
+                .exported_derives
+                .insert(macro_id_to_def_id(self.def_collector.db, macro_id.into()), helpers);
+        }
     }
 
     fn collect_macro_call(&mut self, mac: &MacroCall, container: ItemContainerId) {
@@ -2059,7 +2085,7 @@ impl ModCollector<'_, '_> {
                                 .scope
                                 .get_legacy_macro(name)
                                 .and_then(|it| it.last())
-                                .map(|&it| macro_id_to_def_id(self.def_collector.db, it.into()))
+                                .map(|&it| macro_id_to_def_id(self.def_collector.db, it))
                         },
                     )
                 })
diff --git a/crates/hir-def/src/nameres/mod_resolution.rs b/crates/hir-def/src/nameres/mod_resolution.rs
index ca7bcc814e..4c263846d2 100644
--- a/crates/hir-def/src/nameres/mod_resolution.rs
+++ b/crates/hir-def/src/nameres/mod_resolution.rs
@@ -34,7 +34,7 @@ impl ModDir {
         let path = match attr_path.map(SmolStr::as_str) {
             None => {
                 let mut path = self.dir_path.clone();
-                path.push(&name.to_smol_str());
+                path.push(&name.unescaped().to_smol_str());
                 path
             }
             Some(attr_path) => {
@@ -74,12 +74,12 @@ impl ModDir {
                 candidate_files.push(self.dir_path.join_attr(attr_path, self.root_non_dir_owner))
             }
             None if file_id.is_include_macro(db.upcast()) => {
-                candidate_files.push(format!("{}.rs", name));
-                candidate_files.push(format!("{}/mod.rs", name));
+                candidate_files.push(format!("{name}.rs"));
+                candidate_files.push(format!("{name}/mod.rs"));
             }
             None => {
-                candidate_files.push(format!("{}{}.rs", self.dir_path.0, name));
-                candidate_files.push(format!("{}{}/mod.rs", self.dir_path.0, name));
+                candidate_files.push(format!("{}{name}.rs", self.dir_path.0));
+                candidate_files.push(format!("{}{name}/mod.rs", self.dir_path.0));
             }
         };
 
@@ -91,7 +91,7 @@ impl ModDir {
                 let (dir_path, root_non_dir_owner) = if is_mod_rs || attr_path.is_some() {
                     (DirPath::empty(), false)
                 } else {
-                    (DirPath::new(format!("{}/", name)), true)
+                    (DirPath::new(format!("{name}/")), true)
                 };
                 if let Some(mod_dir) = self.child(dir_path, root_non_dir_owner) {
                     return Ok((file_id, is_mod_rs, mod_dir));
@@ -156,7 +156,7 @@ impl DirPath {
         } else {
             attr
         };
-        let res = format!("{}{}", base, attr);
+        let res = format!("{base}{attr}");
         res
     }
 }
diff --git a/crates/hir-def/src/nameres/path_resolution.rs b/crates/hir-def/src/nameres/path_resolution.rs
index 20d39ec6cb..1d9d5cccde 100644
--- a/crates/hir-def/src/nameres/path_resolution.rs
+++ b/crates/hir-def/src/nameres/path_resolution.rs
@@ -170,8 +170,8 @@ impl DefMap {
     ) -> ResolvePathResult {
         let graph = db.crate_graph();
         let _cx = stdx::panic_context::enter(format!(
-            "DefMap {:?} crate_name={:?} block={:?} path={}",
-            self.krate, graph[self.krate].display_name, self.block, path
+            "DefMap {:?} crate_name={:?} block={:?} path={path}",
+            self.krate, graph[self.krate].display_name, self.block
         ));
 
         let mut segments = path.segments().iter().enumerate();
@@ -390,7 +390,7 @@ impl DefMap {
             .get_legacy_macro(name)
             // FIXME: shadowing
             .and_then(|it| it.last())
-            .map_or_else(PerNs::none, |&m| PerNs::macros(m.into(), Visibility::Public));
+            .map_or_else(PerNs::none, |&m| PerNs::macros(m, Visibility::Public));
         let from_scope = self[module].scope.get(name);
         let from_builtin = match self.block {
             Some(_) => {
diff --git a/crates/hir-def/src/nameres/proc_macro.rs b/crates/hir-def/src/nameres/proc_macro.rs
index 52b79cd0fd..06b23392cf 100644
--- a/crates/hir-def/src/nameres/proc_macro.rs
+++ b/crates/hir-def/src/nameres/proc_macro.rs
@@ -37,45 +37,53 @@ impl Attrs {
             Some(ProcMacroDef { name: func_name.clone(), kind: ProcMacroKind::Attr })
         } else if self.by_key("proc_macro_derive").exists() {
             let derive = self.by_key("proc_macro_derive").tt_values().next()?;
+            let def = parse_macro_name_and_helper_attrs(&derive.token_trees)
+                .map(|(name, helpers)| ProcMacroDef { name, kind: ProcMacroKind::CustomDerive { helpers } });
 
-            match &*derive.token_trees {
-                // `#[proc_macro_derive(Trait)]`
-                [TokenTree::Leaf(Leaf::Ident(trait_name))] => Some(ProcMacroDef {
-                    name: trait_name.as_name(),
-                    kind: ProcMacroKind::CustomDerive { helpers: Box::new([]) },
-                }),
-
-                // `#[proc_macro_derive(Trait, attributes(helper1, helper2, ...))]`
-                [
-                    TokenTree::Leaf(Leaf::Ident(trait_name)),
-                    TokenTree::Leaf(Leaf::Punct(comma)),
-                    TokenTree::Leaf(Leaf::Ident(attributes)),
-                    TokenTree::Subtree(helpers)
-                ] if comma.char == ',' && attributes.text == "attributes" =>
-                {
-                    let helpers = helpers.token_trees.iter()
-                        .filter(|tt| !matches!(tt, TokenTree::Leaf(Leaf::Punct(comma)) if comma.char == ','))
-                        .map(|tt| {
-                            match tt {
-                                TokenTree::Leaf(Leaf::Ident(helper)) => Some(helper.as_name()),
-                                _ => None
-                            }
-                        })
-                        .collect::<Option<Box<[_]>>>()?;
-
-                    Some(ProcMacroDef {
-                        name: trait_name.as_name(),
-                        kind: ProcMacroKind::CustomDerive { helpers },
-                    })
-                }
-
-                _ => {
-                    tracing::trace!("malformed `#[proc_macro_derive]`: {}", derive);
-                    None
-                }
+            if def.is_none() {
+                tracing::trace!("malformed `#[proc_macro_derive]`: {}", derive);
             }
+
+            def
         } else {
             None
         }
     }
 }
+
+// This fn is intended for `#[proc_macro_derive(..)]` and `#[rustc_builtin_macro(..)]`, which have
+// the same strucuture.
+#[rustfmt::skip]
+pub(crate) fn parse_macro_name_and_helper_attrs(tt: &[TokenTree]) -> Option<(Name, Box<[Name]>)> {
+    match tt {
+        // `#[proc_macro_derive(Trait)]`
+        // `#[rustc_builtin_macro(Trait)]`
+        [TokenTree::Leaf(Leaf::Ident(trait_name))] => Some((trait_name.as_name(), Box::new([]))),
+
+        // `#[proc_macro_derive(Trait, attributes(helper1, helper2, ...))]`
+        // `#[rustc_builtin_macro(Trait, attributes(helper1, helper2, ...))]`
+        [
+            TokenTree::Leaf(Leaf::Ident(trait_name)),
+            TokenTree::Leaf(Leaf::Punct(comma)),
+            TokenTree::Leaf(Leaf::Ident(attributes)),
+            TokenTree::Subtree(helpers)
+        ] if comma.char == ',' && attributes.text == "attributes" =>
+        {
+            let helpers = helpers
+                .token_trees
+                .iter()
+                .filter(
+                    |tt| !matches!(tt, TokenTree::Leaf(Leaf::Punct(comma)) if comma.char == ','),
+                )
+                .map(|tt| match tt {
+                    TokenTree::Leaf(Leaf::Ident(helper)) => Some(helper.as_name()),
+                    _ => None,
+                })
+                .collect::<Option<Box<[_]>>>()?;
+
+            Some((trait_name.as_name(), helpers))
+        }
+
+        _ => None,
+    }
+}
diff --git a/crates/hir-def/src/nameres/tests/incremental.rs b/crates/hir-def/src/nameres/tests/incremental.rs
index 2e8cb3621f..f5190b76db 100644
--- a/crates/hir-def/src/nameres/tests/incremental.rs
+++ b/crates/hir-def/src/nameres/tests/incremental.rs
@@ -13,7 +13,7 @@ fn check_def_map_is_not_recomputed(ra_fixture_initial: &str, ra_fixture_change:
         let events = db.log_executed(|| {
             db.crate_def_map(krate);
         });
-        assert!(format!("{:?}", events).contains("crate_def_map"), "{:#?}", events)
+        assert!(format!("{events:?}").contains("crate_def_map"), "{events:#?}")
     }
     db.set_file_text(pos.file_id, Arc::new(ra_fixture_change.to_string()));
 
@@ -21,7 +21,7 @@ fn check_def_map_is_not_recomputed(ra_fixture_initial: &str, ra_fixture_change:
         let events = db.log_executed(|| {
             db.crate_def_map(krate);
         });
-        assert!(!format!("{:?}", events).contains("crate_def_map"), "{:#?}", events)
+        assert!(!format!("{events:?}").contains("crate_def_map"), "{events:#?}")
     }
 }
 
@@ -94,7 +94,7 @@ fn typing_inside_a_macro_should_not_invalidate_def_map() {
             let (_, module_data) = crate_def_map.modules.iter().last().unwrap();
             assert_eq!(module_data.scope.resolutions().count(), 1);
         });
-        assert!(format!("{:?}", events).contains("crate_def_map"), "{:#?}", events)
+        assert!(format!("{events:?}").contains("crate_def_map"), "{events:#?}")
     }
     db.set_file_text(pos.file_id, Arc::new("m!(Y);".to_string()));
 
@@ -104,7 +104,7 @@ fn typing_inside_a_macro_should_not_invalidate_def_map() {
             let (_, module_data) = crate_def_map.modules.iter().last().unwrap();
             assert_eq!(module_data.scope.resolutions().count(), 1);
         });
-        assert!(!format!("{:?}", events).contains("crate_def_map"), "{:#?}", events)
+        assert!(!format!("{events:?}").contains("crate_def_map"), "{events:#?}")
     }
 }
 
diff --git a/crates/hir-def/src/nameres/tests/macros.rs b/crates/hir-def/src/nameres/tests/macros.rs
index 3ece1379ad..fe0ad4f386 100644
--- a/crates/hir-def/src/nameres/tests/macros.rs
+++ b/crates/hir-def/src/nameres/tests/macros.rs
@@ -822,6 +822,28 @@ fn derive() {}
     );
 }
 
+#[test]
+fn resolves_derive_helper_rustc_builtin_macro() {
+    cov_mark::check!(resolved_derive_helper);
+    // This is NOT the correct usage of `default` helper attribute, but we don't resolve helper
+    // attributes on non mod items in hir nameres.
+    check(
+        r#"
+//- minicore: derive, default
+#[derive(Default)]
+#[default]
+enum E {
+    A,
+    B,
+}
+"#,
+        expect![[r#"
+            crate
+            E: t
+        "#]],
+    );
+}
+
 #[test]
 fn unresolved_attr_with_cfg_attr_hang() {
     // Another regression test for https://github.com/rust-lang/rust-analyzer/issues/8905
diff --git a/crates/hir-def/src/nameres/tests/mod_resolution.rs b/crates/hir-def/src/nameres/tests/mod_resolution.rs
index c575bf7cac..a019312884 100644
--- a/crates/hir-def/src/nameres/tests/mod_resolution.rs
+++ b/crates/hir-def/src/nameres/tests/mod_resolution.rs
@@ -156,6 +156,43 @@ pub struct Baz;
     );
 }
 
+#[test]
+fn module_resolution_works_for_inline_raw_modules() {
+    check(
+        r#"
+//- /lib.rs
+mod r#async {
+    pub mod a;
+    pub mod r#async;
+}
+use self::r#async::a::Foo;
+use self::r#async::r#async::Bar;
+
+//- /async/a.rs
+pub struct Foo;
+
+//- /async/async.rs
+pub struct Bar;
+"#,
+        expect![[r#"
+            crate
+            Bar: t v
+            Foo: t v
+            r#async: t
+
+            crate::r#async
+            a: t
+            r#async: t
+
+            crate::r#async::a
+            Foo: t v
+
+            crate::r#async::r#async
+            Bar: t v
+        "#]],
+    );
+}
+
 #[test]
 fn module_resolution_decl_path() {
     check(
diff --git a/crates/hir-def/src/pretty.rs b/crates/hir-def/src/pretty.rs
index 933970d10e..befd0c5ffa 100644
--- a/crates/hir-def/src/pretty.rs
+++ b/crates/hir-def/src/pretty.rs
@@ -92,7 +92,7 @@ pub(crate) fn print_generic_args(generics: &GenericArgs, buf: &mut dyn Write) ->
 pub(crate) fn print_generic_arg(arg: &GenericArg, buf: &mut dyn Write) -> fmt::Result {
     match arg {
         GenericArg::Type(ty) => print_type_ref(ty, buf),
-        GenericArg::Const(c) => write!(buf, "{}", c),
+        GenericArg::Const(c) => write!(buf, "{c}"),
         GenericArg::Lifetime(lt) => write!(buf, "{}", lt.name),
     }
 }
@@ -118,7 +118,7 @@ pub(crate) fn print_type_ref(type_ref: &TypeRef, buf: &mut dyn Write) -> fmt::Re
                 Mutability::Shared => "*const",
                 Mutability::Mut => "*mut",
             };
-            write!(buf, "{} ", mtbl)?;
+            write!(buf, "{mtbl} ")?;
             print_type_ref(pointee, buf)?;
         }
         TypeRef::Reference(pointee, lt, mtbl) => {
@@ -130,13 +130,13 @@ pub(crate) fn print_type_ref(type_ref: &TypeRef, buf: &mut dyn Write) -> fmt::Re
             if let Some(lt) = lt {
                 write!(buf, "{} ", lt.name)?;
             }
-            write!(buf, "{}", mtbl)?;
+            write!(buf, "{mtbl}")?;
             print_type_ref(pointee, buf)?;
         }
         TypeRef::Array(elem, len) => {
             write!(buf, "[")?;
             print_type_ref(elem, buf)?;
-            write!(buf, "; {}]", len)?;
+            write!(buf, "; {len}]")?;
         }
         TypeRef::Slice(elem) => {
             write!(buf, "[")?;
diff --git a/crates/hir-def/src/resolver.rs b/crates/hir-def/src/resolver.rs
index 070f683713..1ef7f9577f 100644
--- a/crates/hir-def/src/resolver.rs
+++ b/crates/hir-def/src/resolver.rs
@@ -381,7 +381,7 @@ impl Resolver {
         });
         def_map[module_id].scope.legacy_macros().for_each(|(name, macs)| {
             macs.iter().for_each(|&mac| {
-                res.add(name, ScopeDef::ModuleDef(ModuleDefId::MacroId(MacroId::from(mac))));
+                res.add(name, ScopeDef::ModuleDef(ModuleDefId::MacroId(mac)));
             })
         });
         def_map.extern_prelude().for_each(|(name, &def)| {
@@ -517,10 +517,7 @@ impl Scope {
                 });
                 m.def_map[m.module_id].scope.legacy_macros().for_each(|(name, macs)| {
                     macs.iter().for_each(|&mac| {
-                        acc.add(
-                            name,
-                            ScopeDef::ModuleDef(ModuleDefId::MacroId(MacroId::from(mac))),
-                        );
+                        acc.add(name, ScopeDef::ModuleDef(ModuleDefId::MacroId(mac)));
                     })
                 });
             }
diff --git a/crates/hir-expand/src/builtin_attr_macro.rs b/crates/hir-expand/src/builtin_attr_macro.rs
index 0c886ac4da..58d192f9fe 100644
--- a/crates/hir-expand/src/builtin_attr_macro.rs
+++ b/crates/hir-expand/src/builtin_attr_macro.rs
@@ -115,7 +115,8 @@ pub fn pseudo_derive_attr_expansion(
     };
 
     let mut token_trees = Vec::new();
-    for tt in (&args.token_trees)
+    for tt in args
+        .token_trees
         .split(|tt| matches!(tt, tt::TokenTree::Leaf(tt::Leaf::Punct(tt::Punct { char: ',', .. }))))
     {
         token_trees.push(mk_leaf('#'));
diff --git a/crates/hir-expand/src/builtin_fn_macro.rs b/crates/hir-expand/src/builtin_fn_macro.rs
index 7b19518e25..5522bdf3b3 100644
--- a/crates/hir-expand/src/builtin_fn_macro.rs
+++ b/crates/hir-expand/src/builtin_fn_macro.rs
@@ -379,15 +379,10 @@ fn compile_error_expand(
     tt: &tt::Subtree,
 ) -> ExpandResult<ExpandedEager> {
     let err = match &*tt.token_trees {
-        [tt::TokenTree::Leaf(tt::Leaf::Literal(it))] => {
-            let text = it.text.as_str();
-            if text.starts_with('"') && text.ends_with('"') {
-                // FIXME: does not handle raw strings
-                ExpandError::Other(text[1..text.len() - 1].into())
-            } else {
-                ExpandError::Other("`compile_error!` argument must be a string".into())
-            }
-        }
+        [tt::TokenTree::Leaf(tt::Leaf::Literal(it))] => match unquote_str(it) {
+            Some(unquoted) => ExpandError::Other(unquoted.into()),
+            None => ExpandError::Other("`compile_error!` argument must be a string".into()),
+        },
         _ => ExpandError::Other("`compile_error!` argument must be a string".into()),
     };
 
@@ -454,7 +449,7 @@ fn concat_bytes_expand(
                 match token.kind() {
                     syntax::SyntaxKind::BYTE => bytes.push(token.text().to_string()),
                     syntax::SyntaxKind::BYTE_STRING => {
-                        let components = unquote_byte_string(lit).unwrap_or_else(Vec::new);
+                        let components = unquote_byte_string(lit).unwrap_or_default();
                         components.into_iter().for_each(|x| bytes.push(x.to_string()));
                     }
                     _ => {
@@ -676,7 +671,7 @@ fn option_env_expand(
 
     let expanded = match get_env_inner(db, arg_id, &key) {
         None => quote! { #DOLLAR_CRATE::option::Option::None::<&str> },
-        Some(s) => quote! { #DOLLAR_CRATE::option::Some(#s) },
+        Some(s) => quote! { #DOLLAR_CRATE::option::Option::Some(#s) },
     };
 
     ExpandResult::ok(ExpandedEager::new(expanded))
diff --git a/crates/hir-expand/src/db.rs b/crates/hir-expand/src/db.rs
index 87e4db0398..b28e60187d 100644
--- a/crates/hir-expand/src/db.rs
+++ b/crates/hir-expand/src/db.rs
@@ -240,7 +240,7 @@ fn ast_id_map(db: &dyn AstDatabase, file_id: HirFileId) -> Arc<AstIdMap> {
 }
 
 fn parse_or_expand(db: &dyn AstDatabase, file_id: HirFileId) -> Option<SyntaxNode> {
-    match file_id.0 {
+    match file_id.repr() {
         HirFileIdRepr::FileId(file_id) => Some(db.parse(file_id).tree().syntax().clone()),
         HirFileIdRepr::MacroFile(macro_file) => {
             // FIXME: Note how we convert from `Parse` to `SyntaxNode` here,
@@ -444,7 +444,7 @@ fn macro_expand(db: &dyn AstDatabase, id: MacroCallId) -> ExpandResult<Option<Ar
         // be reported at the definition site (when we construct a def map).
         Err(err) => {
             return ExpandResult::only_err(ExpandError::Other(
-                format!("invalid macro definition: {}", err).into(),
+                format!("invalid macro definition: {err}").into(),
             ))
         }
     };
diff --git a/crates/hir-expand/src/eager.rs b/crates/hir-expand/src/eager.rs
index 5fd099aea7..a1474c44e6 100644
--- a/crates/hir-expand/src/eager.rs
+++ b/crates/hir-expand/src/eager.rs
@@ -161,7 +161,7 @@ pub fn expand_eager_macro(
 
         Ok(Ok(db.intern_macro_call(loc)))
     } else {
-        panic!("called `expand_eager_macro` on non-eager macro def {:?}", def);
+        panic!("called `expand_eager_macro` on non-eager macro def {def:?}");
     }
 }
 
@@ -208,7 +208,7 @@ fn eager_macro_recur(
     // Collect replacement
     for child in children {
         let def = match child.path().and_then(|path| ModPath::from_src(db, path, hygiene)) {
-            Some(path) => macro_resolver(path.clone()).ok_or_else(|| UnresolvedMacro { path })?,
+            Some(path) => macro_resolver(path.clone()).ok_or(UnresolvedMacro { path })?,
             None => {
                 diagnostic_sink(ExpandError::Other("malformed macro invocation".into()));
                 continue;
diff --git a/crates/hir-expand/src/fixup.rs b/crates/hir-expand/src/fixup.rs
index a4abe75626..75d364d5f8 100644
--- a/crates/hir-expand/src/fixup.rs
+++ b/crates/hir-expand/src/fixup.rs
@@ -366,7 +366,7 @@ mod tests {
             fixups.append,
         );
 
-        let actual = format!("{}\n", tt);
+        let actual = format!("{tt}\n");
 
         expect.indent(false);
         expect.assert_eq(&actual);
diff --git a/crates/hir-expand/src/hygiene.rs b/crates/hir-expand/src/hygiene.rs
index d60734372c..df1e20256c 100644
--- a/crates/hir-expand/src/hygiene.rs
+++ b/crates/hir-expand/src/hygiene.rs
@@ -17,7 +17,7 @@ use crate::{
     db::{self, AstDatabase},
     fixup,
     name::{AsName, Name},
-    HirFileId, HirFileIdRepr, InFile, MacroCallKind, MacroCallLoc, MacroDefKind, MacroFile,
+    HirFileId, InFile, MacroCallKind, MacroCallLoc, MacroDefKind, MacroFile,
 };
 
 #[derive(Clone, Debug)]
@@ -216,9 +216,9 @@ fn make_hygiene_info(
 
 impl HygieneFrame {
     pub(crate) fn new(db: &dyn AstDatabase, file_id: HirFileId) -> HygieneFrame {
-        let (info, krate, local_inner) = match file_id.0 {
-            HirFileIdRepr::FileId(_) => (None, None, false),
-            HirFileIdRepr::MacroFile(macro_file) => {
+        let (info, krate, local_inner) = match file_id.macro_file() {
+            None => (None, None, false),
+            Some(macro_file) => {
                 let loc = db.lookup_intern_macro_call(macro_file.macro_call_id);
                 let info =
                     make_hygiene_info(db, macro_file, &loc).map(|info| (loc.kind.file_id(), info));
diff --git a/crates/hir-expand/src/lib.rs b/crates/hir-expand/src/lib.rs
index 7352b003a4..bc5f9f3b8a 100644
--- a/crates/hir-expand/src/lib.rs
+++ b/crates/hir-expand/src/lib.rs
@@ -23,7 +23,11 @@ pub use mbe::{Origin, ValueResult};
 
 use std::{fmt, hash::Hash, iter, sync::Arc};
 
-use base_db::{impl_intern_key, salsa, CrateId, FileId, FileRange, ProcMacroKind};
+use base_db::{
+    impl_intern_key,
+    salsa::{self, InternId},
+    CrateId, FileId, FileRange, ProcMacroKind,
+};
 use either::Either;
 use syntax::{
     algo::{self, skip_trivia_token},
@@ -79,26 +83,12 @@ impl fmt::Display for ExpandError {
 /// finite (because everything bottoms out at the real `FileId`) and small
 /// (`MacroCallId` uses the location interning. You can check details here:
 /// <https://en.wikipedia.org/wiki/String_interning>).
+///
+/// The two variants are encoded in a single u32 which are differentiated by the MSB.
+/// If the MSB is 0, the value represents a `FileId`, otherwise the remaining 31 bits represent a
+/// `MacroCallId`.
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub struct HirFileId(HirFileIdRepr);
-
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-enum HirFileIdRepr {
-    FileId(FileId),
-    MacroFile(MacroFile),
-}
-
-impl From<FileId> for HirFileId {
-    fn from(id: FileId) -> Self {
-        HirFileId(HirFileIdRepr::FileId(id))
-    }
-}
-
-impl From<MacroFile> for HirFileId {
-    fn from(id: MacroFile) -> Self {
-        HirFileId(HirFileIdRepr::MacroFile(id))
-    }
-}
+pub struct HirFileId(u32);
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 pub struct MacroFile {
@@ -172,13 +162,37 @@ pub enum MacroCallKind {
     },
 }
 
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+enum HirFileIdRepr {
+    FileId(FileId),
+    MacroFile(MacroFile),
+}
+
+impl From<FileId> for HirFileId {
+    fn from(FileId(id): FileId) -> Self {
+        assert!(id < Self::MAX_FILE_ID);
+        HirFileId(id)
+    }
+}
+
+impl From<MacroFile> for HirFileId {
+    fn from(MacroFile { macro_call_id: MacroCallId(id) }: MacroFile) -> Self {
+        let id = id.as_u32();
+        assert!(id < Self::MAX_FILE_ID);
+        HirFileId(id | Self::MACRO_FILE_TAG_MASK)
+    }
+}
+
 impl HirFileId {
+    const MAX_FILE_ID: u32 = u32::MAX ^ Self::MACRO_FILE_TAG_MASK;
+    const MACRO_FILE_TAG_MASK: u32 = 1 << 31;
+
     /// For macro-expansion files, returns the file original source file the
     /// expansion originated from.
     pub fn original_file(self, db: &dyn db::AstDatabase) -> FileId {
         let mut file_id = self;
         loop {
-            match file_id.0 {
+            match file_id.repr() {
                 HirFileIdRepr::FileId(id) => break id,
                 HirFileIdRepr::MacroFile(MacroFile { macro_call_id }) => {
                     let loc: MacroCallLoc = db.lookup_intern_macro_call(macro_call_id);
@@ -194,7 +208,7 @@ impl HirFileId {
     pub fn expansion_level(self, db: &dyn db::AstDatabase) -> u32 {
         let mut level = 0;
         let mut curr = self;
-        while let HirFileIdRepr::MacroFile(macro_file) = curr.0 {
+        while let Some(macro_file) = curr.macro_file() {
             let loc: MacroCallLoc = db.lookup_intern_macro_call(macro_file.macro_call_id);
 
             level += 1;
@@ -205,25 +219,17 @@ impl HirFileId {
 
     /// If this is a macro call, returns the syntax node of the call.
     pub fn call_node(self, db: &dyn db::AstDatabase) -> Option<InFile<SyntaxNode>> {
-        match self.0 {
-            HirFileIdRepr::FileId(_) => None,
-            HirFileIdRepr::MacroFile(macro_file) => {
-                let loc: MacroCallLoc = db.lookup_intern_macro_call(macro_file.macro_call_id);
-                Some(loc.kind.to_node(db))
-            }
-        }
+        let macro_file = self.macro_file()?;
+        let loc: MacroCallLoc = db.lookup_intern_macro_call(macro_file.macro_call_id);
+        Some(loc.kind.to_node(db))
     }
 
     /// If this is a macro call, returns the syntax node of the very first macro call this file resides in.
     pub fn original_call_node(self, db: &dyn db::AstDatabase) -> Option<(FileId, SyntaxNode)> {
-        let mut call = match self.0 {
-            HirFileIdRepr::FileId(_) => return None,
-            HirFileIdRepr::MacroFile(MacroFile { macro_call_id }) => {
-                db.lookup_intern_macro_call(macro_call_id).kind.to_node(db)
-            }
-        };
+        let mut call =
+            db.lookup_intern_macro_call(self.macro_file()?.macro_call_id).kind.to_node(db);
         loop {
-            match call.file_id.0 {
+            match call.file_id.repr() {
                 HirFileIdRepr::FileId(file_id) => break Some((file_id, call.value)),
                 HirFileIdRepr::MacroFile(MacroFile { macro_call_id }) => {
                     call = db.lookup_intern_macro_call(macro_call_id).kind.to_node(db);
@@ -234,84 +240,74 @@ impl HirFileId {
 
     /// Return expansion information if it is a macro-expansion file
     pub fn expansion_info(self, db: &dyn db::AstDatabase) -> Option<ExpansionInfo> {
-        match self.0 {
-            HirFileIdRepr::FileId(_) => None,
-            HirFileIdRepr::MacroFile(macro_file) => {
-                let loc: MacroCallLoc = db.lookup_intern_macro_call(macro_file.macro_call_id);
+        let macro_file = self.macro_file()?;
+        let loc: MacroCallLoc = db.lookup_intern_macro_call(macro_file.macro_call_id);
 
-                let arg_tt = loc.kind.arg(db)?;
+        let arg_tt = loc.kind.arg(db)?;
 
-                let macro_def = db.macro_def(loc.def).ok()?;
-                let (parse, exp_map) = db.parse_macro_expansion(macro_file).value?;
-                let macro_arg = db.macro_arg(macro_file.macro_call_id)?;
+        let macro_def = db.macro_def(loc.def).ok()?;
+        let (parse, exp_map) = db.parse_macro_expansion(macro_file).value?;
+        let macro_arg = db.macro_arg(macro_file.macro_call_id)?;
 
-                let def = loc.def.ast_id().left().and_then(|id| {
-                    let def_tt = match id.to_node(db) {
-                        ast::Macro::MacroRules(mac) => mac.token_tree()?,
-                        ast::Macro::MacroDef(_)
-                            if matches!(*macro_def, TokenExpander::BuiltinAttr(_)) =>
-                        {
-                            return None
-                        }
-                        ast::Macro::MacroDef(mac) => mac.body()?,
-                    };
-                    Some(InFile::new(id.file_id, def_tt))
-                });
-                let attr_input_or_mac_def = def.or_else(|| match loc.kind {
-                    MacroCallKind::Attr { ast_id, invoc_attr_index, .. } => {
-                        let tt = ast_id
-                            .to_node(db)
-                            .doc_comments_and_attrs()
-                            .nth(invoc_attr_index as usize)
-                            .and_then(Either::left)?
-                            .token_tree()?;
-                        Some(InFile::new(ast_id.file_id, tt))
-                    }
-                    _ => None,
-                });
-
-                Some(ExpansionInfo {
-                    expanded: InFile::new(self, parse.syntax_node()),
-                    arg: InFile::new(loc.kind.file_id(), arg_tt),
-                    attr_input_or_mac_def,
-                    macro_arg_shift: mbe::Shift::new(&macro_arg.0),
-                    macro_arg,
-                    macro_def,
-                    exp_map,
-                })
+        let def = loc.def.ast_id().left().and_then(|id| {
+            let def_tt = match id.to_node(db) {
+                ast::Macro::MacroRules(mac) => mac.token_tree()?,
+                ast::Macro::MacroDef(_) if matches!(*macro_def, TokenExpander::BuiltinAttr(_)) => {
+                    return None
+                }
+                ast::Macro::MacroDef(mac) => mac.body()?,
+            };
+            Some(InFile::new(id.file_id, def_tt))
+        });
+        let attr_input_or_mac_def = def.or_else(|| match loc.kind {
+            MacroCallKind::Attr { ast_id, invoc_attr_index, .. } => {
+                let tt = ast_id
+                    .to_node(db)
+                    .doc_comments_and_attrs()
+                    .nth(invoc_attr_index as usize)
+                    .and_then(Either::left)?
+                    .token_tree()?;
+                Some(InFile::new(ast_id.file_id, tt))
             }
-        }
+            _ => None,
+        });
+
+        Some(ExpansionInfo {
+            expanded: InFile::new(self, parse.syntax_node()),
+            arg: InFile::new(loc.kind.file_id(), arg_tt),
+            attr_input_or_mac_def,
+            macro_arg_shift: mbe::Shift::new(&macro_arg.0),
+            macro_arg,
+            macro_def,
+            exp_map,
+        })
     }
 
     /// Indicate it is macro file generated for builtin derive
     pub fn is_builtin_derive(&self, db: &dyn db::AstDatabase) -> Option<InFile<ast::Attr>> {
-        match self.0 {
-            HirFileIdRepr::FileId(_) => None,
-            HirFileIdRepr::MacroFile(macro_file) => {
-                let loc: MacroCallLoc = db.lookup_intern_macro_call(macro_file.macro_call_id);
-                let attr = match loc.def.kind {
-                    MacroDefKind::BuiltInDerive(..) => loc.kind.to_node(db),
-                    _ => return None,
-                };
-                Some(attr.with_value(ast::Attr::cast(attr.value.clone())?))
-            }
-        }
+        let macro_file = self.macro_file()?;
+        let loc: MacroCallLoc = db.lookup_intern_macro_call(macro_file.macro_call_id);
+        let attr = match loc.def.kind {
+            MacroDefKind::BuiltInDerive(..) => loc.kind.to_node(db),
+            _ => return None,
+        };
+        Some(attr.with_value(ast::Attr::cast(attr.value.clone())?))
     }
 
     pub fn is_custom_derive(&self, db: &dyn db::AstDatabase) -> bool {
-        match self.0 {
-            HirFileIdRepr::FileId(_) => false,
-            HirFileIdRepr::MacroFile(macro_file) => {
+        match self.macro_file() {
+            Some(macro_file) => {
                 let loc: MacroCallLoc = db.lookup_intern_macro_call(macro_file.macro_call_id);
                 matches!(loc.def.kind, MacroDefKind::ProcMacro(_, ProcMacroKind::CustomDerive, _))
             }
+            None => false,
         }
     }
 
     /// Return whether this file is an include macro
     pub fn is_include_macro(&self, db: &dyn db::AstDatabase) -> bool {
-        match self.0 {
-            HirFileIdRepr::MacroFile(macro_file) => {
+        match self.macro_file() {
+            Some(macro_file) => {
                 let loc: MacroCallLoc = db.lookup_intern_macro_call(macro_file.macro_call_id);
                 matches!(loc.eager, Some(EagerCallInfo { included_file: Some(_), .. }))
             }
@@ -321,8 +317,8 @@ impl HirFileId {
 
     /// Return whether this file is an attr macro
     pub fn is_attr_macro(&self, db: &dyn db::AstDatabase) -> bool {
-        match self.0 {
-            HirFileIdRepr::MacroFile(macro_file) => {
+        match self.macro_file() {
+            Some(macro_file) => {
                 let loc: MacroCallLoc = db.lookup_intern_macro_call(macro_file.macro_call_id);
                 matches!(loc.kind, MacroCallKind::Attr { .. })
             }
@@ -333,23 +329,36 @@ impl HirFileId {
     /// Return whether this file is the pseudo expansion of the derive attribute.
     /// See [`crate::builtin_attr_macro::derive_attr_expand`].
     pub fn is_derive_attr_pseudo_expansion(&self, db: &dyn db::AstDatabase) -> bool {
-        match self.0 {
-            HirFileIdRepr::MacroFile(macro_file) => {
+        match self.macro_file() {
+            Some(macro_file) => {
                 let loc: MacroCallLoc = db.lookup_intern_macro_call(macro_file.macro_call_id);
                 matches!(loc.kind, MacroCallKind::Attr { is_derive: true, .. })
             }
-            _ => false,
+            None => false,
         }
     }
 
+    #[inline]
     pub fn is_macro(self) -> bool {
-        matches!(self.0, HirFileIdRepr::MacroFile(_))
+        self.0 & Self::MACRO_FILE_TAG_MASK != 0
     }
 
+    #[inline]
     pub fn macro_file(self) -> Option<MacroFile> {
-        match self.0 {
-            HirFileIdRepr::FileId(_) => None,
-            HirFileIdRepr::MacroFile(m) => Some(m),
+        match self.0 & Self::MACRO_FILE_TAG_MASK {
+            0 => None,
+            _ => Some(MacroFile {
+                macro_call_id: MacroCallId(InternId::from(self.0 ^ Self::MACRO_FILE_TAG_MASK)),
+            }),
+        }
+    }
+
+    fn repr(self) -> HirFileIdRepr {
+        match self.0 & Self::MACRO_FILE_TAG_MASK {
+            0 => HirFileIdRepr::FileId(FileId(self.0)),
+            _ => HirFileIdRepr::MacroFile(MacroFile {
+                macro_call_id: MacroCallId(InternId::from(self.0 ^ Self::MACRO_FILE_TAG_MASK)),
+            }),
         }
     }
 }
@@ -442,7 +451,7 @@ impl MacroCallKind {
     pub fn original_call_range_with_body(self, db: &dyn db::AstDatabase) -> FileRange {
         let mut kind = self;
         let file_id = loop {
-            match kind.file_id().0 {
+            match kind.file_id().repr() {
                 HirFileIdRepr::MacroFile(file) => {
                     kind = db.lookup_intern_macro_call(file.macro_call_id).kind;
                 }
@@ -467,7 +476,7 @@ impl MacroCallKind {
     pub fn original_call_range(self, db: &dyn db::AstDatabase) -> FileRange {
         let mut kind = self;
         let file_id = loop {
-            match kind.file_id().0 {
+            match kind.file_id().repr() {
                 HirFileIdRepr::MacroFile(file) => {
                     kind = db.lookup_intern_macro_call(file.macro_call_id).kind;
                 }
@@ -779,7 +788,7 @@ impl<'a> InFile<&'a SyntaxNode> {
     /// For attributes and derives, this will point back to the attribute only.
     /// For the entire item `InFile::use original_file_range_full`.
     pub fn original_file_range(self, db: &dyn db::AstDatabase) -> FileRange {
-        match self.file_id.0 {
+        match self.file_id.repr() {
             HirFileIdRepr::FileId(file_id) => FileRange { file_id, range: self.value.text_range() },
             HirFileIdRepr::MacroFile(mac_file) => {
                 if let Some(res) = self.original_file_range_opt(db) {
@@ -846,7 +855,7 @@ impl InFile<SyntaxToken> {
 
     /// Falls back to the macro call range if the node cannot be mapped up fully.
     pub fn original_file_range(self, db: &dyn db::AstDatabase) -> FileRange {
-        match self.file_id.0 {
+        match self.file_id.repr() {
             HirFileIdRepr::FileId(file_id) => FileRange { file_id, range: self.value.text_range() },
             HirFileIdRepr::MacroFile(mac_file) => {
                 if let Some(res) = self.original_file_range_opt(db) {
@@ -861,7 +870,7 @@ impl InFile<SyntaxToken> {
 
     /// Attempts to map the syntax node back up its macro calls.
     pub fn original_file_range_opt(self, db: &dyn db::AstDatabase) -> Option<FileRange> {
-        match self.file_id.0 {
+        match self.file_id.repr() {
             HirFileIdRepr::FileId(file_id) => {
                 Some(FileRange { file_id, range: self.value.text_range() })
             }
diff --git a/crates/hir-expand/src/name.rs b/crates/hir-expand/src/name.rs
index 2679a1c360..e8b3e312aa 100644
--- a/crates/hir-expand/src/name.rs
+++ b/crates/hir-expand/src/name.rs
@@ -62,7 +62,7 @@ impl<'a> UnescapedName<'a> {
                     it.clone()
                 }
             }
-            Repr::TupleField(it) => SmolStr::new(&it.to_string()),
+            Repr::TupleField(it) => SmolStr::new(it.to_string()),
         }
     }
 }
@@ -139,7 +139,7 @@ impl Name {
     pub fn to_smol_str(&self) -> SmolStr {
         match &self.0 {
             Repr::Text(it) => it.clone(),
-            Repr::TupleField(it) => SmolStr::new(&it.to_string()),
+            Repr::TupleField(it) => SmolStr::new(it.to_string()),
         }
     }
 
@@ -338,44 +338,6 @@ pub mod known {
         test_case,
         recursion_limit,
         feature,
-        // Safe intrinsics
-        abort,
-        add_with_overflow,
-        black_box,
-        bitreverse,
-        bswap,
-        caller_location,
-        ctlz,
-        ctpop,
-        cttz,
-        discriminant_value,
-        forget,
-        likely,
-        maxnumf32,
-        maxnumf64,
-        min_align_of_val,
-        min_align_of,
-        minnumf32,
-        minnumf64,
-        mul_with_overflow,
-        needs_drop,
-        ptr_guaranteed_eq,
-        ptr_guaranteed_ne,
-        rotate_left,
-        rotate_right,
-        rustc_peek,
-        saturating_add,
-        saturating_sub,
-        size_of_val,
-        size_of,
-        sub_with_overflow,
-        type_id,
-        type_name,
-        unlikely,
-        variant_count,
-        wrapping_add,
-        wrapping_mul,
-        wrapping_sub,
         // known methods of lang items
         eq,
         ne,
@@ -419,6 +381,8 @@ pub mod known {
         shr,
         sub_assign,
         sub,
+        unsafe_cell,
+        va_list
     );
 
     // self/Self cannot be used as an identifier
diff --git a/crates/hir-expand/src/quote.rs b/crates/hir-expand/src/quote.rs
index e839e97bf0..c0a7bc7ca8 100644
--- a/crates/hir-expand/src/quote.rs
+++ b/crates/hir-expand/src/quote.rs
@@ -233,7 +233,7 @@ mod tests {
 
         let quoted = quote!(#a);
         assert_eq!(quoted.to_string(), "hello");
-        let t = format!("{:?}", quoted);
+        let t = format!("{quoted:?}");
         assert_eq!(t, "SUBTREE $\n  IDENT   hello 4294967295");
     }
 
diff --git a/crates/hir-ty/Cargo.toml b/crates/hir-ty/Cargo.toml
index a1d6835bfa..ae837ac6dc 100644
--- a/crates/hir-ty/Cargo.toml
+++ b/crates/hir-ty/Cargo.toml
@@ -13,18 +13,20 @@ doctest = false
 cov-mark = "2.0.0-pre.1"
 itertools = "0.10.5"
 arrayvec = "0.7.2"
+bitflags = "1.3.2"
 smallvec = "1.10.0"
 ena = "0.14.0"
 tracing = "0.1.35"
 rustc-hash = "1.1.0"
 scoped-tls = "1.0.0"
-chalk-solve = { version = "0.86.0", default-features = false }
-chalk-ir = "0.86.0"
-chalk-recursive = { version = "0.86.0", default-features = false }
-chalk-derive = "0.86.0"
+chalk-solve = { version = "0.88.0", default-features = false }
+chalk-ir = "0.88.0"
+chalk-recursive = { version = "0.88.0", default-features = false }
+chalk-derive = "0.88.0"
 la-arena = { version = "0.3.0", path = "../../lib/la-arena" }
 once_cell = "1.15.0"
 typed-arena = "2.0.1"
+rustc_index = { version = "0.0.20221221", package = "hkalbasi-rustc-ap-rustc_index", default-features = false }
 
 stdx = { path = "../stdx", version = "0.0.0" }
 hir-def = { path = "../hir-def", version = "0.0.0" }
diff --git a/crates/hir-ty/src/autoderef.rs b/crates/hir-ty/src/autoderef.rs
index 78911d8dc0..cbcf8f74c5 100644
--- a/crates/hir-ty/src/autoderef.rs
+++ b/crates/hir-ty/src/autoderef.rs
@@ -82,11 +82,11 @@ pub(crate) fn autoderef_step(
 }
 
 // FIXME: replace uses of this with Autoderef above
-pub fn autoderef<'a>(
-    db: &'a dyn HirDatabase,
+pub fn autoderef(
+    db: &dyn HirDatabase,
     env: Arc<TraitEnvironment>,
     ty: Canonical<Ty>,
-) -> impl Iterator<Item = Canonical<Ty>> + 'a {
+) -> impl Iterator<Item = Canonical<Ty>> + '_ {
     let mut table = InferenceTable::new(db, env);
     let ty = table.instantiate_canonical(ty);
     let mut autoderef = Autoderef::new(&mut table, ty);
diff --git a/crates/hir-ty/src/builder.rs b/crates/hir-ty/src/builder.rs
index 9ae752556d..d5ef0c22de 100644
--- a/crates/hir-ty/src/builder.rs
+++ b/crates/hir-ty/src/builder.rs
@@ -142,7 +142,7 @@ impl<D> TyBuilder<D> {
         match (a.data(Interner), e) {
             (chalk_ir::GenericArgData::Ty(_), ParamKind::Type)
             | (chalk_ir::GenericArgData::Const(_), ParamKind::Const(_)) => (),
-            _ => panic!("Mismatched kinds: {:?}, {:?}, {:?}", a, self.vec, self.param_kinds),
+            _ => panic!("Mismatched kinds: {a:?}, {:?}, {:?}", self.vec, self.param_kinds),
         }
     }
 }
diff --git a/crates/hir-ty/src/chalk_db.rs b/crates/hir-ty/src/chalk_db.rs
index 43c3451cab..1c2b8de7f7 100644
--- a/crates/hir-ty/src/chalk_db.rs
+++ b/crates/hir-ty/src/chalk_db.rs
@@ -568,6 +568,7 @@ fn well_known_trait_from_lang_attr(name: &str) -> Option<WellKnownTrait> {
         "sized" => WellKnownTrait::Sized,
         "unpin" => WellKnownTrait::Unpin,
         "unsize" => WellKnownTrait::Unsize,
+        "tuple_trait" => WellKnownTrait::Tuple,
         _ => return None,
     })
 }
@@ -585,6 +586,7 @@ fn lang_attr_from_well_known_trait(attr: WellKnownTrait) -> &'static str {
         WellKnownTrait::FnOnce => "fn_once",
         WellKnownTrait::Generator => "generator",
         WellKnownTrait::Sized => "sized",
+        WellKnownTrait::Tuple => "tuple_trait",
         WellKnownTrait::Unpin => "unpin",
         WellKnownTrait::Unsize => "unsize",
     }
diff --git a/crates/hir-ty/src/consteval.rs b/crates/hir-ty/src/consteval.rs
index 2c0c6e0b83..8df70330fa 100644
--- a/crates/hir-ty/src/consteval.rs
+++ b/crates/hir-ty/src/consteval.rs
@@ -90,14 +90,14 @@ impl Display for ComputedExpr {
             ComputedExpr::Literal(l) => match l {
                 Literal::Int(x, _) => {
                     if *x >= 10 {
-                        write!(f, "{} ({:#X})", x, x)
+                        write!(f, "{x} ({x:#X})")
                     } else {
                         x.fmt(f)
                     }
                 }
                 Literal::Uint(x, _) => {
                     if *x >= 10 {
-                        write!(f, "{} ({:#X})", x, x)
+                        write!(f, "{x} ({x:#X})")
                     } else {
                         x.fmt(f)
                     }
@@ -131,7 +131,7 @@ fn scalar_max(scalar: &Scalar) -> i128 {
             IntTy::I16 => i16::MAX as i128,
             IntTy::I32 => i32::MAX as i128,
             IntTy::I64 => i64::MAX as i128,
-            IntTy::I128 => i128::MAX as i128,
+            IntTy::I128 => i128::MAX,
         },
         Scalar::Uint(x) => match x {
             chalk_ir::UintTy::Usize => usize::MAX as i128,
@@ -139,7 +139,7 @@ fn scalar_max(scalar: &Scalar) -> i128 {
             chalk_ir::UintTy::U16 => u16::MAX as i128,
             chalk_ir::UintTy::U32 => u32::MAX as i128,
             chalk_ir::UintTy::U64 => u64::MAX as i128,
-            chalk_ir::UintTy::U128 => i128::MAX as i128, // ignore too big u128 for now
+            chalk_ir::UintTy::U128 => i128::MAX, // ignore too big u128 for now
         },
         Scalar::Float(_) => 0,
     }
@@ -351,15 +351,17 @@ pub fn eval_const(
                         .infer
                         .assoc_resolutions_for_expr(expr_id)
                         .ok_or(ConstEvalError::SemanticError("unresolved assoc item"))?
+                        .0
                     {
                         hir_def::AssocItemId::FunctionId(_) => {
                             Err(ConstEvalError::NotSupported("assoc function"))
                         }
+                        // FIXME use actual impl for trait assoc const
                         hir_def::AssocItemId::ConstId(c) => ctx.db.const_eval(c),
                         hir_def::AssocItemId::TypeAliasId(_) => {
                             Err(ConstEvalError::NotSupported("assoc type alias"))
                         }
-                    }
+                    };
                 }
             };
             match pr {
@@ -402,7 +404,7 @@ pub(crate) fn path_to_const(
     args_lazy: impl FnOnce() -> Generics,
     debruijn: DebruijnIndex,
 ) -> Option<Const> {
-    match resolver.resolve_path_in_value_ns_fully(db.upcast(), &path) {
+    match resolver.resolve_path_in_value_ns_fully(db.upcast(), path) {
         Some(ValueNs::GenericParam(p)) => {
             let ty = db.const_param_ty(p);
             let args = args_lazy();
@@ -509,10 +511,10 @@ pub(crate) fn const_eval_query_variant(
     )
 }
 
-pub(crate) fn eval_to_const<'a>(
+pub(crate) fn eval_to_const(
     expr: Idx<Expr>,
     mode: ParamLoweringMode,
-    ctx: &mut InferenceContext<'a>,
+    ctx: &mut InferenceContext<'_>,
     args: impl FnOnce() -> Generics,
     debruijn: DebruijnIndex,
 ) -> Const {
diff --git a/crates/hir-ty/src/consteval/tests.rs b/crates/hir-ty/src/consteval/tests.rs
index b76506f6eb..3c930c077b 100644
--- a/crates/hir-ty/src/consteval/tests.rs
+++ b/crates/hir-ty/src/consteval/tests.rs
@@ -14,7 +14,7 @@ fn check_number(ra_fixture: &str, answer: i128) {
     match r {
         ComputedExpr::Literal(Literal::Int(r, _)) => assert_eq!(r, answer),
         ComputedExpr::Literal(Literal::Uint(r, _)) => assert_eq!(r, answer as u128),
-        x => panic!("Expected number but found {:?}", x),
+        x => panic!("Expected number but found {x:?}"),
     }
 }
 
@@ -25,7 +25,6 @@ fn eval_goal(ra_fixture: &str) -> Result<ComputedExpr, ConstEvalError> {
     let scope = &def_map[module_id.local_id].scope;
     let const_id = scope
         .declarations()
-        .into_iter()
         .find_map(|x| match x {
             hir_def::ModuleDefId::ConstId(x) => {
                 if db.const_data(x).name.as_ref()?.to_string() == "GOAL" {
@@ -126,7 +125,7 @@ fn enums() {
             assert_eq!(name, "E::A");
             assert_eq!(val, 1);
         }
-        x => panic!("Expected enum but found {:?}", x),
+        x => panic!("Expected enum but found {x:?}"),
     }
 }
 
diff --git a/crates/hir-ty/src/db.rs b/crates/hir-ty/src/db.rs
index 932fce8356..54b244620f 100644
--- a/crates/hir-ty/src/db.rs
+++ b/crates/hir-ty/src/db.rs
@@ -3,20 +3,23 @@
 
 use std::sync::Arc;
 
-use arrayvec::ArrayVec;
 use base_db::{impl_intern_key, salsa, CrateId, Upcast};
 use hir_def::{
-    db::DefDatabase, expr::ExprId, BlockId, ConstId, ConstParamId, DefWithBodyId, EnumVariantId,
-    FunctionId, GenericDefId, ImplId, LifetimeParamId, LocalFieldId, TypeOrConstParamId, VariantId,
+    db::DefDatabase,
+    expr::ExprId,
+    layout::{Layout, LayoutError, TargetDataLayout},
+    AdtId, BlockId, ConstId, ConstParamId, DefWithBodyId, EnumVariantId, FunctionId, GenericDefId,
+    ImplId, LifetimeParamId, LocalFieldId, TypeOrConstParamId, VariantId,
 };
 use la_arena::ArenaMap;
+use smallvec::SmallVec;
 
 use crate::{
     chalk_db,
     consteval::{ComputedExpr, ConstEvalError},
     method_resolution::{InherentImpls, TraitImpls, TyFingerprint},
     Binders, CallableDefId, FnDefId, GenericArg, ImplTraitId, InferenceResult, Interner, PolyFnSig,
-    QuantifiedWhereClause, ReturnTypeImplTraits, TraitRef, Ty, TyDefId, ValueTyDefId,
+    QuantifiedWhereClause, ReturnTypeImplTraits, Substitution, TraitRef, Ty, TyDefId, ValueTyDefId,
 };
 use hir_expand::name::Name;
 
@@ -57,6 +60,13 @@ pub trait HirDatabase: DefDatabase + Upcast<dyn DefDatabase> {
     #[salsa::invoke(crate::lower::field_types_query)]
     fn field_types(&self, var: VariantId) -> Arc<ArenaMap<LocalFieldId, Binders<Ty>>>;
 
+    #[salsa::invoke(crate::layout::layout_of_adt_query)]
+    #[salsa::cycle(crate::layout::layout_of_adt_recover)]
+    fn layout_of_adt(&self, def: AdtId, subst: Substitution) -> Result<Layout, LayoutError>;
+
+    #[salsa::invoke(crate::layout::target_data_layout_query)]
+    fn target_data_layout(&self, krate: CrateId) -> Arc<TargetDataLayout>;
+
     #[salsa::invoke(crate::lower::callable_item_sig)]
     fn callable_item_signature(&self, def: CallableDefId) -> PolyFnSig;
 
@@ -92,10 +102,15 @@ pub trait HirDatabase: DefDatabase + Upcast<dyn DefDatabase> {
     fn inherent_impls_in_block(&self, block: BlockId) -> Option<Arc<InherentImpls>>;
 
     /// Collects all crates in the dependency graph that have impls for the
-    /// given fingerprint. This is only used for primitive types; for
-    /// user-defined types we just look at the crate where the type is defined.
-    #[salsa::invoke(crate::method_resolution::inherent_impl_crates_query)]
-    fn inherent_impl_crates(&self, krate: CrateId, fp: TyFingerprint) -> ArrayVec<CrateId, 2>;
+    /// given fingerprint. This is only used for primitive types and types
+    /// annotated with `rustc_has_incoherent_inherent_impls`; for other types
+    /// we just look at the crate where the type is defined.
+    #[salsa::invoke(crate::method_resolution::incoherent_inherent_impl_crates)]
+    fn incoherent_inherent_impl_crates(
+        &self,
+        krate: CrateId,
+        fp: TyFingerprint,
+    ) -> SmallVec<[CrateId; 2]>;
 
     #[salsa::invoke(TraitImpls::trait_impls_in_crate_query)]
     fn trait_impls_in_crate(&self, krate: CrateId) -> Arc<TraitImpls>;
diff --git a/crates/hir-ty/src/diagnostics/match_check.rs b/crates/hir-ty/src/diagnostics/match_check.rs
index d51ad72bd2..8b0f051b46 100644
--- a/crates/hir-ty/src/diagnostics/match_check.rs
+++ b/crates/hir-ty/src/diagnostics/match_check.rs
@@ -12,16 +12,16 @@ pub(crate) mod usefulness;
 
 use chalk_ir::Mutability;
 use hir_def::{
-    adt::VariantData, body::Body, expr::PatId, AdtId, EnumVariantId, HasModule, LocalFieldId,
-    VariantId,
+    adt::VariantData, body::Body, expr::PatId, AdtId, EnumVariantId, LocalFieldId, VariantId,
 };
-use hir_expand::name::{name, Name};
+use hir_expand::name::Name;
 use stdx::{always, never};
 
 use crate::{
     db::HirDatabase,
     display::{HirDisplay, HirDisplayError, HirFormatter},
     infer::BindingMode,
+    lang_items::is_box,
     InferenceResult, Interner, Substitution, Ty, TyExt, TyKind,
 };
 
@@ -386,7 +386,7 @@ impl HirDisplay for Pat {
                 }
                 subpattern.hir_fmt(f)
             }
-            PatKind::LiteralBool { value } => write!(f, "{}", value),
+            PatKind::LiteralBool { value } => write!(f, "{value}"),
             PatKind::Or { pats } => f.write_joined(pats.iter(), " | "),
         }
     }
@@ -405,13 +405,6 @@ where
     }
 }
 
-fn is_box(adt: AdtId, db: &dyn HirDatabase) -> bool {
-    let owned_box = name![owned_box].to_smol_str();
-    let krate = adt.module(db.upcast()).krate();
-    let box_adt = db.lang_item(krate, owned_box).and_then(|it| it.as_struct()).map(AdtId::from);
-    Some(adt) == box_adt
-}
-
 pub(crate) trait PatternFoldable: Sized {
     fn fold_with<F: PatternFolder>(&self, folder: &mut F) -> Self {
         self.super_fold_with(folder)
diff --git a/crates/hir-ty/src/diagnostics/match_check/deconstruct_pat.rs b/crates/hir-ty/src/diagnostics/match_check/deconstruct_pat.rs
index 47d60fc41e..d130827a77 100644
--- a/crates/hir-ty/src/diagnostics/match_check/deconstruct_pat.rs
+++ b/crates/hir-ty/src/diagnostics/match_check/deconstruct_pat.rs
@@ -372,7 +372,7 @@ impl Constructor {
                     hir_def::AdtId::UnionId(id) => id.into(),
                 }
             }
-            _ => panic!("bad constructor {:?} for adt {:?}", self, adt),
+            _ => panic!("bad constructor {self:?} for adt {adt:?}"),
         }
     }
 
diff --git a/crates/hir-ty/src/display.rs b/crates/hir-ty/src/display.rs
index a22a4b170f..66e813eed8 100644
--- a/crates/hir-ty/src/display.rs
+++ b/crates/hir-ty/src/display.rs
@@ -16,7 +16,7 @@ use hir_def::{
     path::{Path, PathKind},
     type_ref::{ConstScalar, TraitBoundModifier, TypeBound, TypeRef},
     visibility::Visibility,
-    HasModule, ItemContainerId, Lookup, ModuleId, TraitId,
+    HasModule, ItemContainerId, Lookup, ModuleDefId, ModuleId, TraitId,
 };
 use hir_expand::{hygiene::Hygiene, name::Name};
 use itertools::Itertools;
@@ -35,9 +35,27 @@ use crate::{
     TraitRefExt, Ty, TyExt, TyKind, WhereClause,
 };
 
+pub trait HirWrite: fmt::Write {
+    fn start_location_link(&mut self, location: ModuleDefId);
+    fn end_location_link(&mut self);
+}
+
+// String will ignore link metadata
+impl HirWrite for String {
+    fn start_location_link(&mut self, _: ModuleDefId) {}
+
+    fn end_location_link(&mut self) {}
+}
+
+// `core::Formatter` will ignore metadata
+impl HirWrite for fmt::Formatter<'_> {
+    fn start_location_link(&mut self, _: ModuleDefId) {}
+    fn end_location_link(&mut self) {}
+}
+
 pub struct HirFormatter<'a> {
     pub db: &'a dyn HirDatabase,
-    fmt: &'a mut dyn fmt::Write,
+    fmt: &'a mut dyn HirWrite,
     buf: String,
     curr_size: usize,
     pub(crate) max_size: Option<usize>,
@@ -45,6 +63,16 @@ pub struct HirFormatter<'a> {
     display_target: DisplayTarget,
 }
 
+impl HirFormatter<'_> {
+    fn start_location_link(&mut self, location: ModuleDefId) {
+        self.fmt.start_location_link(location);
+    }
+
+    fn end_location_link(&mut self) {
+        self.fmt.end_location_link();
+    }
+}
+
 pub trait HirDisplay {
     fn hir_fmt(&self, f: &mut HirFormatter<'_>) -> Result<(), HirDisplayError>;
 
@@ -148,13 +176,13 @@ impl<'a> HirFormatter<'a> {
         let mut first = true;
         for e in iter {
             if !first {
-                write!(self, "{}", sep)?;
+                write!(self, "{sep}")?;
             }
             first = false;
 
             // Abbreviate multiple omitted types with a single ellipsis.
             if self.should_truncate() {
-                return write!(self, "{}", TYPE_HINT_TRUNCATION);
+                return write!(self, "{TYPE_HINT_TRUNCATION}");
             }
 
             e.hir_fmt(self)?;
@@ -245,12 +273,9 @@ pub struct HirDisplayWrapper<'a, T> {
     display_target: DisplayTarget,
 }
 
-impl<'a, T> fmt::Display for HirDisplayWrapper<'a, T>
-where
-    T: HirDisplay,
-{
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self.t.hir_fmt(&mut HirFormatter {
+impl<T: HirDisplay> HirDisplayWrapper<'_, T> {
+    pub fn write_to<F: HirWrite>(&self, f: &mut F) -> Result<(), HirDisplayError> {
+        self.t.hir_fmt(&mut HirFormatter {
             db: self.db,
             fmt: f,
             buf: String::with_capacity(20),
@@ -258,7 +283,16 @@ where
             max_size: self.max_size,
             omit_verbose_types: self.omit_verbose_types,
             display_target: self.display_target,
-        }) {
+        })
+    }
+}
+
+impl<'a, T> fmt::Display for HirDisplayWrapper<'a, T>
+where
+    T: HirDisplay,
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self.write_to(f) {
             Ok(()) => Ok(()),
             Err(HirDisplayError::FmtError) => Err(fmt::Error),
             Err(HirDisplayError::DisplaySourceCodeError(_)) => {
@@ -286,7 +320,7 @@ impl<T: HirDisplay + Internable> HirDisplay for Interned<T> {
 impl HirDisplay for ProjectionTy {
     fn hir_fmt(&self, f: &mut HirFormatter<'_>) -> Result<(), HirDisplayError> {
         if f.should_truncate() {
-            return write!(f, "{}", TYPE_HINT_TRUNCATION);
+            return write!(f, "{TYPE_HINT_TRUNCATION}");
         }
 
         let trait_ref = self.trait_ref(f.db);
@@ -308,7 +342,7 @@ impl HirDisplay for ProjectionTy {
 impl HirDisplay for OpaqueTy {
     fn hir_fmt(&self, f: &mut HirFormatter<'_>) -> Result<(), HirDisplayError> {
         if f.should_truncate() {
-            return write!(f, "{}", TYPE_HINT_TRUNCATION);
+            return write!(f, "{TYPE_HINT_TRUNCATION}");
         }
 
         self.substitution.at(Interner, 0).hir_fmt(f)
@@ -351,7 +385,7 @@ impl HirDisplay for BoundVar {
 impl HirDisplay for Ty {
     fn hir_fmt(&self, f: &mut HirFormatter<'_>) -> Result<(), HirDisplayError> {
         if f.should_truncate() {
-            return write!(f, "{}", TYPE_HINT_TRUNCATION);
+            return write!(f, "{TYPE_HINT_TRUNCATION}");
         }
 
         match self.kind(Interner) {
@@ -530,6 +564,7 @@ impl HirDisplay for Ty {
                 }
             }
             TyKind::Adt(AdtId(def_id), parameters) => {
+                f.start_location_link((*def_id).into());
                 match f.display_target {
                     DisplayTarget::Diagnostics | DisplayTarget::Test => {
                         let name = match *def_id {
@@ -537,7 +572,7 @@ impl HirDisplay for Ty {
                             hir_def::AdtId::UnionId(it) => f.db.union_data(it).name.clone(),
                             hir_def::AdtId::EnumId(it) => f.db.enum_data(it).name.clone(),
                         };
-                        write!(f, "{}", name)?;
+                        write!(f, "{name}")?;
                     }
                     DisplayTarget::SourceCode { module_id } => {
                         if let Some(path) = find_path::find_path(
@@ -546,7 +581,7 @@ impl HirDisplay for Ty {
                             module_id,
                             false,
                         ) {
-                            write!(f, "{}", path)?;
+                            write!(f, "{path}")?;
                         } else {
                             return Err(HirDisplayError::DisplaySourceCodeError(
                                 DisplaySourceCodeError::PathNotFound,
@@ -554,6 +589,7 @@ impl HirDisplay for Ty {
                         }
                     }
                 }
+                f.end_location_link();
 
                 if parameters.len(Interner) > 0 {
                     let parameters_to_write = if f.display_target.is_source_code()
@@ -701,7 +737,7 @@ impl HirDisplay for Ty {
                     if sig.params().is_empty() {
                         write!(f, "||")?;
                     } else if f.should_truncate() {
-                        write!(f, "|{}|", TYPE_HINT_TRUNCATION)?;
+                        write!(f, "|{TYPE_HINT_TRUNCATION}|")?;
                     } else {
                         write!(f, "|")?;
                         f.write_joined(sig.params(), ", ")?;
@@ -892,7 +928,7 @@ pub fn write_bounds_like_dyn_trait_with_prefix(
     default_sized: SizedByDefault,
     f: &mut HirFormatter<'_>,
 ) -> Result<(), HirDisplayError> {
-    write!(f, "{}", prefix)?;
+    write!(f, "{prefix}")?;
     if !predicates.is_empty()
         || predicates.is_empty() && matches!(default_sized, SizedByDefault::Sized { .. })
     {
@@ -1020,7 +1056,7 @@ fn fmt_trait_ref(
     use_as: bool,
 ) -> Result<(), HirDisplayError> {
     if f.should_truncate() {
-        return write!(f, "{}", TYPE_HINT_TRUNCATION);
+        return write!(f, "{TYPE_HINT_TRUNCATION}");
     }
 
     tr.self_type_parameter(Interner).hir_fmt(f)?;
@@ -1047,7 +1083,7 @@ impl HirDisplay for TraitRef {
 impl HirDisplay for WhereClause {
     fn hir_fmt(&self, f: &mut HirFormatter<'_>) -> Result<(), HirDisplayError> {
         if f.should_truncate() {
-            return write!(f, "{}", TYPE_HINT_TRUNCATION);
+            return write!(f, "{TYPE_HINT_TRUNCATION}");
         }
 
         match self {
@@ -1098,7 +1134,6 @@ impl HirDisplay for LifetimeData {
                 write!(f, "{}", param_data.name)
             }
             LifetimeData::Static => write!(f, "'static"),
-            LifetimeData::Empty(_) => Ok(()),
             LifetimeData::Erased => Ok(()),
             LifetimeData::Phantom(_, _) => Ok(()),
         }
@@ -1162,7 +1197,7 @@ impl HirDisplay for TypeRef {
                     hir_def::type_ref::Mutability::Shared => "*const ",
                     hir_def::type_ref::Mutability::Mut => "*mut ",
                 };
-                write!(f, "{}", mutability)?;
+                write!(f, "{mutability}")?;
                 inner.hir_fmt(f)?;
             }
             TypeRef::Reference(inner, lifetime, mutability) => {
@@ -1174,13 +1209,13 @@ impl HirDisplay for TypeRef {
                 if let Some(lifetime) = lifetime {
                     write!(f, "{} ", lifetime.name)?;
                 }
-                write!(f, "{}", mutability)?;
+                write!(f, "{mutability}")?;
                 inner.hir_fmt(f)?;
             }
             TypeRef::Array(inner, len) => {
                 write!(f, "[")?;
                 inner.hir_fmt(f)?;
-                write!(f, "; {}]", len)?;
+                write!(f, "; {len}]")?;
             }
             TypeRef::Slice(inner) => {
                 write!(f, "[")?;
@@ -1197,7 +1232,7 @@ impl HirDisplay for TypeRef {
                     for index in 0..function_parameters.len() {
                         let (param_name, param_type) = &function_parameters[index];
                         if let Some(name) = param_name {
-                            write!(f, "{}: ", name)?;
+                            write!(f, "{name}: ")?;
                         }
 
                         param_type.hir_fmt(f)?;
@@ -1373,7 +1408,7 @@ impl HirDisplay for hir_def::path::GenericArg {
     fn hir_fmt(&self, f: &mut HirFormatter<'_>) -> Result<(), HirDisplayError> {
         match self {
             hir_def::path::GenericArg::Type(ty) => ty.hir_fmt(f),
-            hir_def::path::GenericArg::Const(c) => write!(f, "{}", c),
+            hir_def::path::GenericArg::Const(c) => write!(f, "{c}"),
             hir_def::path::GenericArg::Lifetime(lifetime) => write!(f, "{}", lifetime.name),
         }
     }
diff --git a/crates/hir-ty/src/infer.rs b/crates/hir-ty/src/infer.rs
index 0b3c23f574..6b59f1c20d 100644
--- a/crates/hir-ty/src/infer.rs
+++ b/crates/hir-ty/src/infer.rs
@@ -19,10 +19,11 @@ use std::sync::Arc;
 use chalk_ir::{cast::Cast, ConstValue, DebruijnIndex, Mutability, Safety, Scalar, TypeFlags};
 use hir_def::{
     body::Body,
-    builtin_type::BuiltinType,
+    builtin_type::{BuiltinInt, BuiltinType, BuiltinUint},
     data::{ConstData, StaticData},
-    expr::{BindingAnnotation, ExprId, PatId},
+    expr::{BindingAnnotation, ExprId, ExprOrPatId, PatId},
     lang_item::LangItemTarget,
+    layout::Integer,
     path::{path, Path},
     resolver::{HasResolver, ResolveValueResult, Resolver, TypeNs, ValueNs},
     type_ref::TypeRef,
@@ -33,7 +34,7 @@ use hir_expand::name::{name, Name};
 use itertools::Either;
 use la_arena::ArenaMap;
 use rustc_hash::FxHashMap;
-use stdx::{always, impl_from};
+use stdx::always;
 
 use crate::{
     db::HirDatabase, fold_tys, fold_tys_and_consts, infer::coerce::CoerceMany,
@@ -70,8 +71,26 @@ pub(crate) fn infer_query(db: &dyn HirDatabase, def: DefWithBodyId) -> Arc<Infer
         DefWithBodyId::StaticId(s) => ctx.collect_static(&db.static_data(s)),
         DefWithBodyId::VariantId(v) => {
             ctx.return_ty = TyBuilder::builtin(match db.enum_data(v.parent).variant_body_type() {
-                Either::Left(builtin) => BuiltinType::Int(builtin),
-                Either::Right(builtin) => BuiltinType::Uint(builtin),
+                hir_def::layout::IntegerType::Pointer(signed) => match signed {
+                    true => BuiltinType::Int(BuiltinInt::Isize),
+                    false => BuiltinType::Uint(BuiltinUint::Usize),
+                },
+                hir_def::layout::IntegerType::Fixed(size, signed) => match signed {
+                    true => BuiltinType::Int(match size {
+                        Integer::I8 => BuiltinInt::I8,
+                        Integer::I16 => BuiltinInt::I16,
+                        Integer::I32 => BuiltinInt::I32,
+                        Integer::I64 => BuiltinInt::I64,
+                        Integer::I128 => BuiltinInt::I128,
+                    }),
+                    false => BuiltinType::Uint(match size {
+                        Integer::I8 => BuiltinUint::U8,
+                        Integer::I16 => BuiltinUint::U16,
+                        Integer::I32 => BuiltinUint::U32,
+                        Integer::I64 => BuiltinUint::U64,
+                        Integer::I128 => BuiltinUint::U128,
+                    }),
+                },
             });
         }
     }
@@ -101,13 +120,6 @@ pub(crate) fn normalize(db: &dyn HirDatabase, owner: DefWithBodyId, ty: Ty) -> T
     table.resolve_completely(ty_with_vars)
 }
 
-#[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
-enum ExprOrPatId {
-    ExprId(ExprId),
-    PatId(PatId),
-}
-impl_from!(ExprId, PatId for ExprOrPatId);
-
 /// Binding modes inferred for patterns.
 /// <https://doc.rust-lang.org/reference/patterns.html#binding-modes>
 #[derive(Copy, Clone, Debug, Eq, PartialEq)]
@@ -189,6 +201,8 @@ pub(crate) type InferResult<T> = Result<InferOk<T>, TypeError>;
 #[derive(Debug, PartialEq, Eq, Clone)]
 pub enum InferenceDiagnostic {
     NoSuchField { expr: ExprId },
+    PrivateField { expr: ExprId, field: FieldId },
+    PrivateAssocItem { id: ExprOrPatId, item: AssocItemId },
     BreakOutsideOfLoop { expr: ExprId, is_break: bool },
     MismatchedArgCount { call_expr: ExprId, expected: usize, found: usize },
 }
@@ -330,7 +344,7 @@ pub struct InferenceResult {
     /// For each struct literal or pattern, records the variant it resolves to.
     variant_resolutions: FxHashMap<ExprOrPatId, VariantId>,
     /// For each associated item record what it resolves to
-    assoc_resolutions: FxHashMap<ExprOrPatId, AssocItemId>,
+    assoc_resolutions: FxHashMap<ExprOrPatId, (AssocItemId, Substitution)>,
     pub diagnostics: Vec<InferenceDiagnostic>,
     pub type_of_expr: ArenaMap<ExprId, Ty>,
     /// For each pattern record the type it resolves to.
@@ -360,11 +374,11 @@ impl InferenceResult {
     pub fn variant_resolution_for_pat(&self, id: PatId) -> Option<VariantId> {
         self.variant_resolutions.get(&id.into()).copied()
     }
-    pub fn assoc_resolutions_for_expr(&self, id: ExprId) -> Option<AssocItemId> {
-        self.assoc_resolutions.get(&id.into()).copied()
+    pub fn assoc_resolutions_for_expr(&self, id: ExprId) -> Option<(AssocItemId, Substitution)> {
+        self.assoc_resolutions.get(&id.into()).cloned()
     }
-    pub fn assoc_resolutions_for_pat(&self, id: PatId) -> Option<AssocItemId> {
-        self.assoc_resolutions.get(&id.into()).copied()
+    pub fn assoc_resolutions_for_pat(&self, id: PatId) -> Option<(AssocItemId, Substitution)> {
+        self.assoc_resolutions.get(&id.into()).cloned()
     }
     pub fn type_mismatch_for_expr(&self, expr: ExprId) -> Option<&TypeMismatch> {
         self.type_mismatches.get(&expr.into())
@@ -484,7 +498,7 @@ impl<'a> InferenceContext<'a> {
             result: InferenceResult::default(),
             table: unify::InferenceTable::new(db, trait_env.clone()),
             trait_env,
-            return_ty: TyKind::Error.intern(Interner), // set in collect_fn_signature
+            return_ty: TyKind::Error.intern(Interner), // set in collect_* calls
             resume_yield_tys: None,
             db,
             owner,
@@ -498,6 +512,8 @@ impl<'a> InferenceContext<'a> {
     fn resolve_all(self) -> InferenceResult {
         let InferenceContext { mut table, mut result, .. } = self;
 
+        table.fallback_if_possible();
+
         // FIXME resolve obligations as well (use Guidance if necessary)
         table.resolve_obligations_as_possible();
 
@@ -516,6 +532,9 @@ impl<'a> InferenceContext<'a> {
         for (_, subst) in result.method_resolutions.values_mut() {
             *subst = table.resolve_completely(subst.clone());
         }
+        for (_, subst) in result.assoc_resolutions.values_mut() {
+            *subst = table.resolve_completely(subst.clone());
+        }
         for adjustment in result.expr_adjustments.values_mut().flatten() {
             adjustment.target = table.resolve_completely(adjustment.target.clone());
         }
@@ -537,8 +556,20 @@ impl<'a> InferenceContext<'a> {
         let data = self.db.function_data(func);
         let ctx = crate::lower::TyLoweringContext::new(self.db, &self.resolver)
             .with_impl_trait_mode(ImplTraitLoweringMode::Param);
-        let param_tys =
+        let mut param_tys =
             data.params.iter().map(|(_, type_ref)| ctx.lower_ty(type_ref)).collect::<Vec<_>>();
+        // Check if function contains a va_list, if it does then we append it to the parameter types
+        // that are collected from the function data
+        if data.is_varargs() {
+            let va_list_ty = match self.resolve_va_list() {
+                Some(va_list) => TyBuilder::adt(self.db, va_list)
+                    .fill_with_defaults(self.db, || self.table.new_type_var())
+                    .build(),
+                None => self.err_ty(),
+            };
+
+            param_tys.push(va_list_ty)
+        }
         for (ty, pat) in param_tys.into_iter().zip(self.body.params.iter()) {
             let ty = self.insert_type_vars(ty);
             let ty = self.normalize_associated_types_in(ty);
@@ -551,14 +582,17 @@ impl<'a> InferenceContext<'a> {
         } else {
             &*data.ret_type
         };
-        let return_ty = self.make_ty_with_mode(return_ty, ImplTraitLoweringMode::Opaque);
-        self.return_ty = return_ty;
 
-        if let Some(rpits) = self.db.return_type_impl_traits(func) {
+        let ctx = crate::lower::TyLoweringContext::new(self.db, &self.resolver)
+            .with_impl_trait_mode(ImplTraitLoweringMode::Opaque);
+        let return_ty = ctx.lower_ty(return_ty);
+        let return_ty = self.insert_type_vars(return_ty);
+
+        let return_ty = if let Some(rpits) = self.db.return_type_impl_traits(func) {
             // RPIT opaque types use substitution of their parent function.
             let fn_placeholders = TyBuilder::placeholder_subst(self.db, func);
-            self.return_ty = fold_tys(
-                self.return_ty.clone(),
+            fold_tys(
+                return_ty,
                 |ty, _| {
                     let opaque_ty_id = match ty.kind(Interner) {
                         TyKind::OpaqueType(opaque_ty_id, _) => *opaque_ty_id,
@@ -579,14 +613,18 @@ impl<'a> InferenceContext<'a> {
                         let (var_predicate, binders) = predicate
                             .substitute(Interner, &var_subst)
                             .into_value_and_skipped_binders();
-                        always!(binders.len(Interner) == 0); // quantified where clauses not yet handled
+                        always!(binders.is_empty(Interner)); // quantified where clauses not yet handled
                         self.push_obligation(var_predicate.cast(Interner));
                     }
                     var
                 },
                 DebruijnIndex::INNERMOST,
-            );
-        }
+            )
+        } else {
+            return_ty
+        };
+
+        self.return_ty = self.normalize_associated_types_in(return_ty);
     }
 
     fn infer_body(&mut self) {
@@ -609,8 +647,8 @@ impl<'a> InferenceContext<'a> {
         self.result.variant_resolutions.insert(id, variant);
     }
 
-    fn write_assoc_resolution(&mut self, id: ExprOrPatId, item: AssocItemId) {
-        self.result.assoc_resolutions.insert(id, item);
+    fn write_assoc_resolution(&mut self, id: ExprOrPatId, item: AssocItemId, subs: Substitution) {
+        self.result.assoc_resolutions.insert(id, (item, subs));
     }
 
     fn write_pat_ty(&mut self, pat: PatId, ty: Ty) {
@@ -621,23 +659,14 @@ impl<'a> InferenceContext<'a> {
         self.result.diagnostics.push(diagnostic);
     }
 
-    fn make_ty_with_mode(
-        &mut self,
-        type_ref: &TypeRef,
-        impl_trait_mode: ImplTraitLoweringMode,
-    ) -> Ty {
+    fn make_ty(&mut self, type_ref: &TypeRef) -> Ty {
         // FIXME use right resolver for block
-        let ctx = crate::lower::TyLoweringContext::new(self.db, &self.resolver)
-            .with_impl_trait_mode(impl_trait_mode);
+        let ctx = crate::lower::TyLoweringContext::new(self.db, &self.resolver);
         let ty = ctx.lower_ty(type_ref);
         let ty = self.insert_type_vars(ty);
         self.normalize_associated_types_in(ty)
     }
 
-    fn make_ty(&mut self, type_ref: &TypeRef) -> Ty {
-        self.make_ty_with_mode(type_ref, ImplTraitLoweringMode::Disallowed)
-    }
-
     fn err_ty(&self) -> Ty {
         self.result.standard_types.unknown.clone()
     }
@@ -656,7 +685,7 @@ impl<'a> InferenceContext<'a> {
         }
     }
 
-    /// Replaces Ty::Unknown by a new type var, so we can maybe still infer it.
+    /// Replaces `Ty::Error` by a new type var, so we can maybe still infer it.
     fn insert_type_vars_shallow(&mut self, ty: Ty) -> Ty {
         match ty.kind(Interner) {
             TyKind::Error => self.table.new_type_var(),
@@ -983,6 +1012,11 @@ impl<'a> InferenceContext<'a> {
         let trait_ = self.resolve_ops_index()?;
         self.db.trait_data(trait_).associated_type_by_name(&name![Output])
     }
+
+    fn resolve_va_list(&self) -> Option<AdtId> {
+        let struct_ = self.resolve_lang_item(name![va_list])?.as_struct()?;
+        Some(struct_.into())
+    }
 }
 
 /// When inferring an expression, we propagate downward whatever type hint we
diff --git a/crates/hir-ty/src/infer/expr.rs b/crates/hir-ty/src/infer/expr.rs
index b1f4de8260..8f9cdac378 100644
--- a/crates/hir-ty/src/infer/expr.rs
+++ b/crates/hir-ty/src/infer/expr.rs
@@ -1,13 +1,12 @@
 //! Type inference for expressions.
 
 use std::{
-    collections::hash_map::Entry,
     iter::{repeat, repeat_with},
     mem,
 };
 
 use chalk_ir::{
-    cast::Cast, fold::Shift, DebruijnIndex, GenericArgData, Mutability, TyVariableKind,
+    cast::Cast, fold::Shift, DebruijnIndex, GenericArgData, Mutability, TyKind, TyVariableKind,
 };
 use hir_def::{
     expr::{
@@ -35,8 +34,8 @@ use crate::{
     primitive::{self, UintTy},
     static_lifetime, to_chalk_trait_id,
     utils::{generics, Generics},
-    AdtId, Binders, CallableDefId, FnPointer, FnSig, FnSubst, Interner, Rawness, Scalar,
-    Substitution, TraitRef, Ty, TyBuilder, TyExt, TyKind,
+    Adjust, Adjustment, AdtId, AutoBorrow, Binders, CallableDefId, FnPointer, FnSig, FnSubst,
+    Interner, Rawness, Scalar, Substitution, TraitRef, Ty, TyBuilder, TyExt,
 };
 
 use super::{
@@ -152,11 +151,20 @@ impl<'a> InferenceContext<'a> {
                 .1
             }
             Expr::TryBlock { body } => {
-                self.with_breakable_ctx(BreakableKind::Border, self.err_ty(), None, |this| {
-                    let _inner = this.infer_expr(*body, expected);
+                // The type that is returned from the try block
+                let try_ty = self.table.new_type_var();
+                if let Some(ty) = expected.only_has_type(&mut self.table) {
+                    self.unify(&try_ty, &ty);
+                }
+
+                // The ok-ish type that is expected from the last expression
+                let ok_ty = self.resolve_associated_type(try_ty.clone(), self.resolve_ops_try_ok());
+
+                self.with_breakable_ctx(BreakableKind::Block, ok_ty.clone(), None, |this| {
+                    this.infer_expr(*body, &Expectation::has_type(ok_ty));
                 });
-                // FIXME should be std::result::Result<{inner}, _>
-                self.err_ty()
+
+                try_ty
             }
             Expr::Async { body } => {
                 let ret_ty = self.table.new_type_var();
@@ -326,6 +334,7 @@ impl<'a> InferenceContext<'a> {
                 let (param_tys, ret_ty) = match res {
                     Some(res) => {
                         let adjustments = auto_deref_adjust_steps(&derefs);
+                        // FIXME: Handle call adjustments for Fn/FnMut
                         self.write_expr_adj(*callee, adjustments);
                         res
                     }
@@ -465,6 +474,12 @@ impl<'a> InferenceContext<'a> {
                     TyKind::Error.intern(Interner)
                 }
             }
+            Expr::Yeet { expr } => {
+                if let &Some(expr) = expr {
+                    self.infer_expr_inner(expr, &Expectation::None);
+                }
+                TyKind::Never.intern(Interner)
+            }
             Expr::RecordLit { path, fields, spread, .. } => {
                 let (ty, def_id) = self.resolve_variant(path.as_deref(), false);
                 if let Some(variant) = def_id {
@@ -506,6 +521,7 @@ impl<'a> InferenceContext<'a> {
                 let receiver_ty = self.infer_expr_inner(*expr, &Expectation::none());
 
                 let mut autoderef = Autoderef::new(&mut self.table, receiver_ty);
+                let mut private_field = None;
                 let ty = autoderef.by_ref().find_map(|(derefed_ty, _)| {
                     let (field_id, parameters) = match derefed_ty.kind(Interner) {
                         TyKind::Tuple(_, substs) => {
@@ -532,13 +548,8 @@ impl<'a> InferenceContext<'a> {
                     let is_visible = self.db.field_visibilities(field_id.parent)[field_id.local_id]
                         .is_visible_from(self.db.upcast(), self.resolver.module());
                     if !is_visible {
-                        // Write down the first field resolution even if it is not visible
-                        // This aids IDE features for private fields like goto def and in
-                        // case of autoderef finding an applicable field, this will be
-                        // overwritten in a following cycle
-                        if let Entry::Vacant(entry) = self.result.field_resolutions.entry(tgt_expr)
-                        {
-                            entry.insert(field_id);
+                        if private_field.is_none() {
+                            private_field = Some(field_id);
                         }
                         return None;
                     }
@@ -557,7 +568,17 @@ impl<'a> InferenceContext<'a> {
                         let ty = self.normalize_associated_types_in(ty);
                         ty
                     }
-                    _ => self.err_ty(),
+                    _ => {
+                        // Write down the first private field resolution if we found no field
+                        // This aids IDE features for private fields like goto def
+                        if let Some(field) = private_field {
+                            self.result.field_resolutions.insert(tgt_expr, field);
+                            self.result
+                                .diagnostics
+                                .push(InferenceDiagnostic::PrivateField { expr: tgt_expr, field });
+                        }
+                        self.err_ty()
+                    }
                 };
                 ty
             }
@@ -940,7 +961,7 @@ impl<'a> InferenceContext<'a> {
             Expr::RecordLit { path, fields, .. } => {
                 let subs = fields.iter().map(|f| (f.name.clone(), f.expr));
 
-                self.infer_record_pat_like(path.as_deref(), &rhs_ty, (), lhs.into(), subs)
+                self.infer_record_pat_like(path.as_deref(), &rhs_ty, (), lhs, subs)
             }
             Expr::Underscore => rhs_ty.clone(),
             _ => {
@@ -1018,14 +1039,38 @@ impl<'a> InferenceContext<'a> {
         self.infer_expr_coerce(rhs, &Expectation::has_type(rhs_ty.clone()));
 
         let ret_ty = match method_ty.callable_sig(self.db) {
-            Some(sig) => sig.ret().clone(),
+            Some(sig) => {
+                let p_left = &sig.params()[0];
+                if matches!(op, BinaryOp::CmpOp(..) | BinaryOp::Assignment { .. }) {
+                    if let &TyKind::Ref(mtbl, _, _) = p_left.kind(Interner) {
+                        self.write_expr_adj(
+                            lhs,
+                            vec![Adjustment {
+                                kind: Adjust::Borrow(AutoBorrow::Ref(mtbl)),
+                                target: p_left.clone(),
+                            }],
+                        );
+                    }
+                }
+                let p_right = &sig.params()[1];
+                if matches!(op, BinaryOp::CmpOp(..)) {
+                    if let &TyKind::Ref(mtbl, _, _) = p_right.kind(Interner) {
+                        self.write_expr_adj(
+                            rhs,
+                            vec![Adjustment {
+                                kind: Adjust::Borrow(AutoBorrow::Ref(mtbl)),
+                                target: p_right.clone(),
+                            }],
+                        );
+                    }
+                }
+                sig.ret().clone()
+            }
             None => self.err_ty(),
         };
 
         let ret_ty = self.normalize_associated_types_in(ret_ty);
 
-        // FIXME: record autoref adjustments
-
         // use knowledge of built-in binary ops, which can sometimes help inference
         if let Some(builtin_rhs) = self.builtin_binary_op_rhs_expectation(op, lhs_ty.clone()) {
             self.unify(&builtin_rhs, &rhs_ty);
@@ -1122,20 +1167,26 @@ impl<'a> InferenceContext<'a> {
         let traits_in_scope = self.resolver.traits_in_scope(self.db.upcast());
 
         let resolved = method_resolution::lookup_method(
-            &canonicalized_receiver.value,
             self.db,
+            &canonicalized_receiver.value,
             self.trait_env.clone(),
             &traits_in_scope,
             VisibleFromModule::Filter(self.resolver.module()),
             method_name,
         );
         let (receiver_ty, method_ty, substs) = match resolved {
-            Some((adjust, func)) => {
+            Some((adjust, func, visible)) => {
                 let (ty, adjustments) = adjust.apply(&mut self.table, receiver_ty);
                 let generics = generics(self.db.upcast(), func.into());
                 let substs = self.substs_for_method_call(generics, generic_args);
                 self.write_expr_adj(receiver, adjustments);
                 self.write_method_resolution(tgt_expr, func, substs.clone());
+                if !visible {
+                    self.push_diagnostic(InferenceDiagnostic::PrivateAssocItem {
+                        id: tgt_expr.into(),
+                        item: func.into(),
+                    })
+                }
                 (ty, self.db.value_ty(func.into()), substs)
             }
             None => (
@@ -1309,7 +1360,7 @@ impl<'a> InferenceContext<'a> {
                             ty,
                             c,
                             ParamLoweringMode::Placeholder,
-                            || generics(this.db.upcast(), (&this.resolver).generic_def().unwrap()),
+                            || generics(this.db.upcast(), this.resolver.generic_def().unwrap()),
                             DebruijnIndex::INNERMOST,
                         )
                     },
diff --git a/crates/hir-ty/src/infer/pat.rs b/crates/hir-ty/src/infer/pat.rs
index 53259d66de..f154dac8e8 100644
--- a/crates/hir-ty/src/infer/pat.rs
+++ b/crates/hir-ty/src/infer/pat.rs
@@ -153,7 +153,7 @@ impl<'a> InferenceContext<'a> {
     ) -> Ty {
         let mut expected = self.resolve_ty_shallow(expected);
 
-        if is_non_ref_pat(&self.body, pat) {
+        if is_non_ref_pat(self.body, pat) {
             let mut pat_adjustments = Vec::new();
             while let Some((inner, _lifetime, mutability)) = expected.as_reference() {
                 pat_adjustments.push(expected.clone());
@@ -220,7 +220,7 @@ impl<'a> InferenceContext<'a> {
                 ),
             Pat::Record { path: p, args: fields, ellipsis: _ } => {
                 let subs = fields.iter().map(|f| (f.name.clone(), f.pat));
-                self.infer_record_pat_like(p.as_deref(), &expected, default_bm, pat.into(), subs)
+                self.infer_record_pat_like(p.as_deref(), &expected, default_bm, pat, subs)
             }
             Pat::Path(path) => {
                 // FIXME use correct resolver for the surrounding expression
diff --git a/crates/hir-ty/src/infer/path.rs b/crates/hir-ty/src/infer/path.rs
index ebe9d6fb5e..8bd17c0f39 100644
--- a/crates/hir-ty/src/infer/path.rs
+++ b/crates/hir-ty/src/infer/path.rs
@@ -7,13 +7,15 @@ use hir_def::{
     AdtId, AssocItemId, EnumVariantId, ItemContainerId, Lookup,
 };
 use hir_expand::name::Name;
+use stdx::never;
 
 use crate::{
     builder::ParamKind,
     consteval,
     method_resolution::{self, VisibleFromModule},
     utils::generics,
-    Interner, Substitution, TraitRefExt, Ty, TyBuilder, TyExt, TyKind, ValueTyDefId,
+    InferenceDiagnostic, Interner, Substitution, TraitRefExt, Ty, TyBuilder, TyExt, TyKind,
+    ValueTyDefId,
 };
 
 use super::{ExprOrPatId, InferenceContext, TraitRef};
@@ -212,7 +214,7 @@ impl<'a> InferenceContext<'a> {
             AssocItemId::TypeAliasId(_) => unreachable!(),
         };
 
-        self.write_assoc_resolution(id, item);
+        self.write_assoc_resolution(id, item, trait_ref.substitution.clone());
         Some((def, Some(trait_ref.substitution)))
     }
 
@@ -233,7 +235,8 @@ impl<'a> InferenceContext<'a> {
         let canonical_ty = self.canonicalize(ty.clone());
         let traits_in_scope = self.resolver.traits_in_scope(self.db.upcast());
 
-        method_resolution::iterate_method_candidates(
+        let mut not_visible = None;
+        let res = method_resolution::iterate_method_candidates(
             &canonical_ty.value,
             self.db,
             self.table.trait_env.clone(),
@@ -241,7 +244,7 @@ impl<'a> InferenceContext<'a> {
             VisibleFromModule::Filter(self.resolver.module()),
             Some(name),
             method_resolution::LookupMode::Path,
-            move |_ty, item| {
+            |_ty, item, visible| {
                 let (def, container) = match item {
                     AssocItemId::FunctionId(f) => {
                         (ValueNs::FunctionId(f), f.lookup(self.db.upcast()).container)
@@ -259,7 +262,7 @@ impl<'a> InferenceContext<'a> {
                         let impl_self_ty =
                             self.db.impl_self_ty(impl_id).substitute(Interner, &impl_substs);
                         self.unify(&impl_self_ty, &ty);
-                        Some(impl_substs)
+                        impl_substs
                     }
                     ItemContainerId::TraitId(trait_) => {
                         // we're picking this method
@@ -268,15 +271,32 @@ impl<'a> InferenceContext<'a> {
                             .fill_with_inference_vars(&mut self.table)
                             .build();
                         self.push_obligation(trait_ref.clone().cast(Interner));
-                        Some(trait_ref.substitution)
+                        trait_ref.substitution
+                    }
+                    ItemContainerId::ModuleId(_) | ItemContainerId::ExternBlockId(_) => {
+                        never!("assoc item contained in module/extern block");
+                        return None;
                     }
-                    ItemContainerId::ModuleId(_) | ItemContainerId::ExternBlockId(_) => None,
                 };
 
-                self.write_assoc_resolution(id, item);
-                Some((def, substs))
+                if visible {
+                    Some((def, item, Some(substs), true))
+                } else {
+                    if not_visible.is_none() {
+                        not_visible = Some((def, item, Some(substs), false));
+                    }
+                    None
+                }
             },
-        )
+        );
+        let res = res.or(not_visible);
+        if let Some((_, item, Some(ref substs), visible)) = res {
+            self.write_assoc_resolution(id, item, substs.clone());
+            if !visible {
+                self.push_diagnostic(InferenceDiagnostic::PrivateAssocItem { id, item })
+            }
+        }
+        res.map(|(def, _, substs, _)| (def, substs))
     }
 
     fn resolve_enum_variant_on_ty(
diff --git a/crates/hir-ty/src/infer/unify.rs b/crates/hir-ty/src/infer/unify.rs
index 12f45f00f9..e7ddd1591f 100644
--- a/crates/hir-ty/src/infer/unify.rs
+++ b/crates/hir-ty/src/infer/unify.rs
@@ -1,6 +1,6 @@
 //! Unification and canonicalization logic.
 
-use std::{fmt, mem, sync::Arc};
+use std::{fmt, iter, mem, sync::Arc};
 
 use chalk_ir::{
     cast::Cast, fold::TypeFoldable, interner::HasInterner, zip::Zip, CanonicalVarKind, FloatTy,
@@ -128,9 +128,13 @@ pub(crate) fn unify(
     ))
 }
 
-#[derive(Copy, Clone, Debug)]
-pub(crate) struct TypeVariableData {
-    diverging: bool,
+bitflags::bitflags! {
+    #[derive(Default)]
+    pub(crate) struct TypeVariableFlags: u8 {
+        const DIVERGING = 1 << 0;
+        const INTEGER = 1 << 1;
+        const FLOAT = 1 << 2;
+    }
 }
 
 type ChalkInferenceTable = chalk_solve::infer::InferenceTable<Interner>;
@@ -140,14 +144,14 @@ pub(crate) struct InferenceTable<'a> {
     pub(crate) db: &'a dyn HirDatabase,
     pub(crate) trait_env: Arc<TraitEnvironment>,
     var_unification_table: ChalkInferenceTable,
-    type_variable_table: Vec<TypeVariableData>,
+    type_variable_table: Vec<TypeVariableFlags>,
     pending_obligations: Vec<Canonicalized<InEnvironment<Goal>>>,
 }
 
 pub(crate) struct InferenceTableSnapshot {
     var_table_snapshot: chalk_solve::infer::InferenceSnapshot<Interner>,
     pending_obligations: Vec<Canonicalized<InEnvironment<Goal>>>,
-    type_variable_table_snapshot: Vec<TypeVariableData>,
+    type_variable_table_snapshot: Vec<TypeVariableFlags>,
 }
 
 impl<'a> InferenceTable<'a> {
@@ -169,19 +173,19 @@ impl<'a> InferenceTable<'a> {
     /// result.
     pub(super) fn propagate_diverging_flag(&mut self) {
         for i in 0..self.type_variable_table.len() {
-            if !self.type_variable_table[i].diverging {
+            if !self.type_variable_table[i].contains(TypeVariableFlags::DIVERGING) {
                 continue;
             }
             let v = InferenceVar::from(i as u32);
             let root = self.var_unification_table.inference_var_root(v);
             if let Some(data) = self.type_variable_table.get_mut(root.index() as usize) {
-                data.diverging = true;
+                *data |= TypeVariableFlags::DIVERGING;
             }
         }
     }
 
     pub(super) fn set_diverging(&mut self, iv: InferenceVar, diverging: bool) {
-        self.type_variable_table[iv.index() as usize].diverging = diverging;
+        self.type_variable_table[iv.index() as usize].set(TypeVariableFlags::DIVERGING, diverging);
     }
 
     fn fallback_value(&self, iv: InferenceVar, kind: TyVariableKind) -> Ty {
@@ -189,7 +193,7 @@ impl<'a> InferenceTable<'a> {
             _ if self
                 .type_variable_table
                 .get(iv.index() as usize)
-                .map_or(false, |data| data.diverging) =>
+                .map_or(false, |data| data.contains(TypeVariableFlags::DIVERGING)) =>
             {
                 TyKind::Never
             }
@@ -247,10 +251,8 @@ impl<'a> InferenceTable<'a> {
     }
 
     fn extend_type_variable_table(&mut self, to_index: usize) {
-        self.type_variable_table.extend(
-            (0..1 + to_index - self.type_variable_table.len())
-                .map(|_| TypeVariableData { diverging: false }),
-        );
+        let count = to_index - self.type_variable_table.len() + 1;
+        self.type_variable_table.extend(iter::repeat(TypeVariableFlags::default()).take(count));
     }
 
     fn new_var(&mut self, kind: TyVariableKind, diverging: bool) -> Ty {
@@ -258,7 +260,15 @@ impl<'a> InferenceTable<'a> {
         // Chalk might have created some type variables for its own purposes that we don't know about...
         self.extend_type_variable_table(var.index() as usize);
         assert_eq!(var.index() as usize, self.type_variable_table.len() - 1);
-        self.type_variable_table[var.index() as usize].diverging = diverging;
+        let flags = self.type_variable_table.get_mut(var.index() as usize).unwrap();
+        if diverging {
+            *flags |= TypeVariableFlags::DIVERGING;
+        }
+        if matches!(kind, TyVariableKind::Integer) {
+            *flags |= TypeVariableFlags::INTEGER;
+        } else if matches!(kind, TyVariableKind::Float) {
+            *flags |= TypeVariableFlags::FLOAT;
+        }
         var.to_ty_with_kind(Interner, kind)
     }
 
@@ -340,6 +350,51 @@ impl<'a> InferenceTable<'a> {
         self.resolve_with_fallback(t, &|_, _, d, _| d)
     }
 
+    /// Apply a fallback to unresolved scalar types. Integer type variables and float type
+    /// variables are replaced with i32 and f64, respectively.
+    ///
+    /// This method is only intended to be called just before returning inference results (i.e. in
+    /// `InferenceContext::resolve_all()`).
+    ///
+    /// FIXME: This method currently doesn't apply fallback to unconstrained general type variables
+    /// whereas rustc replaces them with `()` or `!`.
+    pub(super) fn fallback_if_possible(&mut self) {
+        let int_fallback = TyKind::Scalar(Scalar::Int(IntTy::I32)).intern(Interner);
+        let float_fallback = TyKind::Scalar(Scalar::Float(FloatTy::F64)).intern(Interner);
+
+        let scalar_vars: Vec<_> = self
+            .type_variable_table
+            .iter()
+            .enumerate()
+            .filter_map(|(index, flags)| {
+                let kind = if flags.contains(TypeVariableFlags::INTEGER) {
+                    TyVariableKind::Integer
+                } else if flags.contains(TypeVariableFlags::FLOAT) {
+                    TyVariableKind::Float
+                } else {
+                    return None;
+                };
+
+                // FIXME: This is not really the nicest way to get `InferenceVar`s. Can we get them
+                // without directly constructing them from `index`?
+                let var = InferenceVar::from(index as u32).to_ty(Interner, kind);
+                Some(var)
+            })
+            .collect();
+
+        for var in scalar_vars {
+            let maybe_resolved = self.resolve_ty_shallow(&var);
+            if let TyKind::InferenceVar(_, kind) = maybe_resolved.kind(Interner) {
+                let fallback = match kind {
+                    TyVariableKind::Integer => &int_fallback,
+                    TyVariableKind::Float => &float_fallback,
+                    TyVariableKind::General => unreachable!(),
+                };
+                self.unify(&var, fallback);
+            }
+        }
+    }
+
     /// Unify two relatable values (e.g. `Ty`) and register new trait goals that arise from that.
     pub(crate) fn unify<T: ?Sized + Zip<Interner>>(&mut self, ty1: &T, ty2: &T) -> bool {
         let result = match self.try_unify(ty1, ty2) {
diff --git a/crates/hir-ty/src/interner.rs b/crates/hir-ty/src/interner.rs
index ca76e08fdd..441503a300 100644
--- a/crates/hir-ty/src/interner.rs
+++ b/crates/hir-ty/src/interner.rs
@@ -143,7 +143,7 @@ impl chalk_ir::interner::Interner for Interner {
 
     fn debug_goal(goal: &Goal<Interner>, fmt: &mut fmt::Formatter<'_>) -> Option<fmt::Result> {
         let goal_data = goal.data(Interner);
-        Some(write!(fmt, "{:?}", goal_data))
+        Some(write!(fmt, "{goal_data:?}"))
     }
 
     fn debug_goals(
@@ -228,7 +228,7 @@ impl chalk_ir::interner::Interner for Interner {
         Interned::new(InternedWrapper(chalk_ir::TyData { kind, flags }))
     }
 
-    fn ty_data<'a>(self, ty: &'a Self::InternedType) -> &'a chalk_ir::TyData<Self> {
+    fn ty_data(self, ty: &Self::InternedType) -> &chalk_ir::TyData<Self> {
         &ty.0
     }
 
@@ -236,10 +236,7 @@ impl chalk_ir::interner::Interner for Interner {
         Interned::new(InternedWrapper(lifetime))
     }
 
-    fn lifetime_data<'a>(
-        self,
-        lifetime: &'a Self::InternedLifetime,
-    ) -> &'a chalk_ir::LifetimeData<Self> {
+    fn lifetime_data(self, lifetime: &Self::InternedLifetime) -> &chalk_ir::LifetimeData<Self> {
         &lifetime.0
     }
 
@@ -247,7 +244,7 @@ impl chalk_ir::interner::Interner for Interner {
         Interned::new(InternedWrapper(constant))
     }
 
-    fn const_data<'a>(self, constant: &'a Self::InternedConst) -> &'a chalk_ir::ConstData<Self> {
+    fn const_data(self, constant: &Self::InternedConst) -> &chalk_ir::ConstData<Self> {
         &constant.0
     }
 
@@ -267,10 +264,10 @@ impl chalk_ir::interner::Interner for Interner {
         parameter
     }
 
-    fn generic_arg_data<'a>(
+    fn generic_arg_data(
         self,
-        parameter: &'a Self::InternedGenericArg,
-    ) -> &'a chalk_ir::GenericArgData<Self> {
+        parameter: &Self::InternedGenericArg,
+    ) -> &chalk_ir::GenericArgData<Self> {
         parameter
     }
 
@@ -285,11 +282,11 @@ impl chalk_ir::interner::Interner for Interner {
         data.into_iter().collect()
     }
 
-    fn goal_data<'a>(self, goal: &'a Self::InternedGoal) -> &'a GoalData<Self> {
+    fn goal_data(self, goal: &Self::InternedGoal) -> &GoalData<Self> {
         goal
     }
 
-    fn goals_data<'a>(self, goals: &'a Self::InternedGoals) -> &'a [Goal<Interner>] {
+    fn goals_data(self, goals: &Self::InternedGoals) -> &[Goal<Interner>] {
         goals
     }
 
@@ -300,10 +297,7 @@ impl chalk_ir::interner::Interner for Interner {
         Ok(Interned::new(InternedWrapper(data.into_iter().collect::<Result<_, _>>()?)))
     }
 
-    fn substitution_data<'a>(
-        self,
-        substitution: &'a Self::InternedSubstitution,
-    ) -> &'a [GenericArg] {
+    fn substitution_data(self, substitution: &Self::InternedSubstitution) -> &[GenericArg] {
         &substitution.as_ref().0
     }
 
@@ -314,10 +308,10 @@ impl chalk_ir::interner::Interner for Interner {
         data
     }
 
-    fn program_clause_data<'a>(
+    fn program_clause_data(
         self,
-        clause: &'a Self::InternedProgramClause,
-    ) -> &'a chalk_ir::ProgramClauseData<Self> {
+        clause: &Self::InternedProgramClause,
+    ) -> &chalk_ir::ProgramClauseData<Self> {
         clause
     }
 
@@ -328,10 +322,10 @@ impl chalk_ir::interner::Interner for Interner {
         Ok(Interned::new(InternedWrapper(data.into_iter().collect::<Result<_, _>>()?)))
     }
 
-    fn program_clauses_data<'a>(
+    fn program_clauses_data(
         self,
-        clauses: &'a Self::InternedProgramClauses,
-    ) -> &'a [chalk_ir::ProgramClause<Self>] {
+        clauses: &Self::InternedProgramClauses,
+    ) -> &[chalk_ir::ProgramClause<Self>] {
         clauses
     }
 
@@ -342,10 +336,10 @@ impl chalk_ir::interner::Interner for Interner {
         Ok(Interned::new(InternedWrapper(data.into_iter().collect::<Result<_, _>>()?)))
     }
 
-    fn quantified_where_clauses_data<'a>(
+    fn quantified_where_clauses_data(
         self,
-        clauses: &'a Self::InternedQuantifiedWhereClauses,
-    ) -> &'a [chalk_ir::QuantifiedWhereClause<Self>] {
+        clauses: &Self::InternedQuantifiedWhereClauses,
+    ) -> &[chalk_ir::QuantifiedWhereClause<Self>] {
         clauses
     }
 
@@ -356,10 +350,10 @@ impl chalk_ir::interner::Interner for Interner {
         Ok(Interned::new(InternedWrapper(data.into_iter().collect::<Result<_, _>>()?)))
     }
 
-    fn variable_kinds_data<'a>(
+    fn variable_kinds_data(
         self,
-        parameter_kinds: &'a Self::InternedVariableKinds,
-    ) -> &'a [chalk_ir::VariableKind<Self>] {
+        parameter_kinds: &Self::InternedVariableKinds,
+    ) -> &[chalk_ir::VariableKind<Self>] {
         &parameter_kinds.as_ref().0
     }
 
@@ -370,10 +364,10 @@ impl chalk_ir::interner::Interner for Interner {
         Ok(Interned::new(InternedWrapper(data.into_iter().collect::<Result<_, _>>()?)))
     }
 
-    fn canonical_var_kinds_data<'a>(
+    fn canonical_var_kinds_data(
         self,
-        canonical_var_kinds: &'a Self::InternedCanonicalVarKinds,
-    ) -> &'a [chalk_ir::CanonicalVarKind<Self>] {
+        canonical_var_kinds: &Self::InternedCanonicalVarKinds,
+    ) -> &[chalk_ir::CanonicalVarKind<Self>] {
         canonical_var_kinds
     }
 
@@ -384,10 +378,10 @@ impl chalk_ir::interner::Interner for Interner {
         data.into_iter().collect()
     }
 
-    fn constraints_data<'a>(
+    fn constraints_data(
         self,
-        constraints: &'a Self::InternedConstraints,
-    ) -> &'a [chalk_ir::InEnvironment<chalk_ir::Constraint<Self>>] {
+        constraints: &Self::InternedConstraints,
+    ) -> &[chalk_ir::InEnvironment<chalk_ir::Constraint<Self>>] {
         constraints
     }
     fn debug_closure_id(
@@ -410,10 +404,7 @@ impl chalk_ir::interner::Interner for Interner {
         Ok(Interned::new(InternedWrapper(data.into_iter().collect::<Result<_, _>>()?)))
     }
 
-    fn variances_data<'a>(
-        self,
-        variances: &'a Self::InternedVariances,
-    ) -> &'a [chalk_ir::Variance] {
+    fn variances_data(self, variances: &Self::InternedVariances) -> &[chalk_ir::Variance] {
         variances
     }
 }
diff --git a/crates/hir-ty/src/lang_items.rs b/crates/hir-ty/src/lang_items.rs
new file mode 100644
index 0000000000..afc54e729f
--- /dev/null
+++ b/crates/hir-ty/src/lang_items.rs
@@ -0,0 +1,20 @@
+//! Functions to detect special lang items
+
+use hir_def::{AdtId, HasModule};
+use hir_expand::name;
+
+use crate::db::HirDatabase;
+
+pub fn is_box(adt: AdtId, db: &dyn HirDatabase) -> bool {
+    let owned_box = name![owned_box].to_smol_str();
+    let krate = adt.module(db.upcast()).krate();
+    let box_adt = db.lang_item(krate, owned_box).and_then(|it| it.as_struct()).map(AdtId::from);
+    Some(adt) == box_adt
+}
+
+pub fn is_unsafe_cell(adt: AdtId, db: &dyn HirDatabase) -> bool {
+    let owned_box = name![unsafe_cell].to_smol_str();
+    let krate = adt.module(db.upcast()).krate();
+    let box_adt = db.lang_item(krate, owned_box).and_then(|it| it.as_struct()).map(AdtId::from);
+    Some(adt) == box_adt
+}
diff --git a/crates/hir-ty/src/layout.rs b/crates/hir-ty/src/layout.rs
new file mode 100644
index 0000000000..7a1cca3143
--- /dev/null
+++ b/crates/hir-ty/src/layout.rs
@@ -0,0 +1,279 @@
+//! Compute the binary representation of a type
+
+use std::sync::Arc;
+
+use base_db::CrateId;
+use chalk_ir::{AdtId, TyKind};
+use hir_def::{
+    layout::{
+        Abi, FieldsShape, Integer, Layout, LayoutCalculator, LayoutError, Primitive, ReprOptions,
+        RustcEnumVariantIdx, Scalar, Size, StructKind, TargetDataLayout, Variants, WrappingRange,
+    },
+    LocalFieldId,
+};
+use stdx::never;
+
+use crate::{db::HirDatabase, Interner, Substitution, Ty};
+
+use self::adt::struct_variant_idx;
+pub use self::{
+    adt::{layout_of_adt_query, layout_of_adt_recover},
+    target::target_data_layout_query,
+};
+
+macro_rules! user_error {
+    ($x: expr) => {
+        return Err(LayoutError::UserError(format!($x)))
+    };
+}
+
+mod adt;
+mod target;
+
+struct LayoutCx<'a> {
+    db: &'a dyn HirDatabase,
+    krate: CrateId,
+}
+
+impl LayoutCalculator for LayoutCx<'_> {
+    type TargetDataLayoutRef = Arc<TargetDataLayout>;
+
+    fn delay_bug(&self, txt: &str) {
+        never!("{}", txt);
+    }
+
+    fn current_data_layout(&self) -> Arc<TargetDataLayout> {
+        self.db.target_data_layout(self.krate)
+    }
+}
+
+fn scalar_unit(dl: &TargetDataLayout, value: Primitive) -> Scalar {
+    Scalar::Initialized { value, valid_range: WrappingRange::full(value.size(dl)) }
+}
+
+fn scalar(dl: &TargetDataLayout, value: Primitive) -> Layout {
+    Layout::scalar(dl, scalar_unit(dl, value))
+}
+
+pub fn layout_of_ty(db: &dyn HirDatabase, ty: &Ty, krate: CrateId) -> Result<Layout, LayoutError> {
+    let cx = LayoutCx { db, krate };
+    let dl = &*cx.current_data_layout();
+    Ok(match ty.kind(Interner) {
+        TyKind::Adt(AdtId(def), subst) => db.layout_of_adt(*def, subst.clone())?,
+        TyKind::Scalar(s) => match s {
+            chalk_ir::Scalar::Bool => Layout::scalar(
+                dl,
+                Scalar::Initialized {
+                    value: Primitive::Int(Integer::I8, false),
+                    valid_range: WrappingRange { start: 0, end: 1 },
+                },
+            ),
+            chalk_ir::Scalar::Char => Layout::scalar(
+                dl,
+                Scalar::Initialized {
+                    value: Primitive::Int(Integer::I32, false),
+                    valid_range: WrappingRange { start: 0, end: 0x10FFFF },
+                },
+            ),
+            chalk_ir::Scalar::Int(i) => scalar(
+                dl,
+                Primitive::Int(
+                    match i {
+                        chalk_ir::IntTy::Isize => dl.ptr_sized_integer(),
+                        chalk_ir::IntTy::I8 => Integer::I8,
+                        chalk_ir::IntTy::I16 => Integer::I16,
+                        chalk_ir::IntTy::I32 => Integer::I32,
+                        chalk_ir::IntTy::I64 => Integer::I64,
+                        chalk_ir::IntTy::I128 => Integer::I128,
+                    },
+                    true,
+                ),
+            ),
+            chalk_ir::Scalar::Uint(i) => scalar(
+                dl,
+                Primitive::Int(
+                    match i {
+                        chalk_ir::UintTy::Usize => dl.ptr_sized_integer(),
+                        chalk_ir::UintTy::U8 => Integer::I8,
+                        chalk_ir::UintTy::U16 => Integer::I16,
+                        chalk_ir::UintTy::U32 => Integer::I32,
+                        chalk_ir::UintTy::U64 => Integer::I64,
+                        chalk_ir::UintTy::U128 => Integer::I128,
+                    },
+                    false,
+                ),
+            ),
+            chalk_ir::Scalar::Float(f) => scalar(
+                dl,
+                match f {
+                    chalk_ir::FloatTy::F32 => Primitive::F32,
+                    chalk_ir::FloatTy::F64 => Primitive::F64,
+                },
+            ),
+        },
+        TyKind::Tuple(len, tys) => {
+            let kind = if *len == 0 { StructKind::AlwaysSized } else { StructKind::MaybeUnsized };
+
+            let fields = tys
+                .iter(Interner)
+                .map(|k| layout_of_ty(db, k.assert_ty_ref(Interner), krate))
+                .collect::<Result<Vec<_>, _>>()?;
+            let fields = fields.iter().collect::<Vec<_>>();
+            let fields = fields.iter().collect::<Vec<_>>();
+            cx.univariant(dl, &fields, &ReprOptions::default(), kind).ok_or(LayoutError::Unknown)?
+        }
+        TyKind::Array(element, count) => {
+            let count = match count.data(Interner).value {
+                chalk_ir::ConstValue::Concrete(c) => match c.interned {
+                    hir_def::type_ref::ConstScalar::Int(x) => x as u64,
+                    hir_def::type_ref::ConstScalar::UInt(x) => x as u64,
+                    hir_def::type_ref::ConstScalar::Unknown => {
+                        user_error!("unknown const generic parameter")
+                    }
+                    _ => user_error!("mismatched type of const generic parameter"),
+                },
+                _ => return Err(LayoutError::HasPlaceholder),
+            };
+            let element = layout_of_ty(db, element, krate)?;
+            let size = element.size.checked_mul(count, dl).ok_or(LayoutError::SizeOverflow)?;
+
+            let abi = if count != 0 && matches!(element.abi, Abi::Uninhabited) {
+                Abi::Uninhabited
+            } else {
+                Abi::Aggregate { sized: true }
+            };
+
+            let largest_niche = if count != 0 { element.largest_niche } else { None };
+
+            Layout {
+                variants: Variants::Single { index: struct_variant_idx() },
+                fields: FieldsShape::Array { stride: element.size, count },
+                abi,
+                largest_niche,
+                align: element.align,
+                size,
+            }
+        }
+        TyKind::Slice(element) => {
+            let element = layout_of_ty(db, element, krate)?;
+            Layout {
+                variants: Variants::Single { index: struct_variant_idx() },
+                fields: FieldsShape::Array { stride: element.size, count: 0 },
+                abi: Abi::Aggregate { sized: false },
+                largest_niche: None,
+                align: element.align,
+                size: Size::ZERO,
+            }
+        }
+        // Potentially-wide pointers.
+        TyKind::Ref(_, _, pointee) | TyKind::Raw(_, pointee) => {
+            let mut data_ptr = scalar_unit(dl, Primitive::Pointer);
+            if matches!(ty.kind(Interner), TyKind::Ref(..)) {
+                data_ptr.valid_range_mut().start = 1;
+            }
+
+            // let pointee = tcx.normalize_erasing_regions(param_env, pointee);
+            // if pointee.is_sized(tcx.at(DUMMY_SP), param_env) {
+            //     return Ok(tcx.intern_layout(LayoutS::scalar(cx, data_ptr)));
+            // }
+
+            let unsized_part = struct_tail_erasing_lifetimes(db, pointee.clone());
+            let metadata = match unsized_part.kind(Interner) {
+                TyKind::Slice(_) | TyKind::Str => {
+                    scalar_unit(dl, Primitive::Int(dl.ptr_sized_integer(), false))
+                }
+                TyKind::Dyn(..) => {
+                    let mut vtable = scalar_unit(dl, Primitive::Pointer);
+                    vtable.valid_range_mut().start = 1;
+                    vtable
+                }
+                _ => {
+                    // pointee is sized
+                    return Ok(Layout::scalar(dl, data_ptr));
+                }
+            };
+
+            // Effectively a (ptr, meta) tuple.
+            cx.scalar_pair(data_ptr, metadata)
+        }
+        TyKind::FnDef(_, _) => layout_of_unit(&cx, dl)?,
+        TyKind::Str => Layout {
+            variants: Variants::Single { index: struct_variant_idx() },
+            fields: FieldsShape::Array { stride: Size::from_bytes(1), count: 0 },
+            abi: Abi::Aggregate { sized: false },
+            largest_niche: None,
+            align: dl.i8_align,
+            size: Size::ZERO,
+        },
+        TyKind::Never => Layout {
+            variants: Variants::Single { index: struct_variant_idx() },
+            fields: FieldsShape::Primitive,
+            abi: Abi::Uninhabited,
+            largest_niche: None,
+            align: dl.i8_align,
+            size: Size::ZERO,
+        },
+        TyKind::Dyn(_) | TyKind::Foreign(_) => {
+            let mut unit = layout_of_unit(&cx, dl)?;
+            match unit.abi {
+                Abi::Aggregate { ref mut sized } => *sized = false,
+                _ => user_error!("bug"),
+            }
+            unit
+        }
+        TyKind::Function(_) => {
+            let mut ptr = scalar_unit(dl, Primitive::Pointer);
+            ptr.valid_range_mut().start = 1;
+            Layout::scalar(dl, ptr)
+        }
+        TyKind::Closure(_, _)
+        | TyKind::OpaqueType(_, _)
+        | TyKind::Generator(_, _)
+        | TyKind::GeneratorWitness(_, _) => return Err(LayoutError::NotImplemented),
+        TyKind::AssociatedType(_, _)
+        | TyKind::Error
+        | TyKind::Alias(_)
+        | TyKind::Placeholder(_)
+        | TyKind::BoundVar(_)
+        | TyKind::InferenceVar(_, _) => return Err(LayoutError::HasPlaceholder),
+    })
+}
+
+fn layout_of_unit(cx: &LayoutCx<'_>, dl: &TargetDataLayout) -> Result<Layout, LayoutError> {
+    cx.univariant::<RustcEnumVariantIdx, &&Layout>(
+        dl,
+        &[],
+        &ReprOptions::default(),
+        StructKind::AlwaysSized,
+    )
+    .ok_or(LayoutError::Unknown)
+}
+
+fn struct_tail_erasing_lifetimes(db: &dyn HirDatabase, pointee: Ty) -> Ty {
+    match pointee.kind(Interner) {
+        TyKind::Adt(AdtId(adt), subst) => match adt {
+            &hir_def::AdtId::StructId(i) => {
+                let data = db.struct_data(i);
+                let mut it = data.variant_data.fields().iter().rev();
+                match it.next() {
+                    Some((f, _)) => field_ty(db, i.into(), f, subst),
+                    None => pointee,
+                }
+            }
+            _ => pointee,
+        },
+        _ => pointee,
+    }
+}
+
+fn field_ty(
+    db: &dyn HirDatabase,
+    def: hir_def::VariantId,
+    fd: LocalFieldId,
+    subst: &Substitution,
+) -> Ty {
+    db.field_types(def)[fd].clone().substitute(Interner, subst)
+}
+
+#[cfg(test)]
+mod tests;
diff --git a/crates/hir-ty/src/layout/adt.rs b/crates/hir-ty/src/layout/adt.rs
new file mode 100644
index 0000000000..23166a5a52
--- /dev/null
+++ b/crates/hir-ty/src/layout/adt.rs
@@ -0,0 +1,134 @@
+//! Compute the binary representation of structs, unions and enums
+
+use std::ops::Bound;
+
+use hir_def::{
+    adt::VariantData,
+    layout::{Integer, IntegerExt, Layout, LayoutCalculator, LayoutError, RustcEnumVariantIdx},
+    AdtId, EnumVariantId, HasModule, LocalEnumVariantId, VariantId,
+};
+use la_arena::RawIdx;
+use smallvec::SmallVec;
+
+use crate::{db::HirDatabase, lang_items::is_unsafe_cell, layout::field_ty, Substitution};
+
+use super::{layout_of_ty, LayoutCx};
+
+pub(crate) fn struct_variant_idx() -> RustcEnumVariantIdx {
+    RustcEnumVariantIdx(LocalEnumVariantId::from_raw(RawIdx::from(0)))
+}
+
+pub fn layout_of_adt_query(
+    db: &dyn HirDatabase,
+    def: AdtId,
+    subst: Substitution,
+) -> Result<Layout, LayoutError> {
+    let cx = LayoutCx { db, krate: def.module(db.upcast()).krate() };
+    let dl = cx.current_data_layout();
+    let handle_variant = |def: VariantId, var: &VariantData| {
+        var.fields()
+            .iter()
+            .map(|(fd, _)| layout_of_ty(db, &field_ty(db, def, fd, &subst), cx.krate))
+            .collect::<Result<Vec<_>, _>>()
+    };
+    let (variants, is_enum, is_union, repr) = match def {
+        AdtId::StructId(s) => {
+            let data = db.struct_data(s);
+            let mut r = SmallVec::<[_; 1]>::new();
+            r.push(handle_variant(s.into(), &data.variant_data)?);
+            (r, false, false, data.repr.unwrap_or_default())
+        }
+        AdtId::UnionId(id) => {
+            let data = db.union_data(id);
+            let mut r = SmallVec::new();
+            r.push(handle_variant(id.into(), &data.variant_data)?);
+            (r, false, true, data.repr.unwrap_or_default())
+        }
+        AdtId::EnumId(e) => {
+            let data = db.enum_data(e);
+            let r = data
+                .variants
+                .iter()
+                .map(|(idx, v)| {
+                    handle_variant(
+                        EnumVariantId { parent: e, local_id: idx }.into(),
+                        &v.variant_data,
+                    )
+                })
+                .collect::<Result<SmallVec<_>, _>>()?;
+            (r, true, false, data.repr.unwrap_or_default())
+        }
+    };
+    let variants =
+        variants.iter().map(|x| x.iter().collect::<Vec<_>>()).collect::<SmallVec<[_; 1]>>();
+    let variants = variants.iter().map(|x| x.iter().collect()).collect();
+    if is_union {
+        cx.layout_of_union(&repr, &variants).ok_or(LayoutError::Unknown)
+    } else {
+        cx.layout_of_struct_or_enum(
+            &repr,
+            &variants,
+            is_enum,
+            is_unsafe_cell(def, db),
+            layout_scalar_valid_range(db, def),
+            |min, max| Integer::repr_discr(&dl, &repr, min, max).unwrap_or((Integer::I8, false)),
+            variants.iter_enumerated().filter_map(|(id, _)| {
+                let AdtId::EnumId(e) = def else { return None };
+                let d = match db
+                    .const_eval_variant(EnumVariantId { parent: e, local_id: id.0 })
+                    .ok()?
+                {
+                    crate::consteval::ComputedExpr::Literal(l) => match l {
+                        hir_def::expr::Literal::Int(i, _) => i,
+                        hir_def::expr::Literal::Uint(i, _) => i as i128,
+                        _ => return None,
+                    },
+                    _ => return None,
+                };
+                Some((id, d))
+            }),
+            // FIXME: The current code for niche-filling relies on variant indices
+            // instead of actual discriminants, so enums with
+            // explicit discriminants (RFC #2363) would misbehave and we should disable
+            // niche optimization for them.
+            // The code that do it in rustc:
+            // repr.inhibit_enum_layout_opt() || def
+            //     .variants()
+            //     .iter_enumerated()
+            //     .any(|(i, v)| v.discr != ty::VariantDiscr::Relative(i.as_u32()))
+            repr.inhibit_enum_layout_opt(),
+            !is_enum
+                && variants
+                    .iter()
+                    .next()
+                    .and_then(|x| x.last().map(|x| x.is_unsized()))
+                    .unwrap_or(true),
+        )
+        .ok_or(LayoutError::SizeOverflow)
+    }
+}
+
+fn layout_scalar_valid_range(db: &dyn HirDatabase, def: AdtId) -> (Bound<u128>, Bound<u128>) {
+    let attrs = db.attrs(def.into());
+    let get = |name| {
+        let attr = attrs.by_key(name).tt_values();
+        for tree in attr {
+            if let Some(x) = tree.token_trees.first() {
+                if let Ok(x) = x.to_string().parse() {
+                    return Bound::Included(x);
+                }
+            }
+        }
+        Bound::Unbounded
+    };
+    (get("rustc_layout_scalar_valid_range_start"), get("rustc_layout_scalar_valid_range_end"))
+}
+
+pub fn layout_of_adt_recover(
+    _: &dyn HirDatabase,
+    _: &[String],
+    _: &AdtId,
+    _: &Substitution,
+) -> Result<Layout, LayoutError> {
+    user_error!("infinite sized recursive type");
+}
diff --git a/crates/hir-ty/src/layout/target.rs b/crates/hir-ty/src/layout/target.rs
new file mode 100644
index 0000000000..37b831652f
--- /dev/null
+++ b/crates/hir-ty/src/layout/target.rs
@@ -0,0 +1,36 @@
+//! Target dependent parameters needed for layouts
+
+use std::sync::Arc;
+
+use base_db::CrateId;
+use hir_def::layout::{Endian, Size, TargetDataLayout};
+
+use crate::db::HirDatabase;
+
+pub fn target_data_layout_query(db: &dyn HirDatabase, krate: CrateId) -> Arc<TargetDataLayout> {
+    let crate_graph = db.crate_graph();
+    let target_layout = &crate_graph[krate].target_layout;
+    let cfg_options = &crate_graph[krate].cfg_options;
+    Arc::new(
+        target_layout
+            .as_ref()
+            .and_then(|it| TargetDataLayout::parse_from_llvm_datalayout_string(it).ok())
+            .unwrap_or_else(|| {
+                let endian = match cfg_options.get_cfg_values("target_endian").next() {
+                    Some(x) if x.as_str() == "big" => Endian::Big,
+                    _ => Endian::Little,
+                };
+                let pointer_size = Size::from_bytes(
+                    match cfg_options.get_cfg_values("target_pointer_width").next() {
+                        Some(x) => match x.as_str() {
+                            "16" => 2,
+                            "32" => 4,
+                            _ => 8,
+                        },
+                        _ => 8,
+                    },
+                );
+                TargetDataLayout { endian, pointer_size, ..TargetDataLayout::default() }
+            }),
+    )
+}
diff --git a/crates/hir-ty/src/layout/tests.rs b/crates/hir-ty/src/layout/tests.rs
new file mode 100644
index 0000000000..53838cf41d
--- /dev/null
+++ b/crates/hir-ty/src/layout/tests.rs
@@ -0,0 +1,208 @@
+use base_db::fixture::WithFixture;
+use chalk_ir::{AdtId, TyKind};
+use hir_def::{
+    db::DefDatabase,
+    layout::{Layout, LayoutError},
+};
+
+use crate::{test_db::TestDB, Interner, Substitution};
+
+use super::layout_of_ty;
+
+fn eval_goal(ra_fixture: &str, minicore: &str) -> Result<Layout, LayoutError> {
+    // using unstable cargo features failed, fall back to using plain rustc
+    let mut cmd = std::process::Command::new("rustc");
+    cmd.args(["-Z", "unstable-options", "--print", "target-spec-json"]).env("RUSTC_BOOTSTRAP", "1");
+    let output = cmd.output().unwrap();
+    assert!(output.status.success(), "{}", output.status);
+    let stdout = String::from_utf8(output.stdout).unwrap();
+    let target_data_layout =
+        stdout.split_once(r#""data-layout": ""#).unwrap().1.split_once('"').unwrap().0.to_owned();
+
+    let ra_fixture = format!(
+        "{minicore}//- /main.rs crate:test target_data_layout:{target_data_layout}\n{ra_fixture}",
+    );
+
+    let (db, file_id) = TestDB::with_single_file(&ra_fixture);
+    let module_id = db.module_for_file(file_id);
+    let def_map = module_id.def_map(&db);
+    let scope = &def_map[module_id.local_id].scope;
+    let adt_id = scope
+        .declarations()
+        .find_map(|x| match x {
+            hir_def::ModuleDefId::AdtId(x) => {
+                let name = match x {
+                    hir_def::AdtId::StructId(x) => db.struct_data(x).name.to_smol_str(),
+                    hir_def::AdtId::UnionId(x) => db.union_data(x).name.to_smol_str(),
+                    hir_def::AdtId::EnumId(x) => db.enum_data(x).name.to_smol_str(),
+                };
+                (name == "Goal").then_some(x)
+            }
+            _ => None,
+        })
+        .unwrap();
+    let goal_ty = TyKind::Adt(AdtId(adt_id), Substitution::empty(Interner)).intern(Interner);
+    layout_of_ty(&db, &goal_ty, module_id.krate())
+}
+
+#[track_caller]
+fn check_size_and_align(ra_fixture: &str, minicore: &str, size: u64, align: u64) {
+    let l = eval_goal(ra_fixture, minicore).unwrap();
+    assert_eq!(l.size.bytes(), size);
+    assert_eq!(l.align.abi.bytes(), align);
+}
+
+#[track_caller]
+fn check_fail(ra_fixture: &str, e: LayoutError) {
+    let r = eval_goal(ra_fixture, "");
+    assert_eq!(r, Err(e));
+}
+
+macro_rules! size_and_align {
+    (minicore: $($x:tt),*;$($t:tt)*) => {
+        {
+            #[allow(dead_code)]
+            $($t)*
+            check_size_and_align(
+                stringify!($($t)*),
+                &format!("//- minicore: {}\n", stringify!($($x),*)),
+                ::std::mem::size_of::<Goal>() as u64,
+                ::std::mem::align_of::<Goal>() as u64,
+            );
+        }
+    };
+    ($($t:tt)*) => {
+        {
+            #[allow(dead_code)]
+            $($t)*
+            check_size_and_align(
+                stringify!($($t)*),
+                "",
+                ::std::mem::size_of::<Goal>() as u64,
+                ::std::mem::align_of::<Goal>() as u64,
+            );
+        }
+    };
+}
+
+#[test]
+fn hello_world() {
+    size_and_align! {
+        struct Goal(i32);
+    }
+}
+
+#[test]
+fn field_order_optimization() {
+    size_and_align! {
+        struct Goal(u8, i32, u8);
+    }
+    size_and_align! {
+        #[repr(C)]
+        struct Goal(u8, i32, u8);
+    }
+}
+
+#[test]
+fn recursive() {
+    size_and_align! {
+        struct Goal {
+            left: &'static Goal,
+            right: &'static Goal,
+        }
+    }
+    size_and_align! {
+        struct BoxLike<T: ?Sized>(*mut T);
+        struct Goal(BoxLike<Goal>);
+    }
+    check_fail(
+        r#"struct Goal(Goal);"#,
+        LayoutError::UserError("infinite sized recursive type".to_string()),
+    );
+    check_fail(
+        r#"
+        struct Foo<T>(Foo<T>);
+        struct Goal(Foo<i32>);
+        "#,
+        LayoutError::UserError("infinite sized recursive type".to_string()),
+    );
+}
+
+#[test]
+fn generic() {
+    size_and_align! {
+        struct Pair<A, B>(A, B);
+        struct Goal(Pair<Pair<i32, u8>, i64>);
+    }
+    size_and_align! {
+        struct X<const N: usize> {
+            field1: [i32; N],
+            field2: [u8; N],
+        }
+        struct Goal(X<1000>);
+    }
+}
+
+#[test]
+fn enums() {
+    size_and_align! {
+        enum Goal {
+            Quit,
+            Move { x: i32, y: i32 },
+            ChangeColor(i32, i32, i32),
+        }
+    }
+}
+
+#[test]
+fn primitives() {
+    size_and_align! {
+        struct Goal(i32, i128, isize, usize, f32, f64, bool, char);
+    }
+}
+
+#[test]
+fn tuple() {
+    size_and_align! {
+        struct Goal((), (i32, u64, bool));
+    }
+}
+
+#[test]
+fn non_zero() {
+    size_and_align! {
+        minicore: non_zero, option;
+        use core::num::NonZeroU8;
+        struct Goal(Option<NonZeroU8>);
+    }
+}
+
+#[test]
+fn niche_optimization() {
+    size_and_align! {
+        minicore: option;
+        struct Goal(Option<&'static i32>);
+    }
+    size_and_align! {
+        minicore: option;
+        struct Goal(Option<Option<bool>>);
+    }
+}
+
+#[test]
+fn enums_with_discriminants() {
+    size_and_align! {
+        enum Goal {
+            A = 1000,
+            B = 2000,
+            C = 3000,
+        }
+    }
+    size_and_align! {
+        enum Goal {
+            A = 254,
+            B,
+            C, // implicitly becomes 256, so we need two bytes
+        }
+    }
+}
diff --git a/crates/hir-ty/src/lib.rs b/crates/hir-ty/src/lib.rs
index 39514fc44e..cbe6873c7d 100644
--- a/crates/hir-ty/src/lib.rs
+++ b/crates/hir-ty/src/lib.rs
@@ -27,6 +27,8 @@ pub mod display;
 pub mod method_resolution;
 pub mod primitive;
 pub mod traits;
+pub mod layout;
+pub mod lang_items;
 
 #[cfg(test)]
 mod tests;
@@ -38,7 +40,7 @@ use std::sync::Arc;
 use chalk_ir::{
     fold::{Shift, TypeFoldable},
     interner::HasInterner,
-    NoSolution, UniverseIndex,
+    NoSolution,
 };
 use hir_def::{expr::ExprId, type_ref::Rawness, TypeOrConstParamId};
 use hir_expand::name;
@@ -46,7 +48,9 @@ use itertools::Either;
 use traits::FnTrait;
 use utils::Generics;
 
-use crate::{consteval::unknown_const, db::HirDatabase, utils::generics};
+use crate::{
+    consteval::unknown_const, db::HirDatabase, infer::unify::InferenceTable, utils::generics,
+};
 
 pub use autoderef::autoderef;
 pub use builder::{ParamKind, TyBuilder};
@@ -511,7 +515,7 @@ where
     let mut error_replacer = ErrorReplacer { vars: 0 };
     let value = match t.clone().try_fold_with(&mut error_replacer, DebruijnIndex::INNERMOST) {
         Ok(t) => t,
-        Err(_) => panic!("Encountered unbound or inference vars in {:?}", t),
+        Err(_) => panic!("Encountered unbound or inference vars in {t:?}"),
     };
     let kinds = (0..error_replacer.vars).map(|_| {
         chalk_ir::CanonicalVarKind::new(
@@ -531,54 +535,31 @@ pub fn callable_sig_from_fnonce(
     let fn_once_trait = FnTrait::FnOnce.get_id(db, krate)?;
     let output_assoc_type = db.trait_data(fn_once_trait).associated_type_by_name(&name![Output])?;
 
+    let mut table = InferenceTable::new(db, env.clone());
     let b = TyBuilder::trait_ref(db, fn_once_trait);
     if b.remaining() != 2 {
         return None;
     }
-    let fn_once = b.push(self_ty.clone()).fill_with_bound_vars(DebruijnIndex::INNERMOST, 0).build();
-    let kinds = fn_once
-        .substitution
-        .iter(Interner)
-        .skip(1)
-        .map(|x| {
-            let vk = match x.data(Interner) {
-                chalk_ir::GenericArgData::Ty(_) => {
-                    chalk_ir::VariableKind::Ty(chalk_ir::TyVariableKind::General)
-                }
-                chalk_ir::GenericArgData::Lifetime(_) => chalk_ir::VariableKind::Lifetime,
-                chalk_ir::GenericArgData::Const(c) => {
-                    chalk_ir::VariableKind::Const(c.data(Interner).ty.clone())
-                }
-            };
-            chalk_ir::WithKind::new(vk, UniverseIndex::ROOT)
-        })
-        .collect::<Vec<_>>();
 
-    // FIXME: chalk refuses to solve `<Self as FnOnce<^0.0>>::Output == ^0.1`, so we first solve
-    // `<Self as FnOnce<^0.0>>` and then replace `^0.0` with the concrete argument tuple.
-    let trait_env = env.env.clone();
-    let obligation = InEnvironment { goal: fn_once.cast(Interner), environment: trait_env };
-    let canonical =
-        Canonical { binders: CanonicalVarKinds::from_iter(Interner, kinds), value: obligation };
-    let subst = match db.trait_solve(krate, canonical) {
-        Some(Solution::Unique(vars)) => vars.value.subst,
-        _ => return None,
-    };
-    let args = subst.at(Interner, 0).ty(Interner)?;
-    let params = match args.kind(Interner) {
-        chalk_ir::TyKind::Tuple(_, subst) => {
-            subst.iter(Interner).filter_map(|arg| arg.ty(Interner).cloned()).collect::<Vec<_>>()
-        }
-        _ => return None,
-    };
+    // Register two obligations:
+    // - Self: FnOnce<?args_ty>
+    // - <Self as FnOnce<?args_ty>>::Output == ?ret_ty
+    let args_ty = table.new_type_var();
+    let trait_ref = b.push(self_ty.clone()).push(args_ty.clone()).build();
+    let projection = TyBuilder::assoc_type_projection(
+        db,
+        output_assoc_type,
+        Some(trait_ref.substitution.clone()),
+    )
+    .build();
+    table.register_obligation(trait_ref.cast(Interner));
+    let ret_ty = table.normalize_projection_ty(projection);
 
-    let fn_once =
-        TyBuilder::trait_ref(db, fn_once_trait).push(self_ty.clone()).push(args.clone()).build();
-    let projection =
-        TyBuilder::assoc_type_projection(db, output_assoc_type, Some(fn_once.substitution.clone()))
-            .build();
+    let ret_ty = table.resolve_completely(ret_ty);
+    let args_ty = table.resolve_completely(args_ty);
 
-    let ret_ty = db.normalize_projection(projection, env);
+    let params =
+        args_ty.as_tuple()?.iter(Interner).map(|it| it.assert_ty_ref(Interner)).cloned().collect();
 
-    Some(CallableSig::from_params_and_return(params, ret_ty.clone(), false, Safety::Safe))
+    Some(CallableSig::from_params_and_return(params, ret_ty, false, Safety::Safe))
 }
diff --git a/crates/hir-ty/src/lower.rs b/crates/hir-ty/src/lower.rs
index baf9842d5f..592410008a 100644
--- a/crates/hir-ty/src/lower.rs
+++ b/crates/hir-ty/src/lower.rs
@@ -603,9 +603,8 @@ impl<'a> TyLoweringContext<'a> {
     }
 
     fn select_associated_type(&self, res: Option<TypeNs>, segment: PathSegment<'_>) -> Ty {
-        let (def, res) = match (self.resolver.generic_def(), res) {
-            (Some(def), Some(res)) => (def, res),
-            _ => return TyKind::Error.intern(Interner),
+        let Some((def, res)) = self.resolver.generic_def().zip(res) else {
+            return TyKind::Error.intern(Interner);
         };
         let ty = named_associated_type_shorthand_candidates(
             self.db,
@@ -617,6 +616,21 @@ impl<'a> TyLoweringContext<'a> {
                     return None;
                 }
 
+                let parent_subst = t.substitution.clone();
+                let parent_subst = match self.type_param_mode {
+                    ParamLoweringMode::Placeholder => {
+                        // if we're lowering to placeholders, we have to put them in now.
+                        let generics = generics(self.db.upcast(), def);
+                        let s = generics.placeholder_subst(self.db);
+                        s.apply(parent_subst, Interner)
+                    }
+                    ParamLoweringMode::Variable => {
+                        // We need to shift in the bound vars, since
+                        // `named_associated_type_shorthand_candidates` does not do that.
+                        parent_subst.shifted_in_from(Interner, self.in_binders)
+                    }
+                };
+
                 // FIXME: `substs_from_path_segment()` pushes `TyKind::Error` for every parent
                 // generic params. It's inefficient to splice the `Substitution`s, so we may want
                 // that method to optionally take parent `Substitution` as we already know them at
@@ -632,22 +646,9 @@ impl<'a> TyLoweringContext<'a> {
 
                 let substs = Substitution::from_iter(
                     Interner,
-                    substs.iter(Interner).take(len_self).chain(t.substitution.iter(Interner)),
+                    substs.iter(Interner).take(len_self).chain(parent_subst.iter(Interner)),
                 );
 
-                let substs = match self.type_param_mode {
-                    ParamLoweringMode::Placeholder => {
-                        // if we're lowering to placeholders, we have to put
-                        // them in now
-                        let generics = generics(self.db.upcast(), def);
-                        let s = generics.placeholder_subst(self.db);
-                        s.apply(substs, Interner)
-                    }
-                    ParamLoweringMode::Variable => substs,
-                };
-                // We need to shift in the bound vars, since
-                // associated_type_shorthand_candidates does not do that
-                let substs = substs.shifted_in_from(Interner, self.in_binders);
                 Some(
                     TyKind::Alias(AliasTy::Projection(ProjectionTy {
                         associated_ty_id: to_assoc_type_id(associated_ty),
@@ -779,7 +780,7 @@ impl<'a> TyLoweringContext<'a> {
                         |_, c, ty| {
                             const_or_path_to_chalk(
                                 self.db,
-                                &self.resolver,
+                                self.resolver,
                                 ty,
                                 c,
                                 self.type_param_mode,
@@ -1190,9 +1191,9 @@ pub fn associated_type_shorthand_candidates<R>(
     db: &dyn HirDatabase,
     def: GenericDefId,
     res: TypeNs,
-    cb: impl FnMut(&Name, &TraitRef, TypeAliasId) -> Option<R>,
+    mut cb: impl FnMut(&Name, TypeAliasId) -> Option<R>,
 ) -> Option<R> {
-    named_associated_type_shorthand_candidates(db, def, res, None, cb)
+    named_associated_type_shorthand_candidates(db, def, res, None, |name, _, id| cb(name, id))
 }
 
 fn named_associated_type_shorthand_candidates<R>(
@@ -1202,6 +1203,9 @@ fn named_associated_type_shorthand_candidates<R>(
     def: GenericDefId,
     res: TypeNs,
     assoc_name: Option<Name>,
+    // Do NOT let `cb` touch `TraitRef` outside of `TyLoweringContext`. Its substitution contains
+    // free `BoundVar`s that need to be shifted and only `TyLoweringContext` knows how to do that
+    // properly (see `TyLoweringContext::select_associated_type()`).
     mut cb: impl FnMut(&Name, &TraitRef, TypeAliasId) -> Option<R>,
 ) -> Option<R> {
     let mut search = |t| {
@@ -1792,8 +1796,7 @@ pub(crate) fn impl_self_ty_query(db: &dyn HirDatabase, impl_id: ImplId) -> Binde
     let impl_data = db.impl_data(impl_id);
     let resolver = impl_id.resolver(db.upcast());
     let _cx = stdx::panic_context::enter(format!(
-        "impl_self_ty_query({:?} -> {:?} -> {:?})",
-        impl_id, impl_loc, impl_data
+        "impl_self_ty_query({impl_id:?} -> {impl_loc:?} -> {impl_data:?})"
     ));
     let generics = generics(db.upcast(), impl_id.into());
     let ctx =
@@ -1830,8 +1833,7 @@ pub(crate) fn impl_trait_query(db: &dyn HirDatabase, impl_id: ImplId) -> Option<
     let impl_data = db.impl_data(impl_id);
     let resolver = impl_id.resolver(db.upcast());
     let _cx = stdx::panic_context::enter(format!(
-        "impl_trait_query({:?} -> {:?} -> {:?})",
-        impl_id, impl_loc, impl_data
+        "impl_trait_query({impl_id:?} -> {impl_loc:?} -> {impl_data:?})"
     ));
     let ctx =
         TyLoweringContext::new(db, &resolver).with_type_param_mode(ParamLoweringMode::Variable);
@@ -1850,7 +1852,7 @@ pub(crate) fn return_type_impl_traits(
     let ctx_ret = TyLoweringContext::new(db, &resolver)
         .with_impl_trait_mode(ImplTraitLoweringMode::Opaque)
         .with_type_param_mode(ParamLoweringMode::Variable);
-    let _ret = (&ctx_ret).lower_ty(&data.ret_type);
+    let _ret = ctx_ret.lower_ty(&data.ret_type);
     let generics = generics(db.upcast(), def.into());
     let return_type_impl_traits =
         ReturnTypeImplTraits { impl_traits: ctx_ret.opaque_type_data.into_inner() };
@@ -1979,7 +1981,7 @@ fn fallback_bound_vars<T: TypeFoldable<Interner> + HasInterner<Interner = Intern
             if bound.index_if_innermost().map_or(true, is_allowed) {
                 bound.shifted_in_from(binders).to_const(Interner, ty)
             } else {
-                unknown_const(ty.clone())
+                unknown_const(ty)
             }
         },
     )
diff --git a/crates/hir-ty/src/method_resolution.rs b/crates/hir-ty/src/method_resolution.rs
index 8bcfa2728f..2328dceb83 100644
--- a/crates/hir-ty/src/method_resolution.rs
+++ b/crates/hir-ty/src/method_resolution.rs
@@ -2,18 +2,17 @@
 //! For details about how this works in rustc, see the method lookup page in the
 //! [rustc guide](https://rust-lang.github.io/rustc-guide/method-lookup.html)
 //! and the corresponding code mostly in rustc_hir_analysis/check/method/probe.rs.
-use std::{iter, ops::ControlFlow, sync::Arc};
+use std::{ops::ControlFlow, sync::Arc};
 
-use arrayvec::ArrayVec;
 use base_db::{CrateId, Edition};
 use chalk_ir::{cast::Cast, Mutability, UniverseIndex};
 use hir_def::{
     data::ImplData, item_scope::ItemScope, nameres::DefMap, AssocItemId, BlockId, ConstId,
-    FunctionId, GenericDefId, HasModule, ImplId, ItemContainerId, Lookup, ModuleDefId, ModuleId,
-    TraitId,
+    FunctionId, HasModule, ImplId, ItemContainerId, Lookup, ModuleDefId, ModuleId, TraitId,
 };
 use hir_expand::name::Name;
 use rustc_hash::{FxHashMap, FxHashSet};
+use smallvec::{smallvec, SmallVec};
 use stdx::never;
 
 use crate::{
@@ -336,21 +335,18 @@ impl InherentImpls {
     }
 }
 
-pub(crate) fn inherent_impl_crates_query(
+pub(crate) fn incoherent_inherent_impl_crates(
     db: &dyn HirDatabase,
     krate: CrateId,
     fp: TyFingerprint,
-) -> ArrayVec<CrateId, 2> {
+) -> SmallVec<[CrateId; 2]> {
     let _p = profile::span("inherent_impl_crates_query");
-    let mut res = ArrayVec::new();
+    let mut res = SmallVec::new();
     let crate_graph = db.crate_graph();
 
+    // should pass crate for finger print and do reverse deps
+
     for krate in crate_graph.transitive_deps(krate) {
-        if res.is_full() {
-            // we don't currently look for or store more than two crates here,
-            // so don't needlessly look at more crates than necessary.
-            break;
-        }
         let impls = db.inherent_impls_in_crate(krate);
         if impls.map.get(&fp).map_or(false, |v| !v.is_empty()) {
             res.push(krate);
@@ -392,19 +388,40 @@ pub fn def_crates(
     db: &dyn HirDatabase,
     ty: &Ty,
     cur_crate: CrateId,
-) -> Option<ArrayVec<CrateId, 2>> {
-    let mod_to_crate_ids = |module: ModuleId| Some(iter::once(module.krate()).collect());
-
-    let fp = TyFingerprint::for_inherent_impl(ty);
-
+) -> Option<SmallVec<[CrateId; 2]>> {
     match ty.kind(Interner) {
-        TyKind::Adt(AdtId(def_id), _) => mod_to_crate_ids(def_id.module(db.upcast())),
-        TyKind::Foreign(id) => {
-            mod_to_crate_ids(from_foreign_def_id(*id).lookup(db.upcast()).module(db.upcast()))
+        &TyKind::Adt(AdtId(def_id), _) => {
+            let rustc_has_incoherent_inherent_impls = match def_id {
+                hir_def::AdtId::StructId(id) => {
+                    db.struct_data(id).rustc_has_incoherent_inherent_impls
+                }
+                hir_def::AdtId::UnionId(id) => {
+                    db.union_data(id).rustc_has_incoherent_inherent_impls
+                }
+                hir_def::AdtId::EnumId(id) => db.enum_data(id).rustc_has_incoherent_inherent_impls,
+            };
+            Some(if rustc_has_incoherent_inherent_impls {
+                db.incoherent_inherent_impl_crates(cur_crate, TyFingerprint::Adt(def_id))
+            } else {
+                smallvec![def_id.module(db.upcast()).krate()]
+            })
+        }
+        &TyKind::Foreign(id) => {
+            let alias = from_foreign_def_id(id);
+            Some(if db.type_alias_data(alias).rustc_has_incoherent_inherent_impls {
+                db.incoherent_inherent_impl_crates(cur_crate, TyFingerprint::ForeignType(id))
+            } else {
+                smallvec![alias.module(db.upcast()).krate()]
+            })
+        }
+        TyKind::Dyn(_) => {
+            let trait_id = ty.dyn_trait()?;
+            Some(if db.trait_data(trait_id).rustc_has_incoherent_inherent_impls {
+                db.incoherent_inherent_impl_crates(cur_crate, TyFingerprint::Dyn(trait_id))
+            } else {
+                smallvec![trait_id.module(db.upcast()).krate()]
+            })
         }
-        TyKind::Dyn(_) => ty
-            .dyn_trait()
-            .and_then(|trait_| mod_to_crate_ids(GenericDefId::TraitId(trait_).module(db.upcast()))),
         // for primitives, there may be impls in various places (core and alloc
         // mostly). We just check the whole crate graph for crates with impls
         // (cached behind a query).
@@ -412,10 +429,11 @@ pub fn def_crates(
         | TyKind::Str
         | TyKind::Slice(_)
         | TyKind::Array(..)
-        | TyKind::Raw(..) => {
-            Some(db.inherent_impl_crates(cur_crate, fp.expect("fingerprint for primitive")))
-        }
-        _ => return None,
+        | TyKind::Raw(..) => Some(db.incoherent_inherent_impl_crates(
+            cur_crate,
+            TyFingerprint::for_inherent_impl(ty).expect("fingerprint for primitive"),
+        )),
+        _ => None,
     }
 }
 
@@ -470,14 +488,15 @@ pub fn lang_names_for_bin_op(op: syntax::ast::BinaryOp) -> Option<(Name, Name)>
 
 /// Look up the method with the given name.
 pub(crate) fn lookup_method(
-    ty: &Canonical<Ty>,
     db: &dyn HirDatabase,
+    ty: &Canonical<Ty>,
     env: Arc<TraitEnvironment>,
     traits_in_scope: &FxHashSet<TraitId>,
     visible_from_module: VisibleFromModule,
     name: &Name,
-) -> Option<(ReceiverAdjustments, FunctionId)> {
-    iterate_method_candidates(
+) -> Option<(ReceiverAdjustments, FunctionId, bool)> {
+    let mut not_visible = None;
+    let res = iterate_method_candidates(
         ty,
         db,
         env,
@@ -485,11 +504,16 @@ pub(crate) fn lookup_method(
         visible_from_module,
         Some(name),
         LookupMode::MethodCall,
-        |adjustments, f| match f {
-            AssocItemId::FunctionId(f) => Some((adjustments, f)),
+        |adjustments, f, visible| match f {
+            AssocItemId::FunctionId(f) if visible => Some((adjustments, f, true)),
+            AssocItemId::FunctionId(f) if not_visible.is_none() => {
+                not_visible = Some((adjustments, f, false));
+                None
+            }
             _ => None,
         },
-    )
+    );
+    res.or(not_visible)
 }
 
 /// Whether we're looking up a dotted method call (like `v.len()`) or a path
@@ -601,7 +625,7 @@ pub(crate) fn iterate_method_candidates<T>(
     visible_from_module: VisibleFromModule,
     name: Option<&Name>,
     mode: LookupMode,
-    mut callback: impl FnMut(ReceiverAdjustments, AssocItemId) -> Option<T>,
+    mut callback: impl FnMut(ReceiverAdjustments, AssocItemId, bool) -> Option<T>,
 ) -> Option<T> {
     let mut slot = None;
     iterate_method_candidates_dyn(
@@ -612,9 +636,9 @@ pub(crate) fn iterate_method_candidates<T>(
         visible_from_module,
         name,
         mode,
-        &mut |adj, item| {
+        &mut |adj, item, visible| {
             assert!(slot.is_none());
-            if let Some(it) = callback(adj, item) {
+            if let Some(it) = callback(adj, item, visible) {
                 slot = Some(it);
                 return ControlFlow::Break(());
             }
@@ -624,6 +648,30 @@ pub(crate) fn iterate_method_candidates<T>(
     slot
 }
 
+pub fn lookup_impl_const(
+    db: &dyn HirDatabase,
+    env: Arc<TraitEnvironment>,
+    const_id: ConstId,
+    subs: Substitution,
+) -> ConstId {
+    let trait_id = match const_id.lookup(db.upcast()).container {
+        ItemContainerId::TraitId(id) => id,
+        _ => return const_id,
+    };
+    let substitution = Substitution::from_iter(Interner, subs.iter(Interner));
+    let trait_ref = TraitRef { trait_id: to_chalk_trait_id(trait_id), substitution };
+
+    let const_data = db.const_data(const_id);
+    let name = match const_data.name.as_ref() {
+        Some(name) => name,
+        None => return const_id,
+    };
+
+    lookup_impl_assoc_item_for_trait_ref(trait_ref, db, env, name)
+        .and_then(|assoc| if let AssocItemId::ConstId(id) = assoc { Some(id) } else { None })
+        .unwrap_or(const_id)
+}
+
 /// Looks up the impl method that actually runs for the trait method `func`.
 ///
 /// Returns `func` if it's not a method defined in a trait or the lookup failed.
@@ -645,15 +693,17 @@ pub fn lookup_impl_method(
     };
 
     let name = &db.function_data(func).name;
-    lookup_impl_method_for_trait_ref(trait_ref, db, env, name).unwrap_or(func)
+    lookup_impl_assoc_item_for_trait_ref(trait_ref, db, env, name)
+        .and_then(|assoc| if let AssocItemId::FunctionId(id) = assoc { Some(id) } else { None })
+        .unwrap_or(func)
 }
 
-fn lookup_impl_method_for_trait_ref(
+fn lookup_impl_assoc_item_for_trait_ref(
     trait_ref: TraitRef,
     db: &dyn HirDatabase,
     env: Arc<TraitEnvironment>,
     name: &Name,
-) -> Option<FunctionId> {
+) -> Option<AssocItemId> {
     let self_ty = trait_ref.self_type_parameter(Interner);
     let self_ty_fp = TyFingerprint::for_trait_impl(&self_ty)?;
     let impls = db.trait_impls_in_deps(env.krate);
@@ -663,7 +713,15 @@ fn lookup_impl_method_for_trait_ref(
 
     let impl_data = find_matching_impl(impls, table, trait_ref)?;
     impl_data.items.iter().find_map(|it| match it {
-        AssocItemId::FunctionId(f) => (db.function_data(*f).name == *name).then(|| *f),
+        AssocItemId::FunctionId(f) => {
+            (db.function_data(*f).name == *name).then_some(AssocItemId::FunctionId(*f))
+        }
+        AssocItemId::ConstId(c) => db
+            .const_data(*c)
+            .name
+            .as_ref()
+            .map(|n| *n == *name)
+            .and_then(|result| if result { Some(AssocItemId::ConstId(*c)) } else { None }),
         _ => None,
     })
 }
@@ -719,7 +777,7 @@ pub fn iterate_path_candidates(
         name,
         LookupMode::Path,
         // the adjustments are not relevant for path lookup
-        &mut |_, id| callback(id),
+        &mut |_, id, _| callback(id),
     )
 }
 
@@ -731,7 +789,7 @@ pub fn iterate_method_candidates_dyn(
     visible_from_module: VisibleFromModule,
     name: Option<&Name>,
     mode: LookupMode,
-    callback: &mut dyn FnMut(ReceiverAdjustments, AssocItemId) -> ControlFlow<()>,
+    callback: &mut dyn FnMut(ReceiverAdjustments, AssocItemId, bool) -> ControlFlow<()>,
 ) -> ControlFlow<()> {
     match mode {
         LookupMode::MethodCall => {
@@ -795,7 +853,7 @@ fn iterate_method_candidates_with_autoref(
     traits_in_scope: &FxHashSet<TraitId>,
     visible_from_module: VisibleFromModule,
     name: Option<&Name>,
-    mut callback: &mut dyn FnMut(ReceiverAdjustments, AssocItemId) -> ControlFlow<()>,
+    mut callback: &mut dyn FnMut(ReceiverAdjustments, AssocItemId, bool) -> ControlFlow<()>,
 ) -> ControlFlow<()> {
     if receiver_ty.value.is_general_var(Interner, &receiver_ty.binders) {
         // don't try to resolve methods on unknown types
@@ -856,7 +914,7 @@ fn iterate_method_candidates_by_receiver(
     traits_in_scope: &FxHashSet<TraitId>,
     visible_from_module: VisibleFromModule,
     name: Option<&Name>,
-    mut callback: &mut dyn FnMut(ReceiverAdjustments, AssocItemId) -> ControlFlow<()>,
+    mut callback: &mut dyn FnMut(ReceiverAdjustments, AssocItemId, bool) -> ControlFlow<()>,
 ) -> ControlFlow<()> {
     let mut table = InferenceTable::new(db, env);
     let receiver_ty = table.instantiate_canonical(receiver_ty.clone());
@@ -868,7 +926,7 @@ fn iterate_method_candidates_by_receiver(
     while let Some((self_ty, _)) = autoderef.next() {
         iterate_inherent_methods(
             &self_ty,
-            &mut autoderef.table,
+            autoderef.table,
             name,
             Some(&receiver_ty),
             Some(receiver_adjustments.clone()),
@@ -883,7 +941,7 @@ fn iterate_method_candidates_by_receiver(
     while let Some((self_ty, _)) = autoderef.next() {
         iterate_trait_method_candidates(
             &self_ty,
-            &mut autoderef.table,
+            autoderef.table,
             traits_in_scope,
             name,
             Some(&receiver_ty),
@@ -902,7 +960,7 @@ fn iterate_method_candidates_for_self_ty(
     traits_in_scope: &FxHashSet<TraitId>,
     visible_from_module: VisibleFromModule,
     name: Option<&Name>,
-    mut callback: &mut dyn FnMut(ReceiverAdjustments, AssocItemId) -> ControlFlow<()>,
+    mut callback: &mut dyn FnMut(ReceiverAdjustments, AssocItemId, bool) -> ControlFlow<()>,
 ) -> ControlFlow<()> {
     let mut table = InferenceTable::new(db, env);
     let self_ty = table.instantiate_canonical(self_ty.clone());
@@ -933,7 +991,7 @@ fn iterate_trait_method_candidates(
     name: Option<&Name>,
     receiver_ty: Option<&Ty>,
     receiver_adjustments: Option<ReceiverAdjustments>,
-    callback: &mut dyn FnMut(ReceiverAdjustments, AssocItemId) -> ControlFlow<()>,
+    callback: &mut dyn FnMut(ReceiverAdjustments, AssocItemId, bool) -> ControlFlow<()>,
 ) -> ControlFlow<()> {
     let db = table.db;
     let env = table.trait_env.clone();
@@ -964,9 +1022,11 @@ fn iterate_trait_method_candidates(
         for &(_, item) in data.items.iter() {
             // Don't pass a `visible_from_module` down to `is_valid_candidate`,
             // since only inherent methods should be included into visibility checking.
-            if !is_valid_candidate(table, name, receiver_ty, item, self_ty, None) {
-                continue;
-            }
+            let visible = match is_valid_candidate(table, name, receiver_ty, item, self_ty, None) {
+                IsValidCandidate::Yes => true,
+                IsValidCandidate::NotVisible => false,
+                IsValidCandidate::No => continue,
+            };
             if !known_implemented {
                 let goal = generic_implements_goal(db, env.clone(), t, &canonical_self_ty);
                 if db.trait_solve(env.krate, goal.cast(Interner)).is_none() {
@@ -974,7 +1034,7 @@ fn iterate_trait_method_candidates(
                 }
             }
             known_implemented = true;
-            callback(receiver_adjustments.clone().unwrap_or_default(), item)?;
+            callback(receiver_adjustments.clone().unwrap_or_default(), item, visible)?;
         }
     }
     ControlFlow::Continue(())
@@ -987,7 +1047,7 @@ fn iterate_inherent_methods(
     receiver_ty: Option<&Ty>,
     receiver_adjustments: Option<ReceiverAdjustments>,
     visible_from_module: VisibleFromModule,
-    callback: &mut dyn FnMut(ReceiverAdjustments, AssocItemId) -> ControlFlow<()>,
+    callback: &mut dyn FnMut(ReceiverAdjustments, AssocItemId, bool) -> ControlFlow<()>,
 ) -> ControlFlow<()> {
     let db = table.db;
     let env = table.trait_env.clone();
@@ -1076,7 +1136,7 @@ fn iterate_inherent_methods(
         name: Option<&Name>,
         receiver_ty: Option<&Ty>,
         receiver_adjustments: Option<ReceiverAdjustments>,
-        callback: &mut dyn FnMut(ReceiverAdjustments, AssocItemId) -> ControlFlow<()>,
+        callback: &mut dyn FnMut(ReceiverAdjustments, AssocItemId, bool) -> ControlFlow<()>,
         traits: impl Iterator<Item = TraitId>,
     ) -> ControlFlow<()> {
         let db = table.db;
@@ -1084,9 +1144,13 @@ fn iterate_inherent_methods(
             let data = db.trait_data(t);
             for &(_, item) in data.items.iter() {
                 // We don't pass `visible_from_module` as all trait items should be visible.
-                if is_valid_candidate(table, name, receiver_ty, item, self_ty, None) {
-                    callback(receiver_adjustments.clone().unwrap_or_default(), item)?;
-                }
+                let visible =
+                    match is_valid_candidate(table, name, receiver_ty, item, self_ty, None) {
+                        IsValidCandidate::Yes => true,
+                        IsValidCandidate::NotVisible => false,
+                        IsValidCandidate::No => continue,
+                    };
+                callback(receiver_adjustments.clone().unwrap_or_default(), item, visible)?;
             }
         }
         ControlFlow::Continue(())
@@ -1100,17 +1164,25 @@ fn iterate_inherent_methods(
         receiver_ty: Option<&Ty>,
         receiver_adjustments: Option<ReceiverAdjustments>,
         visible_from_module: Option<ModuleId>,
-        callback: &mut dyn FnMut(ReceiverAdjustments, AssocItemId) -> ControlFlow<()>,
+        callback: &mut dyn FnMut(ReceiverAdjustments, AssocItemId, bool) -> ControlFlow<()>,
     ) -> ControlFlow<()> {
         let db = table.db;
         let impls_for_self_ty = impls.for_self_ty(self_ty);
         for &impl_def in impls_for_self_ty {
             for &item in &db.impl_data(impl_def).items {
-                if !is_valid_candidate(table, name, receiver_ty, item, self_ty, visible_from_module)
-                {
-                    continue;
-                }
-                callback(receiver_adjustments.clone().unwrap_or_default(), item)?;
+                let visible = match is_valid_candidate(
+                    table,
+                    name,
+                    receiver_ty,
+                    item,
+                    self_ty,
+                    visible_from_module,
+                ) {
+                    IsValidCandidate::Yes => true,
+                    IsValidCandidate::NotVisible => false,
+                    IsValidCandidate::No => continue,
+                };
+                callback(receiver_adjustments.clone().unwrap_or_default(), item, visible)?;
             }
         }
         ControlFlow::Continue(())
@@ -1139,7 +1211,7 @@ pub fn resolve_indexing_op(
 macro_rules! check_that {
     ($cond:expr) => {
         if !$cond {
-            return false;
+            return IsValidCandidate::No;
         }
     };
 }
@@ -1151,7 +1223,7 @@ fn is_valid_candidate(
     item: AssocItemId,
     self_ty: &Ty,
     visible_from_module: Option<ModuleId>,
-) -> bool {
+) -> IsValidCandidate {
     let db = table.db;
     match item {
         AssocItemId::FunctionId(m) => {
@@ -1162,31 +1234,37 @@ fn is_valid_candidate(
             check_that!(receiver_ty.is_none());
 
             check_that!(name.map_or(true, |n| data.name.as_ref() == Some(n)));
-            check_that!(visible_from_module.map_or(true, |from_module| {
-                let v = db.const_visibility(c).is_visible_from(db.upcast(), from_module);
-                if !v {
+
+            if let Some(from_module) = visible_from_module {
+                if !db.const_visibility(c).is_visible_from(db.upcast(), from_module) {
                     cov_mark::hit!(const_candidate_not_visible);
+                    return IsValidCandidate::NotVisible;
                 }
-                v
-            }));
+            }
             if let ItemContainerId::ImplId(impl_id) = c.lookup(db.upcast()).container {
                 let self_ty_matches = table.run_in_snapshot(|table| {
                     let expected_self_ty = TyBuilder::impl_self_ty(db, impl_id)
                         .fill_with_inference_vars(table)
                         .build();
-                    table.unify(&expected_self_ty, &self_ty)
+                    table.unify(&expected_self_ty, self_ty)
                 });
                 if !self_ty_matches {
                     cov_mark::hit!(const_candidate_self_type_mismatch);
-                    return false;
+                    return IsValidCandidate::No;
                 }
             }
-            true
+            IsValidCandidate::Yes
         }
-        _ => false,
+        _ => IsValidCandidate::No,
     }
 }
 
+enum IsValidCandidate {
+    Yes,
+    No,
+    NotVisible,
+}
+
 fn is_valid_fn_candidate(
     table: &mut InferenceTable<'_>,
     fn_id: FunctionId,
@@ -1194,19 +1272,17 @@ fn is_valid_fn_candidate(
     receiver_ty: Option<&Ty>,
     self_ty: &Ty,
     visible_from_module: Option<ModuleId>,
-) -> bool {
+) -> IsValidCandidate {
     let db = table.db;
     let data = db.function_data(fn_id);
 
     check_that!(name.map_or(true, |n| n == &data.name));
-    check_that!(visible_from_module.map_or(true, |from_module| {
-        let v = db.function_visibility(fn_id).is_visible_from(db.upcast(), from_module);
-        if !v {
+    if let Some(from_module) = visible_from_module {
+        if !db.function_visibility(fn_id).is_visible_from(db.upcast(), from_module) {
             cov_mark::hit!(autoderef_candidate_not_visible);
+            return IsValidCandidate::NotVisible;
         }
-        v
-    }));
-
+    }
     table.run_in_snapshot(|table| {
         let container = fn_id.lookup(db.upcast()).container;
         let (impl_subst, expect_self_ty) = match container {
@@ -1245,7 +1321,7 @@ fn is_valid_fn_candidate(
             // We need to consider the bounds on the impl to distinguish functions of the same name
             // for a type.
             let predicates = db.generic_predicates(impl_id.into());
-            predicates
+            let valid = predicates
                 .iter()
                 .map(|predicate| {
                     let (p, b) = predicate
@@ -1260,12 +1336,16 @@ fn is_valid_fn_candidate(
                 // It's ok to get ambiguity here, as we may not have enough information to prove
                 // obligations. We'll check if the user is calling the selected method properly
                 // later anyway.
-                .all(|p| table.try_obligation(p.cast(Interner)).is_some())
+                .all(|p| table.try_obligation(p.cast(Interner)).is_some());
+            match valid {
+                true => IsValidCandidate::Yes,
+                false => IsValidCandidate::No,
+            }
         } else {
             // For `ItemContainerId::TraitId`, we check if `self_ty` implements the trait in
             // `iterate_trait_method_candidates()`.
             // For others, this function shouldn't be called.
-            true
+            IsValidCandidate::Yes
         }
     })
 }
diff --git a/crates/hir-ty/src/tests.rs b/crates/hir-ty/src/tests.rs
index ebbc541014..ba5d9c2412 100644
--- a/crates/hir-ty/src/tests.rs
+++ b/crates/hir-ty/src/tests.rs
@@ -94,18 +94,19 @@ fn check_impl(ra_fixture: &str, allow_none: bool, only_types: bool, display_sour
                 types.insert(file_range, expected.trim_start_matches("type: ").to_string());
             } else if expected.starts_with("expected") {
                 mismatches.insert(file_range, expected);
-            } else if expected.starts_with("adjustments: ") {
+            } else if expected.starts_with("adjustments:") {
                 adjustments.insert(
                     file_range,
                     expected
-                        .trim_start_matches("adjustments: ")
+                        .trim_start_matches("adjustments:")
+                        .trim()
                         .split(',')
                         .map(|it| it.trim().to_string())
                         .filter(|it| !it.is_empty())
                         .collect(),
                 );
             } else {
-                panic!("unexpected annotation: {}", expected);
+                panic!("unexpected annotation: {expected}");
             }
             had_annotations = true;
         }
@@ -176,17 +177,17 @@ fn check_impl(ra_fixture: &str, allow_none: bool, only_types: bool, display_sour
                 assert_eq!(actual, expected);
             }
             if let Some(expected) = adjustments.remove(&range) {
-                if let Some(adjustments) = inference_result.expr_adjustments.get(&expr) {
-                    assert_eq!(
-                        expected,
-                        adjustments
-                            .iter()
-                            .map(|Adjustment { kind, .. }| format!("{:?}", kind))
-                            .collect::<Vec<_>>()
-                    );
-                } else {
-                    panic!("expected {:?} adjustments, found none", expected);
-                }
+                let adjustments = inference_result
+                    .expr_adjustments
+                    .get(&expr)
+                    .map_or_else(Default::default, |it| &**it);
+                assert_eq!(
+                    expected,
+                    adjustments
+                        .iter()
+                        .map(|Adjustment { kind, .. }| format!("{kind:?}"))
+                        .collect::<Vec<_>>()
+                );
             }
         }
 
diff --git a/crates/hir-ty/src/tests/coercion.rs b/crates/hir-ty/src/tests/coercion.rs
index 7e3aecc2ae..3e110abaf4 100644
--- a/crates/hir-ty/src/tests/coercion.rs
+++ b/crates/hir-ty/src/tests/coercion.rs
@@ -807,3 +807,37 @@ fn main() {
         "#,
     );
 }
+
+#[test]
+fn adjust_comparison_arguments() {
+    check_no_mismatches(
+        r"
+//- minicore: eq
+struct Struct;
+impl core::cmp::PartialEq for Struct {
+    fn eq(&self, other: &Self) -> bool { true }
+}
+fn test() {
+    Struct == Struct;
+ // ^^^^^^ adjustments: Borrow(Ref(Not))
+           // ^^^^^^ adjustments: Borrow(Ref(Not))
+}",
+    );
+}
+
+#[test]
+fn adjust_assign_lhs() {
+    check_no_mismatches(
+        r"
+//- minicore: add
+struct Struct;
+impl core::ops::AddAssign for Struct {
+    fn add_assign(&mut self, other: Self) {}
+}
+fn test() {
+    Struct += Struct;
+ // ^^^^^^ adjustments: Borrow(Ref(Mut))
+           // ^^^^^^ adjustments:
+}",
+    );
+}
diff --git a/crates/hir-ty/src/tests/incremental.rs b/crates/hir-ty/src/tests/incremental.rs
index 3e08e83e89..073d6d9be2 100644
--- a/crates/hir-ty/src/tests/incremental.rs
+++ b/crates/hir-ty/src/tests/incremental.rs
@@ -24,7 +24,7 @@ fn typing_whitespace_inside_a_function_should_not_invalidate_types() {
                 db.infer(def);
             });
         });
-        assert!(format!("{:?}", events).contains("infer"))
+        assert!(format!("{events:?}").contains("infer"))
     }
 
     let new_text = "
@@ -46,6 +46,6 @@ fn typing_whitespace_inside_a_function_should_not_invalidate_types() {
                 db.infer(def);
             });
         });
-        assert!(!format!("{:?}", events).contains("infer"), "{:#?}", events)
+        assert!(!format!("{events:?}").contains("infer"), "{events:#?}")
     }
 }
diff --git a/crates/hir-ty/src/tests/macros.rs b/crates/hir-ty/src/tests/macros.rs
index b3adafaafd..8b75ec842a 100644
--- a/crates/hir-ty/src/tests/macros.rs
+++ b/crates/hir-ty/src/tests/macros.rs
@@ -849,7 +849,7 @@ fn main() {
   //^^^^^^^^^^^^^^^^^ RegisterBlock
 }
     "#;
-    let fixture = format!("{}\n//- /foo.rs\n{}", fixture, data);
+    let fixture = format!("{fixture}\n//- /foo.rs\n{data}");
 
     {
         let _b = bench("include macro");
diff --git a/crates/hir-ty/src/tests/method_resolution.rs b/crates/hir-ty/src/tests/method_resolution.rs
index 5d76d185ff..6c7a532997 100644
--- a/crates/hir-ty/src/tests/method_resolution.rs
+++ b/crates/hir-ty/src/tests/method_resolution.rs
@@ -1867,3 +1867,53 @@ fn g<T: Trait>(a: T) {
         "#,
     );
 }
+
+#[test]
+fn incoherent_impls() {
+    check(
+        r#"
+//- minicore: error, send
+pub struct Box<T>(T);
+use core::error::Error;
+
+#[rustc_allow_incoherent_impl]
+impl dyn Error {
+    pub fn downcast<T: Error + 'static>(self: Box<Self>) -> Result<Box<T>, Box<dyn Error>> {
+        loop {}
+    }
+}
+#[rustc_allow_incoherent_impl]
+impl dyn Error + Send {
+    /// Attempts to downcast the box to a concrete type.
+    pub fn downcast<T: Error + 'static>(self: Box<Self>) -> Result<Box<T>, Box<dyn Error + Send>> {
+        let err: Box<dyn Error> = self;
+                               // ^^^^ expected Box<dyn Error>, got Box<dyn Error + Send>
+                               // FIXME, type mismatch should not occur
+        <dyn Error>::downcast(err).map_err(|_| loop {})
+      //^^^^^^^^^^^^^^^^^^^^^ type: fn downcast<{unknown}>(Box<dyn Error>) -> Result<Box<{unknown}>, Box<dyn Error>>
+    }
+}
+"#,
+    );
+}
+
+#[test]
+fn fallback_private_methods() {
+    check(
+        r#"
+mod module {
+    pub struct Struct;
+
+    impl Struct {
+        fn func(&self) {}
+    }
+}
+
+fn foo() {
+    let s = module::Struct;
+    s.func();
+  //^^^^^^^^ type: ()
+}
+"#,
+    );
+}
diff --git a/crates/hir-ty/src/tests/patterns.rs b/crates/hir-ty/src/tests/patterns.rs
index 74de33117e..9333e26935 100644
--- a/crates/hir-ty/src/tests/patterns.rs
+++ b/crates/hir-ty/src/tests/patterns.rs
@@ -1080,3 +1080,15 @@ fn my_fn(#[cfg(feature = "feature")] u8: u8, u32: u32) {}
 "#,
     );
 }
+
+#[test]
+fn var_args() {
+    check_types(
+        r#"
+#[lang = "va_list"]
+pub struct VaListImpl<'f>;
+fn my_fn(foo: ...) {}
+       //^^^ VaListImpl
+"#,
+    );
+}
diff --git a/crates/hir-ty/src/tests/regression.rs b/crates/hir-ty/src/tests/regression.rs
index 4e46397459..de6ae7fff8 100644
--- a/crates/hir-ty/src/tests/regression.rs
+++ b/crates/hir-ty/src/tests/regression.rs
@@ -1723,3 +1723,24 @@ fn bar() -> ControlFlow<(), ()> {
 "#,
     );
 }
+
+#[test]
+fn assoc_type_shorthand_with_gats_in_binders() {
+    // c.f. test `issue_4885()`
+    check_no_mismatches(
+        r#"
+trait Gats {
+    type Assoc<T>;
+}
+trait Foo<T> {}
+
+struct Bar<'a, B: Gats, A> {
+    field: &'a dyn Foo<B::Assoc<A>>,
+}
+
+fn foo(b: Bar) {
+    let _ = b.field;
+}
+"#,
+    );
+}
diff --git a/crates/hir-ty/src/tests/simple.rs b/crates/hir-ty/src/tests/simple.rs
index d7431443b8..146145523b 100644
--- a/crates/hir-ty/src/tests/simple.rs
+++ b/crates/hir-ty/src/tests/simple.rs
@@ -2064,17 +2064,17 @@ fn fn_pointer_return() {
 fn block_modifiers_smoke_test() {
     check_infer(
         r#"
-//- minicore: future
+//- minicore: future, try
 async fn main() {
     let x = unsafe { 92 };
     let y = async { async { () }.await };
-    let z = try { () };
+    let z: core::ops::ControlFlow<(), _> = try { () };
     let w = const { 92 };
     let t = 'a: { 92 };
 }
         "#,
         expect![[r#"
-            16..162 '{     ...2 }; }': ()
+            16..193 '{     ...2 }; }': ()
             26..27 'x': i32
             30..43 'unsafe { 92 }': i32
             30..43 'unsafe { 92 }': i32
@@ -2086,17 +2086,17 @@ async fn main() {
             65..77 'async { () }': impl Future<Output = ()>
             65..83 'async ....await': ()
             73..75 '()': ()
-            95..96 'z': {unknown}
-            99..109 'try { () }': ()
-            99..109 'try { () }': {unknown}
-            105..107 '()': ()
-            119..120 'w': i32
-            123..135 'const { 92 }': i32
-            123..135 'const { 92 }': i32
-            131..133 '92': i32
-            145..146 't': i32
-            149..159 ''a: { 92 }': i32
-            155..157 '92': i32
+            95..96 'z': ControlFlow<(), ()>
+            130..140 'try { () }': ()
+            130..140 'try { () }': ControlFlow<(), ()>
+            136..138 '()': ()
+            150..151 'w': i32
+            154..166 'const { 92 }': i32
+            154..166 'const { 92 }': i32
+            162..164 '92': i32
+            176..177 't': i32
+            180..190 ''a: { 92 }': i32
+            186..188 '92': i32
         "#]],
     )
 }
diff --git a/crates/hir-ty/src/tests/traits.rs b/crates/hir-ty/src/tests/traits.rs
index 3d7194b6f4..d01fe06328 100644
--- a/crates/hir-ty/src/tests/traits.rs
+++ b/crates/hir-ty/src/tests/traits.rs
@@ -1388,6 +1388,22 @@ fn foo<const C: u8, T>() -> (impl FnOnce(&str, T), impl Trait<u8>) {
     );
 }
 
+#[test]
+fn return_pos_impl_trait_in_projection() {
+    // Note that the unused type param `X` is significant; see #13307.
+    check_no_mismatches(
+        r#"
+//- minicore: sized
+trait Future { type Output; }
+impl Future for () { type Output = i32; }
+type Foo<F> = (<F as Future>::Output, F);
+fn foo<X>() -> Foo<impl Future<Output = ()>> {
+    (0, ())
+}
+"#,
+    )
+}
+
 #[test]
 fn dyn_trait() {
     check_infer(
@@ -4084,3 +4100,68 @@ where
     "#,
     );
 }
+
+#[test]
+fn bin_op_with_scalar_fallback() {
+    // Extra impls are significant so that chalk doesn't give us definite guidances.
+    check_types(
+        r#"
+//- minicore: add
+use core::ops::Add;
+
+struct Vec2<T>(T, T);
+
+impl Add for Vec2<i32> {
+    type Output = Self;
+    fn add(self, rhs: Self) -> Self::Output { loop {} }
+}
+impl Add for Vec2<u32> {
+    type Output = Self;
+    fn add(self, rhs: Self) -> Self::Output { loop {} }
+}
+impl Add for Vec2<f32> {
+    type Output = Self;
+    fn add(self, rhs: Self) -> Self::Output { loop {} }
+}
+impl Add for Vec2<f64> {
+    type Output = Self;
+    fn add(self, rhs: Self) -> Self::Output { loop {} }
+}
+
+fn test() {
+    let a = Vec2(1, 2);
+    let b = Vec2(3, 4);
+    let c = a + b;
+      //^ Vec2<i32>
+    let a = Vec2(1., 2.);
+    let b = Vec2(3., 4.);
+    let c = a + b;
+      //^ Vec2<f64>
+}
+"#,
+    );
+}
+
+#[test]
+fn trait_method_with_scalar_fallback() {
+    check_types(
+        r#"
+trait Trait {
+    type Output;
+    fn foo(&self) -> Self::Output;
+}
+impl<T> Trait for T {
+    type Output = T;
+    fn foo(&self) -> Self::Output { loop {} }
+}
+fn test() {
+    let a = 42;
+    let b = a.foo();
+      //^ i32
+    let a = 3.14;
+    let b = a.foo();
+      //^ f64
+}
+"#,
+    );
+}
diff --git a/crates/hir-ty/src/tls.rs b/crates/hir-ty/src/tls.rs
index 92711a24fe..b7e6ee6740 100644
--- a/crates/hir-ty/src/tls.rs
+++ b/crates/hir-ty/src/tls.rs
@@ -67,12 +67,12 @@ impl DebugContext<'_> {
         let trait_ref = projection_ty.trait_ref(self.0);
         let trait_params = trait_ref.substitution.as_slice(Interner);
         let self_ty = trait_ref.self_type_parameter(Interner);
-        write!(fmt, "<{:?} as {}", self_ty, trait_name)?;
+        write!(fmt, "<{self_ty:?} as {trait_name}")?;
         if trait_params.len() > 1 {
             write!(
                 fmt,
                 "<{}>",
-                trait_params[1..].iter().format_with(", ", |x, f| f(&format_args!("{:?}", x))),
+                trait_params[1..].iter().format_with(", ", |x, f| f(&format_args!("{x:?}"))),
             )?;
         }
         write!(fmt, ">::{}", type_alias_data.name)?;
@@ -83,7 +83,7 @@ impl DebugContext<'_> {
             write!(
                 fmt,
                 "<{}>",
-                proj_params.iter().format_with(", ", |x, f| f(&format_args!("{:?}", x))),
+                proj_params.iter().format_with(", ", |x, f| f(&format_args!("{x:?}"))),
             )?;
         }
 
@@ -105,9 +105,9 @@ impl DebugContext<'_> {
             }
         };
         match def {
-            CallableDefId::FunctionId(_) => write!(fmt, "{{fn {}}}", name),
+            CallableDefId::FunctionId(_) => write!(fmt, "{{fn {name}}}"),
             CallableDefId::StructId(_) | CallableDefId::EnumVariantId(_) => {
-                write!(fmt, "{{ctor {}}}", name)
+                write!(fmt, "{{ctor {name}}}")
             }
         }
     }
diff --git a/crates/hir-ty/src/traits.rs b/crates/hir-ty/src/traits.rs
index c425f35acf..778a6b8204 100644
--- a/crates/hir-ty/src/traits.rs
+++ b/crates/hir-ty/src/traits.rs
@@ -18,7 +18,7 @@ use crate::{
 };
 
 /// This controls how much 'time' we give the Chalk solver before giving up.
-const CHALK_SOLVER_FUEL: i32 = 100;
+const CHALK_SOLVER_FUEL: i32 = 1000;
 
 #[derive(Debug, Copy, Clone)]
 pub(crate) struct ChalkContext<'a> {
@@ -55,13 +55,10 @@ impl TraitEnvironment {
         }
     }
 
-    pub fn traits_in_scope_from_clauses<'a>(
-        &'a self,
-        ty: Ty,
-    ) -> impl Iterator<Item = TraitId> + 'a {
+    pub fn traits_in_scope_from_clauses(&self, ty: Ty) -> impl Iterator<Item = TraitId> + '_ {
         self.traits_from_clauses
             .iter()
-            .filter_map(move |(self_ty, trait_id)| (*self_ty == ty).then(|| *trait_id))
+            .filter_map(move |(self_ty, trait_id)| (*self_ty == ty).then_some(*trait_id))
     }
 }
 
@@ -130,7 +127,7 @@ fn solve(
 
     let mut solve = || {
         let _ctx = if is_chalk_debug() || is_chalk_print() {
-            Some(panic_context::enter(format!("solving {:?}", goal)))
+            Some(panic_context::enter(format!("solving {goal:?}")))
         } else {
             None
         };
diff --git a/crates/hir-ty/src/utils.rs b/crates/hir-ty/src/utils.rs
index e54bcb421a..9893566bd5 100644
--- a/crates/hir-ty/src/utils.rs
+++ b/crates/hir-ty/src/utils.rs
@@ -17,7 +17,7 @@ use hir_def::{
     ConstParamId, FunctionId, GenericDefId, ItemContainerId, Lookup, TraitId, TypeAliasId,
     TypeOrConstParamId, TypeParamId,
 };
-use hir_expand::name::{known, Name};
+use hir_expand::name::Name;
 use itertools::Either;
 use rustc_hash::FxHashSet;
 use smallvec::{smallvec, SmallVec};
@@ -184,9 +184,7 @@ pub(crate) struct Generics {
 }
 
 impl Generics {
-    pub(crate) fn iter_id<'a>(
-        &'a self,
-    ) -> impl Iterator<Item = Either<TypeParamId, ConstParamId>> + 'a {
+    pub(crate) fn iter_id(&self) -> impl Iterator<Item = Either<TypeParamId, ConstParamId>> + '_ {
         self.iter().map(|(id, data)| match data {
             TypeOrConstParamData::TypeParamData(_) => Either::Left(TypeParamId::from_unchecked(id)),
             TypeOrConstParamData::ConstParamData(_) => {
@@ -216,9 +214,9 @@ impl Generics {
     }
 
     /// Iterator over types and const params of parent.
-    pub(crate) fn iter_parent<'a>(
-        &'a self,
-    ) -> impl DoubleEndedIterator<Item = (TypeOrConstParamId, &'a TypeOrConstParamData)> + 'a {
+    pub(crate) fn iter_parent(
+        &self,
+    ) -> impl DoubleEndedIterator<Item = (TypeOrConstParamId, &TypeOrConstParamData)> {
         self.parent_generics().into_iter().flat_map(|it| {
             let to_toc_id =
                 move |(local_id, p)| (TypeOrConstParamId { parent: it.def, local_id }, p);
@@ -335,54 +333,18 @@ pub fn is_fn_unsafe_to_call(db: &dyn HirDatabase, func: FunctionId) -> bool {
             // Function in an `extern` block are always unsafe to call, except when it has
             // `"rust-intrinsic"` ABI there are a few exceptions.
             let id = block.lookup(db.upcast()).id;
-            !matches!(
-                id.item_tree(db.upcast())[id.value].abi.as_deref(),
-                Some("rust-intrinsic") if !is_intrinsic_fn_unsafe(&data.name)
-            )
+
+            let is_intrinsic =
+                id.item_tree(db.upcast())[id.value].abi.as_deref() == Some("rust-intrinsic");
+
+            if is_intrinsic {
+                // Intrinsics are unsafe unless they have the rustc_safe_intrinsic attribute
+                !data.attrs.by_key("rustc_safe_intrinsic").exists()
+            } else {
+                // Extern items are always unsafe
+                true
+            }
         }
         _ => false,
     }
 }
-
-/// Returns `true` if the given intrinsic is unsafe to call, or false otherwise.
-fn is_intrinsic_fn_unsafe(name: &Name) -> bool {
-    // Should be kept in sync with https://github.com/rust-lang/rust/blob/532d2b14c05f9bc20b2d27cbb5f4550d28343a36/compiler/rustc_typeck/src/check/intrinsic.rs#L72-L106
-    ![
-        known::abort,
-        known::add_with_overflow,
-        known::bitreverse,
-        known::black_box,
-        known::bswap,
-        known::caller_location,
-        known::ctlz,
-        known::ctpop,
-        known::cttz,
-        known::discriminant_value,
-        known::forget,
-        known::likely,
-        known::maxnumf32,
-        known::maxnumf64,
-        known::min_align_of,
-        known::minnumf32,
-        known::minnumf64,
-        known::mul_with_overflow,
-        known::needs_drop,
-        known::ptr_guaranteed_eq,
-        known::ptr_guaranteed_ne,
-        known::rotate_left,
-        known::rotate_right,
-        known::rustc_peek,
-        known::saturating_add,
-        known::saturating_sub,
-        known::size_of,
-        known::sub_with_overflow,
-        known::type_id,
-        known::type_name,
-        known::unlikely,
-        known::variant_count,
-        known::wrapping_add,
-        known::wrapping_mul,
-        known::wrapping_sub,
-    ]
-    .contains(name)
-}
diff --git a/crates/hir/src/attrs.rs b/crates/hir/src/attrs.rs
index 0bd3793400..54425d69b6 100644
--- a/crates/hir/src/attrs.rs
+++ b/crates/hir/src/attrs.rs
@@ -148,7 +148,7 @@ fn resolve_doc_path(
 
     let modpath = {
         // FIXME: this is not how we should get a mod path here
-        let ast_path = ast::SourceFile::parse(&format!("type T = {};", link))
+        let ast_path = ast::SourceFile::parse(&format!("type T = {link};"))
             .syntax_node()
             .descendants()
             .find_map(ast::Path::cast)?;
diff --git a/crates/hir/src/diagnostics.rs b/crates/hir/src/diagnostics.rs
index c5dc60f1ec..54d43fa8dc 100644
--- a/crates/hir/src/diagnostics.rs
+++ b/crates/hir/src/diagnostics.rs
@@ -10,7 +10,7 @@ use hir_def::path::ModPath;
 use hir_expand::{name::Name, HirFileId, InFile};
 use syntax::{ast, AstPtr, SyntaxNodePtr, TextRange};
 
-use crate::{MacroKind, Type};
+use crate::{AssocItem, Field, MacroKind, Type};
 
 macro_rules! diagnostics {
     ($($diag:ident,)*) => {
@@ -41,6 +41,8 @@ diagnostics![
     MissingMatchArms,
     MissingUnsafe,
     NoSuchField,
+    PrivateAssocItem,
+    PrivateField,
     ReplaceFilterMapNextWithFindMap,
     TypeMismatch,
     UnimplementedBuiltinMacro,
@@ -121,6 +123,19 @@ pub struct NoSuchField {
     pub field: InFile<AstPtr<ast::RecordExprField>>,
 }
 
+#[derive(Debug)]
+pub struct PrivateAssocItem {
+    pub expr_or_pat:
+        InFile<Either<AstPtr<ast::Expr>, Either<AstPtr<ast::Pat>, AstPtr<ast::SelfParam>>>>,
+    pub item: AssocItem,
+}
+
+#[derive(Debug)]
+pub struct PrivateField {
+    pub expr: InFile<AstPtr<ast::Expr>>,
+    pub field: Field,
+}
+
 #[derive(Debug)]
 pub struct BreakOutsideOfLoop {
     pub expr: InFile<AstPtr<ast::Expr>>,
diff --git a/crates/hir/src/display.rs b/crates/hir/src/display.rs
index 27b2f445d7..5a4b2f3344 100644
--- a/crates/hir/src/display.rs
+++ b/crates/hir/src/display.rs
@@ -79,7 +79,7 @@ impl HirDisplay for Function {
                 }
             }
             match name {
-                Some(name) => write!(f, "{}: ", name)?,
+                Some(name) => write!(f, "{name}: ")?,
                 None => f.write_str("_: ")?,
             }
             // FIXME: Use resolved `param.ty` or raw `type_ref`?
@@ -327,7 +327,7 @@ fn write_generic_params(
                         continue;
                     }
                     delim(f)?;
-                    write!(f, "{}", name)?;
+                    write!(f, "{name}")?;
                     if let Some(default) = &ty.default {
                         f.write_str(" = ")?;
                         default.hir_fmt(f)?;
@@ -335,7 +335,7 @@ fn write_generic_params(
                 }
                 TypeOrConstParamData::ConstParamData(c) => {
                     delim(f)?;
-                    write!(f, "const {}: ", name)?;
+                    write!(f, "const {name}: ")?;
                     c.ty.hir_fmt(f)?;
                 }
             }
@@ -372,7 +372,7 @@ fn write_where_clause(def: GenericDefId, f: &mut HirFormatter<'_>) -> Result<(),
         WherePredicateTypeTarget::TypeRef(ty) => ty.hir_fmt(f),
         WherePredicateTypeTarget::TypeOrConstParam(id) => {
             match &params.type_or_consts[*id].name() {
-                Some(name) => write!(f, "{}", name),
+                Some(name) => write!(f, "{name}"),
                 None => f.write_str("{unnamed}"),
             }
         }
@@ -424,7 +424,7 @@ fn write_where_clause(def: GenericDefId, f: &mut HirFormatter<'_>) -> Result<(),
                         if idx != 0 {
                             f.write_str(", ")?;
                         }
-                        write!(f, "{}", lifetime)?;
+                        write!(f, "{lifetime}")?;
                     }
                     f.write_str("> ")?;
                     write_target(target, f)?;
@@ -447,7 +447,7 @@ impl HirDisplay for Const {
         let data = f.db.const_data(self.id);
         f.write_str("const ")?;
         match &data.name {
-            Some(name) => write!(f, "{}: ", name)?,
+            Some(name) => write!(f, "{name}: ")?,
             None => f.write_str("_: ")?,
         }
         data.type_ref.hir_fmt(f)?;
@@ -511,9 +511,9 @@ impl HirDisplay for Module {
     fn hir_fmt(&self, f: &mut HirFormatter<'_>) -> Result<(), HirDisplayError> {
         // FIXME: Module doesn't have visibility saved in data.
         match self.name(f.db) {
-            Some(name) => write!(f, "mod {}", name),
+            Some(name) => write!(f, "mod {name}"),
             None if self.is_crate_root(f.db) => match self.krate(f.db).display_name(f.db) {
-                Some(name) => write!(f, "extern crate {}", name),
+                Some(name) => write!(f, "extern crate {name}"),
                 None => f.write_str("extern crate {unknown}"),
             },
             None => f.write_str("mod {unnamed}"),
diff --git a/crates/hir/src/lib.rs b/crates/hir/src/lib.rs
index cbbcaebb42..08fd4453df 100644
--- a/crates/hir/src/lib.rs
+++ b/crates/hir/src/lib.rs
@@ -39,12 +39,13 @@ use arrayvec::ArrayVec;
 use base_db::{CrateDisplayName, CrateId, CrateOrigin, Edition, FileId, ProcMacroKind};
 use either::Either;
 use hir_def::{
-    adt::{ReprData, VariantData},
+    adt::VariantData,
     body::{BodyDiagnostic, SyntheticSyntax},
-    expr::{BindingAnnotation, LabelId, Pat, PatId},
+    expr::{BindingAnnotation, ExprOrPatId, LabelId, Pat, PatId},
     generics::{TypeOrConstParamData, TypeParamProvenance},
     item_tree::ItemTreeNode,
     lang_item::LangItemTarget,
+    layout::{Layout, LayoutError, ReprOptions},
     nameres::{self, diagnostics::DefDiagnostic},
     per_ns::PerNs,
     resolver::{HasResolver, Resolver},
@@ -59,6 +60,7 @@ use hir_ty::{
     all_super_traits, autoderef,
     consteval::{unknown_const_as_generic, ComputedExpr, ConstEvalError, ConstExt},
     diagnostics::BodyValidationDiagnostic,
+    layout::layout_of_ty,
     method_resolution::{self, TyFingerprint},
     primitive::UintTy,
     traits::FnTrait,
@@ -72,7 +74,7 @@ use once_cell::unsync::Lazy;
 use rustc_hash::FxHashSet;
 use stdx::{impl_from, never};
 use syntax::{
-    ast::{self, Expr, HasAttrs as _, HasDocComments, HasName},
+    ast::{self, HasAttrs as _, HasDocComments, HasName},
     AstNode, AstPtr, SmolStr, SyntaxNodePtr, TextRange, T,
 };
 
@@ -83,9 +85,10 @@ pub use crate::{
     diagnostics::{
         AnyDiagnostic, BreakOutsideOfLoop, InactiveCode, IncorrectCase, InvalidDeriveTarget,
         MacroError, MalformedDerive, MismatchedArgCount, MissingFields, MissingMatchArms,
-        MissingUnsafe, NoSuchField, ReplaceFilterMapNextWithFindMap, TypeMismatch,
-        UnimplementedBuiltinMacro, UnresolvedExternCrate, UnresolvedImport, UnresolvedMacroCall,
-        UnresolvedModule, UnresolvedProcMacro,
+        MissingUnsafe, NoSuchField, PrivateAssocItem, PrivateField,
+        ReplaceFilterMapNextWithFindMap, TypeMismatch, UnimplementedBuiltinMacro,
+        UnresolvedExternCrate, UnresolvedImport, UnresolvedMacroCall, UnresolvedModule,
+        UnresolvedProcMacro,
     },
     has_source::HasSource,
     semantics::{PathResolution, Semantics, SemanticsScope, TypeInfo, VisibleTraits},
@@ -112,12 +115,20 @@ pub use {
         path::{ModPath, PathKind},
         type_ref::{Mutability, TypeRef},
         visibility::Visibility,
+        // FIXME: This is here since it is input of a method in `HirWrite`
+        // and things outside of hir need to implement that trait. We probably
+        // should move whole `hir_ty::display` to this crate so we will become
+        // able to use `ModuleDef` or `Definition` instead of `ModuleDefId`.
+        ModuleDefId,
     },
     hir_expand::{
         name::{known, Name},
         ExpandResult, HirFileId, InFile, MacroFile, Origin,
     },
-    hir_ty::{display::HirDisplay, PointerCast, Safety},
+    hir_ty::{
+        display::{HirDisplay, HirWrite},
+        PointerCast, Safety,
+    },
 };
 
 // These are negative re-exports: pub using these names is forbidden, they
@@ -597,7 +608,7 @@ impl Module {
     pub fn legacy_macros(self, db: &dyn HirDatabase) -> Vec<Macro> {
         let def_map = self.id.def_map(db.upcast());
         let scope = &def_map[self.id.local_id].scope;
-        scope.legacy_macros().flat_map(|(_, it)| it).map(|&it| MacroId::from(it).into()).collect()
+        scope.legacy_macros().flat_map(|(_, it)| it).map(|&it| it.into()).collect()
     }
 
     pub fn impl_defs(self, db: &dyn HirDatabase) -> Vec<Impl> {
@@ -803,7 +814,7 @@ fn precise_macro_call_location(
                 .doc_comments_and_attrs()
                 .nth((*invoc_attr_index) as usize)
                 .and_then(Either::left)
-                .unwrap_or_else(|| panic!("cannot find attribute #{}", invoc_attr_index));
+                .unwrap_or_else(|| panic!("cannot find attribute #{invoc_attr_index}"));
 
             (
                 ast_id.with_value(SyntaxNodePtr::from(AstPtr::new(&attr))),
@@ -844,6 +855,10 @@ impl Field {
         self.parent.variant_data(db).fields()[self.id].name.clone()
     }
 
+    pub fn index(&self) -> usize {
+        u32::from(self.id.into_raw()) as usize
+    }
+
     /// Returns the type as in the signature of the struct (i.e., with
     /// placeholder types for type parameters). Only use this in the context of
     /// the field definition.
@@ -859,6 +874,10 @@ impl Field {
         Type::new(db, var_id, ty)
     }
 
+    pub fn layout(&self, db: &dyn HirDatabase) -> Result<Layout, LayoutError> {
+        layout_of_ty(db, &self.ty(db).ty, self.parent.module(db).krate().into())
+    }
+
     pub fn parent_def(&self, _db: &dyn HirDatabase) -> VariantDef {
         self.parent
     }
@@ -900,7 +919,7 @@ impl Struct {
         Type::from_def(db, self.id)
     }
 
-    pub fn repr(self, db: &dyn HirDatabase) -> Option<ReprData> {
+    pub fn repr(self, db: &dyn HirDatabase) -> Option<ReprOptions> {
         db.struct_data(self.id).repr.clone()
     }
 
@@ -984,8 +1003,30 @@ impl Enum {
         Type::new_for_crate(
             self.id.lookup(db.upcast()).container.krate(),
             TyBuilder::builtin(match db.enum_data(self.id).variant_body_type() {
-                Either::Left(builtin) => hir_def::builtin_type::BuiltinType::Int(builtin),
-                Either::Right(builtin) => hir_def::builtin_type::BuiltinType::Uint(builtin),
+                hir_def::layout::IntegerType::Pointer(sign) => match sign {
+                    true => hir_def::builtin_type::BuiltinType::Int(
+                        hir_def::builtin_type::BuiltinInt::Isize,
+                    ),
+                    false => hir_def::builtin_type::BuiltinType::Uint(
+                        hir_def::builtin_type::BuiltinUint::Usize,
+                    ),
+                },
+                hir_def::layout::IntegerType::Fixed(i, sign) => match sign {
+                    true => hir_def::builtin_type::BuiltinType::Int(match i {
+                        hir_def::layout::Integer::I8 => hir_def::builtin_type::BuiltinInt::I8,
+                        hir_def::layout::Integer::I16 => hir_def::builtin_type::BuiltinInt::I16,
+                        hir_def::layout::Integer::I32 => hir_def::builtin_type::BuiltinInt::I32,
+                        hir_def::layout::Integer::I64 => hir_def::builtin_type::BuiltinInt::I64,
+                        hir_def::layout::Integer::I128 => hir_def::builtin_type::BuiltinInt::I128,
+                    }),
+                    false => hir_def::builtin_type::BuiltinType::Uint(match i {
+                        hir_def::layout::Integer::I8 => hir_def::builtin_type::BuiltinUint::U8,
+                        hir_def::layout::Integer::I16 => hir_def::builtin_type::BuiltinUint::U16,
+                        hir_def::layout::Integer::I32 => hir_def::builtin_type::BuiltinUint::U32,
+                        hir_def::layout::Integer::I64 => hir_def::builtin_type::BuiltinUint::U64,
+                        hir_def::layout::Integer::I128 => hir_def::builtin_type::BuiltinUint::U128,
+                    }),
+                },
             }),
         )
     }
@@ -1042,7 +1083,7 @@ impl Variant {
         db.enum_data(self.parent.id).variants[self.id].variant_data.clone()
     }
 
-    pub fn value(self, db: &dyn HirDatabase) -> Option<Expr> {
+    pub fn value(self, db: &dyn HirDatabase) -> Option<ast::Expr> {
         self.source(db)?.value.expr()
     }
 
@@ -1076,6 +1117,13 @@ impl Adt {
         })
     }
 
+    pub fn layout(self, db: &dyn HirDatabase) -> Result<Layout, LayoutError> {
+        if db.generic_params(self.into()).iter().count() != 0 {
+            return Err(LayoutError::HasPlaceholder);
+        }
+        db.layout_of_adt(self.into(), Substitution::empty(Interner))
+    }
+
     /// Turns this ADT into a type. Any type parameters of the ADT will be
     /// turned into unknown types, which is good for e.g. finding the most
     /// general set of completions, but will not look very nice when printed.
@@ -1306,6 +1354,25 @@ impl DefWithBody {
                         Err(SyntheticSyntax) => (),
                     }
                 }
+                &hir_ty::InferenceDiagnostic::PrivateField { expr, field } => {
+                    let expr = source_map.expr_syntax(expr).expect("unexpected synthetic");
+                    let field = field.into();
+                    acc.push(PrivateField { expr, field }.into())
+                }
+                &hir_ty::InferenceDiagnostic::PrivateAssocItem { id, item } => {
+                    let expr_or_pat = match id {
+                        ExprOrPatId::ExprId(expr) => source_map
+                            .expr_syntax(expr)
+                            .expect("unexpected synthetic")
+                            .map(Either::Left),
+                        ExprOrPatId::PatId(pat) => source_map
+                            .pat_syntax(pat)
+                            .expect("unexpected synthetic")
+                            .map(Either::Right),
+                    };
+                    let item = item.into();
+                    acc.push(PrivateAssocItem { expr_or_pat, item }.into())
+                }
             }
         }
         for (expr, mismatch) in infer.expr_type_mismatches() {
@@ -1492,7 +1559,7 @@ impl Function {
     }
 
     pub fn self_param(self, db: &dyn HirDatabase) -> Option<SelfParam> {
-        self.has_self_param(db).then(|| SelfParam { func: self.id })
+        self.has_self_param(db).then_some(SelfParam { func: self.id })
     }
 
     pub fn assoc_fn_params(self, db: &dyn HirDatabase) -> Vec<Param> {
@@ -2344,17 +2411,19 @@ pub struct DeriveHelper {
 
 impl DeriveHelper {
     pub fn derive(&self) -> Macro {
-        Macro { id: self.derive.into() }
+        Macro { id: self.derive }
     }
 
     pub fn name(&self, db: &dyn HirDatabase) -> Name {
         match self.derive {
-            MacroId::Macro2Id(_) => None,
+            MacroId::Macro2Id(it) => {
+                db.macro2_data(it).helpers.as_deref().and_then(|it| it.get(self.idx)).cloned()
+            }
             MacroId::MacroRulesId(_) => None,
             MacroId::ProcMacroId(proc_macro) => db
                 .proc_macro_data(proc_macro)
                 .helpers
-                .as_ref()
+                .as_deref()
                 .and_then(|it| it.get(self.idx))
                 .cloned(),
         }
@@ -2712,7 +2781,7 @@ impl Impl {
     pub fn all_for_trait(db: &dyn HirDatabase, trait_: Trait) -> Vec<Impl> {
         let krate = trait_.module(db).krate();
         let mut all = Vec::new();
-        for Crate { id } in krate.transitive_reverse_dependencies(db).into_iter() {
+        for Crate { id } in krate.transitive_reverse_dependencies(db) {
             let impls = db.trait_impls_in_crate(id);
             all.extend(impls.for_trait(trait_.id).map(Self::from))
         }
@@ -2857,6 +2926,13 @@ impl Type {
         matches!(self.ty.kind(Interner), TyKind::Scalar(Scalar::Uint(UintTy::Usize)))
     }
 
+    pub fn is_int_or_uint(&self) -> bool {
+        match self.ty.kind(Interner) {
+            TyKind::Scalar(Scalar::Int(_) | Scalar::Uint(_)) => true,
+            _ => false,
+        }
+    }
+
     pub fn remove_ref(&self) -> Option<Type> {
         match &self.ty.kind(Interner) {
             TyKind::Ref(.., ty) => Some(self.derived(ty.clone())),
@@ -3031,7 +3107,7 @@ impl Type {
 
         let adt = adt_id.into();
         match adt {
-            Adt::Struct(s) => matches!(s.repr(db), Some(ReprData { packed: true, .. })),
+            Adt::Struct(s) => s.repr(db).unwrap_or_default().pack.is_some(),
             _ => false,
         }
     }
@@ -3225,7 +3301,7 @@ impl Type {
             with_local_impls.and_then(|b| b.id.containing_block()).into(),
             name,
             method_resolution::LookupMode::MethodCall,
-            &mut |_adj, id| callback(id),
+            &mut |_adj, id, _| callback(id),
         );
     }
 
@@ -3650,6 +3726,13 @@ impl From<ItemInNs> for ScopeDef {
     }
 }
 
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct Adjustment {
+    pub source: Type,
+    pub target: Type,
+    pub kind: Adjust,
+}
+
 #[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
 pub enum Adjust {
     /// Go from ! to any type.
diff --git a/crates/hir/src/semantics.rs b/crates/hir/src/semantics.rs
index 2e1f88ba09..e0d2610391 100644
--- a/crates/hir/src/semantics.rs
+++ b/crates/hir/src/semantics.rs
@@ -2,14 +2,17 @@
 
 mod source_to_def;
 
-use std::{cell::RefCell, fmt, iter, ops};
+use std::{cell::RefCell, fmt, iter, mem, ops};
 
 use base_db::{FileId, FileRange};
+use either::Either;
 use hir_def::{
-    body, macro_id_to_def_id,
+    body,
+    expr::Expr,
+    macro_id_to_def_id,
     resolver::{self, HasResolver, Resolver, TypeNs},
     type_ref::Mutability,
-    AsMacroCall, FunctionId, MacroId, TraitId, VariantId,
+    AsMacroCall, DefWithBodyId, FunctionId, MacroId, TraitId, VariantId,
 };
 use hir_expand::{
     db::AstDatabase,
@@ -29,7 +32,7 @@ use crate::{
     db::HirDatabase,
     semantics::source_to_def::{ChildContainer, SourceToDefCache, SourceToDefCtx},
     source_analyzer::{resolve_hir_path, SourceAnalyzer},
-    Access, Adjust, AutoBorrow, BindingMode, BuiltinAttr, Callable, ConstParam, Crate,
+    Access, Adjust, Adjustment, AutoBorrow, BindingMode, BuiltinAttr, Callable, ConstParam, Crate,
     DeriveHelper, Field, Function, HasSource, HirFileId, Impl, InFile, Label, LifetimeParam, Local,
     Macro, Module, ModuleDef, Name, OverloadedDeref, Path, ScopeDef, ToolModule, Trait, Type,
     TypeAlias, TypeParam, VariantDef,
@@ -334,7 +337,7 @@ impl<'db, DB: HirDatabase> Semantics<'db, DB> {
         self.imp.resolve_trait(trait_)
     }
 
-    pub fn expr_adjustments(&self, expr: &ast::Expr) -> Option<Vec<Adjust>> {
+    pub fn expr_adjustments(&self, expr: &ast::Expr) -> Option<Vec<Adjustment>> {
         self.imp.expr_adjustments(expr)
     }
 
@@ -438,8 +441,7 @@ impl<'db, DB: HirDatabase> Semantics<'db, DB> {
     }
 
     pub fn to_def<T: ToDef>(&self, src: &T) -> Option<T::Def> {
-        let src = self.imp.find_file(src.syntax()).with_value(src).cloned();
-        T::to_def(&self.imp, src)
+        self.imp.to_def(src)
     }
 
     pub fn to_module_def(&self, file: FileId) -> Option<Module> {
@@ -481,6 +483,11 @@ impl<'db, DB: HirDatabase> Semantics<'db, DB> {
     pub fn is_unsafe_ident_pat(&self, ident_pat: &ast::IdentPat) -> bool {
         self.imp.is_unsafe_ident_pat(ident_pat)
     }
+
+    /// Returns `true` if the `node` is inside an `unsafe` context.
+    pub fn is_inside_unsafe(&self, expr: &ast::Expr) -> bool {
+        self.imp.is_inside_unsafe(expr)
+    }
 }
 
 impl<'db> SemanticsImpl<'db> {
@@ -788,7 +795,7 @@ impl<'db> SemanticsImpl<'db> {
                 // requeue the tokens we got from mapping our current token down
                 stack.extend(mapped_tokens);
                 // if the length changed we have found a mapping for the token
-                (stack.len() != len).then(|| ())
+                (stack.len() != len).then_some(())
             };
 
         // Remap the next token in the queue into a macro call its in, if it is not being remapped
@@ -840,7 +847,7 @@ impl<'db> SemanticsImpl<'db> {
                         }
                     };
                     process_expansion_for_token(&mut stack, file_id, None, token.as_ref())
-                } else if let Some(meta) = ast::Meta::cast(parent.clone()) {
+                } else if let Some(meta) = ast::Meta::cast(parent) {
                     // attribute we failed expansion for earlier, this might be a derive invocation
                     // or derive helper attribute
                     let attr = meta.parent_attr()?;
@@ -1067,26 +1074,42 @@ impl<'db> SemanticsImpl<'db> {
         }
     }
 
-    fn expr_adjustments(&self, expr: &ast::Expr) -> Option<Vec<Adjust>> {
+    fn expr_adjustments(&self, expr: &ast::Expr) -> Option<Vec<Adjustment>> {
         let mutability = |m| match m {
             hir_ty::Mutability::Not => Mutability::Shared,
             hir_ty::Mutability::Mut => Mutability::Mut,
         };
-        self.analyze(expr.syntax())?.expr_adjustments(self.db, expr).map(|it| {
+
+        let analyzer = self.analyze(expr.syntax())?;
+
+        let (mut source_ty, _) = analyzer.type_of_expr(self.db, expr)?;
+
+        analyzer.expr_adjustments(self.db, expr).map(|it| {
             it.iter()
-                .map(|adjust| match adjust.kind {
-                    hir_ty::Adjust::NeverToAny => Adjust::NeverToAny,
-                    hir_ty::Adjust::Deref(Some(hir_ty::OverloadedDeref(m))) => {
-                        Adjust::Deref(Some(OverloadedDeref(mutability(m))))
-                    }
-                    hir_ty::Adjust::Deref(None) => Adjust::Deref(None),
-                    hir_ty::Adjust::Borrow(hir_ty::AutoBorrow::RawPtr(m)) => {
-                        Adjust::Borrow(AutoBorrow::RawPtr(mutability(m)))
-                    }
-                    hir_ty::Adjust::Borrow(hir_ty::AutoBorrow::Ref(m)) => {
-                        Adjust::Borrow(AutoBorrow::Ref(mutability(m)))
-                    }
-                    hir_ty::Adjust::Pointer(pc) => Adjust::Pointer(pc),
+                .map(|adjust| {
+                    let target =
+                        Type::new_with_resolver(self.db, &analyzer.resolver, adjust.target.clone());
+                    let kind = match adjust.kind {
+                        hir_ty::Adjust::NeverToAny => Adjust::NeverToAny,
+                        hir_ty::Adjust::Deref(Some(hir_ty::OverloadedDeref(m))) => {
+                            Adjust::Deref(Some(OverloadedDeref(mutability(m))))
+                        }
+                        hir_ty::Adjust::Deref(None) => Adjust::Deref(None),
+                        hir_ty::Adjust::Borrow(hir_ty::AutoBorrow::RawPtr(m)) => {
+                            Adjust::Borrow(AutoBorrow::RawPtr(mutability(m)))
+                        }
+                        hir_ty::Adjust::Borrow(hir_ty::AutoBorrow::Ref(m)) => {
+                            Adjust::Borrow(AutoBorrow::Ref(mutability(m)))
+                        }
+                        hir_ty::Adjust::Pointer(pc) => Adjust::Pointer(pc),
+                    };
+
+                    // Update `source_ty` for the next adjustment
+                    let source = mem::replace(&mut source_ty, target.clone());
+
+                    let adjustment = Adjustment { source, target, kind };
+
+                    adjustment
                 })
                 .collect()
         })
@@ -1198,7 +1221,7 @@ impl<'db> SemanticsImpl<'db> {
         krate
             .dependencies(self.db)
             .into_iter()
-            .find_map(|dep| (dep.name == name).then(|| dep.krate))
+            .find_map(|dep| (dep.name == name).then_some(dep.krate))
     }
 
     fn resolve_variant(&self, record_lit: ast::RecordExpr) -> Option<VariantId> {
@@ -1223,10 +1246,15 @@ impl<'db> SemanticsImpl<'db> {
 
     fn with_ctx<F: FnOnce(&mut SourceToDefCtx<'_, '_>) -> T, T>(&self, f: F) -> T {
         let mut cache = self.s2d_cache.borrow_mut();
-        let mut ctx = SourceToDefCtx { db: self.db, cache: &mut *cache };
+        let mut ctx = SourceToDefCtx { db: self.db, cache: &mut cache };
         f(&mut ctx)
     }
 
+    fn to_def<T: ToDef>(&self, src: &T) -> Option<T::Def> {
+        let src = self.find_file(src.syntax()).with_value(src).cloned();
+        T::to_def(self, src)
+    }
+
     fn to_module_def(&self, file: FileId) -> impl Iterator<Item = Module> {
         self.with_ctx(|ctx| ctx.file_to_def(file)).into_iter().map(Module::from)
     }
@@ -1350,7 +1378,7 @@ impl<'db> SemanticsImpl<'db> {
                 self.cache
                     .borrow()
                     .keys()
-                    .map(|it| format!("{:?}", it))
+                    .map(|it| format!("{it:?}"))
                     .collect::<Vec<_>>()
                     .join(", ")
             )
@@ -1442,6 +1470,56 @@ impl<'db> SemanticsImpl<'db> {
             .map(|ty| ty.original.is_packed(self.db))
             .unwrap_or(false)
     }
+
+    fn is_inside_unsafe(&self, expr: &ast::Expr) -> bool {
+        let item_or_variant = |ancestor: SyntaxNode| {
+            if ast::Item::can_cast(ancestor.kind()) {
+                ast::Item::cast(ancestor).map(Either::Left)
+            } else {
+                ast::Variant::cast(ancestor).map(Either::Right)
+            }
+        };
+        let Some(enclosing_item) = expr.syntax().ancestors().find_map(item_or_variant) else { return false };
+
+        let def = match &enclosing_item {
+            Either::Left(ast::Item::Fn(it)) if it.unsafe_token().is_some() => return true,
+            Either::Left(ast::Item::Fn(it)) => {
+                self.to_def(it).map(<_>::into).map(DefWithBodyId::FunctionId)
+            }
+            Either::Left(ast::Item::Const(it)) => {
+                self.to_def(it).map(<_>::into).map(DefWithBodyId::ConstId)
+            }
+            Either::Left(ast::Item::Static(it)) => {
+                self.to_def(it).map(<_>::into).map(DefWithBodyId::StaticId)
+            }
+            Either::Left(_) => None,
+            Either::Right(it) => self.to_def(it).map(<_>::into).map(DefWithBodyId::VariantId),
+        };
+        let Some(def) = def else { return false };
+        let enclosing_node = enclosing_item.as_ref().either(|i| i.syntax(), |v| v.syntax());
+
+        let (body, source_map) = self.db.body_with_source_map(def);
+
+        let file_id = self.find_file(expr.syntax()).file_id;
+
+        let Some(mut parent) = expr.syntax().parent() else { return false };
+        loop {
+            if &parent == enclosing_node {
+                break false;
+            }
+
+            if let Some(parent) = ast::Expr::cast(parent.clone()) {
+                if let Some(expr_id) = source_map.node_expr(InFile { file_id, value: &parent }) {
+                    if let Expr::Unsafe { .. } = body[expr_id] {
+                        break true;
+                    }
+                }
+            }
+
+            let Some(parent_) = parent.parent() else { break false };
+            parent = parent_;
+        }
+    }
 }
 
 fn macro_call_to_macro_id(
@@ -1600,7 +1678,7 @@ impl<'a> SemanticsScope<'a> {
             self.db,
             def,
             resolution.in_type_ns()?,
-            |name, _, id| cb(name, id.into()),
+            |name, id| cb(name, id.into()),
         )
     }
 }
diff --git a/crates/hir/src/source_analyzer.rs b/crates/hir/src/source_analyzer.rs
index 91ea1c24d1..059b80bcf1 100644
--- a/crates/hir/src/source_analyzer.rs
+++ b/crates/hir/src/source_analyzer.rs
@@ -21,8 +21,8 @@ use hir_def::{
     path::{ModPath, Path, PathKind},
     resolver::{resolver_for_scope, Resolver, TypeNs, ValueNs},
     type_ref::Mutability,
-    AsMacroCall, AssocItemId, DefWithBodyId, FieldId, FunctionId, ItemContainerId, LocalFieldId,
-    Lookup, ModuleDefId, TraitId, VariantId,
+    AsMacroCall, AssocItemId, ConstId, DefWithBodyId, FieldId, FunctionId, ItemContainerId,
+    LocalFieldId, Lookup, ModuleDefId, TraitId, VariantId,
 };
 use hir_expand::{
     builtin_fn_macro::BuiltinFnLikeExpander,
@@ -118,7 +118,7 @@ impl SourceAnalyzer {
     fn expr_id(&self, db: &dyn HirDatabase, expr: &ast::Expr) -> Option<ExprId> {
         let src = match expr {
             ast::Expr::MacroExpr(expr) => {
-                self.expand_expr(db, InFile::new(self.file_id, expr.macro_call()?.clone()))?
+                self.expand_expr(db, InFile::new(self.file_id, expr.macro_call()?))?
             }
             _ => InFile::new(self.file_id, expr.clone()),
         };
@@ -228,7 +228,7 @@ impl SourceAnalyzer {
         db: &dyn HirDatabase,
         pat: &ast::Pat,
     ) -> Option<SmallVec<[Type; 1]>> {
-        let pat_id = self.pat_id(&pat)?;
+        let pat_id = self.pat_id(pat)?;
         let infer = self.infer.as_ref()?;
         Some(
             infer
@@ -270,7 +270,7 @@ impl SourceAnalyzer {
         db: &dyn HirDatabase,
         await_expr: &ast::AwaitExpr,
     ) -> Option<FunctionId> {
-        let mut ty = self.ty_of_expr(db, &await_expr.expr()?.into())?.clone();
+        let mut ty = self.ty_of_expr(db, &await_expr.expr()?)?.clone();
 
         let into_future_trait = self
             .resolver
@@ -316,7 +316,7 @@ impl SourceAnalyzer {
             ast::UnaryOp::Not => name![not],
             ast::UnaryOp::Neg => name![neg],
         };
-        let ty = self.ty_of_expr(db, &prefix_expr.expr()?.into())?;
+        let ty = self.ty_of_expr(db, &prefix_expr.expr()?)?;
 
         let (op_trait, op_fn) = self.lang_trait_fn(db, &lang_item_name, &lang_item_name)?;
         // HACK: subst for all methods coincides with that for their trait because the methods
@@ -331,8 +331,8 @@ impl SourceAnalyzer {
         db: &dyn HirDatabase,
         index_expr: &ast::IndexExpr,
     ) -> Option<FunctionId> {
-        let base_ty = self.ty_of_expr(db, &index_expr.base()?.into())?;
-        let index_ty = self.ty_of_expr(db, &index_expr.index()?.into())?;
+        let base_ty = self.ty_of_expr(db, &index_expr.base()?)?;
+        let index_ty = self.ty_of_expr(db, &index_expr.index()?)?;
 
         let lang_item_name = name![index];
 
@@ -352,8 +352,8 @@ impl SourceAnalyzer {
         binop_expr: &ast::BinExpr,
     ) -> Option<FunctionId> {
         let op = binop_expr.op_kind()?;
-        let lhs = self.ty_of_expr(db, &binop_expr.lhs()?.into())?;
-        let rhs = self.ty_of_expr(db, &binop_expr.rhs()?.into())?;
+        let lhs = self.ty_of_expr(db, &binop_expr.lhs()?)?;
+        let rhs = self.ty_of_expr(db, &binop_expr.rhs()?)?;
 
         let (op_trait, op_fn) = lang_names_for_bin_op(op)
             .and_then(|(name, lang_item)| self.lang_trait_fn(db, &lang_item, &name))?;
@@ -372,7 +372,7 @@ impl SourceAnalyzer {
         db: &dyn HirDatabase,
         try_expr: &ast::TryExpr,
     ) -> Option<FunctionId> {
-        let ty = self.ty_of_expr(db, &try_expr.expr()?.into())?;
+        let ty = self.ty_of_expr(db, &try_expr.expr()?)?;
 
         let op_fn =
             db.lang_item(self.resolver.krate(), name![branch].to_smol_str())?.as_function()?;
@@ -482,7 +482,7 @@ impl SourceAnalyzer {
             let infer = self.infer.as_deref()?;
             if let Some(path_expr) = parent().and_then(ast::PathExpr::cast) {
                 let expr_id = self.expr_id(db, &path_expr.into())?;
-                if let Some(assoc) = infer.assoc_resolutions_for_expr(expr_id) {
+                if let Some((assoc, subs)) = infer.assoc_resolutions_for_expr(expr_id) {
                     let assoc = match assoc {
                         AssocItemId::FunctionId(f_in_trait) => {
                             match infer.type_of_expr.get(expr_id) {
@@ -501,7 +501,9 @@ impl SourceAnalyzer {
                                 }
                             }
                         }
-
+                        AssocItemId::ConstId(const_id) => {
+                            self.resolve_impl_const_or_trait_def(db, const_id, subs).into()
+                        }
                         _ => assoc,
                     };
 
@@ -515,7 +517,7 @@ impl SourceAnalyzer {
                 prefer_value_ns = true;
             } else if let Some(path_pat) = parent().and_then(ast::PathPat::cast) {
                 let pat_id = self.pat_id(&path_pat.into())?;
-                if let Some(assoc) = infer.assoc_resolutions_for_pat(pat_id) {
+                if let Some((assoc, _)) = infer.assoc_resolutions_for_pat(pat_id) {
                     return Some(PathResolution::Def(AssocItem::from(assoc).into()));
                 }
                 if let Some(VariantId::EnumVariantId(variant)) =
@@ -792,6 +794,24 @@ impl SourceAnalyzer {
         method_resolution::lookup_impl_method(db, env, func, substs)
     }
 
+    fn resolve_impl_const_or_trait_def(
+        &self,
+        db: &dyn HirDatabase,
+        const_id: ConstId,
+        subs: Substitution,
+    ) -> ConstId {
+        let krate = self.resolver.krate();
+        let owner = match self.resolver.body_owner() {
+            Some(it) => it,
+            None => return const_id,
+        };
+        let env = owner.as_generic_def_id().map_or_else(
+            || Arc::new(hir_ty::TraitEnvironment::empty(krate)),
+            |d| db.trait_environment(d),
+        );
+        method_resolution::lookup_impl_const(db, env, const_id, subs)
+    }
+
     fn lang_trait_fn(
         &self,
         db: &dyn HirDatabase,
@@ -804,7 +824,7 @@ impl SourceAnalyzer {
     }
 
     fn ty_of_expr(&self, db: &dyn HirDatabase, expr: &ast::Expr) -> Option<&Ty> {
-        self.infer.as_ref()?.type_of_expr.get(self.expr_id(db, &expr)?)
+        self.infer.as_ref()?.type_of_expr.get(self.expr_id(db, expr)?)
     }
 }
 
@@ -967,7 +987,7 @@ fn resolve_hir_path_(
                         db,
                         def,
                         res.in_type_ns()?,
-                        |name, _, id| (name == unresolved.name).then(|| id),
+                        |name, id| (name == unresolved.name).then_some(id),
                     )
                 })
                 .map(TypeAlias::from)
diff --git a/crates/ide-assists/Cargo.toml b/crates/ide-assists/Cargo.toml
index e781c0a016..b9260473b1 100644
--- a/crates/ide-assists/Cargo.toml
+++ b/crates/ide-assists/Cargo.toml
@@ -14,6 +14,7 @@ cov-mark = "2.0.0-pre.1"
 
 itertools = "0.10.5"
 either = "1.7.0"
+smallvec = "1.10.0"
 
 stdx = { path = "../stdx", version = "0.0.0" }
 syntax = { path = "../syntax", version = "0.0.0" }
diff --git a/crates/ide-assists/src/handlers/add_explicit_type.rs b/crates/ide-assists/src/handlers/add_explicit_type.rs
index b5f99726fe..0057f439f1 100644
--- a/crates/ide-assists/src/handlers/add_explicit_type.rs
+++ b/crates/ide-assists/src/handlers/add_explicit_type.rs
@@ -47,7 +47,10 @@ pub(crate) fn add_explicit_type(acc: &mut Assists, ctx: &AssistContext<'_>) -> O
     // Don't enable the assist if there is a type ascription without any placeholders
     if let Some(ty) = &ascribed_ty {
         let mut contains_infer_ty = false;
-        walk_ty(ty, &mut |ty| contains_infer_ty |= matches!(ty, ast::Type::InferType(_)));
+        walk_ty(ty, &mut |ty| {
+            contains_infer_ty |= matches!(ty, ast::Type::InferType(_));
+            false
+        });
         if !contains_infer_ty {
             cov_mark::hit!(add_explicit_type_not_applicable_if_ty_already_specified);
             return None;
diff --git a/crates/ide-assists/src/handlers/add_missing_impl_members.rs b/crates/ide-assists/src/handlers/add_missing_impl_members.rs
index 2b3793659c..161bcc5c8d 100644
--- a/crates/ide-assists/src/handlers/add_missing_impl_members.rs
+++ b/crates/ide-assists/src/handlers/add_missing_impl_members.rs
@@ -107,6 +107,14 @@ fn add_missing_impl_members_inner(
 ) -> Option<()> {
     let _p = profile::span("add_missing_impl_members_inner");
     let impl_def = ctx.find_node_at_offset::<ast::Impl>()?;
+
+    if ctx.token_at_offset().all(|t| {
+        t.parent_ancestors()
+            .any(|s| ast::BlockExpr::can_cast(s.kind()) || ast::ParamList::can_cast(s.kind()))
+    }) {
+        return None;
+    }
+
     let target_scope = ctx.sema.scope(impl_def.syntax())?;
     let trait_ = resolve_target_trait(&ctx.sema, &impl_def)?;
 
@@ -1343,4 +1351,95 @@ impl PartialEq for SomeStruct {
 "#,
         );
     }
+
+    #[test]
+    fn test_ignore_function_body() {
+        check_assist_not_applicable(
+            add_missing_default_members,
+            r#"
+trait Trait {
+    type X;
+    fn foo(&self);
+    fn bar(&self) {}
+}
+
+impl Trait for () {
+    type X = u8;
+    fn foo(&self) {$0
+        let x = 5;
+    }
+}"#,
+        )
+    }
+
+    #[test]
+    fn test_ignore_param_list() {
+        check_assist_not_applicable(
+            add_missing_impl_members,
+            r#"
+trait Trait {
+    type X;
+    fn foo(&self);
+    fn bar(&self);
+}
+
+impl Trait for () {
+    type X = u8;
+    fn foo(&self$0) {
+        let x = 5;
+    }
+}"#,
+        )
+    }
+
+    #[test]
+    fn test_ignore_scope_inside_function() {
+        check_assist_not_applicable(
+            add_missing_impl_members,
+            r#"
+trait Trait {
+    type X;
+    fn foo(&self);
+    fn bar(&self);
+}
+
+impl Trait for () {
+    type X = u8;
+    fn foo(&self) {
+        let x = async {$0 5 };
+    }
+}"#,
+        )
+    }
+
+    #[test]
+    fn test_apply_outside_function() {
+        check_assist(
+            add_missing_default_members,
+            r#"
+trait Trait {
+    type X;
+    fn foo(&self);
+    fn bar(&self) {}
+}
+
+impl Trait for () {
+    type X = u8;
+    fn foo(&self)$0 {}
+}"#,
+            r#"
+trait Trait {
+    type X;
+    fn foo(&self);
+    fn bar(&self) {}
+}
+
+impl Trait for () {
+    type X = u8;
+    fn foo(&self) {}
+
+    $0fn bar(&self) {}
+}"#,
+        )
+    }
 }
diff --git a/crates/ide-assists/src/handlers/add_missing_match_arms.rs b/crates/ide-assists/src/handlers/add_missing_match_arms.rs
index 73f4db4e5f..8e4ac69ae6 100644
--- a/crates/ide-assists/src/handlers/add_missing_match_arms.rs
+++ b/crates/ide-assists/src/handlers/add_missing_match_arms.rs
@@ -326,7 +326,7 @@ impl ExtendedEnum {
 fn resolve_enum_def(sema: &Semantics<'_, RootDatabase>, expr: &ast::Expr) -> Option<ExtendedEnum> {
     sema.type_of_expr(expr)?.adjusted().autoderef(sema.db).find_map(|ty| match ty.as_adt() {
         Some(Adt::Enum(e)) => Some(ExtendedEnum::Enum(e)),
-        _ => ty.is_bool().then(|| ExtendedEnum::Bool),
+        _ => ty.is_bool().then_some(ExtendedEnum::Bool),
     })
 }
 
@@ -344,7 +344,7 @@ fn resolve_tuple_of_enum_def(
                 // For now we only handle expansion for a tuple of enums. Here
                 // we map non-enum items to None and rely on `collect` to
                 // convert Vec<Option<hir::Enum>> into Option<Vec<hir::Enum>>.
-                _ => ty.is_bool().then(|| ExtendedEnum::Bool),
+                _ => ty.is_bool().then_some(ExtendedEnum::Bool),
             })
         })
         .collect()
diff --git a/crates/ide-assists/src/handlers/add_return_type.rs b/crates/ide-assists/src/handlers/add_return_type.rs
index 89040a8569..879c478acf 100644
--- a/crates/ide-assists/src/handlers/add_return_type.rs
+++ b/crates/ide-assists/src/handlers/add_return_type.rs
@@ -35,16 +35,16 @@ pub(crate) fn add_return_type(acc: &mut Assists, ctx: &AssistContext<'_>) -> Opt
             match builder_edit_pos {
                 InsertOrReplace::Insert(insert_pos, needs_whitespace) => {
                     let preceeding_whitespace = if needs_whitespace { " " } else { "" };
-                    builder.insert(insert_pos, &format!("{preceeding_whitespace}-> {ty} "))
+                    builder.insert(insert_pos, format!("{preceeding_whitespace}-> {ty} "))
                 }
                 InsertOrReplace::Replace(text_range) => {
-                    builder.replace(text_range, &format!("-> {ty}"))
+                    builder.replace(text_range, format!("-> {ty}"))
                 }
             }
             if let FnType::Closure { wrap_expr: true } = fn_type {
                 cov_mark::hit!(wrap_closure_non_block_expr);
                 // `|x| x` becomes `|x| -> T x` which is invalid, so wrap it in a block
-                builder.replace(tail_expr.syntax().text_range(), &format!("{{{tail_expr}}}"));
+                builder.replace(tail_expr.syntax().text_range(), format!("{{{tail_expr}}}"));
             }
         },
     )
diff --git a/crates/ide-assists/src/handlers/auto_import.rs b/crates/ide-assists/src/handlers/auto_import.rs
index a689270bc0..698ad78cce 100644
--- a/crates/ide-assists/src/handlers/auto_import.rs
+++ b/crates/ide-assists/src/handlers/auto_import.rs
@@ -203,7 +203,7 @@ fn relevance_score(
         // get the distance between the imported path and the current module
         // (prefer items that are more local)
         Some((item_module, current_module)) => {
-            score -= module_distance_hueristic(db, &current_module, &item_module) as i32;
+            score -= module_distance_hueristic(db, current_module, &item_module) as i32;
         }
 
         // could not find relevant modules, so just use the length of the path as an estimate
diff --git a/crates/ide-assists/src/handlers/convert_iter_for_each_to_for.rs b/crates/ide-assists/src/handlers/convert_iter_for_each_to_for.rs
index 80eecf4a09..f32ef2d59d 100644
--- a/crates/ide-assists/src/handlers/convert_iter_for_each_to_for.rs
+++ b/crates/ide-assists/src/handlers/convert_iter_for_each_to_for.rs
@@ -216,7 +216,7 @@ fn validate_method_call_expr(
     let krate = module.krate();
 
     let iter_trait = FamousDefs(sema, krate).core_iter_Iterator()?;
-    it_type.impls_trait(sema.db, iter_trait, &[]).then(|| (expr, receiver))
+    it_type.impls_trait(sema.db, iter_trait, &[]).then_some((expr, receiver))
 }
 
 #[cfg(test)]
diff --git a/crates/ide-assists/src/handlers/convert_tuple_struct_to_named_struct.rs b/crates/ide-assists/src/handlers/convert_tuple_struct_to_named_struct.rs
index 92e091fca1..b0383291e7 100644
--- a/crates/ide-assists/src/handlers/convert_tuple_struct_to_named_struct.rs
+++ b/crates/ide-assists/src/handlers/convert_tuple_struct_to_named_struct.rs
@@ -168,7 +168,7 @@ fn edit_struct_references(
                     let arg_list = call_expr.syntax().descendants().find_map(ast::ArgList::cast)?;
 
                     edit.replace(
-                        call_expr.syntax().text_range(),
+                        ctx.sema.original_range(&node).range,
                         ast::make::record_expr(
                             path,
                             ast::make::record_expr_field_list(arg_list.args().zip(names).map(
@@ -249,6 +249,24 @@ mod tests {
         );
         check_assist_not_applicable(convert_tuple_struct_to_named_struct, r#"struct Foo$0;"#);
     }
+    #[test]
+    fn convert_in_macro_args() {
+        check_assist(
+            convert_tuple_struct_to_named_struct,
+            r#"
+macro_rules! foo {($i:expr) => {$i} }
+struct T$0(u8);
+fn test() {
+    foo!(T(1));
+}"#,
+            r#"
+macro_rules! foo {($i:expr) => {$i} }
+struct T { field1: u8 }
+fn test() {
+    foo!(T { field1: 1 });
+}"#,
+        );
+    }
 
     #[test]
     fn convert_simple_struct() {
@@ -554,6 +572,29 @@ where
         );
     }
 
+    #[test]
+    fn convert_variant_in_macro_args() {
+        check_assist(
+            convert_tuple_struct_to_named_struct,
+            r#"
+macro_rules! foo {($i:expr) => {$i} }
+enum T {
+  V$0(u8)
+}
+fn test() {
+    foo!(T::V(1));
+}"#,
+            r#"
+macro_rules! foo {($i:expr) => {$i} }
+enum T {
+  V { field1: u8 }
+}
+fn test() {
+    foo!(T::V { field1: 1 });
+}"#,
+        );
+    }
+
     #[test]
     fn convert_simple_variant() {
         check_assist(
diff --git a/crates/ide-assists/src/handlers/move_format_string_arg.rs b/crates/ide-assists/src/handlers/extract_expressions_from_format_string.rs
similarity index 84%
rename from crates/ide-assists/src/handlers/move_format_string_arg.rs
rename to crates/ide-assists/src/handlers/extract_expressions_from_format_string.rs
index 11db6ae7f7..4f3b6e0c28 100644
--- a/crates/ide-assists/src/handlers/move_format_string_arg.rs
+++ b/crates/ide-assists/src/handlers/extract_expressions_from_format_string.rs
@@ -10,7 +10,7 @@ use itertools::Itertools;
 use stdx::format_to;
 use syntax::{ast, AstNode, AstToken, NodeOrToken, SyntaxKind::COMMA, TextRange};
 
-// Assist: move_format_string_arg
+// Assist: extract_expressions_from_format_string
 //
 // Move an expression out of a format string.
 //
@@ -23,7 +23,7 @@ use syntax::{ast, AstNode, AstToken, NodeOrToken, SyntaxKind::COMMA, TextRange};
 // }
 //
 // fn main() {
-//     print!("{x + 1}$0");
+//     print!("{var} {x + 1}$0");
 // }
 // ```
 // ->
@@ -36,11 +36,14 @@ use syntax::{ast, AstNode, AstToken, NodeOrToken, SyntaxKind::COMMA, TextRange};
 // }
 //
 // fn main() {
-//     print!("{}"$0, x + 1);
+//     print!("{var} {}"$0, x + 1);
 // }
 // ```
 
-pub(crate) fn move_format_string_arg(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option<()> {
+pub(crate) fn extract_expressions_from_format_string(
+    acc: &mut Assists,
+    ctx: &AssistContext<'_>,
+) -> Option<()> {
     let fmt_string = ctx.find_token_at_offset::<ast::String>()?;
     let tt = fmt_string.syntax().parent().and_then(ast::TokenTree::cast)?;
 
@@ -58,7 +61,7 @@ pub(crate) fn move_format_string_arg(acc: &mut Assists, ctx: &AssistContext<'_>)
 
     acc.add(
         AssistId(
-            "move_format_string_arg",
+            "extract_expressions_from_format_string",
             // if there aren't any expressions, then make the assist a RefactorExtract
             if extracted_args.iter().filter(|f| matches!(f, Arg::Expr(_))).count() == 0 {
                 AssistKind::RefactorExtract
@@ -66,7 +69,7 @@ pub(crate) fn move_format_string_arg(acc: &mut Assists, ctx: &AssistContext<'_>)
                 AssistKind::QuickFix
             },
         ),
-        "Extract format args",
+        "Extract format expressions",
         tt.syntax().text_range(),
         |edit| {
             let fmt_range = fmt_string.syntax().text_range();
@@ -118,15 +121,14 @@ pub(crate) fn move_format_string_arg(acc: &mut Assists, ctx: &AssistContext<'_>)
             let mut placeholder_idx = 1;
 
             for extracted_args in extracted_args {
-                // remove expr from format string
-                args.push_str(", ");
-
                 match extracted_args {
-                    Arg::Ident(s) | Arg::Expr(s) => {
+                    Arg::Expr(s)=> {
+                        args.push_str(", ");
                         // insert arg
                         args.push_str(&s);
                     }
                     Arg::Placeholder => {
+                        args.push_str(", ");
                         // try matching with existing argument
                         match existing_args.next() {
                             Some(ea) => {
@@ -139,6 +141,7 @@ pub(crate) fn move_format_string_arg(acc: &mut Assists, ctx: &AssistContext<'_>)
                             }
                         }
                     }
+                    Arg::Ident(_s) => (),
                 }
             }
 
@@ -171,7 +174,7 @@ macro_rules! print {
     #[test]
     fn multiple_middle_arg() {
         check_assist(
-            move_format_string_arg,
+            extract_expressions_from_format_string,
             &add_macro_decl(
                 r#"
 fn main() {
@@ -192,7 +195,7 @@ fn main() {
     #[test]
     fn single_arg() {
         check_assist(
-            move_format_string_arg,
+            extract_expressions_from_format_string,
             &add_macro_decl(
                 r#"
 fn main() {
@@ -213,7 +216,7 @@ fn main() {
     #[test]
     fn multiple_middle_placeholders_arg() {
         check_assist(
-            move_format_string_arg,
+            extract_expressions_from_format_string,
             &add_macro_decl(
                 r#"
 fn main() {
@@ -234,7 +237,7 @@ fn main() {
     #[test]
     fn multiple_trailing_args() {
         check_assist(
-            move_format_string_arg,
+            extract_expressions_from_format_string,
             &add_macro_decl(
                 r#"
 fn main() {
@@ -255,7 +258,7 @@ fn main() {
     #[test]
     fn improper_commas() {
         check_assist(
-            move_format_string_arg,
+            extract_expressions_from_format_string,
             &add_macro_decl(
                 r#"
 fn main() {
@@ -276,7 +279,7 @@ fn main() {
     #[test]
     fn nested_tt() {
         check_assist(
-            move_format_string_arg,
+            extract_expressions_from_format_string,
             &add_macro_decl(
                 r#"
 fn main() {
@@ -289,6 +292,29 @@ fn main() {
 fn main() {
     print!("My name is {} {}"$0, stringify!(Paperino), x + x)
 }
+"#,
+            ),
+        );
+    }
+
+    #[test]
+    fn extract_only_expressions() {
+        check_assist(
+            extract_expressions_from_format_string,
+            &add_macro_decl(
+                r#"
+fn main() {
+    let var = 1 + 1;
+    print!("foobar {var} {var:?} {x$0 + x}")
+}
+"#,
+            ),
+            &add_macro_decl(
+                r#"
+fn main() {
+    let var = 1 + 1;
+    print!("foobar {var} {var:?} {}"$0, x + x)
+}
 "#,
             ),
         );
diff --git a/crates/ide-assists/src/handlers/extract_function.rs b/crates/ide-assists/src/handlers/extract_function.rs
index c1e2f19ab1..e04a1dabb2 100644
--- a/crates/ide-assists/src/handlers/extract_function.rs
+++ b/crates/ide-assists/src/handlers/extract_function.rs
@@ -11,7 +11,9 @@ use ide_db::{
     helpers::mod_path_to_ast,
     imports::insert_use::{insert_use, ImportScope},
     search::{FileReference, ReferenceCategory, SearchScope},
-    syntax_helpers::node_ext::{preorder_expr, walk_expr, walk_pat, walk_patterns_in_expr},
+    syntax_helpers::node_ext::{
+        for_each_tail_expr, preorder_expr, walk_expr, walk_pat, walk_patterns_in_expr,
+    },
     FxIndexSet, RootDatabase,
 };
 use itertools::Itertools;
@@ -78,7 +80,7 @@ pub(crate) fn extract_function(acc: &mut Assists, ctx: &AssistContext<'_>) -> Op
     };
 
     let body = extraction_target(&node, range)?;
-    let container_info = body.analyze_container(&ctx.sema)?;
+    let (container_info, contains_tail_expr) = body.analyze_container(&ctx.sema)?;
 
     let (locals_used, self_param) = body.analyze(&ctx.sema);
 
@@ -119,6 +121,7 @@ pub(crate) fn extract_function(acc: &mut Assists, ctx: &AssistContext<'_>) -> Op
                 ret_ty,
                 body,
                 outliving_locals,
+                contains_tail_expr,
                 mods: container_info,
             };
 
@@ -245,6 +248,8 @@ struct Function {
     ret_ty: RetType,
     body: FunctionBody,
     outliving_locals: Vec<OutlivedLocal>,
+    /// Whether at least one of the container's tail expr is contained in the range we're extracting.
+    contains_tail_expr: bool,
     mods: ContainerInfo,
 }
 
@@ -265,7 +270,7 @@ enum ParamKind {
     MutRef,
 }
 
-#[derive(Debug, Eq, PartialEq)]
+#[derive(Debug)]
 enum FunType {
     Unit,
     Single(hir::Type),
@@ -294,7 +299,6 @@ struct ControlFlow {
 #[derive(Clone, Debug)]
 struct ContainerInfo {
     is_const: bool,
-    is_in_tail: bool,
     parent_loop: Option<SyntaxNode>,
     /// The function's return type, const's type etc.
     ret_type: Option<hir::Type>,
@@ -584,7 +588,7 @@ impl FunctionBody {
             FunctionBody::Expr(expr) => Some(expr.clone()),
             FunctionBody::Span { parent, text_range } => {
                 let tail_expr = parent.tail_expr()?;
-                text_range.contains_range(tail_expr.syntax().text_range()).then(|| tail_expr)
+                text_range.contains_range(tail_expr.syntax().text_range()).then_some(tail_expr)
             }
         }
     }
@@ -743,7 +747,10 @@ impl FunctionBody {
         (res, self_param)
     }
 
-    fn analyze_container(&self, sema: &Semantics<'_, RootDatabase>) -> Option<ContainerInfo> {
+    fn analyze_container(
+        &self,
+        sema: &Semantics<'_, RootDatabase>,
+    ) -> Option<(ContainerInfo, bool)> {
         let mut ancestors = self.parent()?.ancestors();
         let infer_expr_opt = |expr| sema.type_of_expr(&expr?).map(TypeInfo::adjusted);
         let mut parent_loop = None;
@@ -815,28 +822,36 @@ impl FunctionBody {
                 }
             };
         };
-        let container_tail = match expr? {
-            ast::Expr::BlockExpr(block) => block.tail_expr(),
-            expr => Some(expr),
-        };
-        let is_in_tail =
-            container_tail.zip(self.tail_expr()).map_or(false, |(container_tail, body_tail)| {
-                container_tail.syntax().text_range().contains_range(body_tail.syntax().text_range())
+
+        let expr = expr?;
+        let contains_tail_expr = if let Some(body_tail) = self.tail_expr() {
+            let mut contains_tail_expr = false;
+            let tail_expr_range = body_tail.syntax().text_range();
+            for_each_tail_expr(&expr, &mut |e| {
+                if tail_expr_range.contains_range(e.syntax().text_range()) {
+                    contains_tail_expr = true;
+                }
             });
+            contains_tail_expr
+        } else {
+            false
+        };
 
         let parent = self.parent()?;
         let parents = generic_parents(&parent);
         let generic_param_lists = parents.iter().filter_map(|it| it.generic_param_list()).collect();
         let where_clauses = parents.iter().filter_map(|it| it.where_clause()).collect();
 
-        Some(ContainerInfo {
-            is_in_tail,
-            is_const,
-            parent_loop,
-            ret_type: ty,
-            generic_param_lists,
-            where_clauses,
-        })
+        Some((
+            ContainerInfo {
+                is_const,
+                parent_loop,
+                ret_type: ty,
+                generic_param_lists,
+                where_clauses,
+            },
+            contains_tail_expr,
+        ))
     }
 
     fn return_ty(&self, ctx: &AssistContext<'_>) -> Option<RetType> {
@@ -1368,7 +1383,7 @@ impl FlowHandler {
             None => FlowHandler::None,
             Some(flow_kind) => {
                 let action = flow_kind.clone();
-                if *ret_ty == FunType::Unit {
+                if let FunType::Unit = ret_ty {
                     match flow_kind {
                         FlowKind::Return(None)
                         | FlowKind::Break(_, None)
@@ -1633,7 +1648,7 @@ impl Function {
 
     fn make_ret_ty(&self, ctx: &AssistContext<'_>, module: hir::Module) -> Option<ast::RetType> {
         let fun_ty = self.return_type(ctx);
-        let handler = if self.mods.is_in_tail {
+        let handler = if self.contains_tail_expr {
             FlowHandler::None
         } else {
             FlowHandler::from_ret_ty(self, &fun_ty)
@@ -1707,7 +1722,7 @@ fn make_body(
     fun: &Function,
 ) -> ast::BlockExpr {
     let ret_ty = fun.return_type(ctx);
-    let handler = if fun.mods.is_in_tail {
+    let handler = if fun.contains_tail_expr {
         FlowHandler::None
     } else {
         FlowHandler::from_ret_ty(fun, &ret_ty)
@@ -1785,7 +1800,7 @@ fn make_body(
                 .collect::<Vec<SyntaxElement>>();
             let tail_expr = tail_expr.map(|expr| expr.dedent(old_indent).indent(body_indent));
 
-            make::hacky_block_expr_with_comments(elements, tail_expr)
+            make::hacky_block_expr(elements, tail_expr)
         }
     };
 
@@ -1845,9 +1860,29 @@ fn with_default_tail_expr(block: ast::BlockExpr, tail_expr: ast::Expr) -> ast::B
 }
 
 fn with_tail_expr(block: ast::BlockExpr, tail_expr: ast::Expr) -> ast::BlockExpr {
-    let stmt_tail = block.tail_expr().map(|expr| make::expr_stmt(expr).into());
-    let stmts = block.statements().chain(stmt_tail);
-    make::block_expr(stmts, Some(tail_expr))
+    let stmt_tail_opt: Option<ast::Stmt> =
+        block.tail_expr().map(|expr| make::expr_stmt(expr).into());
+
+    let mut elements: Vec<SyntaxElement> = vec![];
+
+    block.statements().for_each(|stmt| {
+        elements.push(syntax::NodeOrToken::Node(stmt.syntax().clone()));
+    });
+
+    if let Some(stmt_list) = block.stmt_list() {
+        stmt_list.syntax().children_with_tokens().for_each(|node_or_token| {
+            match &node_or_token {
+                syntax::NodeOrToken::Token(_) => elements.push(node_or_token),
+                _ => (),
+            };
+        });
+    }
+
+    if let Some(stmt_tail) = stmt_tail_opt {
+        elements.push(syntax::NodeOrToken::Node(stmt_tail.syntax().clone()));
+    }
+
+    make::hacky_block_expr(elements, Some(tail_expr))
 }
 
 fn format_type(ty: &hir::Type, ctx: &AssistContext<'_>, module: hir::Module) -> String {
@@ -1946,7 +1981,7 @@ fn update_external_control_flow(handler: &FlowHandler, syntax: &SyntaxNode) {
                 if nested_scope.is_none() {
                     if let Some(expr) = ast::Expr::cast(e.clone()) {
                         match expr {
-                            ast::Expr::ReturnExpr(return_expr) if nested_scope.is_none() => {
+                            ast::Expr::ReturnExpr(return_expr) => {
                                 let expr = return_expr.expr();
                                 if let Some(replacement) = make_rewritten_flow(handler, expr) {
                                     ted::replace(return_expr.syntax(), replacement.syntax())
@@ -4944,9 +4979,8 @@ fn $0fun_name() {
         );
     }
 
-    // FIXME: we do want to preserve whitespace
     #[test]
-    fn extract_function_does_not_preserve_whitespace() {
+    fn extract_function_does_preserve_whitespace() {
         check_assist(
             extract_function,
             r#"
@@ -4965,6 +4999,7 @@ fn func() {
 
 fn $0fun_name() {
     let a = 0;
+
     let x = 0;
 }
 "#,
@@ -5582,6 +5617,193 @@ impl <T, U> Struct<T, U> where T: Into<i32> + Copy, U: Debug {
 fn $0fun_name<T, V>(t: T, v: V) -> i32 where T: Into<i32> + Copy, V: Into<i32> {
     t.into() + v.into()
 }
+"#,
+        );
+    }
+
+    #[test]
+    fn non_tail_expr_of_tail_expr_loop() {
+        check_assist(
+            extract_function,
+            r#"
+pub fn f() {
+    loop {
+        $0if true {
+            continue;
+        }$0
+
+        if false {
+            break;
+        }
+    }
+}
+"#,
+            r#"
+pub fn f() {
+    loop {
+        if let ControlFlow::Break(_) = fun_name() {
+            continue;
+        }
+
+        if false {
+            break;
+        }
+    }
+}
+
+fn $0fun_name() -> ControlFlow<()> {
+    if true {
+        return ControlFlow::Break(());
+    }
+    ControlFlow::Continue(())
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn non_tail_expr_of_tail_if_block() {
+        // FIXME: double semicolon
+        check_assist(
+            extract_function,
+            r#"
+//- minicore: option, try
+impl<T> core::ops::Try for Option<T> {
+    type Output = T;
+    type Residual = Option<!>;
+}
+impl<T> core::ops::FromResidual for Option<T> {}
+
+fn f() -> Option<()> {
+    if true {
+        let a = $0if true {
+            Some(())?
+        } else {
+            ()
+        }$0;
+        Some(a)
+    } else {
+        None
+    }
+}
+"#,
+            r#"
+impl<T> core::ops::Try for Option<T> {
+    type Output = T;
+    type Residual = Option<!>;
+}
+impl<T> core::ops::FromResidual for Option<T> {}
+
+fn f() -> Option<()> {
+    if true {
+        let a = fun_name()?;;
+        Some(a)
+    } else {
+        None
+    }
+}
+
+fn $0fun_name() -> Option<()> {
+    Some(if true {
+        Some(())?
+    } else {
+        ()
+    })
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn tail_expr_of_tail_block_nested() {
+        check_assist(
+            extract_function,
+            r#"
+//- minicore: option, try
+impl<T> core::ops::Try for Option<T> {
+    type Output = T;
+    type Residual = Option<!>;
+}
+impl<T> core::ops::FromResidual for Option<T> {}
+
+fn f() -> Option<()> {
+    if true {
+        $0{
+            let a = if true {
+                Some(())?
+            } else {
+                ()
+            };
+            Some(a)
+        }$0
+    } else {
+        None
+    }
+}
+"#,
+            r#"
+impl<T> core::ops::Try for Option<T> {
+    type Output = T;
+    type Residual = Option<!>;
+}
+impl<T> core::ops::FromResidual for Option<T> {}
+
+fn f() -> Option<()> {
+    if true {
+        fun_name()?
+    } else {
+        None
+    }
+}
+
+fn $0fun_name() -> Option<()> {
+    let a = if true {
+        Some(())?
+    } else {
+        ()
+    };
+    Some(a)
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn non_tail_expr_with_comment_of_tail_expr_loop() {
+        check_assist(
+            extract_function,
+            r#"
+pub fn f() {
+    loop {
+        $0// A comment
+        if true {
+            continue;
+        }$0
+        if false {
+            break;
+        }
+    }
+}
+"#,
+            r#"
+pub fn f() {
+    loop {
+        if let ControlFlow::Break(_) = fun_name() {
+            continue;
+        }
+        if false {
+            break;
+        }
+    }
+}
+
+fn $0fun_name() -> ControlFlow<()> {
+    // A comment
+    if true {
+        return ControlFlow::Break(());
+    }
+    ControlFlow::Continue(())
+}
 "#,
         );
     }
diff --git a/crates/ide-assists/src/handlers/extract_module.rs b/crates/ide-assists/src/handlers/extract_module.rs
index 56834394ae..0fa7bd558b 100644
--- a/crates/ide-assists/src/handlers/extract_module.rs
+++ b/crates/ide-assists/src/handlers/extract_module.rs
@@ -10,6 +10,8 @@ use ide_db::{
     defs::{Definition, NameClass, NameRefClass},
     search::{FileReference, SearchScope},
 };
+use itertools::Itertools;
+use smallvec::SmallVec;
 use stdx::format_to;
 use syntax::{
     algo::find_node_at_range,
@@ -116,13 +118,13 @@ pub(crate) fn extract_module(acc: &mut Assists, ctx: &AssistContext<'_>) -> Opti
 
             let mut body_items: Vec<String> = Vec::new();
             let mut items_to_be_processed: Vec<ast::Item> = module.body_items.clone();
-            let mut new_item_indent = old_item_indent + 1;
 
-            if impl_parent.is_some() {
-                new_item_indent = old_item_indent + 2;
+            let new_item_indent = if impl_parent.is_some() {
+                old_item_indent + 2
             } else {
                 items_to_be_processed = [module.use_items.clone(), items_to_be_processed].concat();
-            }
+                old_item_indent + 1
+            };
 
             for item in items_to_be_processed {
                 let item = item.indent(IndentLevel(1));
@@ -657,28 +659,23 @@ impl Module {
 
 fn check_intersection_and_push(
     import_paths_to_be_removed: &mut Vec<TextRange>,
-    import_path: TextRange,
+    mut import_path: TextRange,
 ) {
-    if import_paths_to_be_removed.len() > 0 {
-        // Text ranges received here for imports are extended to the
-        // next/previous comma which can cause intersections among them
-        // and later deletion of these can cause panics similar
-        // to reported in #11766. So to mitigate it, we
-        // check for intersection between all current members
-        // and if it exists we combine both text ranges into
-        // one
-        let r = import_paths_to_be_removed
-            .into_iter()
-            .position(|it| it.intersect(import_path).is_some());
-        match r {
-            Some(it) => {
-                import_paths_to_be_removed[it] = import_paths_to_be_removed[it].cover(import_path)
-            }
-            None => import_paths_to_be_removed.push(import_path),
-        }
-    } else {
-        import_paths_to_be_removed.push(import_path);
+    // Text ranges received here for imports are extended to the
+    // next/previous comma which can cause intersections among them
+    // and later deletion of these can cause panics similar
+    // to reported in #11766. So to mitigate it, we
+    // check for intersection between all current members
+    // and combine all such ranges into one.
+    let s: SmallVec<[_; 2]> = import_paths_to_be_removed
+        .into_iter()
+        .positions(|it| it.intersect(import_path).is_some())
+        .collect();
+    for pos in s.into_iter().rev() {
+        let intersecting_path = import_paths_to_be_removed.swap_remove(pos);
+        import_path = import_path.cover(intersecting_path);
     }
+    import_paths_to_be_removed.push(import_path);
 }
 
 fn does_source_exists_outside_sel_in_same_mod(
@@ -1766,4 +1763,49 @@ mod modname {
         ",
         )
     }
+
+    #[test]
+    fn test_merge_multiple_intersections() {
+        check_assist(
+            extract_module,
+            r#"
+mod dep {
+    pub struct A;
+    pub struct B;
+    pub struct C;
+}
+
+use dep::{A, B, C};
+
+$0struct S {
+    inner: A,
+    state: C,
+    condvar: B,
+}$0
+"#,
+            r#"
+mod dep {
+    pub struct A;
+    pub struct B;
+    pub struct C;
+}
+
+use dep::{};
+
+mod modname {
+    use super::dep::B;
+
+    use super::dep::C;
+
+    use super::dep::A;
+
+    pub(crate) struct S {
+        pub(crate) inner: A,
+        pub(crate) state: C,
+        pub(crate) condvar: B,
+    }
+}
+"#,
+        );
+    }
 }
diff --git a/crates/ide-assists/src/handlers/extract_struct_from_enum_variant.rs b/crates/ide-assists/src/handlers/extract_struct_from_enum_variant.rs
index b4e10667b0..49debafe1a 100644
--- a/crates/ide-assists/src/handlers/extract_struct_from_enum_variant.rs
+++ b/crates/ide-assists/src/handlers/extract_struct_from_enum_variant.rs
@@ -178,7 +178,7 @@ fn extract_generic_params(
             .fold(false, |tagged, ty| tag_generics_in_variant(&ty, &mut generics) || tagged),
     };
 
-    let generics = generics.into_iter().filter_map(|(param, tag)| tag.then(|| param));
+    let generics = generics.into_iter().filter_map(|(param, tag)| tag.then_some(param));
     tagged_one.then(|| make::generic_param_list(generics))
 }
 
diff --git a/crates/ide-assists/src/handlers/extract_type_alias.rs b/crates/ide-assists/src/handlers/extract_type_alias.rs
index 3116935fc5..0505f5784f 100644
--- a/crates/ide-assists/src/handlers/extract_type_alias.rs
+++ b/crates/ide-assists/src/handlers/extract_type_alias.rs
@@ -108,76 +108,80 @@ fn collect_used_generics<'gp>(
     }
 
     let mut generics = Vec::new();
-    walk_ty(ty, &mut |ty| match ty {
-        ast::Type::PathType(ty) => {
-            if let Some(path) = ty.path() {
-                if let Some(name_ref) = path.as_single_name_ref() {
-                    if let Some(param) = known_generics.iter().find(|gp| {
-                        match gp {
-                            ast::GenericParam::ConstParam(cp) => cp.name(),
-                            ast::GenericParam::TypeParam(tp) => tp.name(),
-                            _ => None,
-                        }
-                        .map_or(false, |n| n.text() == name_ref.text())
-                    }) {
-                        generics.push(param);
-                    }
-                }
-                generics.extend(
-                    path.segments()
-                        .filter_map(|seg| seg.generic_arg_list())
-                        .flat_map(|it| it.generic_args())
-                        .filter_map(|it| match it {
-                            ast::GenericArg::LifetimeArg(lt) => {
-                                let lt = lt.lifetime()?;
-                                known_generics.iter().find(find_lifetime(&lt.text()))
+    walk_ty(ty, &mut |ty| {
+        match ty {
+            ast::Type::PathType(ty) => {
+                if let Some(path) = ty.path() {
+                    if let Some(name_ref) = path.as_single_name_ref() {
+                        if let Some(param) = known_generics.iter().find(|gp| {
+                            match gp {
+                                ast::GenericParam::ConstParam(cp) => cp.name(),
+                                ast::GenericParam::TypeParam(tp) => tp.name(),
+                                _ => None,
                             }
-                            _ => None,
-                        }),
-                );
-            }
-        }
-        ast::Type::ImplTraitType(impl_ty) => {
-            if let Some(it) = impl_ty.type_bound_list() {
-                generics.extend(
-                    it.bounds()
-                        .filter_map(|it| it.lifetime())
-                        .filter_map(|lt| known_generics.iter().find(find_lifetime(&lt.text()))),
-                );
-            }
-        }
-        ast::Type::DynTraitType(dyn_ty) => {
-            if let Some(it) = dyn_ty.type_bound_list() {
-                generics.extend(
-                    it.bounds()
-                        .filter_map(|it| it.lifetime())
-                        .filter_map(|lt| known_generics.iter().find(find_lifetime(&lt.text()))),
-                );
-            }
-        }
-        ast::Type::RefType(ref_) => generics.extend(
-            ref_.lifetime().and_then(|lt| known_generics.iter().find(find_lifetime(&lt.text()))),
-        ),
-        ast::Type::ArrayType(ar) => {
-            if let Some(expr) = ar.expr() {
-                if let ast::Expr::PathExpr(p) = expr {
-                    if let Some(path) = p.path() {
-                        if let Some(name_ref) = path.as_single_name_ref() {
-                            if let Some(param) = known_generics.iter().find(|gp| {
-                                if let ast::GenericParam::ConstParam(cp) = gp {
-                                    cp.name().map_or(false, |n| n.text() == name_ref.text())
-                                } else {
-                                    false
+                            .map_or(false, |n| n.text() == name_ref.text())
+                        }) {
+                            generics.push(param);
+                        }
+                    }
+                    generics.extend(
+                        path.segments()
+                            .filter_map(|seg| seg.generic_arg_list())
+                            .flat_map(|it| it.generic_args())
+                            .filter_map(|it| match it {
+                                ast::GenericArg::LifetimeArg(lt) => {
+                                    let lt = lt.lifetime()?;
+                                    known_generics.iter().find(find_lifetime(&lt.text()))
+                                }
+                                _ => None,
+                            }),
+                    );
+                }
+            }
+            ast::Type::ImplTraitType(impl_ty) => {
+                if let Some(it) = impl_ty.type_bound_list() {
+                    generics.extend(
+                        it.bounds()
+                            .filter_map(|it| it.lifetime())
+                            .filter_map(|lt| known_generics.iter().find(find_lifetime(&lt.text()))),
+                    );
+                }
+            }
+            ast::Type::DynTraitType(dyn_ty) => {
+                if let Some(it) = dyn_ty.type_bound_list() {
+                    generics.extend(
+                        it.bounds()
+                            .filter_map(|it| it.lifetime())
+                            .filter_map(|lt| known_generics.iter().find(find_lifetime(&lt.text()))),
+                    );
+                }
+            }
+            ast::Type::RefType(ref_) => generics.extend(
+                ref_.lifetime()
+                    .and_then(|lt| known_generics.iter().find(find_lifetime(&lt.text()))),
+            ),
+            ast::Type::ArrayType(ar) => {
+                if let Some(expr) = ar.expr() {
+                    if let ast::Expr::PathExpr(p) = expr {
+                        if let Some(path) = p.path() {
+                            if let Some(name_ref) = path.as_single_name_ref() {
+                                if let Some(param) = known_generics.iter().find(|gp| {
+                                    if let ast::GenericParam::ConstParam(cp) = gp {
+                                        cp.name().map_or(false, |n| n.text() == name_ref.text())
+                                    } else {
+                                        false
+                                    }
+                                }) {
+                                    generics.push(param);
                                 }
-                            }) {
-                                generics.push(param);
                             }
                         }
                     }
                 }
             }
-        }
-        _ => (),
+            _ => (),
+        };
+        false
     });
     // stable resort to lifetime, type, const
     generics.sort_by_key(|gp| match gp {
diff --git a/crates/ide-assists/src/handlers/generate_default_from_new.rs b/crates/ide-assists/src/handlers/generate_default_from_new.rs
index 49d9fd707f..2d074a33e7 100644
--- a/crates/ide-assists/src/handlers/generate_default_from_new.rs
+++ b/crates/ide-assists/src/handlers/generate_default_from_new.rs
@@ -53,7 +53,7 @@ pub(crate) fn generate_default_from_new(acc: &mut Assists, ctx: &AssistContext<'
         return None;
     }
 
-    let impl_ = fn_node.syntax().ancestors().into_iter().find_map(ast::Impl::cast)?;
+    let impl_ = fn_node.syntax().ancestors().find_map(ast::Impl::cast)?;
     if is_default_implemented(ctx, &impl_) {
         cov_mark::hit!(default_block_is_already_present);
         cov_mark::hit!(struct_in_module_with_default);
diff --git a/crates/ide-assists/src/handlers/generate_delegate_methods.rs b/crates/ide-assists/src/handlers/generate_delegate_methods.rs
index ceae807550..c8d0493d09 100644
--- a/crates/ide-assists/src/handlers/generate_delegate_methods.rs
+++ b/crates/ide-assists/src/handlers/generate_delegate_methods.rs
@@ -81,7 +81,7 @@ pub(crate) fn generate_delegate_methods(acc: &mut Assists, ctx: &AssistContext<'
         acc.add_group(
             &GroupLabel("Generate delegate methods…".to_owned()),
             AssistId("generate_delegate_methods", AssistKind::Generate),
-            format!("Generate delegate for `{}.{}()`", field_name, method.name(ctx.db())),
+            format!("Generate delegate for `{field_name}.{}()`", method.name(ctx.db())),
             target,
             |builder| {
                 // Create the function
@@ -104,9 +104,11 @@ pub(crate) fn generate_delegate_methods(acc: &mut Assists, ctx: &AssistContext<'
                     make::name_ref(&method_name.to_string()),
                     arg_list,
                 );
-                let body = make::block_expr([], Some(tail_expr));
                 let ret_type = method_source.ret_type();
                 let is_async = method_source.async_token().is_some();
+                let tail_expr_finished =
+                    if is_async { make::expr_await(tail_expr) } else { tail_expr };
+                let body = make::block_expr([], Some(tail_expr_finished));
                 let f = make::fn_(vis, name, type_params, params, body, ret_type, is_async)
                     .indent(ast::edit::IndentLevel(1))
                     .clone_for_update();
@@ -306,7 +308,7 @@ struct Person<T> {
 
 impl<T> Person<T> {
     $0pub(crate) async fn age<J, 'a>(&'a mut self, ty: T, arg: J) -> T {
-        self.age.age(ty, arg)
+        self.age.age(ty, arg).await
     }
 }"#,
         );
diff --git a/crates/ide-assists/src/handlers/generate_deref.rs b/crates/ide-assists/src/handlers/generate_deref.rs
index 55b7afb3d3..b6958e2919 100644
--- a/crates/ide-assists/src/handlers/generate_deref.rs
+++ b/crates/ide-assists/src/handlers/generate_deref.rs
@@ -85,8 +85,7 @@ fn generate_tuple_deref(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option<()
     let strukt = ctx.find_node_at_offset::<ast::Struct>()?;
     let field = ctx.find_node_at_offset::<ast::TupleField>()?;
     let field_list = ctx.find_node_at_offset::<ast::TupleFieldList>()?;
-    let field_list_index =
-        field_list.syntax().children().into_iter().position(|s| &s == field.syntax())?;
+    let field_list_index = field_list.syntax().children().position(|s| &s == field.syntax())?;
 
     let deref_type_to_generate = match existing_deref_impl(&ctx.sema, &strukt) {
         None => DerefType::Deref,
diff --git a/crates/ide-assists/src/handlers/generate_enum_projection_method.rs b/crates/ide-assists/src/handlers/generate_enum_projection_method.rs
index c9aa41c845..ee643ce9a4 100644
--- a/crates/ide-assists/src/handlers/generate_enum_projection_method.rs
+++ b/crates/ide-assists/src/handlers/generate_enum_projection_method.rs
@@ -157,7 +157,7 @@ fn generate_enum_projection_method(
         assist_description,
         target,
         |builder| {
-            let vis = parent_enum.visibility().map_or(String::new(), |v| format!("{} ", v));
+            let vis = parent_enum.visibility().map_or(String::new(), |v| format!("{v} "));
 
             let field_type_syntax = field_type.syntax();
 
diff --git a/crates/ide-assists/src/handlers/generate_enum_variant.rs b/crates/ide-assists/src/handlers/generate_enum_variant.rs
index 0bcb572831..cd037f7492 100644
--- a/crates/ide-assists/src/handlers/generate_enum_variant.rs
+++ b/crates/ide-assists/src/handlers/generate_enum_variant.rs
@@ -180,7 +180,7 @@ fn make_tuple_field_list(
 ) -> Option<ast::FieldList> {
     let args = call_expr.arg_list()?.args();
     let tuple_fields = args.map(|arg| {
-        let ty = expr_ty(ctx, arg, &scope).unwrap_or_else(make::ty_placeholder);
+        let ty = expr_ty(ctx, arg, scope).unwrap_or_else(make::ty_placeholder);
         make::tuple_field(None, ty)
     });
     Some(make::tuple_field_list(tuple_fields).into())
diff --git a/crates/ide-assists/src/handlers/generate_from_impl_for_enum.rs b/crates/ide-assists/src/handlers/generate_from_impl_for_enum.rs
index 7c81d2c6a6..742f1f78c2 100644
--- a/crates/ide-assists/src/handlers/generate_from_impl_for_enum.rs
+++ b/crates/ide-assists/src/handlers/generate_from_impl_for_enum.rs
@@ -1,7 +1,9 @@
 use ide_db::{famous_defs::FamousDefs, RootDatabase};
 use syntax::ast::{self, AstNode, HasName};
 
-use crate::{utils::generate_trait_impl_text, AssistContext, AssistId, AssistKind, Assists};
+use crate::{
+    utils::generate_trait_impl_text_intransitive, AssistContext, AssistId, AssistKind, Assists,
+};
 
 // Assist: generate_from_impl_for_enum
 //
@@ -70,7 +72,7 @@ pub(crate) fn generate_from_impl_for_enum(
     }}"#
                 )
             };
-            let from_impl = generate_trait_impl_text(&enum_, &from_trait, &impl_code);
+            let from_impl = generate_trait_impl_text_intransitive(&enum_, &from_trait, &impl_code);
             edit.insert(start_offset, from_impl);
         },
     )
diff --git a/crates/ide-assists/src/handlers/generate_function.rs b/crates/ide-assists/src/handlers/generate_function.rs
index 57f198748c..da9b0cda5b 100644
--- a/crates/ide-assists/src/handlers/generate_function.rs
+++ b/crates/ide-assists/src/handlers/generate_function.rs
@@ -514,7 +514,7 @@ fn fn_args(
 ///     vec!["foo_1".into(), "foo_2".into(), "bar_1".into(), "baz".into(), "bar_2".into()];
 /// assert_eq!(names, expected);
 /// ```
-fn deduplicate_arg_names(arg_names: &mut Vec<String>) {
+fn deduplicate_arg_names(arg_names: &mut [String]) {
     let mut arg_name_counts = FxHashMap::default();
     for name in arg_names.iter() {
         *arg_name_counts.entry(name).or_insert(0) += 1;
diff --git a/crates/ide-assists/src/handlers/generate_getter.rs b/crates/ide-assists/src/handlers/generate_getter.rs
index 5e71914283..15641b448d 100644
--- a/crates/ide-assists/src/handlers/generate_getter.rs
+++ b/crates/ide-assists/src/handlers/generate_getter.rs
@@ -176,7 +176,7 @@ pub(crate) fn generate_getter_impl(
                 // for separating it from other assoc items, that needs
                 // to be handled spearately
                 let mut getter_buf =
-                    generate_getter_from_info(ctx, &getter_info, &record_field_info);
+                    generate_getter_from_info(ctx, &getter_info, record_field_info);
 
                 // Insert `$0` only for last getter we generate
                 if i == record_fields_count - 1 {
@@ -235,7 +235,7 @@ fn generate_getter_from_info(
 ) -> String {
     let mut buf = String::with_capacity(512);
 
-    let vis = info.strukt.visibility().map_or(String::new(), |v| format!("{} ", v));
+    let vis = info.strukt.visibility().map_or(String::new(), |v| format!("{v} "));
     let (ty, body) = if info.mutable {
         (
             format!("&mut {}", record_field_info.field_ty),
@@ -271,7 +271,7 @@ fn generate_getter_from_info(
     }}",
         vis,
         record_field_info.fn_name,
-        info.mutable.then(|| "mut ").unwrap_or_default(),
+        info.mutable.then_some("mut ").unwrap_or_default(),
         ty,
         body,
     );
diff --git a/crates/ide-assists/src/handlers/generate_impl.rs b/crates/ide-assists/src/handlers/generate_impl.rs
index 9af26c04eb..9ad14a819d 100644
--- a/crates/ide-assists/src/handlers/generate_impl.rs
+++ b/crates/ide-assists/src/handlers/generate_impl.rs
@@ -1,14 +1,17 @@
 use syntax::ast::{self, AstNode, HasName};
 
-use crate::{utils::generate_impl_text, AssistContext, AssistId, AssistKind, Assists};
+use crate::{
+    utils::{generate_impl_text, generate_trait_impl_text_intransitive},
+    AssistContext, AssistId, AssistKind, Assists,
+};
 
 // Assist: generate_impl
 //
 // Adds a new inherent impl for a type.
 //
 // ```
-// struct Ctx<T: Clone> {
-//     data: T,$0
+// struct Ctx$0<T: Clone> {
+//     data: T,
 // }
 // ```
 // ->
@@ -26,6 +29,10 @@ pub(crate) fn generate_impl(acc: &mut Assists, ctx: &AssistContext<'_>) -> Optio
     let name = nominal.name()?;
     let target = nominal.syntax().text_range();
 
+    if let Some(_) = ctx.find_node_at_offset::<ast::RecordFieldList>() {
+        return None;
+    }
+
     acc.add(
         AssistId("generate_impl", AssistKind::Generate),
         format!("Generate impl for `{name}`"),
@@ -46,130 +53,211 @@ pub(crate) fn generate_impl(acc: &mut Assists, ctx: &AssistContext<'_>) -> Optio
     )
 }
 
+// Assist: generate_trait_impl
+//
+// Adds a new trait impl for a type.
+//
+// ```
+// struct $0Ctx<T: Clone> {
+//     data: T,
+// }
+// ```
+// ->
+// ```
+// struct Ctx<T: Clone> {
+//     data: T,
+// }
+//
+// impl<T: Clone> $0 for Ctx<T> {
+//
+// }
+// ```
+pub(crate) fn generate_trait_impl(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option<()> {
+    let nominal = ctx.find_node_at_offset::<ast::Adt>()?;
+    let name = nominal.name()?;
+    let target = nominal.syntax().text_range();
+
+    if let Some(_) = ctx.find_node_at_offset::<ast::RecordFieldList>() {
+        return None;
+    }
+
+    acc.add(
+        AssistId("generate_trait_impl", AssistKind::Generate),
+        format!("Generate trait impl for `{name}`"),
+        target,
+        |edit| {
+            let start_offset = nominal.syntax().text_range().end();
+            match ctx.config.snippet_cap {
+                Some(cap) => {
+                    let snippet = generate_trait_impl_text_intransitive(&nominal, "$0", "");
+                    edit.insert_snippet(cap, start_offset, snippet);
+                }
+                None => {
+                    let text = generate_trait_impl_text_intransitive(&nominal, "", "");
+                    edit.insert(start_offset, text);
+                }
+            }
+        },
+    )
+}
+
 #[cfg(test)]
 mod tests {
     use crate::tests::{check_assist, check_assist_target};
 
     use super::*;
 
-    // FIXME: break up into separate test fns
     #[test]
     fn test_add_impl() {
         check_assist(
             generate_impl,
-            "struct Foo {$0}\n",
-            "struct Foo {}\n\nimpl Foo {\n    $0\n}\n",
-        );
-        check_assist(
-            generate_impl,
-            "struct Foo<T: Clone> {$0}",
-            "struct Foo<T: Clone> {}\n\nimpl<T: Clone> Foo<T> {\n    $0\n}",
-        );
-        check_assist(
-            generate_impl,
-            "struct Foo<'a, T: Foo<'a>> {$0}",
-            "struct Foo<'a, T: Foo<'a>> {}\n\nimpl<'a, T: Foo<'a>> Foo<'a, T> {\n    $0\n}",
+            r#"
+                struct Foo$0 {}
+            "#,
+            r#"
+                struct Foo {}
+
+                impl Foo {
+                    $0
+                }
+            "#,
         );
+    }
+
+    #[test]
+    fn test_add_impl_with_generics() {
         check_assist(
             generate_impl,
             r#"
-            struct MyOwnArray<T, const S: usize> {}$0"#,
+                struct Foo$0<T: Clone> {}
+            "#,
             r#"
-            struct MyOwnArray<T, const S: usize> {}
+                struct Foo<T: Clone> {}
 
-            impl<T, const S: usize> MyOwnArray<T, S> {
-                $0
-            }"#,
+                impl<T: Clone> Foo<T> {
+                    $0
+                }
+            "#,
         );
+    }
+
+    #[test]
+    fn test_add_impl_with_generics_and_lifetime_parameters() {
         check_assist(
             generate_impl,
             r#"
-            #[cfg(feature = "foo")]
-            struct Foo<'a, T: Foo<'a>> {$0}"#,
+                struct Foo<'a, T: Foo<'a>>$0 {}
+            "#,
             r#"
-            #[cfg(feature = "foo")]
-            struct Foo<'a, T: Foo<'a>> {}
+                struct Foo<'a, T: Foo<'a>> {}
 
-            #[cfg(feature = "foo")]
-            impl<'a, T: Foo<'a>> Foo<'a, T> {
-                $0
-            }"#,
+                impl<'a, T: Foo<'a>> Foo<'a, T> {
+                    $0
+                }
+            "#,
         );
+    }
 
+    #[test]
+    fn test_add_impl_with_attributes() {
         check_assist(
             generate_impl,
             r#"
-            #[cfg(not(feature = "foo"))]
-            struct Foo<'a, T: Foo<'a>> {$0}"#,
+                #[cfg(feature = "foo")]
+                struct Foo<'a, T: Foo$0<'a>> {}
+            "#,
             r#"
-            #[cfg(not(feature = "foo"))]
-            struct Foo<'a, T: Foo<'a>> {}
+                #[cfg(feature = "foo")]
+                struct Foo<'a, T: Foo<'a>> {}
 
-            #[cfg(not(feature = "foo"))]
-            impl<'a, T: Foo<'a>> Foo<'a, T> {
-                $0
-            }"#,
+                #[cfg(feature = "foo")]
+                impl<'a, T: Foo<'a>> Foo<'a, T> {
+                    $0
+                }
+            "#,
         );
+    }
 
+    #[test]
+    fn test_add_impl_with_default_generic() {
         check_assist(
             generate_impl,
             r#"
-            struct Defaulted<T = i32> {}$0"#,
+                struct Defaulted$0<T = i32> {}
+            "#,
             r#"
-            struct Defaulted<T = i32> {}
+                struct Defaulted<T = i32> {}
 
-            impl<T> Defaulted<T> {
-                $0
-            }"#,
+                impl<T> Defaulted<T> {
+                    $0
+                }
+            "#,
         );
+    }
 
+    #[test]
+    fn test_add_impl_with_constrained_default_generic() {
         check_assist(
             generate_impl,
             r#"
-            struct Defaulted<'a, 'b: 'a, T: Debug + Clone + 'a + 'b = String, const S: usize> {}$0"#,
+                struct Defaulted$0<'a, 'b: 'a, T: Debug + Clone + 'a + 'b = String, const S: usize> {}
+            "#,
             r#"
-            struct Defaulted<'a, 'b: 'a, T: Debug + Clone + 'a + 'b = String, const S: usize> {}
+                struct Defaulted<'a, 'b: 'a, T: Debug + Clone + 'a + 'b = String, const S: usize> {}
 
-            impl<'a, 'b: 'a, T: Debug + Clone + 'a + 'b, const S: usize> Defaulted<'a, 'b, T, S> {
-                $0
-            }"#,
+                impl<'a, 'b: 'a, T: Debug + Clone + 'a + 'b, const S: usize> Defaulted<'a, 'b, T, S> {
+                    $0
+                }
+            "#,
         );
+    }
 
+    #[test]
+    fn test_add_impl_with_const_defaulted_generic() {
         check_assist(
             generate_impl,
             r#"
-            struct Defaulted<const N: i32 = 0> {}$0"#,
+                struct Defaulted$0<const N: i32 = 0> {}
+            "#,
             r#"
-            struct Defaulted<const N: i32 = 0> {}
+                struct Defaulted<const N: i32 = 0> {}
 
-            impl<const N: i32> Defaulted<N> {
-                $0
-            }"#,
+                impl<const N: i32> Defaulted<N> {
+                    $0
+                }
+            "#,
         );
+    }
 
+    #[test]
+    fn test_add_impl_with_trait_constraint() {
         check_assist(
             generate_impl,
-            r#"pub trait Trait {}
-struct Struct<T>$0
-where
-    T: Trait,
-{
-    inner: T,
-}"#,
-            r#"pub trait Trait {}
-struct Struct<T>
-where
-    T: Trait,
-{
-    inner: T,
-}
+            r#"
+                pub trait Trait {}
+                struct Struct$0<T>
+                where
+                    T: Trait,
+                {
+                    inner: T,
+                }
+            "#,
+            r#"
+                pub trait Trait {}
+                struct Struct<T>
+                where
+                    T: Trait,
+                {
+                    inner: T,
+                }
 
-impl<T> Struct<T>
-where
-    T: Trait,
-{
-    $0
-}"#,
+                impl<T> Struct<T>
+                where
+                    T: Trait,
+                {
+                    $0
+                }
+            "#,
         );
     }
 
@@ -177,14 +265,181 @@ where
     fn add_impl_target() {
         check_assist_target(
             generate_impl,
-            "
-struct SomeThingIrrelevant;
-/// Has a lifetime parameter
-struct Foo<'a, T: Foo<'a>> {$0}
-struct EvenMoreIrrelevant;
-",
-            "/// Has a lifetime parameter
-struct Foo<'a, T: Foo<'a>> {}",
+            r#"
+                struct SomeThingIrrelevant;
+                /// Has a lifetime parameter
+                struct Foo$0<'a, T: Foo<'a>> {}
+                struct EvenMoreIrrelevant;
+            "#,
+            "/// Has a lifetime parameter\nstruct Foo<'a, T: Foo<'a>> {}",
+        );
+    }
+
+    #[test]
+    fn test_add_trait_impl() {
+        check_assist(
+            generate_trait_impl,
+            r#"
+                struct Foo$0 {}
+            "#,
+            r#"
+                struct Foo {}
+
+                impl $0 for Foo {
+
+                }
+            "#,
+        );
+    }
+
+    #[test]
+    fn test_add_trait_impl_with_generics() {
+        check_assist(
+            generate_trait_impl,
+            r#"
+                struct Foo$0<T: Clone> {}
+            "#,
+            r#"
+                struct Foo<T: Clone> {}
+
+                impl<T: Clone> $0 for Foo<T> {
+
+                }
+            "#,
+        );
+    }
+
+    #[test]
+    fn test_add_trait_impl_with_generics_and_lifetime_parameters() {
+        check_assist(
+            generate_trait_impl,
+            r#"
+                struct Foo<'a, T: Foo<'a>>$0 {}
+            "#,
+            r#"
+                struct Foo<'a, T: Foo<'a>> {}
+
+                impl<'a, T: Foo<'a>> $0 for Foo<'a, T> {
+
+                }
+            "#,
+        );
+    }
+
+    #[test]
+    fn test_add_trait_impl_with_attributes() {
+        check_assist(
+            generate_trait_impl,
+            r#"
+                #[cfg(feature = "foo")]
+                struct Foo<'a, T: Foo$0<'a>> {}
+            "#,
+            r#"
+                #[cfg(feature = "foo")]
+                struct Foo<'a, T: Foo<'a>> {}
+
+                #[cfg(feature = "foo")]
+                impl<'a, T: Foo<'a>> $0 for Foo<'a, T> {
+
+                }
+            "#,
+        );
+    }
+
+    #[test]
+    fn test_add_trait_impl_with_default_generic() {
+        check_assist(
+            generate_trait_impl,
+            r#"
+                struct Defaulted$0<T = i32> {}
+            "#,
+            r#"
+                struct Defaulted<T = i32> {}
+
+                impl<T> $0 for Defaulted<T> {
+
+                }
+            "#,
+        );
+    }
+
+    #[test]
+    fn test_add_trait_impl_with_constrained_default_generic() {
+        check_assist(
+            generate_trait_impl,
+            r#"
+                struct Defaulted$0<'a, 'b: 'a, T: Debug + Clone + 'a + 'b = String, const S: usize> {}
+            "#,
+            r#"
+                struct Defaulted<'a, 'b: 'a, T: Debug + Clone + 'a + 'b = String, const S: usize> {}
+
+                impl<'a, 'b: 'a, T: Debug + Clone + 'a + 'b, const S: usize> $0 for Defaulted<'a, 'b, T, S> {
+
+                }
+            "#,
+        );
+    }
+
+    #[test]
+    fn test_add_trait_impl_with_const_defaulted_generic() {
+        check_assist(
+            generate_trait_impl,
+            r#"
+                struct Defaulted$0<const N: i32 = 0> {}
+            "#,
+            r#"
+                struct Defaulted<const N: i32 = 0> {}
+
+                impl<const N: i32> $0 for Defaulted<N> {
+
+                }
+            "#,
+        );
+    }
+
+    #[test]
+    fn test_add_trait_impl_with_trait_constraint() {
+        check_assist(
+            generate_trait_impl,
+            r#"
+                pub trait Trait {}
+                struct Struct$0<T>
+                where
+                    T: Trait,
+                {
+                    inner: T,
+                }
+            "#,
+            r#"
+                pub trait Trait {}
+                struct Struct<T>
+                where
+                    T: Trait,
+                {
+                    inner: T,
+                }
+
+                impl<T> $0 for Struct<T>
+                where
+                    T: Trait,
+                {
+
+                }
+            "#,
+        );
+    }
+
+    #[test]
+    fn add_trait_impl_target() {
+        check_assist_target(
+            generate_trait_impl,
+            r#"
+                struct SomeThingIrrelevant;
+                /// Has a lifetime parameter
+                struct Foo$0<'a, T: Foo<'a>> {}
+                struct EvenMoreIrrelevant;
+            "#,
+            "/// Has a lifetime parameter\nstruct Foo<'a, T: Foo<'a>> {}",
         );
     }
 }
diff --git a/crates/ide-assists/src/handlers/generate_new.rs b/crates/ide-assists/src/handlers/generate_new.rs
index 17fadea0ea..8d311262a7 100644
--- a/crates/ide-assists/src/handlers/generate_new.rs
+++ b/crates/ide-assists/src/handlers/generate_new.rs
@@ -70,7 +70,7 @@ pub(crate) fn generate_new(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option
                 )?;
 
                 let expr = use_trivial_constructor(
-                    &ctx.sema.db,
+                    ctx.sema.db,
                     ide_db::helpers::mod_path_to_ast(&type_path),
                     &ty,
                 )?;
diff --git a/crates/ide-assists/src/handlers/inline_call.rs b/crates/ide-assists/src/handlers/inline_call.rs
index 0c546ce5d4..5ac18727c1 100644
--- a/crates/ide-assists/src/handlers/inline_call.rs
+++ b/crates/ide-assists/src/handlers/inline_call.rs
@@ -394,7 +394,7 @@ fn inline(
     // Inline parameter expressions or generate `let` statements depending on whether inlining works or not.
     for ((pat, param_ty, _), usages, expr) in izip!(params, param_use_nodes, arguments).rev() {
         // izip confuses RA due to our lack of hygiene info currently losing us type info causing incorrect errors
-        let usages: &[ast::PathExpr] = &*usages;
+        let usages: &[ast::PathExpr] = &usages;
         let expr: &ast::Expr = expr;
 
         let insert_let_stmt = || {
diff --git a/crates/ide-assists/src/handlers/inline_macro.rs b/crates/ide-assists/src/handlers/inline_macro.rs
new file mode 100644
index 0000000000..9d03f03d20
--- /dev/null
+++ b/crates/ide-assists/src/handlers/inline_macro.rs
@@ -0,0 +1,233 @@
+use syntax::ast::{self, AstNode};
+
+use crate::{AssistContext, AssistId, AssistKind, Assists};
+
+// Assist: inline_macro
+//
+// Takes a macro and inlines it one step.
+//
+// ```
+// macro_rules! num {
+//     (+$($t:tt)+) => (1 + num!($($t )+));
+//     (-$($t:tt)+) => (-1 + num!($($t )+));
+//     (+) => (1);
+//     (-) => (-1);
+// }
+//
+// fn main() {
+//     let number = num$0!(+ + + - + +);
+//     println!("{number}");
+// }
+// ```
+// ->
+// ```
+// macro_rules! num {
+//     (+$($t:tt)+) => (1 + num!($($t )+));
+//     (-$($t:tt)+) => (-1 + num!($($t )+));
+//     (+) => (1);
+//     (-) => (-1);
+// }
+//
+// fn main() {
+//     let number = 1+num!(+ + - + +);
+//     println!("{number}");
+// }
+// ```
+pub(crate) fn inline_macro(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option<()> {
+    let unexpanded = ctx.find_node_at_offset::<ast::MacroCall>()?;
+    let expanded = ctx.sema.expand(&unexpanded)?.clone_for_update();
+
+    let text_range = unexpanded.syntax().text_range();
+
+    acc.add(
+        AssistId("inline_macro", AssistKind::RefactorRewrite),
+        format!("Inline macro"),
+        text_range,
+        |builder| builder.replace(text_range, expanded.to_string()),
+    )
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    use crate::tests::{check_assist, check_assist_not_applicable, check_assist_target};
+
+    macro_rules! simple_macro {
+        () => {
+            r#"
+macro_rules! foo {
+    (foo) => (true);
+    () => (false);
+}
+"#
+        };
+    }
+    macro_rules! double_macro {
+        () => {
+            r#"
+macro_rules! bar {
+    (bar) => (true);
+    ($($tt:tt)?) => (false);
+}
+macro_rules! foo {
+    (foo) => (true);
+    (bar) => (bar!(bar));
+    ($($tt:tt)?) => (bar!($($tt)?));
+}
+"#
+        };
+    }
+
+    macro_rules! complex_macro {
+        () => {
+            r#"
+macro_rules! num {
+    (+$($t:tt)+) => (1 + num!($($t )+));
+    (-$($t:tt)+) => (-1 + num!($($t )+));
+    (+) => (1);
+    (-) => (-1);
+}
+"#
+        };
+    }
+    #[test]
+    fn inline_macro_target() {
+        check_assist_target(
+            inline_macro,
+            concat!(simple_macro!(), r#"fn f() { let a = foo$0!(foo); }"#),
+            "foo!(foo)",
+        );
+    }
+
+    #[test]
+    fn inline_macro_target_start() {
+        check_assist_target(
+            inline_macro,
+            concat!(simple_macro!(), r#"fn f() { let a = $0foo!(foo); }"#),
+            "foo!(foo)",
+        );
+    }
+
+    #[test]
+    fn inline_macro_target_end() {
+        check_assist_target(
+            inline_macro,
+            concat!(simple_macro!(), r#"fn f() { let a = foo!(foo$0); }"#),
+            "foo!(foo)",
+        );
+    }
+
+    #[test]
+    fn inline_macro_simple_case1() {
+        check_assist(
+            inline_macro,
+            concat!(simple_macro!(), r#"fn f() { let result = foo$0!(foo); }"#),
+            concat!(simple_macro!(), r#"fn f() { let result = true; }"#),
+        );
+    }
+
+    #[test]
+    fn inline_macro_simple_case2() {
+        check_assist(
+            inline_macro,
+            concat!(simple_macro!(), r#"fn f() { let result = foo$0!(); }"#),
+            concat!(simple_macro!(), r#"fn f() { let result = false; }"#),
+        );
+    }
+
+    #[test]
+    fn inline_macro_simple_not_applicable() {
+        check_assist_not_applicable(
+            inline_macro,
+            concat!(simple_macro!(), r#"fn f() { let result$0 = foo!(foo); }"#),
+        );
+    }
+
+    #[test]
+    fn inline_macro_simple_not_applicable_broken_macro() {
+        // FIXME: This is a bug. The macro should not expand, but it's
+        // the same behaviour as the "Expand Macro Recursively" commmand
+        // so it's presumably OK for the time being.
+        check_assist(
+            inline_macro,
+            concat!(simple_macro!(), r#"fn f() { let result = foo$0!(asdfasdf); }"#),
+            concat!(simple_macro!(), r#"fn f() { let result = true; }"#),
+        );
+    }
+
+    #[test]
+    fn inline_macro_double_case1() {
+        check_assist(
+            inline_macro,
+            concat!(double_macro!(), r#"fn f() { let result = foo$0!(bar); }"#),
+            concat!(double_macro!(), r#"fn f() { let result = bar!(bar); }"#),
+        );
+    }
+
+    #[test]
+    fn inline_macro_double_case2() {
+        check_assist(
+            inline_macro,
+            concat!(double_macro!(), r#"fn f() { let result = foo$0!(asdf); }"#),
+            concat!(double_macro!(), r#"fn f() { let result = bar!(asdf); }"#),
+        );
+    }
+
+    #[test]
+    fn inline_macro_complex_case1() {
+        check_assist(
+            inline_macro,
+            concat!(complex_macro!(), r#"fn f() { let result = num!(+ +$0 + - +); }"#),
+            concat!(complex_macro!(), r#"fn f() { let result = 1+num!(+ + - +); }"#),
+        );
+    }
+
+    #[test]
+    fn inline_macro_complex_case2() {
+        check_assist(
+            inline_macro,
+            concat!(complex_macro!(), r#"fn f() { let result = n$0um!(- + + - +); }"#),
+            concat!(complex_macro!(), r#"fn f() { let result = -1+num!(+ + - +); }"#),
+        );
+    }
+
+    #[test]
+    fn inline_macro_recursive_macro() {
+        check_assist(
+            inline_macro,
+            r#"
+macro_rules! foo {
+  () => {foo!()}
+}
+fn f() { let result = foo$0!(); }
+"#,
+            r#"
+macro_rules! foo {
+  () => {foo!()}
+}
+fn f() { let result = foo!(); }
+"#,
+        );
+    }
+
+    #[test]
+    fn inline_macro_unknown_macro() {
+        check_assist_not_applicable(
+            inline_macro,
+            r#"
+fn f() { let result = foo$0!(); }
+"#,
+        );
+    }
+
+    #[test]
+    fn inline_macro_function_call_not_applicable() {
+        check_assist_not_applicable(
+            inline_macro,
+            r#"
+fn f() { let result = foo$0(); }
+"#,
+        );
+    }
+}
diff --git a/crates/ide-assists/src/handlers/inline_type_alias.rs b/crates/ide-assists/src/handlers/inline_type_alias.rs
index 353d467ed1..5982e9d61d 100644
--- a/crates/ide-assists/src/handlers/inline_type_alias.rs
+++ b/crates/ide-assists/src/handlers/inline_type_alias.rs
@@ -138,7 +138,7 @@ pub(crate) fn inline_type_alias(acc: &mut Assists, ctx: &AssistContext<'_>) -> O
             replacement = Replacement::Plain;
         }
         _ => {
-            let alias = get_type_alias(&ctx, &alias_instance)?;
+            let alias = get_type_alias(ctx, &alias_instance)?;
             concrete_type = alias.ty()?;
             replacement = inline(&alias, &alias_instance)?;
         }
@@ -158,7 +158,7 @@ impl Replacement {
     fn to_text(&self, concrete_type: &ast::Type) -> String {
         match self {
             Replacement::Generic { lifetime_map, const_and_type_map } => {
-                create_replacement(&lifetime_map, &const_and_type_map, &concrete_type)
+                create_replacement(lifetime_map, const_and_type_map, concrete_type)
             }
             Replacement::Plain => concrete_type.to_string(),
         }
@@ -240,7 +240,7 @@ impl ConstAndTypeMap {
     ) -> Option<Self> {
         let mut inner = HashMap::new();
         let instance_generics = generic_args_to_const_and_type_generics(instance_args);
-        let alias_generics = generic_param_list_to_const_and_type_generics(&alias_generics);
+        let alias_generics = generic_param_list_to_const_and_type_generics(alias_generics);
 
         if instance_generics.len() > alias_generics.len() {
             cov_mark::hit!(too_many_generic_args);
diff --git a/crates/ide-assists/src/handlers/move_const_to_impl.rs b/crates/ide-assists/src/handlers/move_const_to_impl.rs
new file mode 100644
index 0000000000..0e3a1e652b
--- /dev/null
+++ b/crates/ide-assists/src/handlers/move_const_to_impl.rs
@@ -0,0 +1,481 @@
+use hir::{AsAssocItem, AssocItemContainer, HasCrate, HasSource};
+use ide_db::{assists::AssistId, base_db::FileRange, defs::Definition, search::SearchScope};
+use syntax::{
+    ast::{self, edit::IndentLevel, edit_in_place::Indent, AstNode},
+    SyntaxKind,
+};
+
+use crate::{
+    assist_context::{AssistContext, Assists},
+    utils,
+};
+
+// NOTE: Code may break if the self type implements a trait that has associated const with the same
+// name, but it's pretty expensive to check that (`hir::Impl::all_for_type()`) and we assume that's
+// pretty rare case.
+
+// Assist: move_const_to_impl
+//
+// Move a local constant item in a method to impl's associated constant. All the references will be
+// qualified with `Self::`.
+//
+// ```
+// struct S;
+// impl S {
+//     fn foo() -> usize {
+//         /// The answer.
+//         const C$0: usize = 42;
+//
+//         C * C
+//     }
+// }
+// ```
+// ->
+// ```
+// struct S;
+// impl S {
+//     /// The answer.
+//     const C: usize = 42;
+//
+//     fn foo() -> usize {
+//         Self::C * Self::C
+//     }
+// }
+// ```
+pub(crate) fn move_const_to_impl(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option<()> {
+    let db = ctx.db();
+    let const_: ast::Const = ctx.find_node_at_offset()?;
+    // Don't show the assist when the cursor is at the const's body.
+    if let Some(body) = const_.body() {
+        if body.syntax().text_range().contains(ctx.offset()) {
+            return None;
+        }
+    }
+
+    let parent_fn = const_.syntax().ancestors().find_map(ast::Fn::cast)?;
+
+    // NOTE: We can technically provide this assist for default methods in trait definitions, but
+    // it's somewhat complex to handle it correctly when the const's name conflicts with
+    // supertrait's item. We may want to consider implementing it in the future.
+    let AssocItemContainer::Impl(impl_) = ctx.sema.to_def(&parent_fn)?.as_assoc_item(db)?.container(db) else { return None; };
+    if impl_.trait_(db).is_some() {
+        return None;
+    }
+
+    let def = ctx.sema.to_def(&const_)?;
+    let name = def.name(db)?;
+    let items = impl_.source(db)?.value.assoc_item_list()?;
+
+    let ty = impl_.self_ty(db);
+    // If there exists another associated item with the same name, skip the assist.
+    if ty
+        .iterate_assoc_items(db, ty.krate(db), |assoc| {
+            // Type aliases wouldn't conflict due to different namespaces, but we're only checking
+            // the items in inherent impls, so we assume `assoc` is never type alias for the sake
+            // of brevity (inherent associated types exist in nightly Rust, but it's *very*
+            // unstable and we don't support them either).
+            assoc.name(db).filter(|it| it == &name)
+        })
+        .is_some()
+    {
+        return None;
+    }
+
+    let usages =
+        Definition::Const(def).usages(&ctx.sema).in_scope(SearchScope::file_range(FileRange {
+            file_id: ctx.file_id(),
+            range: parent_fn.syntax().text_range(),
+        }));
+
+    acc.add(
+        AssistId("move_const_to_impl", crate::AssistKind::RefactorRewrite),
+        "Move const to impl block",
+        const_.syntax().text_range(),
+        |builder| {
+            let range_to_delete = match const_.syntax().next_sibling_or_token() {
+                Some(s) if matches!(s.kind(), SyntaxKind::WHITESPACE) => {
+                    // Remove following whitespaces too.
+                    const_.syntax().text_range().cover(s.text_range())
+                }
+                _ => const_.syntax().text_range(),
+            };
+            builder.delete(range_to_delete);
+
+            let const_ref = format!("Self::{name}");
+            for range in usages.all().file_ranges().map(|it| it.range) {
+                builder.replace(range, const_ref.clone());
+            }
+
+            // Heuristically inserting the extracted const after the consecutive existing consts
+            // from the beginning of assoc items. We assume there are no inherent assoc type as
+            // above.
+            let last_const =
+                items.assoc_items().take_while(|it| matches!(it, ast::AssocItem::Const(_))).last();
+            let insert_offset = match &last_const {
+                Some(it) => it.syntax().text_range().end(),
+                None => match items.l_curly_token() {
+                    Some(l_curly) => l_curly.text_range().end(),
+                    // Not sure if this branch is ever reachable, but it wouldn't hurt to have a
+                    // fallback.
+                    None => items.syntax().text_range().start(),
+                },
+            };
+
+            // If the moved const will be the first item of the impl, add a new line after that.
+            //
+            // We're assuming the code is formatted according to Rust's standard style guidelines
+            // (i.e. no empty lines between impl's `{` token and its first assoc item).
+            let fixup = if last_const.is_none() { "\n" } else { "" };
+            let indent = IndentLevel::from_node(parent_fn.syntax());
+
+            let const_ = const_.clone_for_update();
+            const_.reindent_to(indent);
+            let mut const_text = format!("\n{indent}{const_}{fixup}");
+            utils::escape_non_snippet(&mut const_text);
+            builder.insert(insert_offset, const_text);
+        },
+    )
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::tests::{check_assist, check_assist_not_applicable};
+
+    use super::*;
+
+    #[test]
+    fn not_applicable_to_top_level_const() {
+        check_assist_not_applicable(
+            move_const_to_impl,
+            r#"
+const C$0: () = ();
+"#,
+        );
+    }
+
+    #[test]
+    fn not_applicable_to_free_fn() {
+        check_assist_not_applicable(
+            move_const_to_impl,
+            r#"
+fn f() {
+    const C$0: () = ();
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn not_applicable_when_at_const_body() {
+        check_assist_not_applicable(
+            move_const_to_impl,
+            r#"
+struct S;
+impl S {
+    fn f() {
+        const C: () = ($0);
+    }
+}
+            "#,
+        );
+    }
+
+    #[test]
+    fn not_applicable_when_inside_const_body_block() {
+        check_assist_not_applicable(
+            move_const_to_impl,
+            r#"
+struct S;
+impl S {
+    fn f() {
+        const C: () = {
+            ($0)
+        };
+    }
+}
+            "#,
+        );
+    }
+
+    #[test]
+    fn not_applicable_to_trait_impl_fn() {
+        check_assist_not_applicable(
+            move_const_to_impl,
+            r#"
+trait Trait {
+    fn f();
+}
+impl Trait for () {
+    fn f() {
+        const C$0: () = ();
+    }
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn not_applicable_to_non_assoc_fn_inside_impl() {
+        check_assist_not_applicable(
+            move_const_to_impl,
+            r#"
+struct S;
+impl S {
+    fn f() {
+        fn g() {
+            const C$0: () = ();
+        }
+    }
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn not_applicable_when_const_with_same_name_exists() {
+        check_assist_not_applicable(
+            move_const_to_impl,
+            r#"
+struct S;
+impl S {
+    const C: usize = 42;
+    fn f() {
+        const C$0: () = ();
+    }
+"#,
+        );
+
+        check_assist_not_applicable(
+            move_const_to_impl,
+            r#"
+struct S;
+impl S {
+    const C: usize = 42;
+}
+impl S {
+    fn f() {
+        const C$0: () = ();
+    }
+"#,
+        );
+    }
+
+    #[test]
+    fn move_const_simple_body() {
+        check_assist(
+            move_const_to_impl,
+            r#"
+struct S;
+impl S {
+    fn f() -> usize {
+        /// doc comment
+        const C$0: usize = 42;
+
+        C * C
+    }
+}
+"#,
+            r#"
+struct S;
+impl S {
+    /// doc comment
+    const C: usize = 42;
+
+    fn f() -> usize {
+        Self::C * Self::C
+    }
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn move_const_simple_body_existing_const() {
+        check_assist(
+            move_const_to_impl,
+            r#"
+struct S;
+impl S {
+    const X: () = ();
+    const Y: () = ();
+
+    fn f() -> usize {
+        /// doc comment
+        const C$0: usize = 42;
+
+        C * C
+    }
+}
+"#,
+            r#"
+struct S;
+impl S {
+    const X: () = ();
+    const Y: () = ();
+    /// doc comment
+    const C: usize = 42;
+
+    fn f() -> usize {
+        Self::C * Self::C
+    }
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn move_const_block_body() {
+        check_assist(
+            move_const_to_impl,
+            r#"
+struct S;
+impl S {
+    fn f() -> usize {
+        /// doc comment
+        const C$0: usize = {
+            let a = 3;
+            let b = 4;
+            a * b
+        };
+
+        C * C
+    }
+}
+"#,
+            r#"
+struct S;
+impl S {
+    /// doc comment
+    const C: usize = {
+        let a = 3;
+        let b = 4;
+        a * b
+    };
+
+    fn f() -> usize {
+        Self::C * Self::C
+    }
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn correct_indent_when_nested() {
+        check_assist(
+            move_const_to_impl,
+            r#"
+fn main() {
+    struct S;
+    impl S {
+        fn f() -> usize {
+            /// doc comment
+            const C$0: usize = 42;
+
+            C * C
+        }
+    }
+}
+"#,
+            r#"
+fn main() {
+    struct S;
+    impl S {
+        /// doc comment
+        const C: usize = 42;
+
+        fn f() -> usize {
+            Self::C * Self::C
+        }
+    }
+}
+"#,
+        )
+    }
+
+    #[test]
+    fn move_const_in_nested_scope_with_same_name_in_other_scope() {
+        check_assist(
+            move_const_to_impl,
+            r#"
+struct S;
+impl S {
+    fn f() -> usize {
+        const C: &str = "outer";
+
+        let n = {
+            /// doc comment
+            const C$0: usize = 42;
+
+            let m = {
+                const C: &str = "inner";
+                C.len()
+            };
+
+            C * m
+        };
+
+        n + C.len()
+    }
+}
+"#,
+            r#"
+struct S;
+impl S {
+    /// doc comment
+    const C: usize = 42;
+
+    fn f() -> usize {
+        const C: &str = "outer";
+
+        let n = {
+            let m = {
+                const C: &str = "inner";
+                C.len()
+            };
+
+            Self::C * m
+        };
+
+        n + C.len()
+    }
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn moved_const_body_is_escaped() {
+        // Note that the last argument is what *lsp clients would see* rather than
+        // what users would see. Unescaping happens thereafter.
+        check_assist(
+            move_const_to_impl,
+            r#"
+struct S;
+impl S {
+    fn f() -> usize {
+        /// doc comment
+        /// \\
+        /// ${snippet}
+        const C$0: &str = "\ and $1";
+
+        C.len()
+    }
+}
+"#,
+            r#"
+struct S;
+impl S {
+    /// doc comment
+    /// \\\\
+    /// \${snippet}
+    const C: &str = "\\ and \$1";
+
+    fn f() -> usize {
+        Self::C.len()
+    }
+}
+"#,
+        )
+    }
+}
diff --git a/crates/ide-assists/src/handlers/qualify_method_call.rs b/crates/ide-assists/src/handlers/qualify_method_call.rs
index 1ea87429c5..e7014597a1 100644
--- a/crates/ide-assists/src/handlers/qualify_method_call.rs
+++ b/crates/ide-assists/src/handlers/qualify_method_call.rs
@@ -53,7 +53,7 @@ pub(crate) fn qualify_method_call(acc: &mut Assists, ctx: &AssistContext<'_>) ->
     let qualify_candidate = QualifyCandidate::ImplMethod(ctx.sema.db, call, resolved_call);
 
     acc.add(
-        AssistId("qualify_method_call", AssistKind::RefactorInline),
+        AssistId("qualify_method_call", AssistKind::RefactorRewrite),
         format!("Qualify `{ident}` method call"),
         range,
         |builder| {
diff --git a/crates/ide-assists/src/handlers/remove_dbg.rs b/crates/ide-assists/src/handlers/remove_dbg.rs
index 99ae60e07b..52dd670ec2 100644
--- a/crates/ide-assists/src/handlers/remove_dbg.rs
+++ b/crates/ide-assists/src/handlers/remove_dbg.rs
@@ -64,7 +64,7 @@ fn compute_dbg_replacement(macro_call: ast::MacroCall) -> Option<(TextRange, Str
     let input_expressions = mac_input.group_by(|tok| tok.kind() == T![,]);
     let input_expressions = input_expressions
         .into_iter()
-        .filter_map(|(is_sep, group)| (!is_sep).then(|| group))
+        .filter_map(|(is_sep, group)| (!is_sep).then_some(group))
         .map(|mut tokens| syntax::hacks::parse_expr_from_str(&tokens.join("")))
         .collect::<Option<Vec<ast::Expr>>>()?;
 
diff --git a/crates/ide-assists/src/handlers/remove_parentheses.rs b/crates/ide-assists/src/handlers/remove_parentheses.rs
new file mode 100644
index 0000000000..e9c7c6bae9
--- /dev/null
+++ b/crates/ide-assists/src/handlers/remove_parentheses.rs
@@ -0,0 +1,221 @@
+use syntax::{ast, AstNode};
+
+use crate::{AssistContext, AssistId, AssistKind, Assists};
+
+// Assist: remove_parentheses
+//
+// Removes redundant parentheses.
+//
+// ```
+// fn main() {
+//     _ = $0(2) + 2;
+// }
+// ```
+// ->
+// ```
+// fn main() {
+//     _ = 2 + 2;
+// }
+// ```
+pub(crate) fn remove_parentheses(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option<()> {
+    let parens = ctx.find_node_at_offset::<ast::ParenExpr>()?;
+
+    let cursor_in_range =
+        parens.l_paren_token()?.text_range().contains_range(ctx.selection_trimmed())
+            || parens.r_paren_token()?.text_range().contains_range(ctx.selection_trimmed());
+    if !cursor_in_range {
+        return None;
+    }
+
+    let expr = parens.expr()?;
+
+    let parent = parens.syntax().parent()?;
+    if expr.needs_parens_in(parent) {
+        return None;
+    }
+
+    let target = parens.syntax().text_range();
+    acc.add(
+        AssistId("remove_parentheses", AssistKind::Refactor),
+        "Remove redundant parentheses",
+        target,
+        |builder| builder.replace_ast(parens.into(), expr),
+    )
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::tests::{check_assist, check_assist_not_applicable};
+
+    use super::*;
+
+    #[test]
+    fn remove_parens_simple() {
+        check_assist(remove_parentheses, r#"fn f() { $0(2) + 2; }"#, r#"fn f() { 2 + 2; }"#);
+        check_assist(remove_parentheses, r#"fn f() { ($02) + 2; }"#, r#"fn f() { 2 + 2; }"#);
+        check_assist(remove_parentheses, r#"fn f() { (2)$0 + 2; }"#, r#"fn f() { 2 + 2; }"#);
+        check_assist(remove_parentheses, r#"fn f() { (2$0) + 2; }"#, r#"fn f() { 2 + 2; }"#);
+    }
+
+    #[test]
+    fn remove_parens_closure() {
+        check_assist(remove_parentheses, r#"fn f() { &$0(|| 42) }"#, r#"fn f() { &|| 42 }"#);
+
+        check_assist_not_applicable(remove_parentheses, r#"fn f() { $0(|| 42).f() }"#);
+    }
+
+    #[test]
+    fn remove_parens_if_let_chains() {
+        check_assist_not_applicable(
+            remove_parentheses,
+            r#"fn f() { if let true = $0(true && true) {} }"#,
+        );
+    }
+
+    #[test]
+    fn remove_parens_associativity() {
+        check_assist(
+            remove_parentheses,
+            r#"fn f() { $0(2 + 2) + 2; }"#,
+            r#"fn f() { 2 + 2 + 2; }"#,
+        );
+        check_assist_not_applicable(remove_parentheses, r#"fn f() { 2 + $0(2 + 2); }"#);
+    }
+
+    #[test]
+    fn remove_parens_precedence() {
+        check_assist(
+            remove_parentheses,
+            r#"fn f() { $0(2 * 3) + 1; }"#,
+            r#"fn f() { 2 * 3 + 1; }"#,
+        );
+        check_assist(remove_parentheses, r#"fn f() { ( $0(2) ); }"#, r#"fn f() { ( 2 ); }"#);
+        check_assist(remove_parentheses, r#"fn f() { $0(2?)?; }"#, r#"fn f() { 2??; }"#);
+        check_assist(remove_parentheses, r#"fn f() { f(($02 + 2)); }"#, r#"fn f() { f(2 + 2); }"#);
+        check_assist(
+            remove_parentheses,
+            r#"fn f() { (1<2)&&$0(3>4); }"#,
+            r#"fn f() { (1<2)&&3>4; }"#,
+        );
+    }
+
+    #[test]
+    fn remove_parens_doesnt_apply_precedence() {
+        check_assist_not_applicable(remove_parentheses, r#"fn f() { $0(2 + 2) * 8; }"#);
+        check_assist_not_applicable(remove_parentheses, r#"fn f() { $0(2 + 2).f(); }"#);
+        check_assist_not_applicable(remove_parentheses, r#"fn f() { $0(2 + 2).await; }"#);
+        check_assist_not_applicable(remove_parentheses, r#"fn f() { $0!(2..2); }"#);
+    }
+
+    #[test]
+    fn remove_parens_doesnt_apply_with_cursor_not_on_paren() {
+        check_assist_not_applicable(remove_parentheses, r#"fn f() { (2 +$0 2) }"#);
+        check_assist_not_applicable(remove_parentheses, r#"fn f() {$0 (2 + 2) }"#);
+    }
+
+    #[test]
+    fn remove_parens_doesnt_apply_when_expr_would_be_turned_into_a_statement() {
+        check_assist_not_applicable(remove_parentheses, r#"fn x() -> u8 { $0({ 0 } + 1) }"#);
+        check_assist_not_applicable(
+            remove_parentheses,
+            r#"fn x() -> u8 { $0(if true { 0 } else { 1 } + 1) }"#,
+        );
+        check_assist_not_applicable(remove_parentheses, r#"fn x() -> u8 { $0(loop {} + 1) }"#);
+    }
+
+    #[test]
+    fn remove_parens_doesnt_apply_weird_syntax_and_adge_cases() {
+        // removing `()` would break code because {} would be counted as the loop/if body
+        check_assist_not_applicable(remove_parentheses, r#"fn f() { for _ in $0(0..{3}) {} }"#);
+        check_assist_not_applicable(remove_parentheses, r#"fn f() { for _ in $0(S {}) {} }"#);
+        check_assist_not_applicable(remove_parentheses, r#"fn f() { if $0(S {} == 2) {} }"#);
+        check_assist_not_applicable(remove_parentheses, r#"fn f() { if $0(return) {} }"#);
+    }
+
+    #[test]
+    fn remove_parens_return_with_value_followed_by_block() {
+        check_assist(
+            remove_parentheses,
+            r#"fn f() { if $0(return ()) {} }"#,
+            r#"fn f() { if return () {} }"#,
+        );
+    }
+
+    #[test]
+    fn remove_exprs_let_else_restrictions() {
+        // `}` is not allowed before `else` here
+        check_assist_not_applicable(
+            remove_parentheses,
+            r#"fn f() { let _ = $0(S{}) else { return }; }"#,
+        );
+
+        // logic operators can't directly appear in the let-else
+        check_assist_not_applicable(
+            remove_parentheses,
+            r#"fn f() { let _ = $0(false || false) else { return }; }"#,
+        );
+        check_assist_not_applicable(
+            remove_parentheses,
+            r#"fn f() { let _ = $0(true && true) else { return }; }"#,
+        );
+    }
+
+    #[test]
+    fn remove_parens_weird_places() {
+        check_assist(
+            remove_parentheses,
+            r#"fn f() { match () { _=>$0(()) } }"#,
+            r#"fn f() { match () { _=>() } }"#,
+        );
+
+        check_assist(
+            remove_parentheses,
+            r#"fn x() -> u8 { { [$0({ 0 } + 1)] } }"#,
+            r#"fn x() -> u8 { { [{ 0 } + 1] } }"#,
+        );
+    }
+
+    #[test]
+    fn remove_parens_return_dot_f() {
+        check_assist(
+            remove_parentheses,
+            r#"fn f() { $0(return).f() }"#,
+            r#"fn f() { return.f() }"#,
+        );
+    }
+
+    #[test]
+    fn remove_parens_prefix_then_return_something() {
+        check_assist(
+            remove_parentheses,
+            r#"fn f() { &$0(return ()) }"#,
+            r#"fn f() { &return () }"#,
+        );
+    }
+
+    #[test]
+    fn remove_parens_double_paren_stmt() {
+        check_assist(
+            remove_parentheses,
+            r#"fn x() -> u8 { $0(({ 0 } + 1)) }"#,
+            r#"fn x() -> u8 { ({ 0 } + 1) }"#,
+        );
+
+        check_assist(
+            remove_parentheses,
+            r#"fn x() -> u8 { (($0{ 0 } + 1)) }"#,
+            r#"fn x() -> u8 { ({ 0 } + 1) }"#,
+        );
+    }
+
+    #[test]
+    fn remove_parens_im_tired_of_naming_tests() {
+        check_assist(
+            remove_parentheses,
+            r#"fn f() { 2 + $0(return 2) }"#,
+            r#"fn f() { 2 + return 2 }"#,
+        );
+
+        check_assist_not_applicable(remove_parentheses, r#"fn f() { $0(return 2) + 2 }"#);
+    }
+}
diff --git a/crates/ide-assists/src/handlers/replace_arith_op.rs b/crates/ide-assists/src/handlers/replace_arith_op.rs
new file mode 100644
index 0000000000..f1ca35cafc
--- /dev/null
+++ b/crates/ide-assists/src/handlers/replace_arith_op.rs
@@ -0,0 +1,226 @@
+use ide_db::assists::{AssistId, AssistKind, GroupLabel};
+use syntax::{
+    ast::{self, ArithOp, BinaryOp},
+    AstNode, TextRange,
+};
+
+use crate::assist_context::{AssistContext, Assists};
+
+// Assist: replace_arith_with_checked
+//
+// Replaces arithmetic on integers with the `checked_*` equivalent.
+//
+// ```
+// fn main() {
+//   let x = 1 $0+ 2;
+// }
+// ```
+// ->
+// ```
+// fn main() {
+//   let x = 1.checked_add(2);
+// }
+// ```
+pub(crate) fn replace_arith_with_checked(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option<()> {
+    replace_arith(acc, ctx, ArithKind::Checked)
+}
+
+// Assist: replace_arith_with_saturating
+//
+// Replaces arithmetic on integers with the `saturating_*` equivalent.
+//
+// ```
+// fn main() {
+//   let x = 1 $0+ 2;
+// }
+// ```
+// ->
+// ```
+// fn main() {
+//   let x = 1.saturating_add(2);
+// }
+// ```
+pub(crate) fn replace_arith_with_saturating(
+    acc: &mut Assists,
+    ctx: &AssistContext<'_>,
+) -> Option<()> {
+    replace_arith(acc, ctx, ArithKind::Saturating)
+}
+
+// Assist: replace_arith_with_wrapping
+//
+// Replaces arithmetic on integers with the `wrapping_*` equivalent.
+//
+// ```
+// fn main() {
+//   let x = 1 $0+ 2;
+// }
+// ```
+// ->
+// ```
+// fn main() {
+//   let x = 1.wrapping_add(2);
+// }
+// ```
+pub(crate) fn replace_arith_with_wrapping(
+    acc: &mut Assists,
+    ctx: &AssistContext<'_>,
+) -> Option<()> {
+    replace_arith(acc, ctx, ArithKind::Wrapping)
+}
+
+fn replace_arith(acc: &mut Assists, ctx: &AssistContext<'_>, kind: ArithKind) -> Option<()> {
+    let (lhs, op, rhs) = parse_binary_op(ctx)?;
+
+    if !is_primitive_int(ctx, &lhs) || !is_primitive_int(ctx, &rhs) {
+        return None;
+    }
+
+    let start = lhs.syntax().text_range().start();
+    let end = rhs.syntax().text_range().end();
+    let range = TextRange::new(start, end);
+
+    acc.add_group(
+        &GroupLabel("replace_arith".into()),
+        kind.assist_id(),
+        kind.label(),
+        range,
+        |builder| {
+            let method_name = kind.method_name(op);
+
+            builder.replace(range, format!("{lhs}.{method_name}({rhs})"))
+        },
+    )
+}
+
+fn is_primitive_int(ctx: &AssistContext<'_>, expr: &ast::Expr) -> bool {
+    match ctx.sema.type_of_expr(expr) {
+        Some(ty) => ty.adjusted().is_int_or_uint(),
+        _ => false,
+    }
+}
+
+/// Extract the operands of an arithmetic expression (e.g. `1 + 2` or `1.checked_add(2)`)
+fn parse_binary_op(ctx: &AssistContext<'_>) -> Option<(ast::Expr, ArithOp, ast::Expr)> {
+    let expr = ctx.find_node_at_offset::<ast::BinExpr>()?;
+
+    let op = match expr.op_kind() {
+        Some(BinaryOp::ArithOp(ArithOp::Add)) => ArithOp::Add,
+        Some(BinaryOp::ArithOp(ArithOp::Sub)) => ArithOp::Sub,
+        Some(BinaryOp::ArithOp(ArithOp::Mul)) => ArithOp::Mul,
+        Some(BinaryOp::ArithOp(ArithOp::Div)) => ArithOp::Div,
+        _ => return None,
+    };
+
+    let lhs = expr.lhs()?;
+    let rhs = expr.rhs()?;
+
+    Some((lhs, op, rhs))
+}
+
+pub(crate) enum ArithKind {
+    Saturating,
+    Wrapping,
+    Checked,
+}
+
+impl ArithKind {
+    fn assist_id(&self) -> AssistId {
+        let s = match self {
+            ArithKind::Saturating => "replace_arith_with_saturating",
+            ArithKind::Checked => "replace_arith_with_checked",
+            ArithKind::Wrapping => "replace_arith_with_wrapping",
+        };
+
+        AssistId(s, AssistKind::RefactorRewrite)
+    }
+
+    fn label(&self) -> &'static str {
+        match self {
+            ArithKind::Saturating => "Replace arithmetic with call to saturating_*",
+            ArithKind::Checked => "Replace arithmetic with call to checked_*",
+            ArithKind::Wrapping => "Replace arithmetic with call to wrapping_*",
+        }
+    }
+
+    fn method_name(&self, op: ArithOp) -> String {
+        let prefix = match self {
+            ArithKind::Checked => "checked_",
+            ArithKind::Wrapping => "wrapping_",
+            ArithKind::Saturating => "saturating_",
+        };
+
+        let suffix = match op {
+            ArithOp::Add => "add",
+            ArithOp::Sub => "sub",
+            ArithOp::Mul => "mul",
+            ArithOp::Div => "div",
+            _ => unreachable!("this function should only be called with +, -, / or *"),
+        };
+        format!("{prefix}{suffix}")
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::tests::check_assist;
+
+    use super::*;
+
+    #[test]
+    fn arith_kind_method_name() {
+        assert_eq!(ArithKind::Saturating.method_name(ArithOp::Add), "saturating_add");
+        assert_eq!(ArithKind::Checked.method_name(ArithOp::Sub), "checked_sub");
+    }
+
+    #[test]
+    fn replace_arith_with_checked_add() {
+        check_assist(
+            replace_arith_with_checked,
+            r#"
+fn main() {
+    let x = 1 $0+ 2;
+}
+"#,
+            r#"
+fn main() {
+    let x = 1.checked_add(2);
+}
+"#,
+        )
+    }
+
+    #[test]
+    fn replace_arith_with_saturating_add() {
+        check_assist(
+            replace_arith_with_saturating,
+            r#"
+fn main() {
+    let x = 1 $0+ 2;
+}
+"#,
+            r#"
+fn main() {
+    let x = 1.saturating_add(2);
+}
+"#,
+        )
+    }
+
+    #[test]
+    fn replace_arith_with_wrapping_add() {
+        check_assist(
+            replace_arith_with_wrapping,
+            r#"
+fn main() {
+    let x = 1 $0+ 2;
+}
+"#,
+            r#"
+fn main() {
+    let x = 1.wrapping_add(2);
+}
+"#,
+        )
+    }
+}
diff --git a/crates/ide-assists/src/handlers/replace_derive_with_manual_impl.rs b/crates/ide-assists/src/handlers/replace_derive_with_manual_impl.rs
index 6fa15b28e4..a6693d7d79 100644
--- a/crates/ide-assists/src/handlers/replace_derive_with_manual_impl.rs
+++ b/crates/ide-assists/src/handlers/replace_derive_with_manual_impl.rs
@@ -907,7 +907,34 @@ impl PartialEq for Foo {
     }
 
     #[test]
-    fn add_custom_impl_partial_eq_tuple_enum() {
+    fn add_custom_impl_partial_eq_single_variant_tuple_enum() {
+        check_assist(
+            replace_derive_with_manual_impl,
+            r#"
+//- minicore: eq, derive
+#[derive(Partial$0Eq)]
+enum Foo {
+    Bar(String),
+}
+"#,
+            r#"
+enum Foo {
+    Bar(String),
+}
+
+impl PartialEq for Foo {
+    $0fn eq(&self, other: &Self) -> bool {
+        match (self, other) {
+            (Self::Bar(l0), Self::Bar(r0)) => l0 == r0,
+        }
+    }
+}
+"#,
+        )
+    }
+
+    #[test]
+    fn add_custom_impl_partial_eq_partial_tuple_enum() {
         check_assist(
             replace_derive_with_manual_impl,
             r#"
@@ -936,6 +963,99 @@ impl PartialEq for Foo {
         )
     }
 
+    #[test]
+    fn add_custom_impl_partial_eq_tuple_enum() {
+        check_assist(
+            replace_derive_with_manual_impl,
+            r#"
+//- minicore: eq, derive
+#[derive(Partial$0Eq)]
+enum Foo {
+    Bar(String),
+    Baz(i32),
+}
+"#,
+            r#"
+enum Foo {
+    Bar(String),
+    Baz(i32),
+}
+
+impl PartialEq for Foo {
+    $0fn eq(&self, other: &Self) -> bool {
+        match (self, other) {
+            (Self::Bar(l0), Self::Bar(r0)) => l0 == r0,
+            (Self::Baz(l0), Self::Baz(r0)) => l0 == r0,
+            _ => false,
+        }
+    }
+}
+"#,
+        )
+    }
+
+    #[test]
+    fn add_custom_impl_partial_eq_tuple_enum_generic() {
+        check_assist(
+            replace_derive_with_manual_impl,
+            r#"
+//- minicore: eq, derive
+#[derive(Partial$0Eq)]
+enum Either<T, U> {
+    Left(T),
+    Right(U),
+}
+"#,
+            r#"
+enum Either<T, U> {
+    Left(T),
+    Right(U),
+}
+
+impl<T: PartialEq, U: PartialEq> PartialEq for Either<T, U> {
+    $0fn eq(&self, other: &Self) -> bool {
+        match (self, other) {
+            (Self::Left(l0), Self::Left(r0)) => l0 == r0,
+            (Self::Right(l0), Self::Right(r0)) => l0 == r0,
+            _ => false,
+        }
+    }
+}
+"#,
+        )
+    }
+
+    #[test]
+    fn add_custom_impl_partial_eq_tuple_enum_generic_existing_bounds() {
+        check_assist(
+            replace_derive_with_manual_impl,
+            r#"
+//- minicore: eq, derive
+#[derive(Partial$0Eq)]
+enum Either<T: PartialEq + Error, U: Clone> {
+    Left(T),
+    Right(U),
+}
+"#,
+            r#"
+enum Either<T: PartialEq + Error, U: Clone> {
+    Left(T),
+    Right(U),
+}
+
+impl<T: PartialEq + Error, U: Clone + PartialEq> PartialEq for Either<T, U> {
+    $0fn eq(&self, other: &Self) -> bool {
+        match (self, other) {
+            (Self::Left(l0), Self::Left(r0)) => l0 == r0,
+            (Self::Right(l0), Self::Right(r0)) => l0 == r0,
+            _ => false,
+        }
+    }
+}
+"#,
+        )
+    }
+
     #[test]
     fn add_custom_impl_partial_eq_record_enum() {
         check_assist(
@@ -1112,7 +1232,7 @@ struct Foo<T, U> {
     bar: U,
 }
 
-impl<T, U> Default for Foo<T, U> {
+impl<T: Default, U: Default> Default for Foo<T, U> {
     $0fn default() -> Self {
         Self { foo: Default::default(), bar: Default::default() }
     }
diff --git a/crates/ide-assists/src/handlers/replace_or_with_or_else.rs b/crates/ide-assists/src/handlers/replace_or_with_or_else.rs
index 77382056c1..f0ed3c4fe6 100644
--- a/crates/ide-assists/src/handlers/replace_or_with_or_else.rs
+++ b/crates/ide-assists/src/handlers/replace_or_with_or_else.rs
@@ -75,7 +75,7 @@ fn into_closure(param: &Expr) -> Expr {
     (|| {
         if let ast::Expr::CallExpr(call) = param {
             if call.arg_list()?.args().count() == 0 {
-                Some(call.expr()?.clone())
+                Some(call.expr()?)
             } else {
                 None
             }
@@ -151,7 +151,7 @@ fn into_call(param: &Expr) -> Expr {
     (|| {
         if let ast::Expr::ClosureExpr(closure) = param {
             if closure.param_list()?.params().count() == 0 {
-                Some(closure.body()?.clone())
+                Some(closure.body()?)
             } else {
                 None
             }
diff --git a/crates/ide-assists/src/handlers/replace_turbofish_with_explicit_type.rs b/crates/ide-assists/src/handlers/replace_turbofish_with_explicit_type.rs
index c177adc7a1..6626ce0795 100644
--- a/crates/ide-assists/src/handlers/replace_turbofish_with_explicit_type.rs
+++ b/crates/ide-assists/src/handlers/replace_turbofish_with_explicit_type.rs
@@ -42,7 +42,7 @@ pub(crate) fn replace_turbofish_with_explicit_type(
     let r_angle = generic_args.r_angle_token()?;
     let turbofish_range = TextRange::new(colon2.text_range().start(), r_angle.text_range().end());
 
-    let turbofish_args: Vec<GenericArg> = generic_args.generic_args().into_iter().collect();
+    let turbofish_args: Vec<GenericArg> = generic_args.generic_args().collect();
 
     // Find type of ::<_>
     if turbofish_args.len() != 1 {
diff --git a/crates/ide-assists/src/handlers/unnecessary_async.rs b/crates/ide-assists/src/handlers/unnecessary_async.rs
index 0439883225..7f612c2a14 100644
--- a/crates/ide-assists/src/handlers/unnecessary_async.rs
+++ b/crates/ide-assists/src/handlers/unnecessary_async.rs
@@ -107,7 +107,7 @@ fn find_all_references(
 /// If no await expression is found, returns None.
 fn find_await_expression(ctx: &AssistContext<'_>, nameref: &NameRef) -> Option<ast::AwaitExpr> {
     // From the nameref, walk up the tree to the await expression.
-    let await_expr = if let Some(path) = full_path_of_name_ref(&nameref) {
+    let await_expr = if let Some(path) = full_path_of_name_ref(nameref) {
         // Function calls.
         path.syntax()
             .parent()
diff --git a/crates/ide-assists/src/handlers/unqualify_method_call.rs b/crates/ide-assists/src/handlers/unqualify_method_call.rs
new file mode 100644
index 0000000000..e9d4e270cd
--- /dev/null
+++ b/crates/ide-assists/src/handlers/unqualify_method_call.rs
@@ -0,0 +1,211 @@
+use syntax::{
+    ast::{self, make, AstNode, HasArgList},
+    TextRange,
+};
+
+use crate::{AssistContext, AssistId, AssistKind, Assists};
+
+// Assist: unqualify_method_call
+//
+// Transforms universal function call syntax into a method call.
+//
+// ```
+// fn main() {
+//     std::ops::Add::add$0(1, 2);
+// }
+// # mod std { pub mod ops { pub trait Add { fn add(self, _: Self) {} } impl Add for i32 {} } }
+// ```
+// ->
+// ```
+// fn main() {
+//     1.add(2);
+// }
+// # mod std { pub mod ops { pub trait Add { fn add(self, _: Self) {} } impl Add for i32 {} } }
+// ```
+pub(crate) fn unqualify_method_call(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option<()> {
+    let call = ctx.find_node_at_offset::<ast::CallExpr>()?;
+    let ast::Expr::PathExpr(path_expr) = call.expr()? else { return None };
+    let path = path_expr.path()?;
+
+    let cursor_in_range = path.syntax().text_range().contains_range(ctx.selection_trimmed());
+    if !cursor_in_range {
+        return None;
+    }
+
+    let args = call.arg_list()?;
+    let l_paren = args.l_paren_token()?;
+    let mut args_iter = args.args();
+    let first_arg = args_iter.next()?;
+    let second_arg = args_iter.next();
+
+    _ = path.qualifier()?;
+    let method_name = path.segment()?.name_ref()?;
+
+    let res = ctx.sema.resolve_path(&path)?;
+    let hir::PathResolution::Def(hir::ModuleDef::Function(fun)) = res else { return None };
+    if !fun.has_self_param(ctx.sema.db) {
+        return None;
+    }
+
+    // `core::ops::Add::add(` -> ``
+    let delete_path =
+        TextRange::new(path.syntax().text_range().start(), l_paren.text_range().end());
+
+    // Parens around `expr` if needed
+    let parens = needs_parens_as_receiver(&first_arg).then(|| {
+        let range = first_arg.syntax().text_range();
+        (range.start(), range.end())
+    });
+
+    // `, ` -> `.add(`
+    let replace_comma = TextRange::new(
+        first_arg.syntax().text_range().end(),
+        second_arg
+            .map(|a| a.syntax().text_range().start())
+            .unwrap_or_else(|| first_arg.syntax().text_range().end()),
+    );
+
+    acc.add(
+        AssistId("unqualify_method_call", AssistKind::RefactorRewrite),
+        "Unqualify method call",
+        call.syntax().text_range(),
+        |edit| {
+            edit.delete(delete_path);
+            if let Some((open, close)) = parens {
+                edit.insert(open, "(");
+                edit.insert(close, ")");
+            }
+            edit.replace(replace_comma, format!(".{method_name}("));
+        },
+    )
+}
+
+fn needs_parens_as_receiver(expr: &ast::Expr) -> bool {
+    // Make `(expr).dummy()`
+    let dummy_call = make::expr_method_call(
+        make::expr_paren(expr.clone()),
+        make::name_ref("dummy"),
+        make::arg_list([]),
+    );
+
+    // Get the `expr` clone with the right parent back
+    // (unreachable!s are fine since we've just constructed the expression)
+    let ast::Expr::MethodCallExpr(call) = &dummy_call else { unreachable!() };
+    let Some(receiver) = call.receiver() else { unreachable!() };
+    let ast::Expr::ParenExpr(parens) = receiver else { unreachable!() };
+    let Some(expr) = parens.expr() else { unreachable!() };
+
+    expr.needs_parens_in(dummy_call.syntax().clone())
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::tests::{check_assist, check_assist_not_applicable};
+
+    use super::*;
+
+    #[test]
+    fn unqualify_method_call_simple() {
+        check_assist(
+            unqualify_method_call,
+            r#"
+struct S;
+impl S { fn f(self, S: S) {} }
+fn f() { S::$0f(S, S); }"#,
+            r#"
+struct S;
+impl S { fn f(self, S: S) {} }
+fn f() { S.f(S); }"#,
+        );
+    }
+
+    #[test]
+    fn unqualify_method_call_trait() {
+        check_assist(
+            unqualify_method_call,
+            r#"
+//- minicore: add
+fn f() { <u32 as core::ops::Add>::$0add(2, 2); }"#,
+            r#"
+fn f() { 2.add(2); }"#,
+        );
+
+        check_assist(
+            unqualify_method_call,
+            r#"
+//- minicore: add
+fn f() { core::ops::Add::$0add(2, 2); }"#,
+            r#"
+fn f() { 2.add(2); }"#,
+        );
+
+        check_assist(
+            unqualify_method_call,
+            r#"
+//- minicore: add
+use core::ops::Add;
+fn f() { <_>::$0add(2, 2); }"#,
+            r#"
+use core::ops::Add;
+fn f() { 2.add(2); }"#,
+        );
+    }
+
+    #[test]
+    fn unqualify_method_call_single_arg() {
+        check_assist(
+            unqualify_method_call,
+            r#"
+        struct S;
+        impl S { fn f(self) {} }
+        fn f() { S::$0f(S); }"#,
+            r#"
+        struct S;
+        impl S { fn f(self) {} }
+        fn f() { S.f(); }"#,
+        );
+    }
+
+    #[test]
+    fn unqualify_method_call_parens() {
+        check_assist(
+            unqualify_method_call,
+            r#"
+//- minicore: deref
+struct S;
+impl core::ops::Deref for S {
+    type Target = S;
+    fn deref(&self) -> &S { self }
+}
+fn f() { core::ops::Deref::$0deref(&S); }"#,
+            r#"
+struct S;
+impl core::ops::Deref for S {
+    type Target = S;
+    fn deref(&self) -> &S { self }
+}
+fn f() { (&S).deref(); }"#,
+        );
+    }
+
+    #[test]
+    fn unqualify_method_call_doesnt_apply_with_cursor_not_on_path() {
+        check_assist_not_applicable(
+            unqualify_method_call,
+            r#"
+//- minicore: add
+fn f() { core::ops::Add::add(2,$0 2); }"#,
+        );
+    }
+
+    #[test]
+    fn unqualify_method_call_doesnt_apply_with_no_self() {
+        check_assist_not_applicable(
+            unqualify_method_call,
+            r#"
+struct S;
+impl S { fn assoc(S: S, S: S) {} }
+fn f() { S::assoc$0(S, S); }"#,
+        );
+    }
+}
diff --git a/crates/ide-assists/src/handlers/unwrap_block.rs b/crates/ide-assists/src/handlers/unwrap_block.rs
index 7969a49182..53cdac03a3 100644
--- a/crates/ide-assists/src/handlers/unwrap_block.rs
+++ b/crates/ide-assists/src/handlers/unwrap_block.rs
@@ -37,7 +37,8 @@ pub(crate) fn unwrap_block(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option
         parent = parent.ancestors().find(|it| ast::MatchExpr::can_cast(it.kind()))?
     }
 
-    if matches!(parent.kind(), SyntaxKind::STMT_LIST | SyntaxKind::EXPR_STMT) {
+    if matches!(parent.kind(), SyntaxKind::STMT_LIST | SyntaxKind::EXPR_STMT | SyntaxKind::LET_STMT)
+    {
         return acc.add(assist_id, assist_label, target, |builder| {
             builder.replace(block.syntax().text_range(), update_expr_string(block.to_string()));
         });
@@ -713,6 +714,50 @@ fn main() -> i32 {
     return 3;
     5
 }
+"#,
+        );
+    }
+
+    #[test]
+    fn unwrap_block_in_let_initializers() {
+        // https://github.com/rust-lang/rust-analyzer/issues/13679
+        check_assist(
+            unwrap_block,
+            r#"
+fn main() {
+    let x = {$0
+        bar
+    };
+}
+"#,
+            r#"
+fn main() {
+    let x = bar;
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn unwrap_if_in_let_initializers() {
+        // https://github.com/rust-lang/rust-analyzer/issues/13679
+        check_assist(
+            unwrap_block,
+            r#"
+fn main() {
+    let a = 1;
+    let x = if a - 1 == 0 {$0
+        foo
+    } else {
+        bar
+    };
+}
+"#,
+            r#"
+fn main() {
+    let a = 1;
+    let x = foo;
+}
 "#,
         );
     }
diff --git a/crates/ide-assists/src/lib.rs b/crates/ide-assists/src/lib.rs
index 387cc63142..7813c9f9cb 100644
--- a/crates/ide-assists/src/lib.rs
+++ b/crates/ide-assists/src/lib.rs
@@ -128,6 +128,7 @@ mod handlers {
     mod convert_while_to_loop;
     mod destructure_tuple_binding;
     mod expand_glob_import;
+    mod extract_expressions_from_format_string;
     mod extract_function;
     mod extract_module;
     mod extract_struct_from_enum_variant;
@@ -138,7 +139,6 @@ mod handlers {
     mod flip_binexpr;
     mod flip_comma;
     mod flip_trait_bound;
-    mod move_format_string_arg;
     mod generate_constant;
     mod generate_default_from_enum_variant;
     mod generate_default_from_new;
@@ -159,12 +159,14 @@ mod handlers {
     mod add_return_type;
     mod inline_call;
     mod inline_local_variable;
+    mod inline_macro;
     mod inline_type_alias;
     mod introduce_named_lifetime;
     mod invert_if;
     mod merge_imports;
     mod merge_match_arms;
     mod move_bounds;
+    mod move_const_to_impl;
     mod move_guard;
     mod move_module_to_file;
     mod move_to_mod_rs;
@@ -178,12 +180,14 @@ mod handlers {
     mod remove_dbg;
     mod remove_mut;
     mod remove_unused_param;
+    mod remove_parentheses;
     mod reorder_fields;
     mod reorder_impl_items;
     mod replace_try_expr_with_match;
     mod replace_derive_with_manual_impl;
     mod replace_if_let_with_match;
     mod replace_or_with_or_else;
+    mod replace_arith_op;
     mod introduce_named_generic;
     mod replace_let_with_if_let;
     mod replace_qualified_name_with_use;
@@ -198,6 +202,7 @@ mod handlers {
     mod unnecessary_async;
     mod unwrap_block;
     mod unwrap_result_return_type;
+    mod unqualify_method_call;
     mod wrap_return_type_in_result;
 
     pub(crate) fn all() -> &'static [Handler] {
@@ -228,6 +233,7 @@ mod handlers {
             convert_while_to_loop::convert_while_to_loop,
             destructure_tuple_binding::destructure_tuple_binding,
             expand_glob_import::expand_glob_import,
+            extract_expressions_from_format_string::extract_expressions_from_format_string,
             extract_struct_from_enum_variant::extract_struct_from_enum_variant,
             extract_type_alias::extract_type_alias,
             fix_visibility::fix_visibility,
@@ -247,6 +253,7 @@ mod handlers {
             generate_from_impl_for_enum::generate_from_impl_for_enum,
             generate_function::generate_function,
             generate_impl::generate_impl,
+            generate_impl::generate_trait_impl,
             generate_is_empty_from_len::generate_is_empty_from_len,
             generate_new::generate_new,
             inline_call::inline_call,
@@ -254,13 +261,14 @@ mod handlers {
             inline_local_variable::inline_local_variable,
             inline_type_alias::inline_type_alias,
             inline_type_alias::inline_type_alias_uses,
+            inline_macro::inline_macro,
             introduce_named_generic::introduce_named_generic,
             introduce_named_lifetime::introduce_named_lifetime,
             invert_if::invert_if,
             merge_imports::merge_imports,
             merge_match_arms::merge_match_arms,
             move_bounds::move_bounds_to_where_clause,
-            move_format_string_arg::move_format_string_arg,
+            move_const_to_impl::move_const_to_impl,
             move_guard::move_arm_cond_to_match_guard,
             move_guard::move_guard_to_arm_body,
             move_module_to_file::move_module_to_file,
@@ -277,6 +285,7 @@ mod handlers {
             remove_dbg::remove_dbg,
             remove_mut::remove_mut,
             remove_unused_param::remove_unused_param,
+            remove_parentheses::remove_parentheses,
             reorder_fields::reorder_fields,
             reorder_impl_items::reorder_impl_items,
             replace_try_expr_with_match::replace_try_expr_with_match,
@@ -288,6 +297,9 @@ mod handlers {
             replace_or_with_or_else::replace_or_with_or_else,
             replace_turbofish_with_explicit_type::replace_turbofish_with_explicit_type,
             replace_qualified_name_with_use::replace_qualified_name_with_use,
+            replace_arith_op::replace_arith_with_wrapping,
+            replace_arith_op::replace_arith_with_checked,
+            replace_arith_op::replace_arith_with_saturating,
             sort_items::sort_items,
             split_import::split_import,
             toggle_ignore::toggle_ignore,
@@ -297,6 +309,7 @@ mod handlers {
             unwrap_block::unwrap_block,
             unwrap_result_return_type::unwrap_result_return_type,
             unwrap_tuple::unwrap_tuple,
+            unqualify_method_call::unqualify_method_call,
             wrap_return_type_in_result::wrap_return_type_in_result,
             // These are manually sorted for better priorities. By default,
             // priority is determined by the size of the target range (smaller
diff --git a/crates/ide-assists/src/tests.rs b/crates/ide-assists/src/tests.rs
index 92ced27c78..fca268a1f0 100644
--- a/crates/ide-assists/src/tests.rs
+++ b/crates/ide-assists/src/tests.rs
@@ -171,7 +171,7 @@ fn check(handler: Handler, before: &str, expected: ExpectedResult<'_>, assist_la
                     }
                     FileSystemEdit::MoveDir { src, src_id, dst } => {
                         // temporary placeholder for MoveDir since we are not using MoveDir in ide assists yet.
-                        (dst, format!("{:?}\n{:?}", src_id, src))
+                        (dst, format!("{src_id:?}\n{src:?}"))
                     }
                 };
                 let sr = db.file_source_root(dst.anchor);
diff --git a/crates/ide-assists/src/tests/generated.rs b/crates/ide-assists/src/tests/generated.rs
index c09317572a..006ae4b303 100644
--- a/crates/ide-assists/src/tests/generated.rs
+++ b/crates/ide-assists/src/tests/generated.rs
@@ -624,6 +624,37 @@ fn qux(bar: Bar, baz: Baz) {}
     )
 }
 
+#[test]
+fn doctest_extract_expressions_from_format_string() {
+    check_doc_test(
+        "extract_expressions_from_format_string",
+        r#####"
+macro_rules! format_args {
+    ($lit:literal $(tt:tt)*) => { 0 },
+}
+macro_rules! print {
+    ($($arg:tt)*) => (std::io::_print(format_args!($($arg)*)));
+}
+
+fn main() {
+    print!("{var} {x + 1}$0");
+}
+"#####,
+        r#####"
+macro_rules! format_args {
+    ($lit:literal $(tt:tt)*) => { 0 },
+}
+macro_rules! print {
+    ($($arg:tt)*) => (std::io::_print(format_args!($($arg)*)));
+}
+
+fn main() {
+    print!("{var} {}"$0, x + 1);
+}
+"#####,
+    )
+}
+
 #[test]
 fn doctest_extract_function() {
     check_doc_test(
@@ -1249,8 +1280,8 @@ fn doctest_generate_impl() {
     check_doc_test(
         "generate_impl",
         r#####"
-struct Ctx<T: Clone> {
-    data: T,$0
+struct Ctx$0<T: Clone> {
+    data: T,
 }
 "#####,
         r#####"
@@ -1341,6 +1372,27 @@ impl Person {
     )
 }
 
+#[test]
+fn doctest_generate_trait_impl() {
+    check_doc_test(
+        "generate_trait_impl",
+        r#####"
+struct $0Ctx<T: Clone> {
+    data: T,
+}
+"#####,
+        r#####"
+struct Ctx<T: Clone> {
+    data: T,
+}
+
+impl<T: Clone> $0 for Ctx<T> {
+
+}
+"#####,
+    )
+}
+
 #[test]
 fn doctest_inline_call() {
     check_doc_test(
@@ -1417,6 +1469,39 @@ fn main() {
     )
 }
 
+#[test]
+fn doctest_inline_macro() {
+    check_doc_test(
+        "inline_macro",
+        r#####"
+macro_rules! num {
+    (+$($t:tt)+) => (1 + num!($($t )+));
+    (-$($t:tt)+) => (-1 + num!($($t )+));
+    (+) => (1);
+    (-) => (-1);
+}
+
+fn main() {
+    let number = num$0!(+ + + - + +);
+    println!("{number}");
+}
+"#####,
+        r#####"
+macro_rules! num {
+    (+$($t:tt)+) => (1 + num!($($t )+));
+    (-$($t:tt)+) => (-1 + num!($($t )+));
+    (+) => (1);
+    (-) => (-1);
+}
+
+fn main() {
+    let number = 1+num!(+ + - + +);
+    println!("{number}");
+}
+"#####,
+    )
+}
+
 #[test]
 fn doctest_inline_type_alias() {
     check_doc_test(
@@ -1654,31 +1739,29 @@ fn apply<T, U, F>(f: F, x: T) -> U where F: FnOnce(T) -> U {
 }
 
 #[test]
-fn doctest_move_format_string_arg() {
+fn doctest_move_const_to_impl() {
     check_doc_test(
-        "move_format_string_arg",
+        "move_const_to_impl",
         r#####"
-macro_rules! format_args {
-    ($lit:literal $(tt:tt)*) => { 0 },
-}
-macro_rules! print {
-    ($($arg:tt)*) => (std::io::_print(format_args!($($arg)*)));
-}
+struct S;
+impl S {
+    fn foo() -> usize {
+        /// The answer.
+        const C$0: usize = 42;
 
-fn main() {
-    print!("{x + 1}$0");
+        C * C
+    }
 }
 "#####,
         r#####"
-macro_rules! format_args {
-    ($lit:literal $(tt:tt)*) => { 0 },
-}
-macro_rules! print {
-    ($($arg:tt)*) => (std::io::_print(format_args!($($arg)*)));
-}
+struct S;
+impl S {
+    /// The answer.
+    const C: usize = 42;
 
-fn main() {
-    print!("{}"$0, x + 1);
+    fn foo() -> usize {
+        Self::C * Self::C
+    }
 }
 "#####,
     )
@@ -1928,6 +2011,23 @@ impl Walrus {
     )
 }
 
+#[test]
+fn doctest_remove_parentheses() {
+    check_doc_test(
+        "remove_parentheses",
+        r#####"
+fn main() {
+    _ = $0(2) + 2;
+}
+"#####,
+        r#####"
+fn main() {
+    _ = 2 + 2;
+}
+"#####,
+    )
+}
+
 #[test]
 fn doctest_remove_unused_param() {
     check_doc_test(
@@ -1999,6 +2099,57 @@ impl Foo for Bar {
     )
 }
 
+#[test]
+fn doctest_replace_arith_with_checked() {
+    check_doc_test(
+        "replace_arith_with_checked",
+        r#####"
+fn main() {
+  let x = 1 $0+ 2;
+}
+"#####,
+        r#####"
+fn main() {
+  let x = 1.checked_add(2);
+}
+"#####,
+    )
+}
+
+#[test]
+fn doctest_replace_arith_with_saturating() {
+    check_doc_test(
+        "replace_arith_with_saturating",
+        r#####"
+fn main() {
+  let x = 1 $0+ 2;
+}
+"#####,
+        r#####"
+fn main() {
+  let x = 1.saturating_add(2);
+}
+"#####,
+    )
+}
+
+#[test]
+fn doctest_replace_arith_with_wrapping() {
+    check_doc_test(
+        "replace_arith_with_wrapping",
+        r#####"
+fn main() {
+  let x = 1 $0+ 2;
+}
+"#####,
+        r#####"
+fn main() {
+  let x = 1.wrapping_add(2);
+}
+"#####,
+    )
+}
+
 #[test]
 fn doctest_replace_char_with_string() {
     check_doc_test(
@@ -2415,6 +2566,25 @@ pub async fn bar() { foo() }
     )
 }
 
+#[test]
+fn doctest_unqualify_method_call() {
+    check_doc_test(
+        "unqualify_method_call",
+        r#####"
+fn main() {
+    std::ops::Add::add$0(1, 2);
+}
+mod std { pub mod ops { pub trait Add { fn add(self, _: Self) {} } impl Add for i32 {} } }
+"#####,
+        r#####"
+fn main() {
+    1.add(2);
+}
+mod std { pub mod ops { pub trait Add { fn add(self, _: Self) {} } impl Add for i32 {} } }
+"#####,
+    )
+}
+
 #[test]
 fn doctest_unwrap_block() {
     check_doc_test(
diff --git a/crates/ide-assists/src/tests/sourcegen.rs b/crates/ide-assists/src/tests/sourcegen.rs
index 070b83d3c1..b4f50c7fb2 100644
--- a/crates/ide-assists/src/tests/sourcegen.rs
+++ b/crates/ide-assists/src/tests/sourcegen.rs
@@ -18,7 +18,7 @@ use super::check_doc_test;
         for assist in assists.iter() {
             for (idx, section) in assist.sections.iter().enumerate() {
                 let test_id =
-                    if idx == 0 { assist.id.clone() } else { format!("{}_{}", &assist.id, idx) };
+                    if idx == 0 { assist.id.clone() } else { format!("{}_{idx}", &assist.id) };
                 let test = format!(
                     r######"
 #[test]
@@ -95,8 +95,7 @@ impl Assist {
                 let id = block.id;
                 assert!(
                     id.chars().all(|it| it.is_ascii_lowercase() || it == '_'),
-                    "invalid assist id: {:?}",
-                    id
+                    "invalid assist id: {id:?}"
                 );
                 let mut lines = block.contents.iter().peekable();
                 let location = sourcegen::Location { file: path.to_path_buf(), line: block.line };
@@ -175,7 +174,7 @@ impl fmt::Display for Assist {
 fn hide_hash_comments(text: &str) -> String {
     text.split('\n') // want final newline
         .filter(|&it| !(it.starts_with("# ") || it == "#"))
-        .map(|it| format!("{}\n", it))
+        .map(|it| format!("{it}\n"))
         .collect()
 }
 
@@ -190,6 +189,6 @@ fn reveal_hash_comments(text: &str) -> String {
                 it
             }
         })
-        .map(|it| format!("{}\n", it))
+        .map(|it| format!("{it}\n"))
         .collect()
 }
diff --git a/crates/ide-assists/src/utils.rs b/crates/ide-assists/src/utils.rs
index 68c31b4f8e..7add660649 100644
--- a/crates/ide-assists/src/utils.rs
+++ b/crates/ide-assists/src/utils.rs
@@ -208,6 +208,23 @@ pub(crate) fn render_snippet(_cap: SnippetCap, node: &SyntaxNode, cursor: Cursor
     }
 }
 
+/// Escapes text that should be rendered as-is, typically those that we're copy-pasting what the
+/// users wrote.
+///
+/// This function should only be used when the text doesn't contain snippet **AND** the text
+/// wouldn't be included in a snippet.
+pub(crate) fn escape_non_snippet(text: &mut String) {
+    // While we *can* escape `}`, we don't really have to in this specific case. We only need to
+    // escape it inside `${}` to disambiguate it from the ending token of the syntax, but after we
+    // escape every occurrence of `$`, we wouldn't have `${}` in the first place.
+    //
+    // This will break if the text contains snippet or it will be included in a snippet (hence doc
+    // comment). Compare `fn escape(buf)` in `render_snippet()` above, where the escaped text is
+    // included in a snippet.
+    stdx::replace(text, '\\', r"\\");
+    stdx::replace(text, '$', r"\$");
+}
+
 pub(crate) fn vis_offset(node: &SyntaxNode) -> TextSize {
     node.children_with_tokens()
         .find(|it| !matches!(it.kind(), WHITESPACE | COMMENT | ATTR))
@@ -417,35 +434,67 @@ pub(crate) fn find_impl_block_end(impl_def: ast::Impl, buf: &mut String) -> Opti
     Some(end)
 }
 
-// Generates the surrounding `impl Type { <code> }` including type and lifetime
-// parameters
+/// Generates the surrounding `impl Type { <code> }` including type and lifetime
+/// parameters.
 pub(crate) fn generate_impl_text(adt: &ast::Adt, code: &str) -> String {
-    generate_impl_text_inner(adt, None, code)
+    generate_impl_text_inner(adt, None, true, code)
 }
 
-// Generates the surrounding `impl <trait> for Type { <code> }` including type
-// and lifetime parameters
+/// Generates the surrounding `impl <trait> for Type { <code> }` including type
+/// and lifetime parameters, with `<trait>` appended to `impl`'s generic parameters' bounds.
+///
+/// This is useful for traits like `PartialEq`, since `impl<T> PartialEq for U<T>` often requires `T: PartialEq`.
 pub(crate) fn generate_trait_impl_text(adt: &ast::Adt, trait_text: &str, code: &str) -> String {
-    generate_impl_text_inner(adt, Some(trait_text), code)
+    generate_impl_text_inner(adt, Some(trait_text), true, code)
 }
 
-fn generate_impl_text_inner(adt: &ast::Adt, trait_text: Option<&str>, code: &str) -> String {
+/// Generates the surrounding `impl <trait> for Type { <code> }` including type
+/// and lifetime parameters, with `impl`'s generic parameters' bounds kept as-is.
+///
+/// This is useful for traits like `From<T>`, since `impl<T> From<T> for U<T>` doesn't require `T: From<T>`.
+pub(crate) fn generate_trait_impl_text_intransitive(
+    adt: &ast::Adt,
+    trait_text: &str,
+    code: &str,
+) -> String {
+    generate_impl_text_inner(adt, Some(trait_text), false, code)
+}
+
+fn generate_impl_text_inner(
+    adt: &ast::Adt,
+    trait_text: Option<&str>,
+    trait_is_transitive: bool,
+    code: &str,
+) -> String {
     // Ensure lifetime params are before type & const params
     let generic_params = adt.generic_param_list().map(|generic_params| {
         let lifetime_params =
             generic_params.lifetime_params().map(ast::GenericParam::LifetimeParam);
-        let ty_or_const_params = generic_params.type_or_const_params().filter_map(|param| {
-            // remove defaults since they can't be specified in impls
+        let ty_or_const_params = generic_params.type_or_const_params().map(|param| {
             match param {
                 ast::TypeOrConstParam::Type(param) => {
                     let param = param.clone_for_update();
+                    // remove defaults since they can't be specified in impls
                     param.remove_default();
-                    Some(ast::GenericParam::TypeParam(param))
+                    let mut bounds =
+                        param.type_bound_list().map_or_else(Vec::new, |it| it.bounds().collect());
+                    if let Some(trait_) = trait_text {
+                        // Add the current trait to `bounds` if the trait is transitive,
+                        // meaning `impl<T> Trait for U<T>` requires `T: Trait`.
+                        if trait_is_transitive {
+                            bounds.push(make::type_bound(trait_));
+                        }
+                    };
+                    // `{ty_param}: {bounds}`
+                    let param =
+                        make::type_param(param.name().unwrap(), make::type_bound_list(bounds));
+                    ast::GenericParam::TypeParam(param)
                 }
                 ast::TypeOrConstParam::Const(param) => {
                     let param = param.clone_for_update();
+                    // remove defaults since they can't be specified in impls
                     param.remove_default();
-                    Some(ast::GenericParam::ConstParam(param))
+                    ast::GenericParam::ConstParam(param)
                 }
             }
         });
@@ -596,7 +645,7 @@ pub(crate) fn convert_reference_type(
 }
 
 fn handle_copy(ty: &hir::Type, db: &dyn HirDatabase) -> Option<ReferenceConversionType> {
-    ty.is_copy(db).then(|| ReferenceConversionType::Copy)
+    ty.is_copy(db).then_some(ReferenceConversionType::Copy)
 }
 
 fn handle_as_ref_str(
@@ -607,7 +656,7 @@ fn handle_as_ref_str(
     let str_type = hir::BuiltinType::str().ty(db);
 
     ty.impls_trait(db, famous_defs.core_convert_AsRef()?, &[str_type])
-        .then(|| ReferenceConversionType::AsRefStr)
+        .then_some(ReferenceConversionType::AsRefStr)
 }
 
 fn handle_as_ref_slice(
@@ -619,7 +668,7 @@ fn handle_as_ref_slice(
     let slice_type = hir::Type::new_slice(type_argument);
 
     ty.impls_trait(db, famous_defs.core_convert_AsRef()?, &[slice_type])
-        .then(|| ReferenceConversionType::AsRefSlice)
+        .then_some(ReferenceConversionType::AsRefSlice)
 }
 
 fn handle_dereferenced(
@@ -630,7 +679,7 @@ fn handle_dereferenced(
     let type_argument = ty.type_arguments().next()?;
 
     ty.impls_trait(db, famous_defs.core_convert_AsRef()?, &[type_argument])
-        .then(|| ReferenceConversionType::Dereferenced)
+        .then_some(ReferenceConversionType::Dereferenced)
 }
 
 fn handle_option_as_ref(
diff --git a/crates/ide-assists/src/utils/gen_trait_fn_body.rs b/crates/ide-assists/src/utils/gen_trait_fn_body.rs
index 6c87e66c13..d4abb51259 100644
--- a/crates/ide-assists/src/utils/gen_trait_fn_body.rs
+++ b/crates/ide-assists/src/utils/gen_trait_fn_body.rs
@@ -419,7 +419,7 @@ fn gen_partial_eq(adt: &ast::Adt, func: &ast::Fn) -> Option<()> {
         make::ext::path_from_idents(["Self", &variant.name()?.to_string()])
     }
 
-    fn gen_tuple_field(field_name: &String) -> ast::Pat {
+    fn gen_tuple_field(field_name: &str) -> ast::Pat {
         ast::Pat::IdentPat(make::ident_pat(false, false, make::name(field_name)))
     }
 
@@ -516,10 +516,18 @@ fn gen_partial_eq(adt: &ast::Adt, func: &ast::Fn) -> Option<()> {
 
             let expr = match arms.len() {
                 0 => eq_check,
-                _ => {
-                    if n_cases > arms.len() {
+                arms_len => {
+                    // Generate the fallback arm when this enum has >1 variants.
+                    // The fallback arm will be `_ => false,` if we've already gone through every case where the variants of self and other match,
+                    // and `_ => std::mem::discriminant(self) == std::mem::discriminant(other),` otherwise.
+                    if n_cases > 1 {
                         let lhs = make::wildcard_pat().into();
-                        arms.push(make::match_arm(Some(lhs), None, eq_check));
+                        let rhs = if arms_len == n_cases {
+                            make::expr_literal("false").into()
+                        } else {
+                            eq_check
+                        };
+                        arms.push(make::match_arm(Some(lhs), None, rhs));
                     }
 
                     let match_target = make::expr_tuple(vec![lhs_name, rhs_name]);
diff --git a/crates/ide-completion/src/completions.rs b/crates/ide-completion/src/completions.rs
index 296dfc1425..eb87d6c582 100644
--- a/crates/ide-completion/src/completions.rs
+++ b/crates/ide-completion/src/completions.rs
@@ -133,7 +133,7 @@ impl Completions {
                 if incomplete_let && snippet.ends_with('}') {
                     // complete block expression snippets with a trailing semicolon, if inside an incomplete let
                     cov_mark::hit!(let_semi);
-                    item.insert_snippet(cap, format!("{};", snippet));
+                    item.insert_snippet(cap, format!("{snippet};"));
                 } else {
                     item.insert_snippet(cap, snippet);
                 }
@@ -494,7 +494,7 @@ impl Completions {
             pattern_ctx,
             path_ctx,
             variant,
-            local_name.clone(),
+            local_name,
             None,
         ));
     }
diff --git a/crates/ide-completion/src/completions/attribute.rs b/crates/ide-completion/src/completions/attribute.rs
index d9fe94cb44..bb950c76f8 100644
--- a/crates/ide-completion/src/completions/attribute.rs
+++ b/crates/ide-completion/src/completions/attribute.rs
@@ -357,7 +357,7 @@ fn parse_comma_sep_expr(input: ast::TokenTree) -> Option<Vec<ast::Expr>> {
     Some(
         input_expressions
             .into_iter()
-            .filter_map(|(is_sep, group)| (!is_sep).then(|| group))
+            .filter_map(|(is_sep, group)| (!is_sep).then_some(group))
             .filter_map(|mut tokens| syntax::hacks::parse_expr_from_str(&tokens.join("")))
             .collect::<Vec<ast::Expr>>(),
     )
@@ -371,9 +371,7 @@ fn attributes_are_sorted() {
     attrs.for_each(|next| {
         assert!(
             prev < next,
-            r#"ATTRIBUTES array is not sorted, "{}" should come after "{}""#,
-            prev,
-            next
+            r#"ATTRIBUTES array is not sorted, "{prev}" should come after "{next}""#
         );
         prev = next;
     });
diff --git a/crates/ide-completion/src/completions/attribute/cfg.rs b/crates/ide-completion/src/completions/attribute/cfg.rs
index 311060143b..7ef4ff30b5 100644
--- a/crates/ide-completion/src/completions/attribute/cfg.rs
+++ b/crates/ide-completion/src/completions/attribute/cfg.rs
@@ -11,7 +11,7 @@ use crate::{completions::Completions, context::CompletionContext, CompletionItem
 pub(crate) fn complete_cfg(acc: &mut Completions, ctx: &CompletionContext<'_>) {
     let add_completion = |item: &str| {
         let mut completion = CompletionItem::new(SymbolKind::BuiltinAttr, ctx.source_range(), item);
-        completion.insert_text(format!(r#""{}""#, item));
+        completion.insert_text(format!(r#""{item}""#));
         acc.add(completion.build());
     };
 
@@ -29,7 +29,7 @@ pub(crate) fn complete_cfg(acc: &mut Completions, ctx: &CompletionContext<'_>) {
         Some("target_vendor") => KNOWN_VENDOR.iter().copied().for_each(add_completion),
         Some("target_endian") => ["little", "big"].into_iter().for_each(add_completion),
         Some(name) => ctx.krate.potential_cfg(ctx.db).get_cfg_values(name).cloned().for_each(|s| {
-            let insert_text = format!(r#""{}""#, s);
+            let insert_text = format!(r#""{s}""#);
             let mut item = CompletionItem::new(SymbolKind::BuiltinAttr, ctx.source_range(), s);
             item.insert_text(insert_text);
 
diff --git a/crates/ide-completion/src/completions/attribute/lint.rs b/crates/ide-completion/src/completions/attribute/lint.rs
index 967f6ddd9a..818c3cfd5f 100644
--- a/crates/ide-completion/src/completions/attribute/lint.rs
+++ b/crates/ide-completion/src/completions/attribute/lint.rs
@@ -51,7 +51,7 @@ pub(super) fn complete_lint(
             continue;
         }
         let label = match qual {
-            Some(qual) if !is_qualified => format!("{}::{}", qual, name),
+            Some(qual) if !is_qualified => format!("{qual}::{name}"),
             _ => name.to_owned(),
         };
         let mut item = CompletionItem::new(SymbolKind::Attribute, ctx.source_range(), label);
diff --git a/crates/ide-completion/src/completions/dot.rs b/crates/ide-completion/src/completions/dot.rs
index 02004ff7b6..7c6e5e100f 100644
--- a/crates/ide-completion/src/completions/dot.rs
+++ b/crates/ide-completion/src/completions/dot.rs
@@ -32,12 +32,12 @@ pub(crate) fn complete_dot(
         complete_fields(
             acc,
             ctx,
-            &receiver_ty,
+            receiver_ty,
             |acc, field, ty| acc.add_field(ctx, dot_access, None, field, &ty),
             |acc, field, ty| acc.add_tuple_field(ctx, None, field, &ty),
         );
     }
-    complete_methods(ctx, &receiver_ty, |func| acc.add_method(ctx, dot_access, func, None, None));
+    complete_methods(ctx, receiver_ty, |func| acc.add_method(ctx, dot_access, func, None, None));
 }
 
 pub(crate) fn complete_undotted_self(
diff --git a/crates/ide-completion/src/completions/env_vars.rs b/crates/ide-completion/src/completions/env_vars.rs
index 09e95e53de..1002be2113 100644
--- a/crates/ide-completion/src/completions/env_vars.rs
+++ b/crates/ide-completion/src/completions/env_vars.rs
@@ -68,28 +68,26 @@ mod tests {
             &format!(
                 r#"
             #[rustc_builtin_macro]
-            macro_rules! {} {{
+            macro_rules! {macro_name} {{
                 ($var:literal) => {{ 0 }}
             }}
 
             fn main() {{
-                let foo = {}!("CAR$0");
+                let foo = {macro_name}!("CAR$0");
             }}
-        "#,
-                macro_name, macro_name
+        "#
             ),
             &format!(
                 r#"
             #[rustc_builtin_macro]
-            macro_rules! {} {{
+            macro_rules! {macro_name} {{
                 ($var:literal) => {{ 0 }}
             }}
 
             fn main() {{
-                let foo = {}!("CARGO_BIN_NAME");
+                let foo = {macro_name}!("CARGO_BIN_NAME");
             }}
-        "#,
-                macro_name, macro_name
+        "#
             ),
         );
     }
@@ -112,7 +110,7 @@ mod tests {
         "#;
 
         let completions = completion_list(fixture);
-        assert!(completions.is_empty(), "Completions weren't empty: {}", completions);
+        assert!(completions.is_empty(), "Completions weren't empty: {completions}");
     }
 
     #[test]
@@ -129,7 +127,7 @@ mod tests {
         "#;
 
         let completions = completion_list(fixture);
-        assert!(completions.is_empty(), "Completions weren't empty: {}", completions);
+        assert!(completions.is_empty(), "Completions weren't empty: {completions}");
     }
 
     #[test]
@@ -145,6 +143,6 @@ mod tests {
         "#;
 
         let completions = completion_list(fixture);
-        assert!(completions.is_empty(), "Completions weren't empty: {}", completions)
+        assert!(completions.is_empty(), "Completions weren't empty: {completions}")
     }
 }
diff --git a/crates/ide-completion/src/completions/expr.rs b/crates/ide-completion/src/completions/expr.rs
index 3192b21cfb..cfe4787f73 100644
--- a/crates/ide-completion/src/completions/expr.rs
+++ b/crates/ide-completion/src/completions/expr.rs
@@ -64,7 +64,7 @@ pub(crate) fn complete_expr_path(
                 acc.add_enum_variants(ctx, path_ctx, e);
             }
 
-            ctx.iterate_path_candidates(&ty, |item| {
+            ctx.iterate_path_candidates(ty, |item| {
                 add_assoc_item(acc, item);
             });
 
diff --git a/crates/ide-completion/src/completions/fn_param.rs b/crates/ide-completion/src/completions/fn_param.rs
index f0ecc595af..d8b8a190eb 100644
--- a/crates/ide-completion/src/completions/fn_param.rs
+++ b/crates/ide-completion/src/completions/fn_param.rs
@@ -192,5 +192,5 @@ fn comma_wrapper(ctx: &CompletionContext<'_>) -> Option<(impl Fn(&str) -> String
         matches!(prev_token_kind, SyntaxKind::COMMA | SyntaxKind::L_PAREN | SyntaxKind::PIPE);
     let leading = if has_leading_comma { "" } else { ", " };
 
-    Some((move |label: &_| (format!("{}{}{}", leading, label, trailing)), param.text_range()))
+    Some((move |label: &_| (format!("{leading}{label}{trailing}")), param.text_range()))
 }
diff --git a/crates/ide-completion/src/completions/format_string.rs b/crates/ide-completion/src/completions/format_string.rs
index 038bdb4279..5c46c5806e 100644
--- a/crates/ide-completion/src/completions/format_string.rs
+++ b/crates/ide-completion/src/completions/format_string.rs
@@ -13,7 +13,7 @@ pub(crate) fn format_string(
     original: &ast::String,
     expanded: &ast::String,
 ) {
-    if !is_format_string(&expanded) {
+    if !is_format_string(expanded) {
         return;
     }
     let cursor = ctx.position.offset;
diff --git a/crates/ide-completion/src/completions/item_list/trait_impl.rs b/crates/ide-completion/src/completions/item_list/trait_impl.rs
index 7384a3f2d8..9a060857e9 100644
--- a/crates/ide-completion/src/completions/item_list/trait_impl.rs
+++ b/crates/ide-completion/src/completions/item_list/trait_impl.rs
@@ -37,7 +37,7 @@ use ide_db::{
     traits::get_missing_assoc_items, SymbolKind,
 };
 use syntax::{
-    ast::{self, edit_in_place::AttrsOwnerEdit},
+    ast::{self, edit_in_place::AttrsOwnerEdit, HasTypeBounds},
     AstNode, SyntaxElement, SyntaxKind, TextRange, T,
 };
 use text_edit::TextEdit;
@@ -190,7 +190,7 @@ fn add_function_impl(
     };
 
     let mut item = CompletionItem::new(completion_kind, replacement_range, label);
-    item.lookup_by(format!("fn {}", fn_name))
+    item.lookup_by(format!("fn {fn_name}"))
         .set_documentation(func.docs(ctx.db))
         .set_relevance(CompletionRelevance { is_item_from_trait: true, ..Default::default() });
 
@@ -205,11 +205,11 @@ fn add_function_impl(
             let function_decl = function_declaration(&transformed_fn, source.file_id.is_macro());
             match ctx.config.snippet_cap {
                 Some(cap) => {
-                    let snippet = format!("{} {{\n    $0\n}}", function_decl);
+                    let snippet = format!("{function_decl} {{\n    $0\n}}");
                     item.snippet_edit(cap, TextEdit::replace(replacement_range, snippet));
                 }
                 None => {
-                    let header = format!("{} {{", function_decl);
+                    let header = format!("{function_decl} {{");
                     item.text_edit(TextEdit::replace(replacement_range, header));
                 }
             };
@@ -249,10 +249,10 @@ fn add_type_alias_impl(
 ) {
     let alias_name = type_alias.name(ctx.db).unescaped().to_smol_str();
 
-    let label = format!("type {} =", alias_name);
+    let label = format!("type {alias_name} =");
 
     let mut item = CompletionItem::new(SymbolKind::TypeAlias, replacement_range, label);
-    item.lookup_by(format!("type {}", alias_name))
+    item.lookup_by(format!("type {alias_name}"))
         .set_documentation(type_alias.docs(ctx.db))
         .set_relevance(CompletionRelevance { is_item_from_trait: true, ..Default::default() });
 
@@ -265,10 +265,21 @@ fn add_type_alias_impl(
             };
 
             let start = transformed_ty.syntax().text_range().start();
-            let Some(end) = transformed_ty
-                .eq_token()
-                .map(|tok| tok.text_range().start())
-                .or(transformed_ty.semicolon_token().map(|tok| tok.text_range().start())) else { return };
+
+            let end = if let Some(end) =
+                transformed_ty.colon_token().map(|tok| tok.text_range().start())
+            {
+                end
+            } else if let Some(end) = transformed_ty.eq_token().map(|tok| tok.text_range().start())
+            {
+                end
+            } else if let Some(end) =
+                transformed_ty.semicolon_token().map(|tok| tok.text_range().start())
+            {
+                end
+            } else {
+                return;
+            };
 
             let len = end - start;
             let mut decl = transformed_ty.syntax().text().slice(..len).to_string();
@@ -279,7 +290,7 @@ fn add_type_alias_impl(
 
             match ctx.config.snippet_cap {
                 Some(cap) => {
-                    let snippet = format!("{}$0;", decl);
+                    let snippet = format!("{decl}$0;");
                     item.snippet_edit(cap, TextEdit::replace(replacement_range, snippet));
                 }
                 None => {
@@ -310,10 +321,10 @@ fn add_const_impl(
                 };
 
                 let label = make_const_compl_syntax(&transformed_const, source.file_id.is_macro());
-                let replacement = format!("{} ", label);
+                let replacement = format!("{label} ");
 
                 let mut item = CompletionItem::new(SymbolKind::Const, replacement_range, label);
-                item.lookup_by(format!("const {}", const_name))
+                item.lookup_by(format!("const {const_name}"))
                     .set_documentation(const_.docs(ctx.db))
                     .set_relevance(CompletionRelevance {
                         is_item_from_trait: true,
@@ -322,7 +333,7 @@ fn add_const_impl(
                 match ctx.config.snippet_cap {
                     Some(cap) => item.snippet_edit(
                         cap,
-                        TextEdit::replace(replacement_range, format!("{}$0;", replacement)),
+                        TextEdit::replace(replacement_range, format!("{replacement}$0;")),
                     ),
                     None => item.text_edit(TextEdit::replace(replacement_range, replacement)),
                 };
@@ -834,11 +845,10 @@ trait Test {{
 struct T;
 
 impl Test for T {{
-    {}
-    {}
+    {hint}
+    {next_sibling}
 }}
-"#,
-                    hint, next_sibling
+"#
                 ),
                 &format!(
                     r#"
@@ -850,11 +860,10 @@ trait Test {{
 struct T;
 
 impl Test for T {{
-    {}
-    {}
+    {completed}
+    {next_sibling}
 }}
-"#,
-                    completed, next_sibling
+"#
                 ),
             )
         };
@@ -894,10 +903,9 @@ struct T;
 impl Foo for T {{
     // Comment
     #[bar]
-    {}
+    {hint}
 }}
-"#,
-                    hint
+"#
                 ),
                 &format!(
                     r#"
@@ -911,10 +919,9 @@ struct T;
 impl Foo for T {{
     // Comment
     #[bar]
-    {}
+    {completed}
 }}
-"#,
-                    completed
+"#
                 ),
             )
         };
diff --git a/crates/ide-completion/src/completions/postfix.rs b/crates/ide-completion/src/completions/postfix.rs
index b9bd47f7da..f4f37d77d8 100644
--- a/crates/ide-completion/src/completions/postfix.rs
+++ b/crates/ide-completion/src/completions/postfix.rs
@@ -5,7 +5,7 @@ mod format_like;
 use hir::{Documentation, HasAttrs};
 use ide_db::{imports::insert_use::ImportScope, ty_filter::TryEnum, SnippetCap};
 use syntax::{
-    ast::{self, AstNode, AstToken},
+    ast::{self, make, AstNode, AstToken},
     SyntaxKind::{EXPR_STMT, STMT_LIST},
     TextRange, TextSize,
 };
@@ -61,7 +61,7 @@ pub(crate) fn complete_postfix(
                 let mut item = postfix_snippet(
                     "drop",
                     "fn drop(&mut self)",
-                    &format!("drop($0{})", receiver_text),
+                    &format!("drop($0{receiver_text})"),
                 );
                 item.set_documentation(drop_fn.docs(ctx.db));
                 item.add_to(acc);
@@ -76,14 +76,14 @@ pub(crate) fn complete_postfix(
                 postfix_snippet(
                     "ifl",
                     "if let Ok {}",
-                    &format!("if let Ok($1) = {} {{\n    $0\n}}", receiver_text),
+                    &format!("if let Ok($1) = {receiver_text} {{\n    $0\n}}"),
                 )
                 .add_to(acc);
 
                 postfix_snippet(
                     "while",
                     "while let Ok {}",
-                    &format!("while let Ok($1) = {} {{\n    $0\n}}", receiver_text),
+                    &format!("while let Ok($1) = {receiver_text} {{\n    $0\n}}"),
                 )
                 .add_to(acc);
             }
@@ -91,46 +91,44 @@ pub(crate) fn complete_postfix(
                 postfix_snippet(
                     "ifl",
                     "if let Some {}",
-                    &format!("if let Some($1) = {} {{\n    $0\n}}", receiver_text),
+                    &format!("if let Some($1) = {receiver_text} {{\n    $0\n}}"),
                 )
                 .add_to(acc);
 
                 postfix_snippet(
                     "while",
                     "while let Some {}",
-                    &format!("while let Some($1) = {} {{\n    $0\n}}", receiver_text),
+                    &format!("while let Some($1) = {receiver_text} {{\n    $0\n}}"),
                 )
                 .add_to(acc);
             }
         }
     } else if receiver_ty.is_bool() || receiver_ty.is_unknown() {
-        postfix_snippet("if", "if expr {}", &format!("if {} {{\n    $0\n}}", receiver_text))
+        postfix_snippet("if", "if expr {}", &format!("if {receiver_text} {{\n    $0\n}}"))
             .add_to(acc);
-        postfix_snippet(
-            "while",
-            "while expr {}",
-            &format!("while {} {{\n    $0\n}}", receiver_text),
-        )
-        .add_to(acc);
-        postfix_snippet("not", "!expr", &format!("!{}", receiver_text)).add_to(acc);
+        postfix_snippet("while", "while expr {}", &format!("while {receiver_text} {{\n    $0\n}}"))
+            .add_to(acc);
+        postfix_snippet("not", "!expr", &format!("!{receiver_text}")).add_to(acc);
     } else if let Some(trait_) = ctx.famous_defs().core_iter_IntoIterator() {
         if receiver_ty.impls_trait(ctx.db, trait_, &[]) {
             postfix_snippet(
                 "for",
                 "for ele in expr {}",
-                &format!("for ele in {} {{\n    $0\n}}", receiver_text),
+                &format!("for ele in {receiver_text} {{\n    $0\n}}"),
             )
             .add_to(acc);
         }
     }
 
-    postfix_snippet("ref", "&expr", &format!("&{}", receiver_text)).add_to(acc);
-    postfix_snippet("refm", "&mut expr", &format!("&mut {}", receiver_text)).add_to(acc);
+    postfix_snippet("ref", "&expr", &format!("&{receiver_text}")).add_to(acc);
+    postfix_snippet("refm", "&mut expr", &format!("&mut {receiver_text}")).add_to(acc);
 
     // The rest of the postfix completions create an expression that moves an argument,
     // so it's better to consider references now to avoid breaking the compilation
-    let dot_receiver = include_references(dot_receiver);
-    let receiver_text = get_receiver_text(&dot_receiver, receiver_is_ambiguous_float_literal);
+
+    let (dot_receiver, node_to_replace_with) = include_references(dot_receiver);
+    let receiver_text =
+        get_receiver_text(&node_to_replace_with, receiver_is_ambiguous_float_literal);
     let postfix_snippet = match build_postfix_snippet_builder(ctx, cap, &dot_receiver) {
         Some(it) => it,
         None => return,
@@ -146,7 +144,7 @@ pub(crate) fn complete_postfix(
                 postfix_snippet(
                     "match",
                     "match expr {}",
-                    &format!("match {} {{\n    Ok(${{1:_}}) => {{$2}},\n    Err(${{3:_}}) => {{$0}},\n}}", receiver_text),
+                    &format!("match {receiver_text} {{\n    Ok(${{1:_}}) => {{$2}},\n    Err(${{3:_}}) => {{$0}},\n}}"),
                 )
                 .add_to(acc);
             }
@@ -155,8 +153,7 @@ pub(crate) fn complete_postfix(
                     "match",
                     "match expr {}",
                     &format!(
-                        "match {} {{\n    Some(${{1:_}}) => {{$2}},\n    None => {{$0}},\n}}",
-                        receiver_text
+                        "match {receiver_text} {{\n    Some(${{1:_}}) => {{$2}},\n    None => {{$0}},\n}}"
                     ),
                 )
                 .add_to(acc);
@@ -166,21 +163,21 @@ pub(crate) fn complete_postfix(
             postfix_snippet(
                 "match",
                 "match expr {}",
-                &format!("match {} {{\n    ${{1:_}} => {{$0}},\n}}", receiver_text),
+                &format!("match {receiver_text} {{\n    ${{1:_}} => {{$0}},\n}}"),
             )
             .add_to(acc);
         }
     }
 
-    postfix_snippet("box", "Box::new(expr)", &format!("Box::new({})", receiver_text)).add_to(acc);
-    postfix_snippet("dbg", "dbg!(expr)", &format!("dbg!({})", receiver_text)).add_to(acc); // fixme
-    postfix_snippet("dbgr", "dbg!(&expr)", &format!("dbg!(&{})", receiver_text)).add_to(acc);
-    postfix_snippet("call", "function(expr)", &format!("${{1}}({})", receiver_text)).add_to(acc);
+    postfix_snippet("box", "Box::new(expr)", &format!("Box::new({receiver_text})")).add_to(acc);
+    postfix_snippet("dbg", "dbg!(expr)", &format!("dbg!({receiver_text})")).add_to(acc); // fixme
+    postfix_snippet("dbgr", "dbg!(&expr)", &format!("dbg!(&{receiver_text})")).add_to(acc);
+    postfix_snippet("call", "function(expr)", &format!("${{1}}({receiver_text})")).add_to(acc);
 
     if let Some(parent) = dot_receiver.syntax().parent().and_then(|p| p.parent()) {
         if matches!(parent.kind(), STMT_LIST | EXPR_STMT) {
-            postfix_snippet("let", "let", &format!("let $0 = {};", receiver_text)).add_to(acc);
-            postfix_snippet("letm", "let mut", &format!("let mut $0 = {};", receiver_text))
+            postfix_snippet("let", "let", &format!("let $0 = {receiver_text};")).add_to(acc);
+            postfix_snippet("letm", "let mut", &format!("let mut $0 = {receiver_text};"))
                 .add_to(acc);
         }
     }
@@ -210,14 +207,35 @@ fn get_receiver_text(receiver: &ast::Expr, receiver_is_ambiguous_float_literal:
     text.replace('\\', "\\\\").replace('$', "\\$")
 }
 
-fn include_references(initial_element: &ast::Expr) -> ast::Expr {
+fn include_references(initial_element: &ast::Expr) -> (ast::Expr, ast::Expr) {
     let mut resulting_element = initial_element.clone();
-    while let Some(parent_ref_element) =
-        resulting_element.syntax().parent().and_then(ast::RefExpr::cast)
+
+    while let Some(field_expr) = resulting_element.syntax().parent().and_then(ast::FieldExpr::cast)
     {
-        resulting_element = ast::Expr::from(parent_ref_element);
+        resulting_element = ast::Expr::from(field_expr);
     }
-    resulting_element
+
+    let mut new_element_opt = initial_element.clone();
+
+    if let Some(first_ref_expr) = resulting_element.syntax().parent().and_then(ast::RefExpr::cast) {
+        if let Some(expr) = first_ref_expr.expr() {
+            resulting_element = expr;
+        }
+
+        while let Some(parent_ref_element) =
+            resulting_element.syntax().parent().and_then(ast::RefExpr::cast)
+        {
+            resulting_element = ast::Expr::from(parent_ref_element);
+
+            new_element_opt = make::expr_ref(new_element_opt, false);
+        }
+    } else {
+        // If we do not find any ref expressions, restore
+        // all the progress of tree climbing
+        resulting_element = initial_element.clone();
+    }
+
+    (resulting_element, new_element_opt)
 }
 
 fn build_postfix_snippet_builder<'ctx>(
@@ -225,8 +243,7 @@ fn build_postfix_snippet_builder<'ctx>(
     cap: SnippetCap,
     receiver: &'ctx ast::Expr,
 ) -> Option<impl Fn(&str, &str, &str) -> Builder + 'ctx> {
-    let receiver_syntax = receiver.syntax();
-    let receiver_range = ctx.sema.original_range_opt(receiver_syntax)?.range;
+    let receiver_range = ctx.sema.original_range_opt(receiver.syntax())?.range;
     if ctx.source_range().end() < receiver_range.start() {
         // This shouldn't happen, yet it does. I assume this might be due to an incorrect token mapping.
         return None;
@@ -278,7 +295,7 @@ fn add_custom_postfix_completions(
             let body = snippet.postfix_snippet(receiver_text);
             let mut builder =
                 postfix_snippet(trigger, snippet.description.as_deref().unwrap_or_default(), &body);
-            builder.documentation(Documentation::new(format!("```rust\n{}\n```", body)));
+            builder.documentation(Documentation::new(format!("```rust\n{body}\n```")));
             for import in imports.into_iter() {
                 builder.add_import(import);
             }
@@ -549,7 +566,7 @@ fn main() { ControlFlow::Break('\\\\') }
         );
 
         check_edit_with_config(
-            config.clone(),
+            config,
             "break",
             r#"
 //- minicore: try
@@ -578,12 +595,12 @@ fn main() {
         check_edit(
             "format",
             r#"fn main() { "{some_var:?}".$0 }"#,
-            r#"fn main() { format!("{:?}", some_var) }"#,
+            r#"fn main() { format!("{some_var:?}") }"#,
         );
         check_edit(
             "panic",
             r#"fn main() { "Panic with {a}".$0 }"#,
-            r#"fn main() { panic!("Panic with {}", a) }"#,
+            r#"fn main() { panic!("Panic with {a}") }"#,
         );
         check_edit(
             "println",
@@ -616,22 +633,55 @@ fn main() {
 
     #[test]
     fn postfix_custom_snippets_completion_for_references() {
+        // https://github.com/rust-lang/rust-analyzer/issues/7929
+
+        let snippet = Snippet::new(
+            &[],
+            &["ok".into()],
+            &["Ok(${receiver})".into()],
+            "",
+            &[],
+            crate::SnippetScope::Expr,
+        )
+        .unwrap();
+
         check_edit_with_config(
-            CompletionConfig {
-                snippets: vec![Snippet::new(
-                    &[],
-                    &["ok".into()],
-                    &["Ok(${receiver})".into()],
-                    "",
-                    &[],
-                    crate::SnippetScope::Expr,
-                )
-                .unwrap()],
-                ..TEST_CONFIG
-            },
+            CompletionConfig { snippets: vec![snippet.clone()], ..TEST_CONFIG },
+            "ok",
+            r#"fn main() { &&42.o$0 }"#,
+            r#"fn main() { Ok(&&42) }"#,
+        );
+
+        check_edit_with_config(
+            CompletionConfig { snippets: vec![snippet.clone()], ..TEST_CONFIG },
             "ok",
             r#"fn main() { &&42.$0 }"#,
             r#"fn main() { Ok(&&42) }"#,
         );
+
+        check_edit_with_config(
+            CompletionConfig { snippets: vec![snippet], ..TEST_CONFIG },
+            "ok",
+            r#"
+struct A {
+    a: i32,
+}
+
+fn main() {
+    let a = A {a :1};
+    &a.a.$0
+}
+            "#,
+            r#"
+struct A {
+    a: i32,
+}
+
+fn main() {
+    let a = A {a :1};
+    Ok(&a.a)
+}
+            "#,
+        );
     }
 }
diff --git a/crates/ide-completion/src/completions/postfix/format_like.rs b/crates/ide-completion/src/completions/postfix/format_like.rs
index b43bdb9ab9..dfcc78e923 100644
--- a/crates/ide-completion/src/completions/postfix/format_like.rs
+++ b/crates/ide-completion/src/completions/postfix/format_like.rs
@@ -54,7 +54,11 @@ pub(crate) fn add_format_like_completions(
     if let Ok((out, exprs)) = parse_format_exprs(receiver_text.text()) {
         let exprs = with_placeholders(exprs);
         for (label, macro_name) in KINDS {
-            let snippet = format!(r#"{}({}, {})"#, macro_name, out, exprs.join(", "));
+            let snippet = if exprs.is_empty() {
+                format!(r#"{}({})"#, macro_name, out)
+            } else {
+                format!(r#"{}({}, {})"#, macro_name, out, exprs.join(", "))
+            };
 
             postfix_snippet(label, macro_name, &snippet).add_to(acc);
         }
@@ -72,16 +76,29 @@ mod tests {
             ("eprintln!", "{}", r#"eprintln!("{}", $1)"#),
             (
                 "log::info!",
-                "{} {expr} {} {2 + 2}",
-                r#"log::info!("{} {} {} {}", $1, expr, $2, 2 + 2)"#,
+                "{} {ident} {} {2 + 2}",
+                r#"log::info!("{} {ident} {} {}", $1, $2, 2 + 2)"#,
             ),
-            ("format!", "{expr:?}", r#"format!("{:?}", expr)"#),
         ];
 
         for (kind, input, output) in test_vector {
             let (parsed_string, exprs) = parse_format_exprs(input).unwrap();
             let exprs = with_placeholders(exprs);
-            let snippet = format!(r#"{}("{}", {})"#, kind, parsed_string, exprs.join(", "));
+            let snippet = format!(r#"{kind}("{parsed_string}", {})"#, exprs.join(", "));
+            assert_eq!(&snippet, output);
+        }
+    }
+
+    #[test]
+    fn test_into_suggestion_no_epxrs() {
+        let test_vector = &[
+            ("println!", "{ident}", r#"println!("{ident}")"#),
+            ("format!", "{ident:?}", r#"format!("{ident:?}")"#),
+        ];
+
+        for (kind, input, output) in test_vector {
+            let (parsed_string, _exprs) = parse_format_exprs(input).unwrap();
+            let snippet = format!(r#"{}("{}")"#, kind, parsed_string);
             assert_eq!(&snippet, output);
         }
     }
diff --git a/crates/ide-completion/src/completions/record.rs b/crates/ide-completion/src/completions/record.rs
index 5d96fbd30a..0521e735de 100644
--- a/crates/ide-completion/src/completions/record.rs
+++ b/crates/ide-completion/src/completions/record.rs
@@ -124,7 +124,12 @@ fn complete_fields(
 
 #[cfg(test)]
 mod tests {
-    use crate::tests::check_edit;
+    use ide_db::SnippetCap;
+
+    use crate::{
+        tests::{check_edit, check_edit_with_config, TEST_CONFIG},
+        CompletionConfig,
+    };
 
     #[test]
     fn literal_struct_completion_edit() {
@@ -151,6 +156,66 @@ fn baz() {
         )
     }
 
+    #[test]
+    fn enum_variant_no_snippets() {
+        let conf = CompletionConfig { snippet_cap: SnippetCap::new(false), ..TEST_CONFIG };
+        // tuple variant
+        check_edit_with_config(
+            conf.clone(),
+            "Variant()",
+            r#"
+enum Enum {
+    Variant(usize),
+}
+
+impl Enum {
+    fn new(u: usize) -> Self {
+        Self::Va$0
+    }
+}
+"#,
+            r#"
+enum Enum {
+    Variant(usize),
+}
+
+impl Enum {
+    fn new(u: usize) -> Self {
+        Self::Variant
+    }
+}
+"#,
+        );
+
+        // record variant
+        check_edit_with_config(
+            conf,
+            "Variant{}",
+            r#"
+enum Enum {
+    Variant{u: usize},
+}
+
+impl Enum {
+    fn new(u: usize) -> Self {
+        Self::Va$0
+    }
+}
+"#,
+            r#"
+enum Enum {
+    Variant{u: usize},
+}
+
+impl Enum {
+    fn new(u: usize) -> Self {
+        Self::Variant
+    }
+}
+"#,
+        )
+    }
+
     #[test]
     fn literal_struct_impl_self_completion() {
         check_edit(
diff --git a/crates/ide-completion/src/completions/snippet.rs b/crates/ide-completion/src/completions/snippet.rs
index 66adb42863..da1f0542d2 100644
--- a/crates/ide-completion/src/completions/snippet.rs
+++ b/crates/ide-completion/src/completions/snippet.rs
@@ -141,7 +141,7 @@ fn add_custom_completions(
             };
             let body = snip.snippet();
             let mut builder = snippet(ctx, cap, trigger, &body);
-            builder.documentation(Documentation::new(format!("```rust\n{}\n```", body)));
+            builder.documentation(Documentation::new(format!("```rust\n{body}\n```")));
             for import in imports.into_iter() {
                 builder.add_import(import);
             }
diff --git a/crates/ide-completion/src/completions/type.rs b/crates/ide-completion/src/completions/type.rs
index 8f9db2f94c..37849c251a 100644
--- a/crates/ide-completion/src/completions/type.rs
+++ b/crates/ide-completion/src/completions/type.rs
@@ -58,7 +58,7 @@ pub(crate) fn complete_type_path(
             trait_.items(ctx.sema.db).into_iter().for_each(|item| add_assoc_item(acc, item))
         }
         Qualified::TypeAnchor { ty: Some(ty), trait_: None } => {
-            ctx.iterate_path_candidates(&ty, |item| {
+            ctx.iterate_path_candidates(ty, |item| {
                 add_assoc_item(acc, item);
             });
 
diff --git a/crates/ide-completion/src/context.rs b/crates/ide-completion/src/context.rs
index 9850813a0c..aa77f44953 100644
--- a/crates/ide-completion/src/context.rs
+++ b/crates/ide-completion/src/context.rs
@@ -19,7 +19,7 @@ use syntax::{
     ast::{self, AttrKind, NameOrNameRef},
     AstNode,
     SyntaxKind::{self, *},
-    SyntaxToken, TextRange, TextSize,
+    SyntaxToken, TextRange, TextSize, T,
 };
 use text_edit::Indel;
 
@@ -569,6 +569,32 @@ impl<'a> CompletionContext<'a> {
         // completing on
         let original_token = original_file.syntax().token_at_offset(offset).left_biased()?;
 
+        // try to skip completions on path with invalid colons
+        // this approach works in normal path and inside token tree
+        match original_token.kind() {
+            T![:] => {
+                // return if no prev token before colon
+                let prev_token = original_token.prev_token()?;
+
+                // only has a single colon
+                if prev_token.kind() != T![:] {
+                    return None;
+                }
+
+                // has 3 colon or 2 coloncolon in a row
+                // special casing this as per discussion in https://github.com/rust-lang/rust-analyzer/pull/13611#discussion_r1031845205
+                // and https://github.com/rust-lang/rust-analyzer/pull/13611#discussion_r1032812751
+                if prev_token
+                    .prev_token()
+                    .map(|t| t.kind() == T![:] || t.kind() == T![::])
+                    .unwrap_or(false)
+                {
+                    return None;
+                }
+            }
+            _ => {}
+        }
+
         let AnalysisResult {
             analysis,
             expected: (expected_type, expected_name),
diff --git a/crates/ide-completion/src/context/analysis.rs b/crates/ide-completion/src/context/analysis.rs
index c142a7305f..e34824e22e 100644
--- a/crates/ide-completion/src/context/analysis.rs
+++ b/crates/ide-completion/src/context/analysis.rs
@@ -226,7 +226,7 @@ fn analyze(
             find_node_at_offset(&file_with_fake_ident, offset)
         {
             let parent = name_ref.syntax().parent()?;
-            let (mut nameref_ctx, _) = classify_name_ref(&sema, &original_file, name_ref, parent)?;
+            let (mut nameref_ctx, _) = classify_name_ref(sema, &original_file, name_ref, parent)?;
             if let NameRefKind::Path(path_ctx) = &mut nameref_ctx.kind {
                 path_ctx.kind = PathKind::Derive {
                     existing_derives: sema
@@ -277,7 +277,7 @@ fn analyze(
             return Some((analysis, (None, None), QualifierCtx::default()));
         }
     };
-    let expected = expected_type_and_name(sema, &self_token, &name_like);
+    let expected = expected_type_and_name(sema, self_token, &name_like);
     let mut qual_ctx = QualifierCtx::default();
     let analysis = match name_like {
         ast::NameLike::Lifetime(lifetime) => {
@@ -286,7 +286,7 @@ fn analyze(
         ast::NameLike::NameRef(name_ref) => {
             let parent = name_ref.syntax().parent()?;
             let (nameref_ctx, qualifier_ctx) =
-                classify_name_ref(sema, &original_file, name_ref, parent.clone())?;
+                classify_name_ref(sema, &original_file, name_ref, parent)?;
             qual_ctx = qualifier_ctx;
             CompletionAnalysis::NameRef(nameref_ctx)
         }
@@ -374,7 +374,7 @@ fn expected_type_and_name(
                 ast::ArgList(_) => {
                     cov_mark::hit!(expected_type_fn_param);
                     ActiveParameter::at_token(
-                        &sema,
+                        sema,
                        token.clone(),
                     ).map(|ap| {
                         let name = ap.ident().map(NameOrNameRef::Name);
@@ -507,7 +507,7 @@ fn classify_lifetime(
             _ => LifetimeKind::Lifetime,
         }
     };
-    let lifetime = find_node_at_offset(&original_file, lifetime.syntax().text_range().start());
+    let lifetime = find_node_at_offset(original_file, lifetime.syntax().text_range().start());
 
     Some(LifetimeContext { lifetime, kind })
 }
@@ -548,7 +548,7 @@ fn classify_name(
             _ => return None,
         }
     };
-    let name = find_node_at_offset(&original_file, name.syntax().text_range().start());
+    let name = find_node_at_offset(original_file, name.syntax().text_range().start());
     Some(NameContext { name, kind })
 }
 
@@ -558,7 +558,7 @@ fn classify_name_ref(
     name_ref: ast::NameRef,
     parent: SyntaxNode,
 ) -> Option<(NameRefContext, QualifierCtx)> {
-    let nameref = find_node_at_offset(&original_file, name_ref.syntax().text_range().start());
+    let nameref = find_node_at_offset(original_file, name_ref.syntax().text_range().start());
 
     let make_res = |kind| (NameRefContext { nameref: nameref.clone(), kind }, Default::default());
 
@@ -585,11 +585,7 @@ fn classify_name_ref(
                 original_file,
                 &record_field.parent_record_pat(),
             ),
-            ..pattern_context_for(
-                sema,
-                original_file,
-                record_field.parent_record_pat().clone().into(),
-            )
+            ..pattern_context_for(sema, original_file, record_field.parent_record_pat().into())
         });
         return Some(make_res(kind));
     }
diff --git a/crates/ide-completion/src/context/tests.rs b/crates/ide-completion/src/context/tests.rs
index 50845b3881..a654a5db57 100644
--- a/crates/ide-completion/src/context/tests.rs
+++ b/crates/ide-completion/src/context/tests.rs
@@ -19,7 +19,7 @@ fn check_expected_type_and_name(ra_fixture: &str, expect: Expect) {
     let name =
         completion_context.expected_name.map_or_else(|| "?".to_owned(), |name| name.to_string());
 
-    expect.assert_eq(&format!("ty: {}, name: {}", ty, name));
+    expect.assert_eq(&format!("ty: {ty}, name: {name}"));
 }
 
 #[test]
diff --git a/crates/ide-completion/src/item.rs b/crates/ide-completion/src/item.rs
index 27c3ccb35a..657eab5b1b 100644
--- a/crates/ide-completion/src/item.rs
+++ b/crates/ide-completion/src/item.rs
@@ -453,10 +453,10 @@ impl Builder {
             // snippets can have multiple imports, but normal completions only have up to one
             if let Some(original_path) = import_edit.original_path.as_ref() {
                 lookup = lookup.or_else(|| Some(label.clone()));
-                label = SmolStr::from(format!("{} (use {})", label, original_path));
+                label = SmolStr::from(format!("{label} (use {original_path})"));
             }
         } else if let Some(trait_name) = self.trait_name {
-            label = SmolStr::from(format!("{} (as {})", label, trait_name));
+            label = SmolStr::from(format!("{label} (as {trait_name})"));
         }
 
         let text_edit = match self.text_edit {
diff --git a/crates/ide-completion/src/lib.rs b/crates/ide-completion/src/lib.rs
index 9d0044e55f..4b48ec6bc3 100644
--- a/crates/ide-completion/src/lib.rs
+++ b/crates/ide-completion/src/lib.rs
@@ -164,7 +164,6 @@ pub fn completions(
                 completions::vis::complete_vis_path(&mut completions, ctx, path_ctx, has_in_token);
             }
         }
-        // prevent `(` from triggering unwanted completion noise
         return Some(completions.into());
     }
 
diff --git a/crates/ide-completion/src/render.rs b/crates/ide-completion/src/render.rs
index 86302cb067..e48d1aecd0 100644
--- a/crates/ide-completion/src/render.rs
+++ b/crates/ide-completion/src/render.rs
@@ -131,7 +131,7 @@ pub(crate) fn render_field(
     item.detail(ty.display(ctx.db()).to_string())
         .set_documentation(field.docs(ctx.db()))
         .set_deprecated(is_deprecated)
-        .lookup_by(name.clone());
+        .lookup_by(name);
     item.insert_text(field_with_receiver(receiver.as_ref(), &escaped_name));
     if let Some(receiver) = &dot_access.receiver {
         if let Some(original) = ctx.completion.sema.original_ast_node(receiver.clone()) {
@@ -144,8 +144,7 @@ pub(crate) fn render_field(
 }
 
 fn field_with_receiver(receiver: Option<&hir::Name>, field_name: &str) -> SmolStr {
-    receiver
-        .map_or_else(|| field_name.into(), |receiver| format!("{}.{}", receiver, field_name).into())
+    receiver.map_or_else(|| field_name.into(), |receiver| format!("{receiver}.{field_name}").into())
 }
 
 pub(crate) fn render_tuple_field(
@@ -306,7 +305,7 @@ fn render_resolution_path(
                 item.lookup_by(name.clone())
                     .label(SmolStr::from_iter([&name, "<…>"]))
                     .trigger_call_info()
-                    .insert_snippet(cap, format!("{}<$0>", local_name));
+                    .insert_snippet(cap, format!("{local_name}<$0>"));
             }
         }
     }
@@ -528,13 +527,13 @@ mod tests {
 
                 let tag = it.kind().tag();
                 let relevance = display_relevance(it.relevance());
-                items.push(format!("{} {} {}\n", tag, it.label(), relevance));
+                items.push(format!("{tag} {} {relevance}\n", it.label()));
 
                 if let Some((mutability, _offset, relevance)) = it.ref_match() {
                     let label = format!("&{}{}", mutability.as_keyword_for_ref(), it.label());
                     let relevance = display_relevance(relevance);
 
-                    items.push(format!("{} {} {}\n", tag, label, relevance));
+                    items.push(format!("{tag} {label} {relevance}\n"));
                 }
 
                 items
@@ -563,7 +562,7 @@ mod tests {
             .filter_map(|(cond, desc)| if cond { Some(desc) } else { None })
             .join("+");
 
-            format!("[{}]", relevance_factors)
+            format!("[{relevance_factors}]")
         }
     }
 
diff --git a/crates/ide-completion/src/render/const_.rs b/crates/ide-completion/src/render/const_.rs
index 93ea825e00..70b19988ca 100644
--- a/crates/ide-completion/src/render/const_.rs
+++ b/crates/ide-completion/src/render/const_.rs
@@ -16,7 +16,7 @@ fn render(ctx: RenderContext<'_>, const_: hir::Const) -> Option<CompletionItem>
     let (name, escaped_name) = (name.unescaped().to_smol_str(), name.to_smol_str());
     let detail = const_.display(db).to_string();
 
-    let mut item = CompletionItem::new(SymbolKind::Const, ctx.source_range(), name.clone());
+    let mut item = CompletionItem::new(SymbolKind::Const, ctx.source_range(), name);
     item.set_documentation(ctx.docs(const_))
         .set_deprecated(ctx.is_deprecated(const_) || ctx.is_deprecated_assoc_item(const_))
         .detail(detail)
diff --git a/crates/ide-completion/src/render/function.rs b/crates/ide-completion/src/render/function.rs
index 3761208460..197592e78c 100644
--- a/crates/ide-completion/src/render/function.rs
+++ b/crates/ide-completion/src/render/function.rs
@@ -53,7 +53,7 @@ fn render(
     let (call, escaped_call) = match &func_kind {
         FuncKind::Method(_, Some(receiver)) => (
             format!("{}.{}", receiver.unescaped(), name.unescaped()).into(),
-            format!("{}.{}", receiver, name).into(),
+            format!("{receiver}.{name}").into(),
         ),
         _ => (name.unescaped().to_smol_str(), name.to_smol_str()),
     };
@@ -162,7 +162,7 @@ pub(super) fn add_call_parens<'b>(
     cov_mark::hit!(inserts_parens_for_function_calls);
 
     let (snippet, label_suffix) = if self_param.is_none() && params.is_empty() {
-        (format!("{}()$0", escaped_name), "()")
+        (format!("{escaped_name}()$0"), "()")
     } else {
         builder.trigger_call_info();
         let snippet = if let Some(CallableSnippets::FillArguments) = ctx.config.callable {
@@ -174,7 +174,7 @@ pub(super) fn add_call_parens<'b>(
                             let smol_str = n.to_smol_str();
                             let text = smol_str.as_str().trim_start_matches('_');
                             let ref_ = ref_of_param(ctx, text, param.ty());
-                            f(&format_args!("${{{}:{}{}}}", index + offset, ref_, text))
+                            f(&format_args!("${{{}:{ref_}{text}}}", index + offset))
                         }
                         None => {
                             let name = match param.ty().as_adt() {
@@ -185,7 +185,7 @@ pub(super) fn add_call_parens<'b>(
                                     .map(|s| to_lower_snake_case(s.as_str()))
                                     .unwrap_or_else(|| "_".to_string()),
                             };
-                            f(&format_args!("${{{}:{}}}", index + offset, name))
+                            f(&format_args!("${{{}:{name}}}", index + offset))
                         }
                     }
                 });
@@ -200,12 +200,12 @@ pub(super) fn add_call_parens<'b>(
                     )
                 }
                 None => {
-                    format!("{}({})$0", escaped_name, function_params_snippet)
+                    format!("{escaped_name}({function_params_snippet})$0")
                 }
             }
         } else {
             cov_mark::hit!(suppress_arg_snippets);
-            format!("{}($0)", escaped_name)
+            format!("{escaped_name}($0)")
         };
 
         (snippet, "(…)")
diff --git a/crates/ide-completion/src/render/literal.rs b/crates/ide-completion/src/render/literal.rs
index 0c791ac570..64dab02f7c 100644
--- a/crates/ide-completion/src/render/literal.rs
+++ b/crates/ide-completion/src/render/literal.rs
@@ -84,7 +84,7 @@ fn render(
         }
         _ => RenderedLiteral {
             literal: escaped_qualified_name.clone(),
-            detail: escaped_qualified_name.clone(),
+            detail: escaped_qualified_name,
         },
     };
 
@@ -96,7 +96,7 @@ fn render(
     if !should_add_parens {
         kind = StructKind::Unit;
     }
-    let label = format_literal_label(&qualified_name, kind);
+    let label = format_literal_label(&qualified_name, kind, snippet_cap);
     let lookup = if qualified {
         format_literal_lookup(&short_qualified_name.to_string(), kind)
     } else {
diff --git a/crates/ide-completion/src/render/macro_.rs b/crates/ide-completion/src/render/macro_.rs
index eabd0bd17d..ffcad1185a 100644
--- a/crates/ide-completion/src/render/macro_.rs
+++ b/crates/ide-completion/src/render/macro_.rs
@@ -66,7 +66,7 @@ fn render(
 
     match ctx.snippet_cap() {
         Some(cap) if needs_bang && !has_call_parens => {
-            let snippet = format!("{}!{}$0{}", escaped_name, bra, ket);
+            let snippet = format!("{escaped_name}!{bra}$0{ket}");
             let lookup = banged_name(&name);
             item.insert_snippet(cap, snippet).lookup_by(lookup);
         }
diff --git a/crates/ide-completion/src/render/pattern.rs b/crates/ide-completion/src/render/pattern.rs
index c845ff21aa..21b4bc2174 100644
--- a/crates/ide-completion/src/render/pattern.rs
+++ b/crates/ide-completion/src/render/pattern.rs
@@ -33,7 +33,7 @@ pub(crate) fn render_struct_pat(
     let name = local_name.unwrap_or_else(|| strukt.name(ctx.db()));
     let (name, escaped_name) = (name.unescaped().to_smol_str(), name.to_smol_str());
     let kind = strukt.kind(ctx.db());
-    let label = format_literal_label(name.as_str(), kind);
+    let label = format_literal_label(name.as_str(), kind, ctx.snippet_cap());
     let lookup = format_literal_lookup(name.as_str(), kind);
     let pat = render_pat(&ctx, pattern_ctx, &escaped_name, kind, &visible_fields, fields_omitted)?;
 
@@ -67,7 +67,7 @@ pub(crate) fn render_variant_pat(
         }
         _ => {
             let kind = variant.kind(ctx.db());
-            let label = format_literal_label(name.as_str(), kind);
+            let label = format_literal_label(name.as_str(), kind, ctx.snippet_cap());
             let lookup = format_literal_lookup(name.as_str(), kind);
             let pat = render_pat(
                 &ctx,
diff --git a/crates/ide-completion/src/render/type_alias.rs b/crates/ide-completion/src/render/type_alias.rs
index de919429f2..fbe120d2ac 100644
--- a/crates/ide-completion/src/render/type_alias.rs
+++ b/crates/ide-completion/src/render/type_alias.rs
@@ -40,7 +40,7 @@ fn render(
     };
     let detail = type_alias.display(db).to_string();
 
-    let mut item = CompletionItem::new(SymbolKind::TypeAlias, ctx.source_range(), name.clone());
+    let mut item = CompletionItem::new(SymbolKind::TypeAlias, ctx.source_range(), name);
     item.set_documentation(ctx.docs(type_alias))
         .set_deprecated(ctx.is_deprecated(type_alias) || ctx.is_deprecated_assoc_item(type_alias))
         .detail(detail)
diff --git a/crates/ide-completion/src/render/union_literal.rs b/crates/ide-completion/src/render/union_literal.rs
index 54e97dd57b..1b09ad1731 100644
--- a/crates/ide-completion/src/render/union_literal.rs
+++ b/crates/ide-completion/src/render/union_literal.rs
@@ -24,7 +24,7 @@ pub(crate) fn render_union_literal(
         Some(p) => (p.unescaped().to_string(), p.to_string()),
         None => (name.unescaped().to_string(), name.to_string()),
     };
-    let label = format_literal_label(&name.to_smol_str(), StructKind::Record);
+    let label = format_literal_label(&name.to_smol_str(), StructKind::Record, ctx.snippet_cap());
     let lookup = format_literal_lookup(&name.to_smol_str(), StructKind::Record);
     let mut item = CompletionItem::new(
         CompletionItemKind::SymbolKind(SymbolKind::Union),
@@ -68,7 +68,7 @@ pub(crate) fn render_union_literal(
 
     item.set_documentation(ctx.docs(un))
         .set_deprecated(ctx.is_deprecated(un))
-        .detail(&detail)
+        .detail(detail)
         .set_relevance(ctx.completion_relevance());
 
     match ctx.snippet_cap() {
diff --git a/crates/ide-completion/src/render/variant.rs b/crates/ide-completion/src/render/variant.rs
index 24e6abdc9a..55c55725be 100644
--- a/crates/ide-completion/src/render/variant.rs
+++ b/crates/ide-completion/src/render/variant.rs
@@ -22,6 +22,9 @@ pub(crate) fn render_record_lit(
     fields: &[hir::Field],
     path: &str,
 ) -> RenderedLiteral {
+    if snippet_cap.is_none() {
+        return RenderedLiteral { literal: path.to_string(), detail: path.to_string() };
+    }
     let completions = fields.iter().enumerate().format_with(", ", |(idx, field), f| {
         if snippet_cap.is_some() {
             f(&format_args!("{}: ${{{}:()}}", field.name(db), idx + 1))
@@ -35,8 +38,8 @@ pub(crate) fn render_record_lit(
     });
 
     RenderedLiteral {
-        literal: format!("{} {{ {} }}", path, completions),
-        detail: format!("{} {{ {} }}", path, types),
+        literal: format!("{path} {{ {completions} }}"),
+        detail: format!("{path} {{ {types} }}"),
     }
 }
 
@@ -48,6 +51,9 @@ pub(crate) fn render_tuple_lit(
     fields: &[hir::Field],
     path: &str,
 ) -> RenderedLiteral {
+    if snippet_cap.is_none() {
+        return RenderedLiteral { literal: path.to_string(), detail: path.to_string() };
+    }
     let completions = fields.iter().enumerate().format_with(", ", |(idx, _), f| {
         if snippet_cap.is_some() {
             f(&format_args!("${{{}:()}}", idx + 1))
@@ -59,8 +65,8 @@ pub(crate) fn render_tuple_lit(
     let types = fields.iter().format_with(", ", |field, f| f(&field.ty(db).display(db)));
 
     RenderedLiteral {
-        literal: format!("{}({})", path, completions),
-        detail: format!("{}({})", path, types),
+        literal: format!("{path}({completions})"),
+        detail: format!("{path}({types})"),
     }
 }
 
@@ -87,7 +93,14 @@ pub(crate) fn visible_fields(
 }
 
 /// Format a struct, etc. literal option for display in the completions menu.
-pub(crate) fn format_literal_label(name: &str, kind: StructKind) -> SmolStr {
+pub(crate) fn format_literal_label(
+    name: &str,
+    kind: StructKind,
+    snippet_cap: Option<SnippetCap>,
+) -> SmolStr {
+    if snippet_cap.is_none() {
+        return name.into();
+    }
     match kind {
         StructKind::Tuple => SmolStr::from_iter([name, "(…)"]),
         StructKind::Record => SmolStr::from_iter([name, " {…}"]),
diff --git a/crates/ide-completion/src/snippet.rs b/crates/ide-completion/src/snippet.rs
index f3b8eae4fe..343719c536 100644
--- a/crates/ide-completion/src/snippet.rs
+++ b/crates/ide-completion/src/snippet.rs
@@ -199,7 +199,7 @@ fn validate_snippet(
 ) -> Option<(Box<[GreenNode]>, String, Option<Box<str>>)> {
     let mut imports = Vec::with_capacity(requires.len());
     for path in requires.iter() {
-        let use_path = ast::SourceFile::parse(&format!("use {};", path))
+        let use_path = ast::SourceFile::parse(&format!("use {path};"))
             .syntax_node()
             .descendants()
             .find_map(ast::Path::cast)?;
diff --git a/crates/ide-completion/src/tests.rs b/crates/ide-completion/src/tests.rs
index 9e2beb9ee3..abe14e48e2 100644
--- a/crates/ide-completion/src/tests.rs
+++ b/crates/ide-completion/src/tests.rs
@@ -86,7 +86,7 @@ pub(crate) fn completion_list_no_kw(ra_fixture: &str) -> String {
 }
 
 pub(crate) fn completion_list_no_kw_with_private_editable(ra_fixture: &str) -> String {
-    let mut config = TEST_CONFIG.clone();
+    let mut config = TEST_CONFIG;
     config.enable_private_editable = true;
     completion_list_with_config(config, ra_fixture, false, None)
 }
@@ -153,7 +153,7 @@ fn render_completion_list(completions: Vec<CompletionItem>) -> String {
         .into_iter()
         .map(|it| {
             let tag = it.kind().tag();
-            let var_name = format!("{} {}", tag, it.label());
+            let var_name = format!("{tag} {}", it.label());
             let mut buf = var_name;
             if let Some(detail) = it.detail() {
                 let width = label_width.saturating_sub(monospace_width(it.label()));
@@ -183,12 +183,12 @@ pub(crate) fn check_edit_with_config(
     let ra_fixture_after = trim_indent(ra_fixture_after);
     let (db, position) = position(ra_fixture_before);
     let completions: Vec<CompletionItem> =
-        crate::completions(&db, &config, position, None).unwrap().into();
+        crate::completions(&db, &config, position, None).unwrap();
     let (completion,) = completions
         .iter()
         .filter(|it| it.lookup() == what)
         .collect_tuple()
-        .unwrap_or_else(|| panic!("can't find {:?} completion in {:#?}", what, completions));
+        .unwrap_or_else(|| panic!("can't find {what:?} completion in {completions:#?}"));
     let mut actual = db.file_text(position.file_id).to_string();
 
     let mut combined_edit = completion.text_edit().to_owned();
diff --git a/crates/ide-completion/src/tests/attribute.rs b/crates/ide-completion/src/tests/attribute.rs
index 1578ba2c37..4e60820dd6 100644
--- a/crates/ide-completion/src/tests/attribute.rs
+++ b/crates/ide-completion/src/tests/attribute.rs
@@ -607,6 +607,30 @@ fn attr_in_source_file_end() {
     );
 }
 
+#[test]
+fn invalid_path() {
+    check(
+        r#"
+//- proc_macros: identity
+#[proc_macros:::$0]
+struct Foo;
+"#,
+        expect![[r#""#]],
+    );
+
+    check(
+        r#"
+//- minicore: derive, copy
+mod foo {
+    pub use Copy as Bar;
+}
+#[derive(foo:::::$0)]
+struct Foo;
+"#,
+        expect![""],
+    );
+}
+
 mod cfg {
     use super::*;
 
diff --git a/crates/ide-completion/src/tests/expression.rs b/crates/ide-completion/src/tests/expression.rs
index 8e26d889f9..043f552bd8 100644
--- a/crates/ide-completion/src/tests/expression.rs
+++ b/crates/ide-completion/src/tests/expression.rs
@@ -4,7 +4,7 @@ use expect_test::{expect, Expect};
 use crate::tests::{check_edit, completion_list, BASE_ITEMS_FIXTURE};
 
 fn check(ra_fixture: &str, expect: Expect) {
-    let actual = completion_list(&format!("{}{}", BASE_ITEMS_FIXTURE, ra_fixture));
+    let actual = completion_list(&format!("{BASE_ITEMS_FIXTURE}{ra_fixture}"));
     expect.assert_eq(&actual)
 }
 
diff --git a/crates/ide-completion/src/tests/item.rs b/crates/ide-completion/src/tests/item.rs
index 409413c1dc..3ef2a7c942 100644
--- a/crates/ide-completion/src/tests/item.rs
+++ b/crates/ide-completion/src/tests/item.rs
@@ -7,7 +7,7 @@ use expect_test::{expect, Expect};
 use crate::tests::{completion_list, BASE_ITEMS_FIXTURE};
 
 fn check(ra_fixture: &str, expect: Expect) {
-    let actual = completion_list(&format!("{}{}", BASE_ITEMS_FIXTURE, ra_fixture));
+    let actual = completion_list(&format!("{BASE_ITEMS_FIXTURE}{ra_fixture}"));
     expect.assert_eq(&actual)
 }
 
diff --git a/crates/ide-completion/src/tests/item_list.rs b/crates/ide-completion/src/tests/item_list.rs
index 8ed6cb3cf8..b62b988885 100644
--- a/crates/ide-completion/src/tests/item_list.rs
+++ b/crates/ide-completion/src/tests/item_list.rs
@@ -1,10 +1,10 @@
 //! Completion tests for item list position.
 use expect_test::{expect, Expect};
 
-use crate::tests::{completion_list, BASE_ITEMS_FIXTURE};
+use crate::tests::{check_edit, completion_list, BASE_ITEMS_FIXTURE};
 
 fn check(ra_fixture: &str, expect: Expect) {
-    let actual = completion_list(&format!("{}{}", BASE_ITEMS_FIXTURE, ra_fixture));
+    let actual = completion_list(&format!("{BASE_ITEMS_FIXTURE}{ra_fixture}"));
     expect.assert_eq(&actual)
 }
 
@@ -277,3 +277,91 @@ fn after_unit_struct() {
         "#]],
     );
 }
+
+#[test]
+fn type_in_impl_trait() {
+    check_edit(
+        "type O",
+        r"
+struct A;
+trait B {
+type O: ?Sized;
+}
+impl B for A {
+$0
+}
+",
+        r#"
+struct A;
+trait B {
+type O: ?Sized;
+}
+impl B for A {
+type O = $0;
+}
+"#,
+    );
+    check_edit(
+        "type O",
+        r"
+struct A;
+trait B {
+type O;
+}
+impl B for A {
+$0
+}
+",
+        r#"
+struct A;
+trait B {
+type O;
+}
+impl B for A {
+type O = $0;
+}
+"#,
+    );
+    check_edit(
+        "type O",
+        r"
+struct A;
+trait B {
+type O: ?Sized = u32;
+}
+impl B for A {
+$0
+}
+",
+        r#"
+struct A;
+trait B {
+type O: ?Sized = u32;
+}
+impl B for A {
+type O = $0;
+}
+"#,
+    );
+    check_edit(
+        "type O",
+        r"
+struct A;
+trait B {
+type O = u32;
+}
+impl B for A {
+$0
+}
+",
+        r"
+struct A;
+trait B {
+type O = u32;
+}
+impl B for A {
+type O = $0;
+}
+",
+    )
+}
diff --git a/crates/ide-completion/src/tests/pattern.rs b/crates/ide-completion/src/tests/pattern.rs
index db8bef6640..ad9254e7f2 100644
--- a/crates/ide-completion/src/tests/pattern.rs
+++ b/crates/ide-completion/src/tests/pattern.rs
@@ -9,7 +9,7 @@ fn check_empty(ra_fixture: &str, expect: Expect) {
 }
 
 fn check(ra_fixture: &str, expect: Expect) {
-    let actual = completion_list(&format!("{}\n{}", BASE_ITEMS_FIXTURE, ra_fixture));
+    let actual = completion_list(&format!("{BASE_ITEMS_FIXTURE}\n{ra_fixture}"));
     expect.assert_eq(&actual)
 }
 
diff --git a/crates/ide-completion/src/tests/predicate.rs b/crates/ide-completion/src/tests/predicate.rs
index a8676e2f24..2656a4d545 100644
--- a/crates/ide-completion/src/tests/predicate.rs
+++ b/crates/ide-completion/src/tests/predicate.rs
@@ -4,7 +4,7 @@ use expect_test::{expect, Expect};
 use crate::tests::{completion_list, BASE_ITEMS_FIXTURE};
 
 fn check(ra_fixture: &str, expect: Expect) {
-    let actual = completion_list(&format!("{}\n{}", BASE_ITEMS_FIXTURE, ra_fixture));
+    let actual = completion_list(&format!("{BASE_ITEMS_FIXTURE}\n{ra_fixture}"));
     expect.assert_eq(&actual)
 }
 
diff --git a/crates/ide-completion/src/tests/special.rs b/crates/ide-completion/src/tests/special.rs
index 033dc99c26..cad4af4937 100644
--- a/crates/ide-completion/src/tests/special.rs
+++ b/crates/ide-completion/src/tests/special.rs
@@ -2,13 +2,22 @@
 
 use expect_test::{expect, Expect};
 
-use crate::tests::{check_edit, completion_list_no_kw};
+use crate::tests::{check_edit, completion_list_no_kw, completion_list_with_trigger_character};
 
 fn check(ra_fixture: &str, expect: Expect) {
     let actual = completion_list_no_kw(ra_fixture);
     expect.assert_eq(&actual)
 }
 
+pub(crate) fn check_with_trigger_character(
+    ra_fixture: &str,
+    trigger_character: Option<char>,
+    expect: Expect,
+) {
+    let actual = completion_list_with_trigger_character(ra_fixture, trigger_character);
+    expect.assert_eq(&actual)
+}
+
 #[test]
 fn completes_if_prefix_is_keyword() {
     check_edit(
@@ -893,3 +902,82 @@ fn f() {
         "#]],
     );
 }
+
+#[test]
+fn completes_after_colon_with_trigger() {
+    check_with_trigger_character(
+        r#"
+//- minicore: option
+fn foo { ::$0 }
+"#,
+        Some(':'),
+        expect![[r#"
+            md core
+        "#]],
+    );
+    check_with_trigger_character(
+        r#"
+//- minicore: option
+fn foo { /* test */::$0 }
+"#,
+        Some(':'),
+        expect![[r#"
+            md core
+        "#]],
+    );
+
+    check_with_trigger_character(
+        r#"
+fn foo { crate::$0 }
+"#,
+        Some(':'),
+        expect![[r#"
+            fn foo() fn()
+        "#]],
+    );
+
+    check_with_trigger_character(
+        r#"
+fn foo { crate:$0 }
+"#,
+        Some(':'),
+        expect![""],
+    );
+}
+
+#[test]
+fn completes_after_colon_without_trigger() {
+    check_with_trigger_character(
+        r#"
+fn foo { crate::$0 }
+"#,
+        None,
+        expect![[r#"
+            fn foo() fn()
+        "#]],
+    );
+
+    check_with_trigger_character(
+        r#"
+fn foo { crate:$0 }
+"#,
+        None,
+        expect![""],
+    );
+}
+
+#[test]
+fn no_completions_in_invalid_path() {
+    check(
+        r#"
+fn foo { crate:::$0 }
+"#,
+        expect![""],
+    );
+    check(
+        r#"
+fn foo { crate::::$0 }
+"#,
+        expect![""],
+    )
+}
diff --git a/crates/ide-completion/src/tests/type_pos.rs b/crates/ide-completion/src/tests/type_pos.rs
index f0b7726c51..c3f4fb4d18 100644
--- a/crates/ide-completion/src/tests/type_pos.rs
+++ b/crates/ide-completion/src/tests/type_pos.rs
@@ -4,7 +4,7 @@ use expect_test::{expect, Expect};
 use crate::tests::{completion_list, BASE_ITEMS_FIXTURE};
 
 fn check(ra_fixture: &str, expect: Expect) {
-    let actual = completion_list(&format!("{}\n{}", BASE_ITEMS_FIXTURE, ra_fixture));
+    let actual = completion_list(&format!("{BASE_ITEMS_FIXTURE}\n{ra_fixture}"));
     expect.assert_eq(&actual)
 }
 
diff --git a/crates/ide-db/src/assists.rs b/crates/ide-db/src/assists.rs
index da23763dc2..8c6c1c44aa 100644
--- a/crates/ide-db/src/assists.rs
+++ b/crates/ide-db/src/assists.rs
@@ -88,7 +88,7 @@ impl FromStr for AssistKind {
             "RefactorExtract" => Ok(AssistKind::RefactorExtract),
             "RefactorInline" => Ok(AssistKind::RefactorInline),
             "RefactorRewrite" => Ok(AssistKind::RefactorRewrite),
-            unknown => Err(format!("Unknown AssistKind: '{}'", unknown)),
+            unknown => Err(format!("Unknown AssistKind: '{unknown}'")),
         }
     }
 }
diff --git a/crates/ide-db/src/imports/import_assets.rs b/crates/ide-db/src/imports/import_assets.rs
index 40a6a3e897..994d48385a 100644
--- a/crates/ide-db/src/imports/import_assets.rs
+++ b/crates/ide-db/src/imports/import_assets.rs
@@ -367,7 +367,7 @@ fn import_for_item(
     let expected_import_end = if item_as_assoc(db, original_item).is_some() {
         unresolved_qualifier.to_string()
     } else {
-        format!("{}::{}", unresolved_qualifier, item_name(db, original_item)?)
+        format!("{unresolved_qualifier}::{}", item_name(db, original_item)?)
     };
     if !import_path_string.contains(unresolved_first_segment)
         || !import_path_string.ends_with(&expected_import_end)
diff --git a/crates/ide-db/src/imports/insert_use/tests.rs b/crates/ide-db/src/imports/insert_use/tests.rs
index 59673af320..b92e367f7e 100644
--- a/crates/ide-db/src/imports/insert_use/tests.rs
+++ b/crates/ide-db/src/imports/insert_use/tests.rs
@@ -1014,7 +1014,7 @@ fn check_with_config(
         .and_then(|it| ImportScope::find_insert_use_container(&it, sema))
         .or_else(|| ImportScope::from(syntax))
         .unwrap();
-    let path = ast::SourceFile::parse(&format!("use {};", path))
+    let path = ast::SourceFile::parse(&format!("use {path};"))
         .tree()
         .syntax()
         .descendants()
diff --git a/crates/ide-db/src/imports/merge_imports.rs b/crates/ide-db/src/imports/merge_imports.rs
index 371d642c15..27b6321f3a 100644
--- a/crates/ide-db/src/imports/merge_imports.rs
+++ b/crates/ide-db/src/imports/merge_imports.rs
@@ -91,7 +91,7 @@ fn recursive_merge(lhs: &ast::UseTree, rhs: &ast::UseTree, merge: MergeBehavior)
         .flat_map(|list| list.use_trees())
         // We use Option here to early return from this function(this is not the
         // same as a `filter` op).
-        .map(|tree| merge.is_tree_allowed(&tree).then(|| tree))
+        .map(|tree| merge.is_tree_allowed(&tree).then_some(tree))
         .collect::<Option<_>>()?;
     use_trees.sort_unstable_by(|a, b| path_cmp_for_sort(a.path(), b.path()));
     for rhs_t in rhs.use_tree_list().into_iter().flat_map(|list| list.use_trees()) {
diff --git a/crates/ide-db/src/lib.rs b/crates/ide-db/src/lib.rs
index e0bc0f89f0..156bbb634e 100644
--- a/crates/ide-db/src/lib.rs
+++ b/crates/ide-db/src/lib.rs
@@ -165,7 +165,7 @@ pub trait LineIndexDatabase: base_db::SourceDatabase {
 
 fn line_index(db: &dyn LineIndexDatabase, file_id: FileId) -> Arc<LineIndex> {
     let text = db.file_text(file_id);
-    Arc::new(LineIndex::new(&*text))
+    Arc::new(LineIndex::new(&text))
 }
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord)]
diff --git a/crates/ide-db/src/rename.rs b/crates/ide-db/src/rename.rs
index 49b81265ea..cd4a7e1554 100644
--- a/crates/ide-db/src/rename.rs
+++ b/crates/ide-db/src/rename.rs
@@ -197,7 +197,7 @@ fn rename_mod(
 
         // Module exists in a named file
         if !is_mod_rs {
-            let path = format!("{}.rs", new_name);
+            let path = format!("{new_name}.rs");
             let dst = AnchoredPathBuf { anchor, path };
             source_change.push_file_system_edit(FileSystemEdit::MoveFile { src: anchor, dst })
         }
@@ -207,9 +207,7 @@ fn rename_mod(
         //  - Module has submodules defined in separate files
         let dir_paths = match (is_mod_rs, has_detached_child, module.name(sema.db)) {
             // Go up one level since the anchor is inside the dir we're trying to rename
-            (true, _, Some(mod_name)) => {
-                Some((format!("../{}", mod_name), format!("../{}", new_name)))
-            }
+            (true, _, Some(mod_name)) => Some((format!("../{mod_name}"), format!("../{new_name}"))),
             // The anchor is on the same level as target dir
             (false, true, Some(mod_name)) => Some((mod_name.to_string(), new_name.to_string())),
             _ => None,
@@ -356,7 +354,7 @@ fn source_edit_from_name(edit: &mut TextEditBuilder, name: &ast::Name, new_name:
 
             // FIXME: instead of splitting the shorthand, recursively trigger a rename of the
             // other name https://github.com/rust-lang/rust-analyzer/issues/6547
-            edit.insert(ident_pat.syntax().text_range().start(), format!("{}: ", new_name));
+            edit.insert(ident_pat.syntax().text_range().start(), format!("{new_name}: "));
             return true;
         }
     }
@@ -414,7 +412,7 @@ fn source_edit_from_name_ref(
                 // Foo { field } -> Foo { new_name: field }
                 //       ^ insert `new_name: `
                 let offset = name_ref.syntax().text_range().start();
-                edit.insert(offset, format!("{}: ", new_name));
+                edit.insert(offset, format!("{new_name}: "));
                 return true;
             }
             (None, Some(_)) if matches!(def, Definition::Local(_)) => {
@@ -422,7 +420,7 @@ fn source_edit_from_name_ref(
                 // Foo { field } -> Foo { field: new_name }
                 //            ^ insert `: new_name`
                 let offset = name_ref.syntax().text_range().end();
-                edit.insert(offset, format!(": {}", new_name));
+                edit.insert(offset, format!(": {new_name}"));
                 return true;
             }
             _ => (),
diff --git a/crates/ide-db/src/search.rs b/crates/ide-db/src/search.rs
index aa5d7e9beb..b2b0e49085 100644
--- a/crates/ide-db/src/search.rs
+++ b/crates/ide-db/src/search.rs
@@ -608,7 +608,7 @@ impl<'a> FindUsages<'a> {
                 let reference = FileReference {
                     range,
                     name: ast::NameLike::NameRef(name_ref.clone()),
-                    category: is_name_ref_in_import(name_ref).then(|| ReferenceCategory::Import),
+                    category: is_name_ref_in_import(name_ref).then_some(ReferenceCategory::Import),
                 };
                 sink(file_id, reference)
             }
@@ -787,7 +787,7 @@ impl ReferenceCategory {
     fn new(def: &Definition, r: &ast::NameRef) -> Option<ReferenceCategory> {
         // Only Locals and Fields have accesses for now.
         if !matches!(def, Definition::Local(_) | Definition::Field(_)) {
-            return is_name_ref_in_import(r).then(|| ReferenceCategory::Import);
+            return is_name_ref_in_import(r).then_some(ReferenceCategory::Import);
         }
 
         let mode = r.syntax().ancestors().find_map(|node| {
diff --git a/crates/ide-db/src/symbol_index.rs b/crates/ide-db/src/symbol_index.rs
index bfb0031277..c054cc1597 100644
--- a/crates/ide-db/src/symbol_index.rs
+++ b/crates/ide-db/src/symbol_index.rs
@@ -206,7 +206,7 @@ pub fn world_symbols(db: &RootDatabase, query: Query) -> Vec<FileSymbol> {
 }
 
 pub fn crate_symbols(db: &RootDatabase, krate: Crate, query: Query) -> Vec<FileSymbol> {
-    let _p = profile::span("crate_symbols").detail(|| format!("{:?}", query));
+    let _p = profile::span("crate_symbols").detail(|| format!("{query:?}"));
 
     let modules = krate.modules(db);
     let indices: Vec<_> = modules
diff --git a/crates/ide-db/src/syntax_helpers/format_string_exprs.rs b/crates/ide-db/src/syntax_helpers/format_string_exprs.rs
index 313346ee13..fcef71fb74 100644
--- a/crates/ide-db/src/syntax_helpers/format_string_exprs.rs
+++ b/crates/ide-db/src/syntax_helpers/format_string_exprs.rs
@@ -140,8 +140,8 @@ pub fn parse_format_exprs(input: &str) -> Result<(String, Vec<Arg>), ()> {
                         output.push_str(trimmed);
                     } else if matches!(state, State::Expr) {
                         extracted_expressions.push(Arg::Expr(trimmed.into()));
-                    } else {
-                        extracted_expressions.push(Arg::Ident(trimmed.into()));
+                    } else if matches!(state, State::Ident) {
+                        output.push_str(trimmed);
                     }
 
                     output.push(chr);
@@ -205,7 +205,7 @@ mod tests {
     fn check(input: &str, expect: &Expect) {
         let (output, exprs) = parse_format_exprs(input).unwrap_or(("-".to_string(), vec![]));
         let outcome_repr = if !exprs.is_empty() {
-            format!("{}; {}", output, with_placeholders(exprs).join(", "))
+            format!("{output}; {}", with_placeholders(exprs).join(", "))
         } else {
             output
         };
@@ -218,9 +218,9 @@ mod tests {
         let test_vector = &[
             ("no expressions", expect![["no expressions"]]),
             (r"no expressions with \$0$1", expect![r"no expressions with \\\$0\$1"]),
-            ("{expr} is {2 + 2}", expect![["{} is {}; expr, 2 + 2"]]),
-            ("{expr:?}", expect![["{:?}; expr"]]),
-            ("{expr:1$}", expect![[r"{:1\$}; expr"]]),
+            ("{expr} is {2 + 2}", expect![["{expr} is {}; 2 + 2"]]),
+            ("{expr:?}", expect![["{expr:?}"]]),
+            ("{expr:1$}", expect![[r"{expr:1\$}"]]),
             ("{:1$}", expect![[r"{:1\$}; $1"]]),
             ("{:>padding$}", expect![[r"{:>padding\$}; $1"]]),
             ("{}, {}, {0}", expect![[r"{}, {}, {0}; $1, $2"]]),
@@ -230,8 +230,8 @@ mod tests {
             ("malformed}", expect![["-"]]),
             ("{{correct", expect![["{{correct"]]),
             ("correct}}", expect![["correct}}"]]),
-            ("{correct}}}", expect![["{}}}; correct"]]),
-            ("{correct}}}}}", expect![["{}}}}}; correct"]]),
+            ("{correct}}}", expect![["{correct}}}"]]),
+            ("{correct}}}}}", expect![["{correct}}}}}"]]),
             ("{incorrect}}", expect![["-"]]),
             ("placeholders {} {}", expect![["placeholders {} {}; $1, $2"]]),
             ("mixed {} {2 + 2} {}", expect![["mixed {} {} {}; $1, 2 + 2, $2"]]),
@@ -239,7 +239,7 @@ mod tests {
                 "{SomeStruct { val_a: 0, val_b: 1 }}",
                 expect![["{}; SomeStruct { val_a: 0, val_b: 1 }"]],
             ),
-            ("{expr:?} is {2.32f64:.5}", expect![["{:?} is {:.5}; expr, 2.32f64"]]),
+            ("{expr:?} is {2.32f64:.5}", expect![["{expr:?} is {:.5}; 2.32f64"]]),
             (
                 "{SomeStruct { val_a: 0, val_b: 1 }:?}",
                 expect![["{:?}; SomeStruct { val_a: 0, val_b: 1 }"]],
@@ -262,8 +262,6 @@ mod tests {
                 .unwrap()
                 .1,
             vec![
-                Arg::Ident("_ident".to_owned()),
-                Arg::Ident("r#raw_ident".to_owned()),
                 Arg::Expr("expr.obj".to_owned()),
                 Arg::Expr("name {thing: 42}".to_owned()),
                 Arg::Placeholder
diff --git a/crates/ide-db/src/syntax_helpers/node_ext.rs b/crates/ide-db/src/syntax_helpers/node_ext.rs
index 39710b8f13..a34dc1b695 100644
--- a/crates/ide-db/src/syntax_helpers/node_ext.rs
+++ b/crates/ide-db/src/syntax_helpers/node_ext.rs
@@ -173,7 +173,8 @@ pub fn walk_pat(pat: &ast::Pat, cb: &mut dyn FnMut(ast::Pat)) {
 }
 
 /// Preorder walk all the type's sub types.
-pub fn walk_ty(ty: &ast::Type, cb: &mut dyn FnMut(ast::Type)) {
+// FIXME: Make the control flow more proper
+pub fn walk_ty(ty: &ast::Type, cb: &mut dyn FnMut(ast::Type) -> bool) {
     let mut preorder = ty.syntax().preorder();
     while let Some(event) = preorder.next() {
         let node = match event {
@@ -184,10 +185,12 @@ pub fn walk_ty(ty: &ast::Type, cb: &mut dyn FnMut(ast::Type)) {
         match ast::Type::cast(node) {
             Some(ty @ ast::Type::MacroType(_)) => {
                 preorder.skip_subtree();
-                cb(ty)
+                cb(ty);
             }
             Some(ty) => {
-                cb(ty);
+                if cb(ty) {
+                    preorder.skip_subtree();
+                }
             }
             // skip const args
             None if ast::ConstArg::can_cast(kind) => {
@@ -252,6 +255,11 @@ pub fn is_pattern_cond(expr: ast::Expr) -> bool {
 /// Note that modifying the tree while iterating it will cause undefined iteration which might
 /// potentially results in an out of bounds panic.
 pub fn for_each_tail_expr(expr: &ast::Expr, cb: &mut dyn FnMut(&ast::Expr)) {
+    let walk_loop = |cb: &mut dyn FnMut(&ast::Expr), label, body: Option<ast::BlockExpr>| {
+        for_each_break_expr(label, body.and_then(|it| it.stmt_list()), &mut |b| {
+            cb(&ast::Expr::BreakExpr(b))
+        })
+    };
     match expr {
         ast::Expr::BlockExpr(b) => {
             match b.modifier() {
@@ -291,11 +299,9 @@ pub fn for_each_tail_expr(expr: &ast::Expr, cb: &mut dyn FnMut(&ast::Expr)) {
                 }
             }
         }
-        ast::Expr::LoopExpr(l) => {
-            for_each_break_expr(l.label(), l.loop_body().and_then(|it| it.stmt_list()), &mut |b| {
-                cb(&ast::Expr::BreakExpr(b))
-            })
-        }
+        ast::Expr::LoopExpr(l) => walk_loop(cb, l.label(), l.loop_body()),
+        ast::Expr::WhileExpr(w) => walk_loop(cb, w.label(), w.loop_body()),
+        ast::Expr::ForExpr(f) => walk_loop(cb, f.label(), f.loop_body()),
         ast::Expr::MatchExpr(m) => {
             if let Some(arms) = m.match_arm_list() {
                 arms.arms().filter_map(|arm| arm.expr()).for_each(|e| for_each_tail_expr(&e, cb));
@@ -311,7 +317,6 @@ pub fn for_each_tail_expr(expr: &ast::Expr, cb: &mut dyn FnMut(&ast::Expr)) {
         | ast::Expr::ClosureExpr(_)
         | ast::Expr::ContinueExpr(_)
         | ast::Expr::FieldExpr(_)
-        | ast::Expr::ForExpr(_)
         | ast::Expr::IndexExpr(_)
         | ast::Expr::Literal(_)
         | ast::Expr::MacroExpr(_)
@@ -325,10 +330,10 @@ pub fn for_each_tail_expr(expr: &ast::Expr, cb: &mut dyn FnMut(&ast::Expr)) {
         | ast::Expr::ReturnExpr(_)
         | ast::Expr::TryExpr(_)
         | ast::Expr::TupleExpr(_)
-        | ast::Expr::WhileExpr(_)
         | ast::Expr::LetExpr(_)
         | ast::Expr::UnderscoreExpr(_)
-        | ast::Expr::YieldExpr(_) => cb(expr),
+        | ast::Expr::YieldExpr(_)
+        | ast::Expr::YeetExpr(_) => cb(expr),
     }
 }
 
@@ -447,7 +452,7 @@ pub fn parse_tt_as_comma_sep_paths(input: ast::TokenTree) -> Option<Vec<ast::Pat
     let input_expressions = tokens.group_by(|tok| tok.kind() == T![,]);
     let paths = input_expressions
         .into_iter()
-        .filter_map(|(is_sep, group)| (!is_sep).then(|| group))
+        .filter_map(|(is_sep, group)| (!is_sep).then_some(group))
         .filter_map(|mut tokens| {
             syntax::hacks::parse_expr_from_str(&tokens.join("")).and_then(|expr| match expr {
                 ast::Expr::PathExpr(it) => it.path(),
diff --git a/crates/ide-db/src/test_data/test_symbol_index_collection.txt b/crates/ide-db/src/test_data/test_symbol_index_collection.txt
index 2f531ca0c7..8c11408dec 100644
--- a/crates/ide-db/src/test_data/test_symbol_index_collection.txt
+++ b/crates/ide-db/src/test_data/test_symbol_index_collection.txt
@@ -14,11 +14,7 @@
                 name: "Alias",
                 loc: DeclarationLocation {
                     hir_file_id: HirFileId(
-                        FileId(
-                            FileId(
-                                0,
-                            ),
-                        ),
+                        0,
                     ),
                     ptr: SyntaxNodePtr {
                         kind: TYPE_ALIAS,
@@ -36,11 +32,7 @@
                 name: "CONST",
                 loc: DeclarationLocation {
                     hir_file_id: HirFileId(
-                        FileId(
-                            FileId(
-                                0,
-                            ),
-                        ),
+                        0,
                     ),
                     ptr: SyntaxNodePtr {
                         kind: CONST,
@@ -58,11 +50,7 @@
                 name: "CONST_WITH_INNER",
                 loc: DeclarationLocation {
                     hir_file_id: HirFileId(
-                        FileId(
-                            FileId(
-                                0,
-                            ),
-                        ),
+                        0,
                     ),
                     ptr: SyntaxNodePtr {
                         kind: CONST,
@@ -80,11 +68,7 @@
                 name: "Enum",
                 loc: DeclarationLocation {
                     hir_file_id: HirFileId(
-                        FileId(
-                            FileId(
-                                0,
-                            ),
-                        ),
+                        0,
                     ),
                     ptr: SyntaxNodePtr {
                         kind: ENUM,
@@ -102,11 +86,7 @@
                 name: "Macro",
                 loc: DeclarationLocation {
                     hir_file_id: HirFileId(
-                        FileId(
-                            FileId(
-                                0,
-                            ),
-                        ),
+                        0,
                     ),
                     ptr: SyntaxNodePtr {
                         kind: MACRO_DEF,
@@ -124,11 +104,7 @@
                 name: "STATIC",
                 loc: DeclarationLocation {
                     hir_file_id: HirFileId(
-                        FileId(
-                            FileId(
-                                0,
-                            ),
-                        ),
+                        0,
                     ),
                     ptr: SyntaxNodePtr {
                         kind: STATIC,
@@ -146,11 +122,7 @@
                 name: "Struct",
                 loc: DeclarationLocation {
                     hir_file_id: HirFileId(
-                        FileId(
-                            FileId(
-                                0,
-                            ),
-                        ),
+                        0,
                     ),
                     ptr: SyntaxNodePtr {
                         kind: STRUCT,
@@ -168,13 +140,7 @@
                 name: "StructFromMacro",
                 loc: DeclarationLocation {
                     hir_file_id: HirFileId(
-                        MacroFile(
-                            MacroFile {
-                                macro_call_id: MacroCallId(
-                                    0,
-                                ),
-                            },
-                        ),
+                        2147483648,
                     ),
                     ptr: SyntaxNodePtr {
                         kind: STRUCT,
@@ -192,11 +158,7 @@
                 name: "StructInFn",
                 loc: DeclarationLocation {
                     hir_file_id: HirFileId(
-                        FileId(
-                            FileId(
-                                0,
-                            ),
-                        ),
+                        0,
                     ),
                     ptr: SyntaxNodePtr {
                         kind: STRUCT,
@@ -216,11 +178,7 @@
                 name: "StructInNamedConst",
                 loc: DeclarationLocation {
                     hir_file_id: HirFileId(
-                        FileId(
-                            FileId(
-                                0,
-                            ),
-                        ),
+                        0,
                     ),
                     ptr: SyntaxNodePtr {
                         kind: STRUCT,
@@ -240,11 +198,7 @@
                 name: "StructInUnnamedConst",
                 loc: DeclarationLocation {
                     hir_file_id: HirFileId(
-                        FileId(
-                            FileId(
-                                0,
-                            ),
-                        ),
+                        0,
                     ),
                     ptr: SyntaxNodePtr {
                         kind: STRUCT,
@@ -262,11 +216,7 @@
                 name: "Trait",
                 loc: DeclarationLocation {
                     hir_file_id: HirFileId(
-                        FileId(
-                            FileId(
-                                0,
-                            ),
-                        ),
+                        0,
                     ),
                     ptr: SyntaxNodePtr {
                         kind: TRAIT,
@@ -284,11 +234,7 @@
                 name: "Union",
                 loc: DeclarationLocation {
                     hir_file_id: HirFileId(
-                        FileId(
-                            FileId(
-                                0,
-                            ),
-                        ),
+                        0,
                     ),
                     ptr: SyntaxNodePtr {
                         kind: UNION,
@@ -306,11 +252,7 @@
                 name: "a_mod",
                 loc: DeclarationLocation {
                     hir_file_id: HirFileId(
-                        FileId(
-                            FileId(
-                                0,
-                            ),
-                        ),
+                        0,
                     ),
                     ptr: SyntaxNodePtr {
                         kind: MODULE,
@@ -328,11 +270,7 @@
                 name: "b_mod",
                 loc: DeclarationLocation {
                     hir_file_id: HirFileId(
-                        FileId(
-                            FileId(
-                                0,
-                            ),
-                        ),
+                        0,
                     ),
                     ptr: SyntaxNodePtr {
                         kind: MODULE,
@@ -350,11 +288,7 @@
                 name: "define_struct",
                 loc: DeclarationLocation {
                     hir_file_id: HirFileId(
-                        FileId(
-                            FileId(
-                                0,
-                            ),
-                        ),
+                        0,
                     ),
                     ptr: SyntaxNodePtr {
                         kind: MACRO_RULES,
@@ -372,11 +306,7 @@
                 name: "impl_fn",
                 loc: DeclarationLocation {
                     hir_file_id: HirFileId(
-                        FileId(
-                            FileId(
-                                0,
-                            ),
-                        ),
+                        0,
                     ),
                     ptr: SyntaxNodePtr {
                         kind: FN,
@@ -394,11 +324,7 @@
                 name: "macro_rules_macro",
                 loc: DeclarationLocation {
                     hir_file_id: HirFileId(
-                        FileId(
-                            FileId(
-                                0,
-                            ),
-                        ),
+                        0,
                     ),
                     ptr: SyntaxNodePtr {
                         kind: MACRO_RULES,
@@ -416,11 +342,7 @@
                 name: "main",
                 loc: DeclarationLocation {
                     hir_file_id: HirFileId(
-                        FileId(
-                            FileId(
-                                0,
-                            ),
-                        ),
+                        0,
                     ),
                     ptr: SyntaxNodePtr {
                         kind: FN,
@@ -438,11 +360,7 @@
                 name: "trait_fn",
                 loc: DeclarationLocation {
                     hir_file_id: HirFileId(
-                        FileId(
-                            FileId(
-                                0,
-                            ),
-                        ),
+                        0,
                     ),
                     ptr: SyntaxNodePtr {
                         kind: FN,
@@ -475,11 +393,7 @@
                 name: "StructInModA",
                 loc: DeclarationLocation {
                     hir_file_id: HirFileId(
-                        FileId(
-                            FileId(
-                                0,
-                            ),
-                        ),
+                        0,
                     ),
                     ptr: SyntaxNodePtr {
                         kind: STRUCT,
@@ -510,11 +424,7 @@
                 name: "StructInModB",
                 loc: DeclarationLocation {
                     hir_file_id: HirFileId(
-                        FileId(
-                            FileId(
-                                1,
-                            ),
-                        ),
+                        1,
                     ),
                     ptr: SyntaxNodePtr {
                         kind: STRUCT,
diff --git a/crates/ide-db/src/tests/sourcegen_lints.rs b/crates/ide-db/src/tests/sourcegen_lints.rs
index 5042f6d815..c7d5f3613d 100644
--- a/crates/ide-db/src/tests/sourcegen_lints.rs
+++ b/crates/ide-db/src/tests/sourcegen_lints.rs
@@ -241,9 +241,9 @@ fn generate_descriptor_clippy(buf: &mut String, path: &Path) {
 
     buf.push_str(r#"pub const CLIPPY_LINT_GROUPS: &[LintGroup] = &["#);
     for (id, children) in clippy_groups {
-        let children = children.iter().map(|id| format!("clippy::{}", id)).collect::<Vec<_>>();
+        let children = children.iter().map(|id| format!("clippy::{id}")).collect::<Vec<_>>();
         if !children.is_empty() {
-            let lint_ident = format!("clippy::{}", id);
+            let lint_ident = format!("clippy::{id}");
             let description = format!("lint group for: {}", children.iter().join(", "));
             push_lint_group(buf, &lint_ident, &description, &children);
         }
@@ -273,7 +273,7 @@ fn push_lint_group(buf: &mut String, label: &str, description: &str, children: &
 
     push_lint_completion(buf, label, description);
 
-    let children = format!("&[{}]", children.iter().map(|it| format!("\"{}\"", it)).join(", "));
+    let children = format!("&[{}]", children.iter().map(|it| format!("\"{it}\"")).join(", "));
     format_to!(
         buf,
         r###"
diff --git a/crates/ide-diagnostics/src/handlers/break_outside_of_loop.rs b/crates/ide-diagnostics/src/handlers/break_outside_of_loop.rs
index 0c92e706b3..10e637979f 100644
--- a/crates/ide-diagnostics/src/handlers/break_outside_of_loop.rs
+++ b/crates/ide-diagnostics/src/handlers/break_outside_of_loop.rs
@@ -37,35 +37,13 @@ fn foo() {
         );
     }
 
-    #[test]
-    fn try_blocks_are_borders() {
-        check_diagnostics(
-            r#"
-fn foo() {
-    'a: loop {
-        try {
-                break;
-              //^^^^^ error: break outside of loop
-                break 'a;
-              //^^^^^^^^ error: break outside of loop
-                continue;
-              //^^^^^^^^ error: continue outside of loop
-                continue 'a;
-              //^^^^^^^^^^^ error: continue outside of loop
-        };
-    }
-}
-"#,
-        );
-    }
-
     #[test]
     fn async_blocks_are_borders() {
         check_diagnostics(
             r#"
 fn foo() {
     'a: loop {
-        try {
+        async {
                 break;
               //^^^^^ error: break outside of loop
                 break 'a;
@@ -87,7 +65,7 @@ fn foo() {
             r#"
 fn foo() {
     'a: loop {
-        try {
+        || {
                 break;
               //^^^^^ error: break outside of loop
                 break 'a;
@@ -121,6 +99,24 @@ fn foo() {
         );
     }
 
+    #[test]
+    fn try_blocks_pass_through() {
+        check_diagnostics(
+            r#"
+fn foo() {
+    'a: loop {
+        try {
+                break;
+                break 'a;
+                continue;
+                continue 'a;
+        };
+    }
+}
+"#,
+        );
+    }
+
     #[test]
     fn label_blocks() {
         check_diagnostics(
diff --git a/crates/ide-diagnostics/src/handlers/json_is_not_rust.rs b/crates/ide-diagnostics/src/handlers/json_is_not_rust.rs
index 3034295196..e8df6dcf28 100644
--- a/crates/ide-diagnostics/src/handlers/json_is_not_rust.rs
+++ b/crates/ide-diagnostics/src/handlers/json_is_not_rust.rs
@@ -125,7 +125,7 @@ pub(crate) fn json_in_items(
                         .severity(Severity::WeakWarning)
                         .with_fixes(Some(vec![{
                             let mut scb = SourceChangeBuilder::new(file_id);
-                            let scope = match import_scope.clone() {
+                            let scope = match import_scope {
                                 ImportScope::File(it) => ImportScope::File(scb.make_mut(it)),
                                 ImportScope::Module(it) => ImportScope::Module(scb.make_mut(it)),
                                 ImportScope::Block(it) => ImportScope::Block(scb.make_mut(it)),
diff --git a/crates/ide-diagnostics/src/handlers/mismatched_arg_count.rs b/crates/ide-diagnostics/src/handlers/mismatched_arg_count.rs
index 5f8b3e543b..c5db8c3741 100644
--- a/crates/ide-diagnostics/src/handlers/mismatched_arg_count.rs
+++ b/crates/ide-diagnostics/src/handlers/mismatched_arg_count.rs
@@ -13,7 +13,7 @@ pub(crate) fn mismatched_arg_count(
     d: &hir::MismatchedArgCount,
 ) -> Diagnostic {
     let s = if d.expected == 1 { "" } else { "s" };
-    let message = format!("expected {} argument{}, found {}", d.expected, s, d.found);
+    let message = format!("expected {} argument{s}, found {}", d.expected, d.found);
     Diagnostic::new("mismatched-arg-count", message, invalid_args_range(ctx, d))
 }
 
diff --git a/crates/ide-diagnostics/src/handlers/missing_fields.rs b/crates/ide-diagnostics/src/handlers/missing_fields.rs
index 7f140eb6a7..43af4d4f16 100644
--- a/crates/ide-diagnostics/src/handlers/missing_fields.rs
+++ b/crates/ide-diagnostics/src/handlers/missing_fields.rs
@@ -128,9 +128,9 @@ fn fixes(ctx: &DiagnosticsContext<'_>, d: &hir::MissingFields) -> Option<Vec<Ass
                         )?;
 
                         use_trivial_constructor(
-                            &ctx.sema.db,
+                            ctx.sema.db,
                             ide_db::helpers::mod_path_to_ast(&type_path),
-                            &ty,
+                            ty,
                         )
                     })();
 
diff --git a/crates/ide-diagnostics/src/handlers/missing_unsafe.rs b/crates/ide-diagnostics/src/handlers/missing_unsafe.rs
index 7acd9228a8..ea1ea5a216 100644
--- a/crates/ide-diagnostics/src/handlers/missing_unsafe.rs
+++ b/crates/ide-diagnostics/src/handlers/missing_unsafe.rs
@@ -86,6 +86,7 @@ fn main() {
         check_diagnostics(
             r#"
 extern "rust-intrinsic" {
+    #[rustc_safe_intrinsic]
     pub fn bitreverse(x: u32) -> u32; // Safe intrinsic
     pub fn floorf32(x: f32) -> f32; // Unsafe intrinsic
 }
diff --git a/crates/ide-diagnostics/src/handlers/no_such_field.rs b/crates/ide-diagnostics/src/handlers/no_such_field.rs
index d8f2a9de98..8da04e628d 100644
--- a/crates/ide-diagnostics/src/handlers/no_such_field.rs
+++ b/crates/ide-diagnostics/src/handlers/no_such_field.rs
@@ -68,7 +68,7 @@ fn missing_record_expr_field_fixes(
     }
     let new_field = make::record_field(
         None,
-        make::name(&record_expr_field.field_name()?.ident_token()?.text()),
+        make::name(record_expr_field.field_name()?.ident_token()?.text()),
         make::ty(&new_field_type.display_source_code(sema.db, module.into()).ok()?),
     );
 
@@ -78,13 +78,13 @@ fn missing_record_expr_field_fixes(
 
     let mut new_field = new_field.to_string();
     if usage_file_id != def_file_id {
-        new_field = format!("pub(crate) {}", new_field);
+        new_field = format!("pub(crate) {new_field}");
     }
-    new_field = format!("\n{}{}", indent, new_field);
+    new_field = format!("\n{indent}{new_field}");
 
     let needs_comma = !last_field_syntax.to_string().ends_with(',');
     if needs_comma {
-        new_field = format!(",{}", new_field);
+        new_field = format!(",{new_field}");
     }
 
     let source_change = SourceChange::from_text_edit(
diff --git a/crates/ide-diagnostics/src/handlers/private_assoc_item.rs b/crates/ide-diagnostics/src/handlers/private_assoc_item.rs
new file mode 100644
index 0000000000..b363a516dd
--- /dev/null
+++ b/crates/ide-diagnostics/src/handlers/private_assoc_item.rs
@@ -0,0 +1,124 @@
+use either::Either;
+
+use crate::{Diagnostic, DiagnosticsContext};
+
+// Diagnostic: private-assoc-item
+//
+// This diagnostic is triggered if the referenced associated item is not visible from the current
+// module.
+pub(crate) fn private_assoc_item(
+    ctx: &DiagnosticsContext<'_>,
+    d: &hir::PrivateAssocItem,
+) -> Diagnostic {
+    // FIXME: add quickfix
+    let name = match d.item.name(ctx.sema.db) {
+        Some(name) => format!("`{}` ", name),
+        None => String::new(),
+    };
+    Diagnostic::new(
+        "private-assoc-item",
+        format!(
+            "{} {}is private",
+            match d.item {
+                hir::AssocItem::Function(_) => "function",
+                hir::AssocItem::Const(_) => "const",
+                hir::AssocItem::TypeAlias(_) => "type alias",
+            },
+            name,
+        ),
+        ctx.sema
+            .diagnostics_display_range(d.expr_or_pat.clone().map(|it| match it {
+                Either::Left(it) => it.into(),
+                Either::Right(it) => match it {
+                    Either::Left(it) => it.into(),
+                    Either::Right(it) => it.into(),
+                },
+            }))
+            .range,
+    )
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::tests::check_diagnostics;
+
+    #[test]
+    fn private_method() {
+        check_diagnostics(
+            r#"
+mod module {
+    pub struct Struct;
+    impl Struct {
+        fn method(&self) {}
+    }
+}
+fn main(s: module::Struct) {
+    s.method();
+  //^^^^^^^^^^ error: function `method` is private
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn private_func() {
+        check_diagnostics(
+            r#"
+mod module {
+    pub struct Struct;
+    impl Struct {
+        fn func() {}
+    }
+}
+fn main() {
+    module::Struct::func();
+  //^^^^^^^^^^^^^^^^^^^^ error: function `func` is private
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn private_const() {
+        check_diagnostics(
+            r#"
+mod module {
+    pub struct Struct;
+    impl Struct {
+        const CONST: u32 = 0;
+    }
+}
+fn main() {
+    module::Struct::CONST;
+  //^^^^^^^^^^^^^^^^^^^^^ error: const `CONST` is private
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn private_but_shadowed_in_deref() {
+        check_diagnostics(
+            r#"
+//- minicore: deref
+mod module {
+    pub struct Struct { field: Inner }
+    pub struct Inner;
+    impl core::ops::Deref for Struct {
+        type Target = Inner;
+        fn deref(&self) -> &Inner { &self.field }
+    }
+    impl Struct {
+        fn method(&self) {}
+    }
+    impl Inner {
+        pub fn method(&self) {}
+    }
+}
+fn main(s: module::Struct) {
+    s.method();
+}
+"#,
+        );
+    }
+}
diff --git a/crates/ide-diagnostics/src/handlers/private_field.rs b/crates/ide-diagnostics/src/handlers/private_field.rs
new file mode 100644
index 0000000000..e630ae3686
--- /dev/null
+++ b/crates/ide-diagnostics/src/handlers/private_field.rs
@@ -0,0 +1,68 @@
+use crate::{Diagnostic, DiagnosticsContext};
+
+// Diagnostic: private-field
+//
+// This diagnostic is triggered if the accessed field is not visible from the current module.
+pub(crate) fn private_field(ctx: &DiagnosticsContext<'_>, d: &hir::PrivateField) -> Diagnostic {
+    // FIXME: add quickfix
+    Diagnostic::new(
+        "private-field",
+        format!(
+            "field `{}` of `{}` is private",
+            d.field.name(ctx.sema.db),
+            d.field.parent_def(ctx.sema.db).name(ctx.sema.db)
+        ),
+        ctx.sema.diagnostics_display_range(d.expr.clone().map(|it| it.into())).range,
+    )
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::tests::check_diagnostics;
+
+    #[test]
+    fn private_field() {
+        check_diagnostics(
+            r#"
+mod module { pub struct Struct { field: u32 } }
+fn main(s: module::Struct) {
+    s.field;
+  //^^^^^^^ error: field `field` of `Struct` is private
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn private_tuple_field() {
+        check_diagnostics(
+            r#"
+mod module { pub struct Struct(u32); }
+fn main(s: module::Struct) {
+    s.0;
+  //^^^ error: field `0` of `Struct` is private
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn private_but_shadowed_in_deref() {
+        check_diagnostics(
+            r#"
+//- minicore: deref
+mod module {
+    pub struct Struct { field: Inner }
+    pub struct Inner { pub field: u32 }
+    impl core::ops::Deref for Struct {
+        type Target = Inner;
+        fn deref(&self) -> &Inner { &self.field }
+    }
+}
+fn main(s: module::Struct) {
+    s.field;
+}
+"#,
+        );
+    }
+}
diff --git a/crates/ide-diagnostics/src/handlers/type_mismatch.rs b/crates/ide-diagnostics/src/handlers/type_mismatch.rs
index 62c69f90ba..2adae165e4 100644
--- a/crates/ide-diagnostics/src/handlers/type_mismatch.rs
+++ b/crates/ide-diagnostics/src/handlers/type_mismatch.rs
@@ -106,11 +106,11 @@ fn add_missing_ok_or_some(
     }
 
     let mut builder = TextEdit::builder();
-    builder.insert(expr.syntax().text_range().start(), format!("{}(", variant_name));
+    builder.insert(expr.syntax().text_range().start(), format!("{variant_name}("));
     builder.insert(expr.syntax().text_range().end(), ")".to_string());
     let source_change =
         SourceChange::from_text_edit(d.expr.file_id.original_file(ctx.sema.db), builder.finish());
-    let name = format!("Wrap in {}", variant_name);
+    let name = format!("Wrap in {variant_name}");
     acc.push(fix("wrap_in_constructor", &name, source_change, expr_range));
     Some(())
 }
diff --git a/crates/ide-diagnostics/src/handlers/unlinked_file.rs b/crates/ide-diagnostics/src/handlers/unlinked_file.rs
index c626932f19..be70f0ac4f 100644
--- a/crates/ide-diagnostics/src/handlers/unlinked_file.rs
+++ b/crates/ide-diagnostics/src/handlers/unlinked_file.rs
@@ -64,7 +64,7 @@ fn fixes(ctx: &DiagnosticsContext<'_>, file_id: FileId) -> Option<Vec<Assist>> {
         // `submod/bla.rs` -> `submod.rs`
         let parent_mod = (|| {
             let (name, _) = parent.name_and_extension()?;
-            parent.parent()?.join(&format!("{}.rs", name))
+            parent.parent()?.join(&format!("{name}.rs"))
         })();
         paths.extend(parent_mod);
         paths
@@ -99,8 +99,8 @@ fn make_fixes(
         matches!(item, ast::Item::Module(m) if m.item_list().is_none())
     }
 
-    let mod_decl = format!("mod {};", new_mod_name);
-    let pub_mod_decl = format!("pub mod {};", new_mod_name);
+    let mod_decl = format!("mod {new_mod_name};");
+    let pub_mod_decl = format!("pub mod {new_mod_name};");
 
     let ast: ast::SourceFile = db.parse(parent_file_id).tree();
 
@@ -125,8 +125,8 @@ fn make_fixes(
         Some(last) => {
             cov_mark::hit!(unlinked_file_append_to_existing_mods);
             let offset = last.syntax().text_range().end();
-            mod_decl_builder.insert(offset, format!("\n{}", mod_decl));
-            pub_mod_decl_builder.insert(offset, format!("\n{}", pub_mod_decl));
+            mod_decl_builder.insert(offset, format!("\n{mod_decl}"));
+            pub_mod_decl_builder.insert(offset, format!("\n{pub_mod_decl}"));
         }
         None => {
             // Prepend before the first item in the file.
@@ -134,15 +134,15 @@ fn make_fixes(
                 Some(item) => {
                     cov_mark::hit!(unlinked_file_prepend_before_first_item);
                     let offset = item.syntax().text_range().start();
-                    mod_decl_builder.insert(offset, format!("{}\n\n", mod_decl));
-                    pub_mod_decl_builder.insert(offset, format!("{}\n\n", pub_mod_decl));
+                    mod_decl_builder.insert(offset, format!("{mod_decl}\n\n"));
+                    pub_mod_decl_builder.insert(offset, format!("{pub_mod_decl}\n\n"));
                 }
                 None => {
                     // No items in the file, so just append at the end.
                     cov_mark::hit!(unlinked_file_empty_file);
                     let offset = ast.syntax().text_range().end();
-                    mod_decl_builder.insert(offset, format!("{}\n", mod_decl));
-                    pub_mod_decl_builder.insert(offset, format!("{}\n", pub_mod_decl));
+                    mod_decl_builder.insert(offset, format!("{mod_decl}\n"));
+                    pub_mod_decl_builder.insert(offset, format!("{pub_mod_decl}\n"));
                 }
             }
         }
@@ -152,13 +152,13 @@ fn make_fixes(
     Some(vec![
         fix(
             "add_mod_declaration",
-            &format!("Insert `{}`", mod_decl),
+            &format!("Insert `{mod_decl}`"),
             SourceChange::from_text_edit(parent_file_id, mod_decl_builder.finish()),
             trigger_range,
         ),
         fix(
             "add_pub_mod_declaration",
-            &format!("Insert `{}`", pub_mod_decl),
+            &format!("Insert `{pub_mod_decl}`"),
             SourceChange::from_text_edit(parent_file_id, pub_mod_decl_builder.finish()),
             trigger_range,
         ),
diff --git a/crates/ide-diagnostics/src/handlers/unresolved_macro_call.rs b/crates/ide-diagnostics/src/handlers/unresolved_macro_call.rs
index 87531f4acf..1a5efff2c0 100644
--- a/crates/ide-diagnostics/src/handlers/unresolved_macro_call.rs
+++ b/crates/ide-diagnostics/src/handlers/unresolved_macro_call.rs
@@ -13,7 +13,7 @@ pub(crate) fn unresolved_macro_call(
     let bang = if d.is_bang { "!" } else { "" };
     Diagnostic::new(
         "unresolved-macro-call",
-        format!("unresolved macro `{}{}`", d.path, bang),
+        format!("unresolved macro `{}{bang}`", d.path),
         display_range,
     )
     .experimental()
diff --git a/crates/ide-diagnostics/src/handlers/unresolved_module.rs b/crates/ide-diagnostics/src/handlers/unresolved_module.rs
index b8f2a9e94a..91395f1d84 100644
--- a/crates/ide-diagnostics/src/handlers/unresolved_module.rs
+++ b/crates/ide-diagnostics/src/handlers/unresolved_module.rs
@@ -16,7 +16,7 @@ pub(crate) fn unresolved_module(
         "unresolved-module",
         match &*d.candidates {
             [] => "unresolved module".to_string(),
-            [candidate] => format!("unresolved module, can't find module file: {}", candidate),
+            [candidate] => format!("unresolved module, can't find module file: {candidate}"),
             [candidates @ .., last] => {
                 format!(
                     "unresolved module, can't find module file: {}, or {}",
diff --git a/crates/ide-diagnostics/src/handlers/unresolved_proc_macro.rs b/crates/ide-diagnostics/src/handlers/unresolved_proc_macro.rs
index 23818d883f..b2ed19104e 100644
--- a/crates/ide-diagnostics/src/handlers/unresolved_proc_macro.rs
+++ b/crates/ide-diagnostics/src/handlers/unresolved_proc_macro.rs
@@ -26,7 +26,7 @@ pub(crate) fn unresolved_proc_macro(
     };
 
     let message = match &d.macro_name {
-        Some(name) => format!("proc macro `{}` not expanded", name),
+        Some(name) => format!("proc macro `{name}` not expanded"),
         None => "proc macro not expanded".to_string(),
     };
     let severity = if config_enabled { Severity::Error } else { Severity::WeakWarning };
diff --git a/crates/ide-diagnostics/src/lib.rs b/crates/ide-diagnostics/src/lib.rs
index d81e36a1f8..64ba08ac88 100644
--- a/crates/ide-diagnostics/src/lib.rs
+++ b/crates/ide-diagnostics/src/lib.rs
@@ -37,6 +37,8 @@ mod handlers {
     pub(crate) mod missing_match_arms;
     pub(crate) mod missing_unsafe;
     pub(crate) mod no_such_field;
+    pub(crate) mod private_assoc_item;
+    pub(crate) mod private_field;
     pub(crate) mod replace_filter_map_next_with_find_map;
     pub(crate) mod type_mismatch;
     pub(crate) mod unimplemented_builtin_macro;
@@ -218,7 +220,7 @@ pub fn diagnostics(
     // [#34344] Only take first 128 errors to prevent slowing down editor/ide, the number 128 is chosen arbitrarily.
     res.extend(
         parse.errors().iter().take(128).map(|err| {
-            Diagnostic::new("syntax-error", format!("Syntax Error: {}", err), err.range())
+            Diagnostic::new("syntax-error", format!("Syntax Error: {err}"), err.range())
         }),
     );
 
@@ -227,7 +229,7 @@ pub fn diagnostics(
     for node in parse.syntax().descendants() {
         handlers::useless_braces::useless_braces(&mut res, file_id, &node);
         handlers::field_shorthand::field_shorthand(&mut res, file_id, &node);
-        handlers::json_is_not_rust::json_in_items(&sema, &mut res, file_id, &node, &config);
+        handlers::json_is_not_rust::json_in_items(&sema, &mut res, file_id, &node, config);
     }
 
     let module = sema.to_module_def(file_id);
@@ -254,6 +256,8 @@ pub fn diagnostics(
             AnyDiagnostic::MissingMatchArms(d) => handlers::missing_match_arms::missing_match_arms(&ctx, &d),
             AnyDiagnostic::MissingUnsafe(d) => handlers::missing_unsafe::missing_unsafe(&ctx, &d),
             AnyDiagnostic::NoSuchField(d) => handlers::no_such_field::no_such_field(&ctx, &d),
+            AnyDiagnostic::PrivateAssocItem(d) => handlers::private_assoc_item::private_assoc_item(&ctx, &d),
+            AnyDiagnostic::PrivateField(d) => handlers::private_field::private_field(&ctx, &d),
             AnyDiagnostic::ReplaceFilterMapNextWithFindMap(d) => handlers::replace_filter_map_next_with_find_map::replace_filter_map_next_with_find_map(&ctx, &d),
             AnyDiagnostic::TypeMismatch(d) => handlers::type_mismatch::type_mismatch(&ctx, &d),
             AnyDiagnostic::UnimplementedBuiltinMacro(d) => handlers::unimplemented_builtin_macro::unimplemented_builtin_macro(&ctx, &d),
diff --git a/crates/ide-diagnostics/src/tests.rs b/crates/ide-diagnostics/src/tests.rs
index 729619cfde..afa641c733 100644
--- a/crates/ide-diagnostics/src/tests.rs
+++ b/crates/ide-diagnostics/src/tests.rs
@@ -75,7 +75,7 @@ pub(crate) fn check_no_fix(ra_fixture: &str) {
     )
     .pop()
     .unwrap();
-    assert!(diagnostic.fixes.is_none(), "got a fix when none was expected: {:?}", diagnostic);
+    assert!(diagnostic.fixes.is_none(), "got a fix when none was expected: {diagnostic:?}");
 }
 
 pub(crate) fn check_expect(ra_fixture: &str, expect: Expect) {
@@ -102,7 +102,7 @@ pub(crate) fn check_diagnostics_with_config(config: DiagnosticsConfig, ra_fixtur
     for file_id in files {
         let diagnostics = super::diagnostics(&db, &config, &AssistResolveStrategy::All, file_id);
 
-        let expected = extract_annotations(&*db.file_text(file_id));
+        let expected = extract_annotations(&db.file_text(file_id));
         let mut actual = diagnostics
             .into_iter()
             .map(|d| {
diff --git a/crates/ide-diagnostics/src/tests/sourcegen.rs b/crates/ide-diagnostics/src/tests/sourcegen.rs
index ec6558a46e..9e7fcfc590 100644
--- a/crates/ide-diagnostics/src/tests/sourcegen.rs
+++ b/crates/ide-diagnostics/src/tests/sourcegen.rs
@@ -11,7 +11,7 @@ fn sourcegen_diagnostic_docs() {
         diagnostics.into_iter().map(|it| it.to_string()).collect::<Vec<_>>().join("\n\n");
     let contents = sourcegen::add_preamble("sourcegen_diagnostic_docs", contents);
     let dst = project_root().join("docs/user/generated_diagnostic.adoc");
-    fs::write(&dst, &contents).unwrap();
+    fs::write(dst, contents).unwrap();
 }
 
 #[derive(Debug)]
@@ -39,7 +39,7 @@ impl Diagnostic {
             for block in comment_blocks {
                 let id = block.id;
                 if let Err(msg) = is_valid_diagnostic_name(&id) {
-                    panic!("invalid diagnostic name: {:?}:\n  {}", id, msg)
+                    panic!("invalid diagnostic name: {id:?}:\n  {msg}")
                 }
                 let doc = block.contents.join("\n");
                 let location = sourcegen::Location { file: path.clone(), line: block.line };
diff --git a/crates/ide-ssr/src/parsing.rs b/crates/ide-ssr/src/parsing.rs
index f6220b928a..d78d009681 100644
--- a/crates/ide-ssr/src/parsing.rs
+++ b/crates/ide-ssr/src/parsing.rs
@@ -352,7 +352,7 @@ impl NodeKind {
 impl Placeholder {
     fn new(name: SmolStr, constraints: Vec<Constraint>) -> Self {
         Self {
-            stand_in_name: format!("__placeholder_{}", name),
+            stand_in_name: format!("__placeholder_{name}"),
             constraints,
             ident: Var(name.to_string()),
         }
diff --git a/crates/ide-ssr/src/tests.rs b/crates/ide-ssr/src/tests.rs
index 1ecb7aa9aa..61698fca80 100644
--- a/crates/ide-ssr/src/tests.rs
+++ b/crates/ide-ssr/src/tests.rs
@@ -121,7 +121,7 @@ fn print_match_debug_info(match_finder: &MatchFinder<'_>, file_id: FileId, snipp
         snippet
     );
     for (index, d) in debug_info.iter().enumerate() {
-        println!("Node #{}\n{:#?}\n", index, d);
+        println!("Node #{index}\n{d:#?}\n");
     }
 }
 
@@ -144,7 +144,7 @@ fn assert_no_match(pattern: &str, code: &str) {
     let matches = match_finder.matches().flattened().matches;
     if !matches.is_empty() {
         print_match_debug_info(&match_finder, position.file_id, &matches[0].matched_text());
-        panic!("Got {} matches when we expected none: {:#?}", matches.len(), matches);
+        panic!("Got {} matches when we expected none: {matches:#?}", matches.len());
     }
 }
 
diff --git a/crates/ide/src/call_hierarchy.rs b/crates/ide/src/call_hierarchy.rs
index 5a8cda8fb3..48bcd37b62 100644
--- a/crates/ide/src/call_hierarchy.rs
+++ b/crates/ide/src/call_hierarchy.rs
@@ -57,7 +57,8 @@ pub(crate) fn incoming_calls(
         .flat_map(|func| func.usages(sema).all());
 
     for (_, references) in references {
-        let references = references.into_iter().map(|FileReference { name, .. }| name);
+        let references =
+            references.iter().filter_map(|FileReference { name, .. }| name.as_name_ref());
         for name in references {
             // This target is the containing function
             let nav = sema.ancestors_with_macros(name.syntax().clone()).find_map(|node| {
@@ -457,4 +458,28 @@ fn caller$0() {
             expect![[]],
         );
     }
+
+    #[test]
+    fn test_trait_method_call_hierarchy() {
+        check_hierarchy(
+            r#"
+trait T1 {
+    fn call$0ee();
+}
+
+struct S1;
+
+impl T1 for S1 {
+    fn callee() {}
+}
+
+fn caller() {
+    S1::callee();
+}
+"#,
+            expect![["callee Function FileId(0) 15..27 18..24"]],
+            expect![["caller Function FileId(0) 82..115 85..91 : [104..110]"]],
+            expect![[]],
+        );
+    }
 }
diff --git a/crates/ide/src/doc_links.rs b/crates/ide/src/doc_links.rs
index d96827326c..b4a7f2b918 100644
--- a/crates/ide/src/doc_links.rs
+++ b/crates/ide/src/doc_links.rs
@@ -273,7 +273,7 @@ impl DocCommentToken {
             let (in_expansion_range, link, ns) =
                 extract_definitions_from_docs(&docs).into_iter().find_map(|(range, link, ns)| {
                     let mapped = doc_mapping.map(range)?;
-                    (mapped.value.contains(abs_in_expansion_offset)).then(|| (mapped.value, link, ns))
+                    (mapped.value.contains(abs_in_expansion_offset)).then_some((mapped.value, link, ns))
                 })?;
             // get the relative range to the doc/attribute in the expansion
             let in_expansion_relative_range = in_expansion_range - descended_prefix_len - token_start;
@@ -285,7 +285,7 @@ impl DocCommentToken {
     }
 }
 
-fn broken_link_clone_cb<'a>(link: BrokenLink<'a>) -> Option<(CowStr<'a>, CowStr<'a>)> {
+fn broken_link_clone_cb(link: BrokenLink<'_>) -> Option<(CowStr<'_>, CowStr<'_>)> {
     Some((/*url*/ link.reference.clone(), /*title*/ link.reference))
 }
 
@@ -453,7 +453,7 @@ fn get_doc_base_url(db: &RootDatabase, def: Definition) -> Option<Url> {
             })?
         }
     };
-    Url::parse(&base).ok()?.join(&format!("{}/", display_name)).ok()
+    Url::parse(&base).ok()?.join(&format!("{display_name}/")).ok()
 }
 
 /// Get the filename and extension generated for a symbol by rustdoc.
@@ -488,7 +488,7 @@ fn filename_and_frag_for_def(
                 Some(kw) => {
                     format!("keyword.{}.html", kw.trim_matches('"'))
                 }
-                None => format!("{}/index.html", name),
+                None => format!("{name}/index.html"),
             },
             None => String::from("index.html"),
         },
diff --git a/crates/ide/src/doc_links/intra_doc_links.rs b/crates/ide/src/doc_links/intra_doc_links.rs
index 1df9aaae28..13088bdc3b 100644
--- a/crates/ide/src/doc_links/intra_doc_links.rs
+++ b/crates/ide/src/doc_links/intra_doc_links.rs
@@ -63,8 +63,8 @@ mod tests {
 
     fn check(link: &str, expected: Expect) {
         let (l, a) = parse_intra_doc_link(link);
-        let a = a.map_or_else(String::new, |a| format!(" ({:?})", a));
-        expected.assert_eq(&format!("{}{}", l, a));
+        let a = a.map_or_else(String::new, |a| format!(" ({a:?})"));
+        expected.assert_eq(&format!("{l}{a}"));
     }
 
     #[test]
diff --git a/crates/ide/src/doc_links/tests.rs b/crates/ide/src/doc_links/tests.rs
index c6bfb6b9d0..104181a33e 100644
--- a/crates/ide/src/doc_links/tests.rs
+++ b/crates/ide/src/doc_links/tests.rs
@@ -40,7 +40,7 @@ fn check_doc_links(ra_fixture: &str) {
         .into_iter()
         .map(|(_, link, ns)| {
             let def = resolve_doc_path_for_def(sema.db, cursor_def, &link, ns)
-                .unwrap_or_else(|| panic!("Failed to resolve {}", link));
+                .unwrap_or_else(|| panic!("Failed to resolve {link}"));
             let nav_target = def.try_to_nav(sema.db).unwrap();
             let range =
                 FileRange { file_id: nav_target.file_id, range: nav_target.focus_or_full_range() };
diff --git a/crates/ide/src/expand_macro.rs b/crates/ide/src/expand_macro.rs
index 93252339cd..418043d679 100644
--- a/crates/ide/src/expand_macro.rs
+++ b/crates/ide/src/expand_macro.rs
@@ -163,7 +163,7 @@ fn _format(
 ) -> Option<String> {
     use ide_db::base_db::{FileLoader, SourceDatabase};
     // hack until we get hygiene working (same character amount to preserve formatting as much as possible)
-    const DOLLAR_CRATE_REPLACE: &str = &"__r_a_";
+    const DOLLAR_CRATE_REPLACE: &str = "__r_a_";
     let expansion = expansion.replace("$crate", DOLLAR_CRATE_REPLACE);
     let (prefix, suffix) = match kind {
         SyntaxKind::MACRO_PAT => ("fn __(", ": u32);"),
diff --git a/crates/ide/src/extend_selection.rs b/crates/ide/src/extend_selection.rs
index 45f1fd7484..9f78c75e90 100644
--- a/crates/ide/src/extend_selection.rs
+++ b/crates/ide/src/extend_selection.rs
@@ -205,7 +205,7 @@ fn extend_single_word_in_comment_or_string(
     }
 
     let start_idx = before.rfind(non_word_char)? as u32;
-    let end_idx = after.find(non_word_char).unwrap_or_else(|| after.len()) as u32;
+    let end_idx = after.find(non_word_char).unwrap_or(after.len()) as u32;
 
     let from: TextSize = (start_idx + 1).into();
     let to: TextSize = (cursor_position + end_idx).into();
diff --git a/crates/ide/src/goto_declaration.rs b/crates/ide/src/goto_declaration.rs
index 926292c9b3..c7130a2a4b 100644
--- a/crates/ide/src/goto_declaration.rs
+++ b/crates/ide/src/goto_declaration.rs
@@ -1,18 +1,22 @@
-use hir::Semantics;
+use hir::{AsAssocItem, Semantics};
 use ide_db::{
     defs::{Definition, NameClass, NameRefClass},
     RootDatabase,
 };
 use syntax::{ast, match_ast, AstNode, SyntaxKind::*, T};
 
-use crate::{FilePosition, NavigationTarget, RangeInfo};
+use crate::{
+    goto_definition::goto_definition, navigation_target::TryToNav, FilePosition, NavigationTarget,
+    RangeInfo,
+};
 
 // Feature: Go to Declaration
 //
 // Navigates to the declaration of an identifier.
 //
-// This is currently the same as `Go to Definition` with the exception of outline modules where it
-// will navigate to the `mod name;` item declaration.
+// This is the same as `Go to Definition` with the following exceptions:
+// - outline modules will navigate to the `mod name;` item declaration
+// - trait assoc items will navigate to the assoc item of the trait declaration opposed to the trait impl
 pub(crate) fn goto_declaration(
     db: &RootDatabase,
     position: FilePosition,
@@ -32,25 +36,37 @@ pub(crate) fn goto_declaration(
                 match parent {
                     ast::NameRef(name_ref) => match NameRefClass::classify(&sema, &name_ref)? {
                         NameRefClass::Definition(it) => Some(it),
-                        _ => None
+                        NameRefClass::FieldShorthand { field_ref, .. } => return field_ref.try_to_nav(db),
                     },
                     ast::Name(name) => match NameClass::classify(&sema, &name)? {
-                        NameClass::Definition(it) => Some(it),
-                        _ => None
+                        NameClass::Definition(it) | NameClass::ConstReference(it) => Some(it),
+                        NameClass::PatFieldShorthand { field_ref, .. } => return field_ref.try_to_nav(db),
                     },
                     _ => None
                 }
             };
-            match def? {
+            let assoc = match def? {
                 Definition::Module(module) => {
-                    Some(NavigationTarget::from_module_to_decl(db, module))
+                    return Some(NavigationTarget::from_module_to_decl(db, module))
                 }
+                Definition::Const(c) => c.as_assoc_item(db),
+                Definition::TypeAlias(ta) => ta.as_assoc_item(db),
+                Definition::Function(f) => f.as_assoc_item(db),
                 _ => None,
-            }
+            }?;
+
+            let trait_ = assoc.containing_trait_impl(db)?;
+            let name = Some(assoc.name(db)?);
+            let item = trait_.items(db).into_iter().find(|it| it.name(db) == name)?;
+            item.try_to_nav(db)
         })
         .collect();
 
-    Some(RangeInfo::new(range, info))
+    if info.is_empty() {
+        goto_definition(db, position)
+    } else {
+        Some(RangeInfo::new(range, info))
+    }
 }
 
 #[cfg(test)]
@@ -109,4 +125,89 @@ mod foo {
 "#,
         )
     }
+
+    #[test]
+    fn goto_decl_goto_def_fallback() {
+        check(
+            r#"
+struct Foo;
+    // ^^^
+impl Foo$0 {}
+"#,
+        );
+    }
+
+    #[test]
+    fn goto_decl_assoc_item_no_impl_item() {
+        check(
+            r#"
+trait Trait {
+    const C: () = ();
+       // ^
+}
+impl Trait for () {}
+
+fn main() {
+    <()>::C$0;
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn goto_decl_assoc_item() {
+        check(
+            r#"
+trait Trait {
+    const C: () = ();
+       // ^
+}
+impl Trait for () {
+    const C: () = ();
+}
+
+fn main() {
+    <()>::C$0;
+}
+"#,
+        );
+        check(
+            r#"
+trait Trait {
+    const C: () = ();
+       // ^
+}
+impl Trait for () {
+    const C$0: () = ();
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn goto_decl_field_pat_shorthand() {
+        check(
+            r#"
+struct Foo { field: u32 }
+           //^^^^^
+fn main() {
+    let Foo { field$0 };
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn goto_decl_constructor_shorthand() {
+        check(
+            r#"
+struct Foo { field: u32 }
+           //^^^^^
+fn main() {
+    let field = 0;
+    Foo { field$0 };
+}
+"#,
+        );
+    }
 }
diff --git a/crates/ide/src/goto_definition.rs b/crates/ide/src/goto_definition.rs
index 43f7a529bc..73fd518a9e 100644
--- a/crates/ide/src/goto_definition.rs
+++ b/crates/ide/src/goto_definition.rs
@@ -187,7 +187,7 @@ mod tests {
         let (analysis, position) = fixture::position(ra_fixture);
         let navs = analysis.goto_definition(position).unwrap().expect("no definition found").info;
 
-        assert!(navs.is_empty(), "didn't expect this to resolve anywhere: {:?}", navs)
+        assert!(navs.is_empty(), "didn't expect this to resolve anywhere: {navs:?}")
     }
 
     #[test]
diff --git a/crates/ide/src/goto_implementation.rs b/crates/ide/src/goto_implementation.rs
index b3f711b6b8..190ab80ba0 100644
--- a/crates/ide/src/goto_implementation.rs
+++ b/crates/ide/src/goto_implementation.rs
@@ -110,7 +110,7 @@ fn impls_for_trait_item(
         .filter_map(|imp| {
             let item = imp.items(sema.db).iter().find_map(|itm| {
                 let itm_name = itm.name(sema.db)?;
-                (itm_name == fun_name).then(|| *itm)
+                (itm_name == fun_name).then_some(*itm)
             })?;
             item.try_to_nav(sema.db)
         })
diff --git a/crates/ide/src/highlight_related.rs b/crates/ide/src/highlight_related.rs
index 540a115832..55f8779eed 100644
--- a/crates/ide/src/highlight_related.rs
+++ b/crates/ide/src/highlight_related.rs
@@ -110,7 +110,7 @@ fn highlight_references(
         .and_then(|decl| decl.focus_range)
         .map(|range| {
             let category =
-                references::decl_mutability(&def, node, range).then(|| ReferenceCategory::Write);
+                references::decl_mutability(&def, node, range).then_some(ReferenceCategory::Write);
             HighlightedRange { range, category }
         });
         if let Some(hl_range) = hl_range {
@@ -365,7 +365,7 @@ mod tests {
 
         let mut expected = annotations
             .into_iter()
-            .map(|(r, access)| (r.range, (!access.is_empty()).then(|| access)))
+            .map(|(r, access)| (r.range, (!access.is_empty()).then_some(access)))
             .collect::<Vec<_>>();
 
         let mut actual = hls
@@ -765,6 +765,23 @@ fn foo() ->$0 u32 {
         );
     }
 
+    #[test]
+    fn test_hl_inner_tail_exit_points_loops() {
+        check(
+            r#"
+fn foo() ->$0 u32 {
+    'foo: while { return 0; true } {
+               // ^^^^^^
+        break 'foo 0;
+     // ^^^^^
+        return 0;
+     // ^^^^^^
+    }
+}
+"#,
+        );
+    }
+
     #[test]
     fn test_hl_break_loop() {
         check(
diff --git a/crates/ide/src/hover.rs b/crates/ide/src/hover.rs
index 838fb18c3d..b214fa12a4 100644
--- a/crates/ide/src/hover.rs
+++ b/crates/ide/src/hover.rs
@@ -127,6 +127,7 @@ pub(crate) fn hover(
             original_token.parent().and_then(ast::TokenTree::cast),
             Some(tt) if tt.syntax().ancestors().any(|it| ast::Meta::can_cast(it.kind()))
         );
+
     // prefer descending the same token kind in attribute expansions, in normal macros text
     // equivalency is more important
     let descended = if in_attr {
@@ -135,54 +136,67 @@ pub(crate) fn hover(
         sema.descend_into_macros_with_same_text(original_token.clone())
     };
 
-    // FIXME: Definition should include known lints and the like instead of having this special case here
-    let hovered_lint = descended.iter().find_map(|token| {
-        let attr = token.parent_ancestors().find_map(ast::Attr::cast)?;
-        render::try_for_lint(&attr, token)
-    });
-    if let Some(res) = hovered_lint {
-        return Some(RangeInfo::new(original_token.text_range(), res));
-    }
-
+    // try lint hover
     let result = descended
         .iter()
-        .filter_map(|token| {
-            let node = token.parent()?;
-            let class = IdentClass::classify_token(sema, token)?;
-            if let IdentClass::Operator(OperatorClass::Await(_)) = class {
-                // It's better for us to fall back to the keyword hover here,
-                // rendering poll is very confusing
-                return None;
-            }
-            Some(class.definitions().into_iter().zip(iter::once(node).cycle()))
+        .find_map(|token| {
+            // FIXME: Definition should include known lints and the like instead of having this special case here
+            let attr = token.parent_ancestors().find_map(ast::Attr::cast)?;
+            render::try_for_lint(&attr, token)
         })
-        .flatten()
-        .unique_by(|&(def, _)| def)
-        .filter_map(|(def, node)| hover_for_definition(sema, file_id, def, &node, config))
-        .reduce(|mut acc: HoverResult, HoverResult { markup, actions }| {
-            acc.actions.extend(actions);
-            acc.markup = Markup::from(format!("{}\n---\n{}", acc.markup, markup));
-            acc
+        // try item definitions
+        .or_else(|| {
+            descended
+                .iter()
+                .filter_map(|token| {
+                    let node = token.parent()?;
+                    let class = IdentClass::classify_token(sema, token)?;
+                    if let IdentClass::Operator(OperatorClass::Await(_)) = class {
+                        // It's better for us to fall back to the keyword hover here,
+                        // rendering poll is very confusing
+                        return None;
+                    }
+                    Some(class.definitions().into_iter().zip(iter::once(node).cycle()))
+                })
+                .flatten()
+                .unique_by(|&(def, _)| def)
+                .filter_map(|(def, node)| hover_for_definition(sema, file_id, def, &node, config))
+                .reduce(|mut acc: HoverResult, HoverResult { markup, actions }| {
+                    acc.actions.extend(actions);
+                    acc.markup = Markup::from(format!("{}\n---\n{markup}", acc.markup));
+                    acc
+                })
+        })
+        // try keywords
+        .or_else(|| descended.iter().find_map(|token| render::keyword(sema, config, token)))
+        // try rest item hover
+        .or_else(|| {
+            descended.iter().find_map(|token| {
+                if token.kind() != DOT2 {
+                    return None;
+                }
+
+                let rest_pat = token.parent().and_then(ast::RestPat::cast)?;
+                let record_pat_field_list =
+                    rest_pat.syntax().parent().and_then(ast::RecordPatFieldList::cast)?;
+
+                let record_pat =
+                    record_pat_field_list.syntax().parent().and_then(ast::RecordPat::cast)?;
+
+                Some(render::struct_rest_pat(sema, config, &record_pat))
+            })
         });
 
-    if result.is_none() {
-        // fallbacks, show keywords or types
-
-        let res = descended.iter().find_map(|token| render::keyword(sema, config, token));
-        if let Some(res) = res {
-            return Some(RangeInfo::new(original_token.text_range(), res));
-        }
-        let res = descended
-            .iter()
-            .find_map(|token| hover_type_fallback(sema, config, token, &original_token));
-        if let Some(_) = res {
-            return res;
-        }
-    }
-    result.map(|mut res: HoverResult| {
-        res.actions = dedupe_or_merge_hover_actions(res.actions);
-        RangeInfo::new(original_token.text_range(), res)
-    })
+    result
+        .map(|mut res: HoverResult| {
+            res.actions = dedupe_or_merge_hover_actions(res.actions);
+            RangeInfo::new(original_token.text_range(), res)
+        })
+        // fallback to type hover if there aren't any other suggestions
+        // this finds its own range instead of using the closest token's range
+        .or_else(|| {
+            descended.iter().find_map(|token| hover_type_fallback(sema, config, token, token))
+        })
 }
 
 pub(crate) fn hover_for_definition(
@@ -269,6 +283,7 @@ fn hover_type_fallback(
     };
 
     let res = render::type_info(sema, config, &expr_or_pat)?;
+
     let range = sema
         .original_range_opt(&node)
         .map(|frange| frange.range)
diff --git a/crates/ide/src/hover/render.rs b/crates/ide/src/hover/render.rs
index d109c07691..47257f0bfa 100644
--- a/crates/ide/src/hover/render.rs
+++ b/crates/ide/src/hover/render.rs
@@ -2,7 +2,9 @@
 use std::fmt::Display;
 
 use either::Either;
-use hir::{AsAssocItem, AttributeTemplate, HasAttrs, HasSource, HirDisplay, Semantics, TypeInfo};
+use hir::{
+    Adt, AsAssocItem, AttributeTemplate, HasAttrs, HasSource, HirDisplay, Semantics, TypeInfo,
+};
 use ide_db::{
     base_db::SourceDatabase,
     defs::Definition,
@@ -14,7 +16,9 @@ use ide_db::{
 use itertools::Itertools;
 use stdx::format_to;
 use syntax::{
-    algo, ast, match_ast, AstNode, Direction,
+    algo,
+    ast::{self, RecordPat},
+    match_ast, AstNode, Direction,
     SyntaxKind::{LET_EXPR, LET_STMT},
     SyntaxToken, T,
 };
@@ -250,6 +254,50 @@ pub(super) fn keyword(
     Some(HoverResult { markup, actions })
 }
 
+/// Returns missing types in a record pattern.
+/// Only makes sense when there's a rest pattern in the record pattern.
+/// i.e. `let S {a, ..} = S {a: 1, b: 2}`
+pub(super) fn struct_rest_pat(
+    sema: &Semantics<'_, RootDatabase>,
+    config: &HoverConfig,
+    pattern: &RecordPat,
+) -> HoverResult {
+    let missing_fields = sema.record_pattern_missing_fields(pattern);
+
+    // if there are no missing fields, the end result is a hover that shows ".."
+    // should be left in to indicate that there are no more fields in the pattern
+    // example, S {a: 1, b: 2, ..} when struct S {a: u32, b: u32}
+
+    let mut res = HoverResult::default();
+    let mut targets: Vec<hir::ModuleDef> = Vec::new();
+    let mut push_new_def = |item: hir::ModuleDef| {
+        if !targets.contains(&item) {
+            targets.push(item);
+        }
+    };
+    for (_, t) in &missing_fields {
+        walk_and_push_ty(sema.db, t, &mut push_new_def);
+    }
+
+    res.markup = {
+        let mut s = String::from(".., ");
+        for (f, _) in &missing_fields {
+            s += f.display(sema.db).to_string().as_ref();
+            s += ", ";
+        }
+        // get rid of trailing comma
+        s.truncate(s.len() - 2);
+
+        if config.markdown() {
+            Markup::fenced_block(&s)
+        } else {
+            s.into()
+        }
+    };
+    res.actions.push(HoverAction::goto_type_from_targets(sema.db, targets));
+    res
+}
+
 pub(super) fn try_for_lint(attr: &ast::Attr, token: &SyntaxToken) -> Option<HoverResult> {
     let (path, tt) = attr.as_simple_call()?;
     if !tt.syntax().text_range().contains(token.text_range().start()) {
@@ -342,15 +390,35 @@ pub(super) fn definition(
     let mod_path = definition_mod_path(db, &def);
     let (label, docs) = match def {
         Definition::Macro(it) => label_and_docs(db, it),
-        Definition::Field(it) => label_and_docs(db, it),
+        Definition::Field(it) => label_and_layout_info_and_docs(db, it, |&it| {
+            let var_def = it.parent_def(db);
+            let id = it.index();
+            let layout = it.layout(db).ok()?;
+            let offset = match var_def {
+                hir::VariantDef::Struct(s) => Adt::from(s)
+                    .layout(db)
+                    .ok()
+                    .map(|layout| format!(", offset = {}", layout.fields.offset(id).bytes())),
+                _ => None,
+            };
+            Some(format!(
+                "size = {}, align = {}{}",
+                layout.size.bytes(),
+                layout.align.abi.bytes(),
+                offset.as_deref().unwrap_or_default()
+            ))
+        }),
         Definition::Module(it) => label_and_docs(db, it),
         Definition::Function(it) => label_and_docs(db, it),
-        Definition::Adt(it) => label_and_docs(db, it),
+        Definition::Adt(it) => label_and_layout_info_and_docs(db, it, |&it| {
+            let layout = it.layout(db).ok()?;
+            Some(format!("size = {}, align = {}", layout.size.bytes(), layout.align.abi.bytes()))
+        }),
         Definition::Variant(it) => label_value_and_docs(db, it, |&it| {
             if !it.parent_enum(db).is_data_carrying(db) {
                 match it.eval(db) {
-                    Ok(x) => Some(format!("{}", x)),
-                    Err(_) => it.value(db).map(|x| format!("{:?}", x)),
+                    Ok(x) => Some(format!("{x}")),
+                    Err(_) => it.value(db).map(|x| format!("{x:?}")),
                 }
             } else {
                 None
@@ -359,7 +427,7 @@ pub(super) fn definition(
         Definition::Const(it) => label_value_and_docs(db, it, |it| {
             let body = it.eval(db);
             match body {
-                Ok(x) => Some(format!("{}", x)),
+                Ok(x) => Some(format!("{x}")),
                 Err(_) => {
                     let source = it.source(db)?;
                     let mut body = source.value.body()?.syntax().clone();
@@ -415,7 +483,7 @@ pub(super) fn definition(
 
 fn render_builtin_attr(db: &RootDatabase, attr: hir::BuiltinAttr) -> Option<Markup> {
     let name = attr.name(db);
-    let desc = format!("#[{}]", name);
+    let desc = format!("#[{name}]");
 
     let AttributeTemplate { word, list, name_value_str } = match attr.template(db) {
         Some(template) => template,
@@ -443,6 +511,25 @@ where
     (label, docs)
 }
 
+fn label_and_layout_info_and_docs<D, E, V>(
+    db: &RootDatabase,
+    def: D,
+    value_extractor: E,
+) -> (String, Option<hir::Documentation>)
+where
+    D: HasAttrs + HirDisplay,
+    E: Fn(&D) -> Option<V>,
+    V: Display,
+{
+    let label = if let Some(value) = value_extractor(&def) {
+        format!("{} // {value}", def.display(db))
+    } else {
+        def.display(db).to_string()
+    };
+    let docs = def.attrs(db).docs();
+    (label, docs)
+}
+
 fn label_value_and_docs<D, E, V>(
     db: &RootDatabase,
     def: D,
@@ -454,7 +541,7 @@ where
     V: Display,
 {
     let label = if let Some(value) = value_extractor(&def) {
-        format!("{} = {}", def.display(db), value)
+        format!("{} = {value}", def.display(db))
     } else {
         def.display(db).to_string()
     };
@@ -518,9 +605,9 @@ fn local(db: &RootDatabase, it: hir::Local) -> Option<Markup> {
             } else {
                 ""
             };
-            format!("{}{}{}: {}", let_kw, is_mut, name, ty)
+            format!("{let_kw}{is_mut}{name}: {ty}")
         }
-        Either::Right(_) => format!("{}self: {}", is_mut, ty),
+        Either::Right(_) => format!("{is_mut}self: {ty}"),
     };
     markup(None, desc, None)
 }
diff --git a/crates/ide/src/hover/tests.rs b/crates/ide/src/hover/tests.rs
index eb997e6fef..c7f241f2fe 100644
--- a/crates/ide/src/hover/tests.rs
+++ b/crates/ide/src/hover/tests.rs
@@ -37,7 +37,7 @@ fn check(ra_fixture: &str, expect: Expect) {
     let content = analysis.db.file_text(position.file_id);
     let hovered_element = &content[hover.range];
 
-    let actual = format!("*{}*\n{}\n", hovered_element, hover.info.markup);
+    let actual = format!("*{hovered_element}*\n{}\n", hover.info.markup);
     expect.assert_eq(&actual)
 }
 
@@ -58,7 +58,7 @@ fn check_hover_no_links(ra_fixture: &str, expect: Expect) {
     let content = analysis.db.file_text(position.file_id);
     let hovered_element = &content[hover.range];
 
-    let actual = format!("*{}*\n{}\n", hovered_element, hover.info.markup);
+    let actual = format!("*{hovered_element}*\n{}\n", hover.info.markup);
     expect.assert_eq(&actual)
 }
 
@@ -79,7 +79,7 @@ fn check_hover_no_markdown(ra_fixture: &str, expect: Expect) {
     let content = analysis.db.file_text(position.file_id);
     let hovered_element = &content[hover.range];
 
-    let actual = format!("*{}*\n{}\n", hovered_element, hover.info.markup);
+    let actual = format!("*{hovered_element}*\n{}\n", hover.info.markup);
     expect.assert_eq(&actual)
 }
 
@@ -522,6 +522,27 @@ fn main() { }
     );
 }
 
+#[test]
+fn hover_field_offset() {
+    // Hovering over the field when instantiating
+    check(
+        r#"
+struct Foo { fiel$0d_a: u8, field_b: i32, field_c: i16 }
+"#,
+        expect![[r#"
+            *field_a*
+
+            ```rust
+            test::Foo
+            ```
+
+            ```rust
+            field_a: u8 // size = 1, align = 1, offset = 4
+            ```
+        "#]],
+    );
+}
+
 #[test]
 fn hover_shows_struct_field_info() {
     // Hovering over the field when instantiating
@@ -534,16 +555,16 @@ fn main() {
 }
 "#,
         expect![[r#"
-                *field_a*
+            *field_a*
 
-                ```rust
-                test::Foo
-                ```
+            ```rust
+            test::Foo
+            ```
 
-                ```rust
-                field_a: u32
-                ```
-            "#]],
+            ```rust
+            field_a: u32 // size = 4, align = 4, offset = 0
+            ```
+        "#]],
     );
 
     // Hovering over the field in the definition
@@ -556,16 +577,16 @@ fn main() {
 }
 "#,
         expect![[r#"
-                *field_a*
+            *field_a*
 
-                ```rust
-                test::Foo
-                ```
+            ```rust
+            test::Foo
+            ```
 
-                ```rust
-                field_a: u32
-                ```
-            "#]],
+            ```rust
+            field_a: u32 // size = 4, align = 4, offset = 0
+            ```
+        "#]],
     );
 }
 
@@ -1508,30 +1529,30 @@ struct Bar;
 
 fn foo() { let bar = Ba$0r; }
 "#,
-        expect![[r##"
-                *Bar*
+        expect![[r#"
+            *Bar*
 
-                ```rust
-                test
-                ```
+            ```rust
+            test
+            ```
 
-                ```rust
-                struct Bar
-                ```
+            ```rust
+            struct Bar // size = 0, align = 1
+            ```
 
-                ---
+            ---
 
-                This is an example
-                multiline doc
+            This is an example
+            multiline doc
 
-                # Example
+            # Example
 
-                ```
-                let five = 5;
+            ```
+            let five = 5;
 
-                assert_eq!(6, my_crate::add_one(5));
-                ```
-            "##]],
+            assert_eq!(6, my_crate::add_one(5));
+            ```
+        "#]],
     );
 }
 
@@ -1545,20 +1566,20 @@ struct Bar;
 fn foo() { let bar = Ba$0r; }
 "#,
         expect![[r#"
-                *Bar*
+            *Bar*
 
-                ```rust
-                test
-                ```
+            ```rust
+            test
+            ```
 
-                ```rust
-                struct Bar
-                ```
+            ```rust
+            struct Bar // size = 0, align = 1
+            ```
 
-                ---
+            ---
 
-                bar docs
-            "#]],
+            bar docs
+        "#]],
     );
 }
 
@@ -1574,22 +1595,22 @@ struct Bar;
 fn foo() { let bar = Ba$0r; }
 "#,
         expect![[r#"
-                *Bar*
+            *Bar*
 
-                ```rust
-                test
-                ```
+            ```rust
+            test
+            ```
 
-                ```rust
-                struct Bar
-                ```
+            ```rust
+            struct Bar // size = 0, align = 1
+            ```
 
-                ---
+            ---
 
-                bar docs 0
-                bar docs 1
-                bar docs 2
-            "#]],
+            bar docs 0
+            bar docs 1
+            bar docs 2
+        "#]],
     );
 }
 
@@ -1602,20 +1623,20 @@ pub struct Foo;
 pub struct B$0ar
 "#,
         expect![[r#"
-                *Bar*
+            *Bar*
 
-                ```rust
-                test
-                ```
+            ```rust
+            test
+            ```
 
-                ```rust
-                pub struct Bar
-                ```
+            ```rust
+            pub struct Bar // size = 0, align = 1
+            ```
 
-                ---
+            ---
 
-                [external](https://www.google.com)
-            "#]],
+            [external](https://www.google.com)
+        "#]],
     );
 }
 
@@ -1629,20 +1650,20 @@ pub struct Foo;
 pub struct B$0ar
 "#,
         expect![[r#"
-                *Bar*
+            *Bar*
 
-                ```rust
-                test
-                ```
+            ```rust
+            test
+            ```
 
-                ```rust
-                pub struct Bar
-                ```
+            ```rust
+            pub struct Bar // size = 0, align = 1
+            ```
 
-                ---
+            ---
 
-                [baz](Baz)
-            "#]],
+            [baz](Baz)
+        "#]],
     );
 }
 
@@ -2960,7 +2981,7 @@ fn main() {
             ```
 
             ```rust
-            f: i32
+            f: i32 // size = 4, align = 4, offset = 0
             ```
         "#]],
     );
@@ -3636,6 +3657,163 @@ enum E {
 
 #[test]
 fn hover_const_eval() {
+    check(
+        r#"
+trait T {
+    const B: bool = false;
+}
+impl T for <()> {
+    /// true
+    const B: bool = true;
+}
+fn main() {
+    <()>::B$0;
+}
+"#,
+        expect![[r#"
+        *B*
+
+        ```rust
+        test
+        ```
+
+        ```rust
+        const B: bool = true
+        ```
+
+        ---
+
+        true
+    "#]],
+    );
+
+    check(
+        r#"
+struct A {
+    i: i32
+};
+
+trait T {
+    const AA: A = A {
+        i: 1
+    };
+}
+impl T for i32 {
+    const AA: A = A {
+        i: 2
+    }
+}
+fn main() {
+    <i32>::AA$0;
+}
+"#,
+        expect![[r#"
+        *AA*
+
+        ```rust
+        test
+        ```
+
+        ```rust
+        const AA: A = A {
+                i: 2
+            }
+        ```
+    "#]],
+    );
+
+    check(
+        r#"
+trait T {
+    /// false
+    const B: bool = false;
+}
+impl T for () {
+    /// true
+    const B: bool = true;
+}
+fn main() {
+    T::B$0;
+}
+"#,
+        expect![[r#"
+            *B*
+
+            ```rust
+            test
+            ```
+
+            ```rust
+            const B: bool = false
+            ```
+
+            ---
+
+            false
+        "#]],
+    );
+
+    check(
+        r#"
+trait T {
+    /// false
+    const B: bool = false;
+}
+impl T for () {
+}
+fn main() {
+    <()>::B$0;
+}
+"#,
+        expect![[r#"
+            *B*
+
+            ```rust
+            test
+            ```
+
+            ```rust
+            const B: bool = false
+            ```
+
+            ---
+
+            false
+        "#]],
+    );
+
+    check(
+        r#"
+trait T {
+    /// false
+    const B: bool = false;
+}
+impl T for () {
+    /// true
+    const B: bool = true;
+}
+impl T for i32 {}
+fn main() {
+    <i32>::B$0;
+}
+"#,
+        expect![[r#"
+            *B*
+
+            ```rust
+            test
+            ```
+
+            ```rust
+            const B: bool = false
+            ```
+
+            ---
+
+            false
+        "#]],
+    );
+
     // show hex for <10
     check(
         r#"
@@ -3901,6 +4079,37 @@ const FOO$0: f64 = 1.0f64;
     );
 }
 
+#[test]
+fn hover_const_eval_in_generic_trait() {
+    // Doesn't compile, but we shouldn't crash.
+    check(
+        r#"
+trait Trait<T> {
+    const FOO: bool = false;
+}
+struct S<T>(T);
+impl<T> Trait<T> for S<T> {
+    const FOO: bool = true;
+}
+
+fn test() {
+    S::FOO$0;
+}
+"#,
+        expect![[r#"
+            *FOO*
+
+            ```rust
+            test
+            ```
+
+            ```rust
+            const FOO: bool = true
+            ```
+        "#]],
+    );
+}
+
 #[test]
 fn hover_const_pat() {
     check(
@@ -4203,20 +4412,20 @@ pub fn gimme() -> theitem::TheItem {
 }
 "#,
         expect![[r#"
-                *[`TheItem`]*
+            *[`TheItem`]*
 
-                ```rust
-                test::theitem
-                ```
+            ```rust
+            test::theitem
+            ```
 
-                ```rust
-                pub struct TheItem
-                ```
+            ```rust
+            pub struct TheItem // size = 0, align = 1
+            ```
 
-                ---
+            ---
 
-                This is the item. Cool!
-            "#]],
+            This is the item. Cool!
+        "#]],
     );
 }
 
@@ -4351,20 +4560,20 @@ mod string {
 }
 "#,
         expect![[r#"
-                *String*
+            *String*
 
-                ```rust
-                main
-                ```
+            ```rust
+            main
+            ```
 
-                ```rust
-                struct String
-                ```
+            ```rust
+            struct String // size = 0, align = 1
+            ```
 
-                ---
+            ---
 
-                Custom `String` type.
-            "#]],
+            Custom `String` type.
+        "#]],
     )
 }
 
@@ -5025,7 +5234,7 @@ foo_macro!(
             ```
 
             ```rust
-            pub struct Foo
+            pub struct Foo // size = 0, align = 1
             ```
 
             ---
@@ -5040,7 +5249,7 @@ fn hover_intra_in_attr() {
     check(
         r#"
 #[doc = "Doc comment for [`Foo$0`]"]
-pub struct Foo;
+pub struct Foo(i32);
 "#,
         expect![[r#"
             *[`Foo`]*
@@ -5050,7 +5259,7 @@ pub struct Foo;
             ```
 
             ```rust
-            pub struct Foo
+            pub struct Foo // size = 4, align = 4
             ```
 
             ---
@@ -5155,6 +5364,28 @@ enum Enum {
     );
 }
 
+#[test]
+fn hover_record_variant_field() {
+    check(
+        r#"
+enum Enum {
+    RecordV { field$0: u32 }
+}
+"#,
+        expect![[r#"
+            *field*
+
+            ```rust
+            test::RecordV
+            ```
+
+            ```rust
+            field: u32 // size = 4, align = 4
+            ```
+        "#]],
+    );
+}
+
 #[test]
 fn hover_trait_impl_assoc_item_def_doc_forwarding() {
     check(
@@ -5307,3 +5538,38 @@ fn main() { $0V; }
         "#]],
     );
 }
+
+#[test]
+fn hover_rest_pat() {
+    check(
+        r#"
+struct Struct {a: u32, b: u32, c: u8, d: u16};
+
+fn main() {
+    let Struct {a, c, .$0.} = Struct {a: 1, b: 2, c: 3, d: 4};
+}
+"#,
+        expect![[r#"
+            *..*
+            ```rust
+            .., b: u32, d: u16
+            ```
+        "#]],
+    );
+
+    check(
+        r#"
+struct Struct {a: u32, b: u32, c: u8, d: u16};
+
+fn main() {
+    let Struct {a, b, c, d, .$0.} = Struct {a: 1, b: 2, c: 3, d: 4};
+}
+"#,
+        expect![[r#"
+            *..*
+            ```rust
+            ..
+            ```
+        "#]],
+    );
+}
diff --git a/crates/ide/src/inlay_hints.rs b/crates/ide/src/inlay_hints.rs
index 37384c4e7e..48a7bbfecf 100644
--- a/crates/ide/src/inlay_hints.rs
+++ b/crates/ide/src/inlay_hints.rs
@@ -1,31 +1,42 @@
-use std::fmt;
+use std::{
+    fmt::{self, Write},
+    mem::take,
+};
 
 use either::Either;
-use hir::{
-    known, Adjust, AutoBorrow, Callable, HasVisibility, HirDisplay, Mutability, OverloadedDeref,
-    PointerCast, Safety, Semantics, TypeInfo,
-};
-use ide_db::{
-    base_db::FileRange, famous_defs::FamousDefs, syntax_helpers::node_ext::walk_ty, FxHashMap,
-    RootDatabase,
-};
+use hir::{known, HasVisibility, HirDisplay, HirWrite, ModuleDef, ModuleDefId, Semantics};
+use ide_db::{base_db::FileRange, famous_defs::FamousDefs, RootDatabase};
 use itertools::Itertools;
-use stdx::to_lower_snake_case;
+use stdx::never;
 use syntax::{
-    ast::{self, AstNode, HasArgList, HasGenericParams, HasName, UnaryOp},
-    match_ast, Direction, NodeOrToken, SmolStr, SyntaxKind, SyntaxNode, SyntaxToken, TextRange,
-    TextSize, T,
+    ast::{self, AstNode},
+    match_ast, NodeOrToken, SyntaxNode, TextRange, TextSize,
 };
 
-use crate::FileId;
+use crate::{navigation_target::TryToNav, FileId};
+
+mod closing_brace;
+mod implicit_static;
+mod fn_lifetime_fn;
+mod closure_ret;
+mod adjustment;
+mod chaining;
+mod param_name;
+mod binding_mode;
+mod bind_pat;
+mod discriminant;
 
 #[derive(Clone, Debug, PartialEq, Eq)]
 pub struct InlayHintsConfig {
+    pub location_links: bool,
     pub render_colons: bool,
     pub type_hints: bool,
+    pub discriminant_hints: DiscriminantHints,
     pub parameter_hints: bool,
     pub chaining_hints: bool,
     pub adjustment_hints: AdjustmentHints,
+    pub adjustment_hints_mode: AdjustmentHintsMode,
+    pub adjustment_hints_hide_outside_unsafe: bool,
     pub closure_return_type_hints: ClosureReturnTypeHints,
     pub binding_mode_hints: bool,
     pub lifetime_elision_hints: LifetimeElisionHints,
@@ -43,6 +54,13 @@ pub enum ClosureReturnTypeHints {
     Never,
 }
 
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub enum DiscriminantHints {
+    Always,
+    Never,
+    Fieldless,
+}
+
 #[derive(Clone, Debug, PartialEq, Eq)]
 pub enum LifetimeElisionHints {
     Always,
@@ -57,6 +75,14 @@ pub enum AdjustmentHints {
     Never,
 }
 
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+pub enum AdjustmentHintsMode {
+    Prefix,
+    Postfix,
+    PreferPrefix,
+    PreferPostfix,
+}
+
 #[derive(Clone, Debug, PartialEq, Eq)]
 pub enum InlayKind {
     BindingModeHint,
@@ -65,10 +91,13 @@ pub enum InlayKind {
     ClosureReturnTypeHint,
     GenericParamListHint,
     AdjustmentHint,
-    AdjustmentHintClosingParenthesis,
+    AdjustmentHintPostfix,
     LifetimeHint,
     ParameterHint,
     TypeHint,
+    DiscriminantHint,
+    OpeningParenthesis,
+    ClosingParenthesis,
 }
 
 #[derive(Debug)]
@@ -86,6 +115,7 @@ pub enum InlayTooltip {
     HoverOffset(FileId, TextSize),
 }
 
+#[derive(Default)]
 pub struct InlayHintLabel {
     pub parts: Vec<InlayHintLabelPart>,
 }
@@ -169,6 +199,101 @@ impl fmt::Debug for InlayHintLabelPart {
     }
 }
 
+#[derive(Debug)]
+struct InlayHintLabelBuilder<'a> {
+    db: &'a RootDatabase,
+    result: InlayHintLabel,
+    last_part: String,
+    location_link_enabled: bool,
+    location: Option<FileRange>,
+}
+
+impl fmt::Write for InlayHintLabelBuilder<'_> {
+    fn write_str(&mut self, s: &str) -> fmt::Result {
+        self.last_part.write_str(s)
+    }
+}
+
+impl HirWrite for InlayHintLabelBuilder<'_> {
+    fn start_location_link(&mut self, def: ModuleDefId) {
+        if !self.location_link_enabled {
+            return;
+        }
+        if self.location.is_some() {
+            never!("location link is already started");
+        }
+        self.make_new_part();
+        let Some(location) = ModuleDef::from(def).try_to_nav(self.db) else { return };
+        let location =
+            FileRange { file_id: location.file_id, range: location.focus_or_full_range() };
+        self.location = Some(location);
+    }
+
+    fn end_location_link(&mut self) {
+        if !self.location_link_enabled {
+            return;
+        }
+        self.make_new_part();
+    }
+}
+
+impl InlayHintLabelBuilder<'_> {
+    fn make_new_part(&mut self) {
+        self.result.parts.push(InlayHintLabelPart {
+            text: take(&mut self.last_part),
+            linked_location: self.location.take(),
+        });
+    }
+
+    fn finish(mut self) -> InlayHintLabel {
+        self.make_new_part();
+        self.result
+    }
+}
+
+fn label_of_ty(
+    famous_defs @ FamousDefs(sema, _): &FamousDefs<'_, '_>,
+    config: &InlayHintsConfig,
+    ty: hir::Type,
+) -> Option<InlayHintLabel> {
+    fn rec(
+        sema: &Semantics<'_, RootDatabase>,
+        famous_defs: &FamousDefs<'_, '_>,
+        mut max_length: Option<usize>,
+        ty: hir::Type,
+        label_builder: &mut InlayHintLabelBuilder<'_>,
+    ) {
+        let iter_item_type = hint_iterator(sema, famous_defs, &ty);
+        match iter_item_type {
+            Some(ty) => {
+                const LABEL_START: &str = "impl Iterator<Item = ";
+                const LABEL_END: &str = ">";
+
+                max_length =
+                    max_length.map(|len| len.saturating_sub(LABEL_START.len() + LABEL_END.len()));
+
+                label_builder.write_str(LABEL_START).unwrap();
+                rec(sema, famous_defs, max_length, ty, label_builder);
+                label_builder.write_str(LABEL_END).unwrap();
+            }
+            None => {
+                let _ = ty.display_truncated(sema.db, max_length).write_to(label_builder);
+            }
+        };
+    }
+
+    let mut label_builder = InlayHintLabelBuilder {
+        db: sema.db,
+        last_part: String::new(),
+        location: None,
+        location_link_enabled: config.location_links,
+        result: InlayHintLabel::default(),
+    };
+    rec(sema, famous_defs, config.max_length, ty, &mut label_builder);
+    let r = label_builder.finish();
+    Some(r)
+}
+
 // Feature: Inlay Hints
 //
 // rust-analyzer shows additional information inline with the source code.
@@ -200,7 +325,7 @@ pub(crate) fn inlay_hints(
 
     let mut acc = Vec::new();
 
-    if let Some(scope) = sema.scope(&file) {
+    if let Some(scope) = sema.scope(file) {
         let famous_defs = FamousDefs(&sema, scope.krate());
 
         let hints = |node| hints(&mut acc, &famous_defs, config, file_id, node);
@@ -226,18 +351,18 @@ fn hints(
     file_id: FileId,
     node: SyntaxNode,
 ) {
-    closing_brace_hints(hints, sema, config, file_id, node.clone());
+    closing_brace::hints(hints, sema, config, file_id, node.clone());
     match_ast! {
         match node {
             ast::Expr(expr) => {
-                chaining_hints(hints, sema, &famous_defs, config, file_id, &expr);
-                adjustment_hints(hints, sema, config, &expr);
+                chaining::hints(hints, famous_defs, config, file_id, &expr);
+                adjustment::hints(hints, sema, config, &expr);
                 match expr {
-                    ast::Expr::CallExpr(it) => param_name_hints(hints, sema, config, ast::Expr::from(it)),
+                    ast::Expr::CallExpr(it) => param_name::hints(hints, sema, config, ast::Expr::from(it)),
                     ast::Expr::MethodCallExpr(it) => {
-                        param_name_hints(hints, sema, config, ast::Expr::from(it))
+                        param_name::hints(hints, sema, config, ast::Expr::from(it))
                     }
-                    ast::Expr::ClosureExpr(it) => closure_ret_hints(hints, sema, &famous_defs, config, file_id, it),
+                    ast::Expr::ClosureExpr(it) => closure_ret::hints(hints, famous_defs, config, file_id, it),
                     // We could show reborrows for all expressions, but usually that is just noise to the user
                     // and the main point here is to show why "moving" a mutable reference doesn't necessarily move it
                     // ast::Expr::PathExpr(_) => reborrow_hints(hints, sema, config, &expr),
@@ -245,21 +370,24 @@ fn hints(
                 }
             },
             ast::Pat(it) => {
-                binding_mode_hints(hints, sema, config, &it);
+                binding_mode::hints(hints, sema, config, &it);
                 if let ast::Pat::IdentPat(it) = it {
-                    bind_pat_hints(hints, sema, config, file_id, &it);
+                    bind_pat::hints(hints, famous_defs, config, file_id, &it);
                 }
                 Some(())
             },
             ast::Item(it) => match it {
                 // FIXME: record impl lifetimes so they aren't being reused in assoc item lifetime inlay hints
                 ast::Item::Impl(_) => None,
-                ast::Item::Fn(it) => fn_lifetime_fn_hints(hints, config, it),
+                ast::Item::Fn(it) => fn_lifetime_fn::hints(hints, config, it),
                 // static type elisions
-                ast::Item::Static(it) => implicit_static_hints(hints, config, Either::Left(it)),
-                ast::Item::Const(it) => implicit_static_hints(hints, config, Either::Right(it)),
+                ast::Item::Static(it) => implicit_static::hints(hints, config, Either::Left(it)),
+                ast::Item::Const(it) => implicit_static::hints(hints, config, Either::Right(it)),
                 _ => None,
             },
+            ast::Variant(v) => {
+                discriminant::hints(hints, famous_defs, config, file_id, &v)
+            },
             // FIXME: fn-ptr type, dyn fn type, and trait object type elisions
             ast::Type(_) => None,
             _ => None,
@@ -267,733 +395,12 @@ fn hints(
     };
 }
 
-fn closing_brace_hints(
-    acc: &mut Vec<InlayHint>,
-    sema: &Semantics<'_, RootDatabase>,
-    config: &InlayHintsConfig,
-    file_id: FileId,
-    node: SyntaxNode,
-) -> Option<()> {
-    let min_lines = config.closing_brace_hints_min_lines?;
-
-    let name = |it: ast::Name| it.syntax().text_range();
-
-    let mut closing_token;
-    let (label, name_range) = if let Some(item_list) = ast::AssocItemList::cast(node.clone()) {
-        closing_token = item_list.r_curly_token()?;
-
-        let parent = item_list.syntax().parent()?;
-        match_ast! {
-            match parent {
-                ast::Impl(imp) => {
-                    let imp = sema.to_def(&imp)?;
-                    let ty = imp.self_ty(sema.db);
-                    let trait_ = imp.trait_(sema.db);
-                    let hint_text = match trait_ {
-                        Some(tr) => format!("impl {} for {}", tr.name(sema.db), ty.display_truncated(sema.db, config.max_length)),
-                        None => format!("impl {}", ty.display_truncated(sema.db, config.max_length)),
-                    };
-                    (hint_text, None)
-                },
-                ast::Trait(tr) => {
-                    (format!("trait {}", tr.name()?), tr.name().map(name))
-                },
-                _ => return None,
-            }
-        }
-    } else if let Some(list) = ast::ItemList::cast(node.clone()) {
-        closing_token = list.r_curly_token()?;
-
-        let module = ast::Module::cast(list.syntax().parent()?)?;
-        (format!("mod {}", module.name()?), module.name().map(name))
-    } else if let Some(block) = ast::BlockExpr::cast(node.clone()) {
-        closing_token = block.stmt_list()?.r_curly_token()?;
-
-        let parent = block.syntax().parent()?;
-        match_ast! {
-            match parent {
-                ast::Fn(it) => {
-                    // FIXME: this could include parameters, but `HirDisplay` prints too much info
-                    // and doesn't respect the max length either, so the hints end up way too long
-                    (format!("fn {}", it.name()?), it.name().map(name))
-                },
-                ast::Static(it) => (format!("static {}", it.name()?), it.name().map(name)),
-                ast::Const(it) => {
-                    if it.underscore_token().is_some() {
-                        ("const _".into(), None)
-                    } else {
-                        (format!("const {}", it.name()?), it.name().map(name))
-                    }
-                },
-                _ => return None,
-            }
-        }
-    } else if let Some(mac) = ast::MacroCall::cast(node.clone()) {
-        let last_token = mac.syntax().last_token()?;
-        if last_token.kind() != T![;] && last_token.kind() != SyntaxKind::R_CURLY {
-            return None;
-        }
-        closing_token = last_token;
-
-        (
-            format!("{}!", mac.path()?),
-            mac.path().and_then(|it| it.segment()).map(|it| it.syntax().text_range()),
-        )
-    } else {
-        return None;
-    };
-
-    if let Some(mut next) = closing_token.next_token() {
-        if next.kind() == T![;] {
-            if let Some(tok) = next.next_token() {
-                closing_token = next;
-                next = tok;
-            }
-        }
-        if !(next.kind() == SyntaxKind::WHITESPACE && next.text().contains('\n')) {
-            // Only display the hint if the `}` is the last token on the line
-            return None;
-        }
-    }
-
-    let mut lines = 1;
-    node.text().for_each_chunk(|s| lines += s.matches('\n').count());
-    if lines < min_lines {
-        return None;
-    }
-
-    let linked_location = name_range.map(|range| FileRange { file_id, range });
-    acc.push(InlayHint {
-        range: closing_token.text_range(),
-        kind: InlayKind::ClosingBraceHint,
-        label: InlayHintLabel { parts: vec![InlayHintLabelPart { text: label, linked_location }] },
-        tooltip: None, // provided by label part location
-    });
-
-    None
-}
-
-fn implicit_static_hints(
-    acc: &mut Vec<InlayHint>,
-    config: &InlayHintsConfig,
-    statik_or_const: Either<ast::Static, ast::Const>,
-) -> Option<()> {
-    if config.lifetime_elision_hints != LifetimeElisionHints::Always {
-        return None;
-    }
-
-    if let Either::Right(it) = &statik_or_const {
-        if ast::AssocItemList::can_cast(
-            it.syntax().parent().map_or(SyntaxKind::EOF, |it| it.kind()),
-        ) {
-            return None;
-        }
-    }
-
-    if let Some(ast::Type::RefType(ty)) = statik_or_const.either(|it| it.ty(), |it| it.ty()) {
-        if ty.lifetime().is_none() {
-            let t = ty.amp_token()?;
-            acc.push(InlayHint {
-                range: t.text_range(),
-                kind: InlayKind::LifetimeHint,
-                label: "'static".to_owned().into(),
-                tooltip: Some(InlayTooltip::String("Elided static lifetime".into())),
-            });
-        }
-    }
-
-    Some(())
-}
-
-fn fn_lifetime_fn_hints(
-    acc: &mut Vec<InlayHint>,
-    config: &InlayHintsConfig,
-    func: ast::Fn,
-) -> Option<()> {
-    if config.lifetime_elision_hints == LifetimeElisionHints::Never {
-        return None;
-    }
-
-    let mk_lt_hint = |t: SyntaxToken, label: String| InlayHint {
-        range: t.text_range(),
-        kind: InlayKind::LifetimeHint,
-        label: label.into(),
-        tooltip: Some(InlayTooltip::String("Elided lifetime".into())),
-    };
-
-    let param_list = func.param_list()?;
-    let generic_param_list = func.generic_param_list();
-    let ret_type = func.ret_type();
-    let self_param = param_list.self_param().filter(|it| it.amp_token().is_some());
-
-    let is_elided = |lt: &Option<ast::Lifetime>| match lt {
-        Some(lt) => matches!(lt.text().as_str(), "'_"),
-        None => true,
-    };
-
-    let potential_lt_refs = {
-        let mut acc: Vec<_> = vec![];
-        if let Some(self_param) = &self_param {
-            let lifetime = self_param.lifetime();
-            let is_elided = is_elided(&lifetime);
-            acc.push((None, self_param.amp_token(), lifetime, is_elided));
-        }
-        param_list.params().filter_map(|it| Some((it.pat(), it.ty()?))).for_each(|(pat, ty)| {
-            // FIXME: check path types
-            walk_ty(&ty, &mut |ty| match ty {
-                ast::Type::RefType(r) => {
-                    let lifetime = r.lifetime();
-                    let is_elided = is_elided(&lifetime);
-                    acc.push((
-                        pat.as_ref().and_then(|it| match it {
-                            ast::Pat::IdentPat(p) => p.name(),
-                            _ => None,
-                        }),
-                        r.amp_token(),
-                        lifetime,
-                        is_elided,
-                    ))
-                }
-                _ => (),
-            })
-        });
-        acc
-    };
-
-    // allocate names
-    let mut gen_idx_name = {
-        let mut gen = (0u8..).map(|idx| match idx {
-            idx if idx < 10 => SmolStr::from_iter(['\'', (idx + 48) as char]),
-            idx => format!("'{idx}").into(),
-        });
-        move || gen.next().unwrap_or_default()
-    };
-    let mut allocated_lifetimes = vec![];
-
-    let mut used_names: FxHashMap<SmolStr, usize> =
-        match config.param_names_for_lifetime_elision_hints {
-            true => generic_param_list
-                .iter()
-                .flat_map(|gpl| gpl.lifetime_params())
-                .filter_map(|param| param.lifetime())
-                .filter_map(|lt| Some((SmolStr::from(lt.text().as_str().get(1..)?), 0)))
-                .collect(),
-            false => Default::default(),
-        };
-    {
-        let mut potential_lt_refs = potential_lt_refs.iter().filter(|&&(.., is_elided)| is_elided);
-        if let Some(_) = &self_param {
-            if let Some(_) = potential_lt_refs.next() {
-                allocated_lifetimes.push(if config.param_names_for_lifetime_elision_hints {
-                    // self can't be used as a lifetime, so no need to check for collisions
-                    "'self".into()
-                } else {
-                    gen_idx_name()
-                });
-            }
-        }
-        potential_lt_refs.for_each(|(name, ..)| {
-            let name = match name {
-                Some(it) if config.param_names_for_lifetime_elision_hints => {
-                    if let Some(c) = used_names.get_mut(it.text().as_str()) {
-                        *c += 1;
-                        SmolStr::from(format!("'{text}{c}", text = it.text().as_str()))
-                    } else {
-                        used_names.insert(it.text().as_str().into(), 0);
-                        SmolStr::from_iter(["\'", it.text().as_str()])
-                    }
-                }
-                _ => gen_idx_name(),
-            };
-            allocated_lifetimes.push(name);
-        });
-    }
-
-    // fetch output lifetime if elision rule applies
-    let output = match potential_lt_refs.as_slice() {
-        [(_, _, lifetime, _), ..] if self_param.is_some() || potential_lt_refs.len() == 1 => {
-            match lifetime {
-                Some(lt) => match lt.text().as_str() {
-                    "'_" => allocated_lifetimes.get(0).cloned(),
-                    "'static" => None,
-                    name => Some(name.into()),
-                },
-                None => allocated_lifetimes.get(0).cloned(),
-            }
-        }
-        [..] => None,
-    };
-
-    if allocated_lifetimes.is_empty() && output.is_none() {
-        return None;
-    }
-
-    // apply hints
-    // apply output if required
-    let mut is_trivial = true;
-    if let (Some(output_lt), Some(r)) = (&output, ret_type) {
-        if let Some(ty) = r.ty() {
-            walk_ty(&ty, &mut |ty| match ty {
-                ast::Type::RefType(ty) if ty.lifetime().is_none() => {
-                    if let Some(amp) = ty.amp_token() {
-                        is_trivial = false;
-                        acc.push(mk_lt_hint(amp, output_lt.to_string()));
-                    }
-                }
-                _ => (),
-            })
-        }
-    }
-
-    if config.lifetime_elision_hints == LifetimeElisionHints::SkipTrivial && is_trivial {
-        return None;
-    }
-
-    let mut a = allocated_lifetimes.iter();
-    for (_, amp_token, _, is_elided) in potential_lt_refs {
-        if is_elided {
-            let t = amp_token?;
-            let lt = a.next()?;
-            acc.push(mk_lt_hint(t, lt.to_string()));
-        }
-    }
-
-    // generate generic param list things
-    match (generic_param_list, allocated_lifetimes.as_slice()) {
-        (_, []) => (),
-        (Some(gpl), allocated_lifetimes) => {
-            let angle_tok = gpl.l_angle_token()?;
-            let is_empty = gpl.generic_params().next().is_none();
-            acc.push(InlayHint {
-                range: angle_tok.text_range(),
-                kind: InlayKind::LifetimeHint,
-                label: format!(
-                    "{}{}",
-                    allocated_lifetimes.iter().format(", "),
-                    if is_empty { "" } else { ", " }
-                )
-                .into(),
-                tooltip: Some(InlayTooltip::String("Elided lifetimes".into())),
-            });
-        }
-        (None, allocated_lifetimes) => acc.push(InlayHint {
-            range: func.name()?.syntax().text_range(),
-            kind: InlayKind::GenericParamListHint,
-            label: format!("<{}>", allocated_lifetimes.iter().format(", "),).into(),
-            tooltip: Some(InlayTooltip::String("Elided lifetimes".into())),
-        }),
-    }
-    Some(())
-}
-
-fn closure_ret_hints(
-    acc: &mut Vec<InlayHint>,
-    sema: &Semantics<'_, RootDatabase>,
-    famous_defs: &FamousDefs<'_, '_>,
-    config: &InlayHintsConfig,
-    file_id: FileId,
-    closure: ast::ClosureExpr,
-) -> Option<()> {
-    if config.closure_return_type_hints == ClosureReturnTypeHints::Never {
-        return None;
-    }
-
-    if closure.ret_type().is_some() {
-        return None;
-    }
-
-    if !closure_has_block_body(&closure)
-        && config.closure_return_type_hints == ClosureReturnTypeHints::WithBlock
-    {
-        return None;
-    }
-
-    let param_list = closure.param_list()?;
-
-    let closure = sema.descend_node_into_attributes(closure.clone()).pop()?;
-    let ty = sema.type_of_expr(&ast::Expr::ClosureExpr(closure))?.adjusted();
-    let callable = ty.as_callable(sema.db)?;
-    let ty = callable.return_type();
-    if ty.is_unit() {
-        return None;
-    }
-    acc.push(InlayHint {
-        range: param_list.syntax().text_range(),
-        kind: InlayKind::ClosureReturnTypeHint,
-        label: hint_iterator(sema, &famous_defs, config, &ty)
-            .unwrap_or_else(|| ty.display_truncated(sema.db, config.max_length).to_string())
-            .into(),
-        tooltip: Some(InlayTooltip::HoverRanged(file_id, param_list.syntax().text_range())),
-    });
-    Some(())
-}
-
-fn adjustment_hints(
-    acc: &mut Vec<InlayHint>,
-    sema: &Semantics<'_, RootDatabase>,
-    config: &InlayHintsConfig,
-    expr: &ast::Expr,
-) -> Option<()> {
-    if config.adjustment_hints == AdjustmentHints::Never {
-        return None;
-    }
-
-    if let ast::Expr::ParenExpr(_) = expr {
-        // These inherit from the inner expression which would result in duplicate hints
-        return None;
-    }
-
-    let parent = expr.syntax().parent().and_then(ast::Expr::cast);
-    let descended = sema.descend_node_into_attributes(expr.clone()).pop();
-    let desc_expr = descended.as_ref().unwrap_or(expr);
-    let adjustments = sema.expr_adjustments(desc_expr).filter(|it| !it.is_empty())?;
-    let needs_parens = match parent {
-        Some(parent) => {
-            match parent {
-                ast::Expr::AwaitExpr(_)
-                | ast::Expr::CallExpr(_)
-                | ast::Expr::CastExpr(_)
-                | ast::Expr::FieldExpr(_)
-                | ast::Expr::MethodCallExpr(_)
-                | ast::Expr::TryExpr(_) => true,
-                // FIXME: shorthands need special casing, though not sure if adjustments are even valid there
-                ast::Expr::RecordExpr(_) => false,
-                ast::Expr::IndexExpr(index) => index.base().as_ref() == Some(expr),
-                _ => false,
-            }
-        }
-        None => false,
-    };
-    if needs_parens {
-        acc.push(InlayHint {
-            range: expr.syntax().text_range(),
-            kind: InlayKind::AdjustmentHint,
-            label: "(".into(),
-            tooltip: None,
-        });
-    }
-    for adjustment in adjustments.into_iter().rev() {
-        // FIXME: Add some nicer tooltips to each of these
-        let text = match adjustment {
-            Adjust::NeverToAny if config.adjustment_hints == AdjustmentHints::Always => {
-                "<never-to-any>"
-            }
-            Adjust::Deref(None) => "*",
-            Adjust::Deref(Some(OverloadedDeref(Mutability::Mut))) => "*",
-            Adjust::Deref(Some(OverloadedDeref(Mutability::Shared))) => "*",
-            Adjust::Borrow(AutoBorrow::Ref(Mutability::Shared)) => "&",
-            Adjust::Borrow(AutoBorrow::Ref(Mutability::Mut)) => "&mut ",
-            Adjust::Borrow(AutoBorrow::RawPtr(Mutability::Shared)) => "&raw const ",
-            Adjust::Borrow(AutoBorrow::RawPtr(Mutability::Mut)) => "&raw mut ",
-            // some of these could be represented via `as` casts, but that's not too nice and
-            // handling everything as a prefix expr makes the `(` and `)` insertion easier
-            Adjust::Pointer(cast) if config.adjustment_hints == AdjustmentHints::Always => {
-                match cast {
-                    PointerCast::ReifyFnPointer => "<fn-item-to-fn-pointer>",
-                    PointerCast::UnsafeFnPointer => "<safe-fn-pointer-to-unsafe-fn-pointer>",
-                    PointerCast::ClosureFnPointer(Safety::Unsafe) => {
-                        "<closure-to-unsafe-fn-pointer>"
-                    }
-                    PointerCast::ClosureFnPointer(Safety::Safe) => "<closure-to-fn-pointer>",
-                    PointerCast::MutToConstPointer => "<mut-ptr-to-const-ptr>",
-                    PointerCast::ArrayToPointer => "<array-ptr-to-element-ptr>",
-                    PointerCast::Unsize => "<unsize>",
-                }
-            }
-            _ => continue,
-        };
-        acc.push(InlayHint {
-            range: expr.syntax().text_range(),
-            kind: InlayKind::AdjustmentHint,
-            label: text.into(),
-            tooltip: None,
-        });
-    }
-    if needs_parens {
-        acc.push(InlayHint {
-            range: expr.syntax().text_range(),
-            kind: InlayKind::AdjustmentHintClosingParenthesis,
-            label: ")".into(),
-            tooltip: None,
-        });
-    }
-    Some(())
-}
-
-fn chaining_hints(
-    acc: &mut Vec<InlayHint>,
-    sema: &Semantics<'_, RootDatabase>,
-    famous_defs: &FamousDefs<'_, '_>,
-    config: &InlayHintsConfig,
-    file_id: FileId,
-    expr: &ast::Expr,
-) -> Option<()> {
-    if !config.chaining_hints {
-        return None;
-    }
-
-    if matches!(expr, ast::Expr::RecordExpr(_)) {
-        return None;
-    }
-
-    let descended = sema.descend_node_into_attributes(expr.clone()).pop();
-    let desc_expr = descended.as_ref().unwrap_or(expr);
-
-    let mut tokens = expr
-        .syntax()
-        .siblings_with_tokens(Direction::Next)
-        .filter_map(NodeOrToken::into_token)
-        .filter(|t| match t.kind() {
-            SyntaxKind::WHITESPACE if !t.text().contains('\n') => false,
-            SyntaxKind::COMMENT => false,
-            _ => true,
-        });
-
-    // Chaining can be defined as an expression whose next sibling tokens are newline and dot
-    // Ignoring extra whitespace and comments
-    let next = tokens.next()?.kind();
-    if next == SyntaxKind::WHITESPACE {
-        let mut next_next = tokens.next()?.kind();
-        while next_next == SyntaxKind::WHITESPACE {
-            next_next = tokens.next()?.kind();
-        }
-        if next_next == T![.] {
-            let ty = sema.type_of_expr(desc_expr)?.original;
-            if ty.is_unknown() {
-                return None;
-            }
-            if matches!(expr, ast::Expr::PathExpr(_)) {
-                if let Some(hir::Adt::Struct(st)) = ty.as_adt() {
-                    if st.fields(sema.db).is_empty() {
-                        return None;
-                    }
-                }
-            }
-            acc.push(InlayHint {
-                range: expr.syntax().text_range(),
-                kind: InlayKind::ChainingHint,
-                label: hint_iterator(sema, &famous_defs, config, &ty)
-                    .unwrap_or_else(|| ty.display_truncated(sema.db, config.max_length).to_string())
-                    .into(),
-                tooltip: Some(InlayTooltip::HoverRanged(file_id, expr.syntax().text_range())),
-            });
-        }
-    }
-    Some(())
-}
-
-fn param_name_hints(
-    acc: &mut Vec<InlayHint>,
-    sema: &Semantics<'_, RootDatabase>,
-    config: &InlayHintsConfig,
-    expr: ast::Expr,
-) -> Option<()> {
-    if !config.parameter_hints {
-        return None;
-    }
-
-    let (callable, arg_list) = get_callable(sema, &expr)?;
-    let hints = callable
-        .params(sema.db)
-        .into_iter()
-        .zip(arg_list.args())
-        .filter_map(|((param, _ty), arg)| {
-            // Only annotate hints for expressions that exist in the original file
-            let range = sema.original_range_opt(arg.syntax())?;
-            let (param_name, name_syntax) = match param.as_ref()? {
-                Either::Left(pat) => ("self".to_string(), pat.name()),
-                Either::Right(pat) => match pat {
-                    ast::Pat::IdentPat(it) => (it.name()?.to_string(), it.name()),
-                    _ => return None,
-                },
-            };
-            Some((name_syntax, param_name, arg, range))
-        })
-        .filter(|(_, param_name, arg, _)| {
-            !should_hide_param_name_hint(sema, &callable, param_name, arg)
-        })
-        .map(|(param, param_name, _, FileRange { range, .. })| {
-            let mut tooltip = None;
-            if let Some(name) = param {
-                if let hir::CallableKind::Function(f) = callable.kind() {
-                    // assert the file is cached so we can map out of macros
-                    if let Some(_) = sema.source(f) {
-                        tooltip = sema.original_range_opt(name.syntax());
-                    }
-                }
-            }
-
-            InlayHint {
-                range,
-                kind: InlayKind::ParameterHint,
-                label: param_name.into(),
-                tooltip: tooltip.map(|it| InlayTooltip::HoverOffset(it.file_id, it.range.start())),
-            }
-        });
-
-    acc.extend(hints);
-    Some(())
-}
-
-fn binding_mode_hints(
-    acc: &mut Vec<InlayHint>,
-    sema: &Semantics<'_, RootDatabase>,
-    config: &InlayHintsConfig,
-    pat: &ast::Pat,
-) -> Option<()> {
-    if !config.binding_mode_hints {
-        return None;
-    }
-
-    let range = pat.syntax().text_range();
-    sema.pattern_adjustments(&pat).iter().for_each(|ty| {
-        let reference = ty.is_reference();
-        let mut_reference = ty.is_mutable_reference();
-        let r = match (reference, mut_reference) {
-            (true, true) => "&mut",
-            (true, false) => "&",
-            _ => return,
-        };
-        acc.push(InlayHint {
-            range,
-            kind: InlayKind::BindingModeHint,
-            label: r.to_string().into(),
-            tooltip: Some(InlayTooltip::String("Inferred binding mode".into())),
-        });
-    });
-    match pat {
-        ast::Pat::IdentPat(pat) if pat.ref_token().is_none() && pat.mut_token().is_none() => {
-            let bm = sema.binding_mode_of_pat(pat)?;
-            let bm = match bm {
-                hir::BindingMode::Move => return None,
-                hir::BindingMode::Ref(Mutability::Mut) => "ref mut",
-                hir::BindingMode::Ref(Mutability::Shared) => "ref",
-            };
-            acc.push(InlayHint {
-                range,
-                kind: InlayKind::BindingModeHint,
-                label: bm.to_string().into(),
-                tooltip: Some(InlayTooltip::String("Inferred binding mode".into())),
-            });
-        }
-        _ => (),
-    }
-
-    Some(())
-}
-
-fn bind_pat_hints(
-    acc: &mut Vec<InlayHint>,
-    sema: &Semantics<'_, RootDatabase>,
-    config: &InlayHintsConfig,
-    file_id: FileId,
-    pat: &ast::IdentPat,
-) -> Option<()> {
-    if !config.type_hints {
-        return None;
-    }
-
-    let descended = sema.descend_node_into_attributes(pat.clone()).pop();
-    let desc_pat = descended.as_ref().unwrap_or(pat);
-    let ty = sema.type_of_pat(&desc_pat.clone().into())?.original;
-
-    if should_not_display_type_hint(sema, config, pat, &ty) {
-        return None;
-    }
-
-    let krate = sema.scope(desc_pat.syntax())?.krate();
-    let famous_defs = FamousDefs(sema, krate);
-    let label = hint_iterator(sema, &famous_defs, config, &ty);
-
-    let label = match label {
-        Some(label) => label,
-        None => {
-            let ty_name = ty.display_truncated(sema.db, config.max_length).to_string();
-            if config.hide_named_constructor_hints
-                && is_named_constructor(sema, pat, &ty_name).is_some()
-            {
-                return None;
-            }
-            ty_name
-        }
-    };
-
-    acc.push(InlayHint {
-        range: match pat.name() {
-            Some(name) => name.syntax().text_range(),
-            None => pat.syntax().text_range(),
-        },
-        kind: InlayKind::TypeHint,
-        label: label.into(),
-        tooltip: pat
-            .name()
-            .map(|it| it.syntax().text_range())
-            .map(|it| InlayTooltip::HoverRanged(file_id, it)),
-    });
-
-    Some(())
-}
-
-fn is_named_constructor(
-    sema: &Semantics<'_, RootDatabase>,
-    pat: &ast::IdentPat,
-    ty_name: &str,
-) -> Option<()> {
-    let let_node = pat.syntax().parent()?;
-    let expr = match_ast! {
-        match let_node {
-            ast::LetStmt(it) => it.initializer(),
-            ast::LetExpr(it) => it.expr(),
-            _ => None,
-        }
-    }?;
-
-    let expr = sema.descend_node_into_attributes(expr.clone()).pop().unwrap_or(expr);
-    // unwrap postfix expressions
-    let expr = match expr {
-        ast::Expr::TryExpr(it) => it.expr(),
-        ast::Expr::AwaitExpr(it) => it.expr(),
-        expr => Some(expr),
-    }?;
-    let expr = match expr {
-        ast::Expr::CallExpr(call) => match call.expr()? {
-            ast::Expr::PathExpr(path) => path,
-            _ => return None,
-        },
-        ast::Expr::PathExpr(path) => path,
-        _ => return None,
-    };
-    let path = expr.path()?;
-
-    let callable = sema.type_of_expr(&ast::Expr::PathExpr(expr))?.original.as_callable(sema.db);
-    let callable_kind = callable.map(|it| it.kind());
-    let qual_seg = match callable_kind {
-        Some(hir::CallableKind::Function(_) | hir::CallableKind::TupleEnumVariant(_)) => {
-            path.qualifier()?.segment()
-        }
-        _ => path.segment(),
-    }?;
-
-    let ctor_name = match qual_seg.kind()? {
-        ast::PathSegmentKind::Name(name_ref) => {
-            match qual_seg.generic_arg_list().map(|it| it.generic_args()) {
-                Some(generics) => format!("{}<{}>", name_ref, generics.format(", ")),
-                None => name_ref.to_string(),
-            }
-        }
-        ast::PathSegmentKind::Type { type_ref: Some(ty), trait_ref: None } => ty.to_string(),
-        _ => return None,
-    };
-    (ctor_name == ty_name).then(|| ())
-}
-
-/// Checks if the type is an Iterator from std::iter and replaces its hint with an `impl Iterator<Item = Ty>`.
+/// Checks if the type is an Iterator from std::iter and returns its item type.
 fn hint_iterator(
     sema: &Semantics<'_, RootDatabase>,
     famous_defs: &FamousDefs<'_, '_>,
-    config: &InlayHintsConfig,
     ty: &hir::Type,
-) -> Option<String> {
+) -> Option<hir::Type> {
     let db = sema.db;
     let strukt = ty.strip_references().as_adt()?;
     let krate = strukt.module(db).krate();
@@ -1016,289 +423,32 @@ fn hint_iterator(
             _ => None,
         })?;
         if let Some(ty) = ty.normalize_trait_assoc_type(db, &[], assoc_type_item) {
-            const LABEL_START: &str = "impl Iterator<Item = ";
-            const LABEL_END: &str = ">";
-
-            let ty_display = hint_iterator(sema, famous_defs, config, &ty)
-                .map(|assoc_type_impl| assoc_type_impl.to_string())
-                .unwrap_or_else(|| {
-                    ty.display_truncated(
-                        db,
-                        config
-                            .max_length
-                            .map(|len| len.saturating_sub(LABEL_START.len() + LABEL_END.len())),
-                    )
-                    .to_string()
-                });
-            return Some(format!("{}{}{}", LABEL_START, ty_display, LABEL_END));
+            return Some(ty);
         }
     }
 
     None
 }
 
-fn pat_is_enum_variant(db: &RootDatabase, bind_pat: &ast::IdentPat, pat_ty: &hir::Type) -> bool {
-    if let Some(hir::Adt::Enum(enum_data)) = pat_ty.as_adt() {
-        let pat_text = bind_pat.to_string();
-        enum_data
-            .variants(db)
-            .into_iter()
-            .map(|variant| variant.name(db).to_smol_str())
-            .any(|enum_name| enum_name == pat_text)
-    } else {
-        false
-    }
-}
-
-fn should_not_display_type_hint(
-    sema: &Semantics<'_, RootDatabase>,
-    config: &InlayHintsConfig,
-    bind_pat: &ast::IdentPat,
-    pat_ty: &hir::Type,
-) -> bool {
-    let db = sema.db;
-
-    if pat_ty.is_unknown() {
-        return true;
-    }
-
-    if let Some(hir::Adt::Struct(s)) = pat_ty.as_adt() {
-        if s.fields(db).is_empty() && s.name(db).to_smol_str() == bind_pat.to_string() {
-            return true;
-        }
-    }
-
-    if config.hide_closure_initialization_hints {
-        if let Some(parent) = bind_pat.syntax().parent() {
-            if let Some(it) = ast::LetStmt::cast(parent.clone()) {
-                if let Some(ast::Expr::ClosureExpr(closure)) = it.initializer() {
-                    if closure_has_block_body(&closure) {
-                        return true;
-                    }
-                }
-            }
-        }
-    }
-
-    for node in bind_pat.syntax().ancestors() {
-        match_ast! {
-            match node {
-                ast::LetStmt(it) => return it.ty().is_some(),
-                // FIXME: We might wanna show type hints in parameters for non-top level patterns as well
-                ast::Param(it) => return it.ty().is_some(),
-                ast::MatchArm(_) => return pat_is_enum_variant(db, bind_pat, pat_ty),
-                ast::LetExpr(_) => return pat_is_enum_variant(db, bind_pat, pat_ty),
-                ast::IfExpr(_) => return false,
-                ast::WhileExpr(_) => return false,
-                ast::ForExpr(it) => {
-                    // We *should* display hint only if user provided "in {expr}" and we know the type of expr (and it's not unit).
-                    // Type of expr should be iterable.
-                    return it.in_token().is_none() ||
-                        it.iterable()
-                            .and_then(|iterable_expr| sema.type_of_expr(&iterable_expr))
-                            .map(TypeInfo::original)
-                            .map_or(true, |iterable_ty| iterable_ty.is_unknown() || iterable_ty.is_unit())
-                },
-                _ => (),
-            }
-        }
-    }
-    false
-}
-
 fn closure_has_block_body(closure: &ast::ClosureExpr) -> bool {
     matches!(closure.body(), Some(ast::Expr::BlockExpr(_)))
 }
 
-fn should_hide_param_name_hint(
-    sema: &Semantics<'_, RootDatabase>,
-    callable: &hir::Callable,
-    param_name: &str,
-    argument: &ast::Expr,
-) -> bool {
-    // These are to be tested in the `parameter_hint_heuristics` test
-    // hide when:
-    // - the parameter name is a suffix of the function's name
-    // - the argument is a qualified constructing or call expression where the qualifier is an ADT
-    // - exact argument<->parameter match(ignoring leading underscore) or parameter is a prefix/suffix
-    //   of argument with _ splitting it off
-    // - param starts with `ra_fixture`
-    // - param is a well known name in a unary function
-
-    let param_name = param_name.trim_start_matches('_');
-    if param_name.is_empty() {
-        return true;
-    }
-
-    if matches!(argument, ast::Expr::PrefixExpr(prefix) if prefix.op_kind() == Some(UnaryOp::Not)) {
-        return false;
-    }
-
-    let fn_name = match callable.kind() {
-        hir::CallableKind::Function(it) => Some(it.name(sema.db).to_smol_str()),
-        _ => None,
-    };
-    let fn_name = fn_name.as_deref();
-    is_param_name_suffix_of_fn_name(param_name, callable, fn_name)
-        || is_argument_similar_to_param_name(argument, param_name)
-        || param_name.starts_with("ra_fixture")
-        || (callable.n_params() == 1 && is_obvious_param(param_name))
-        || is_adt_constructor_similar_to_param_name(sema, argument, param_name)
-}
-
-fn is_argument_similar_to_param_name(argument: &ast::Expr, param_name: &str) -> bool {
-    // check whether param_name and argument are the same or
-    // whether param_name is a prefix/suffix of argument(split at `_`)
-    let argument = match get_string_representation(argument) {
-        Some(argument) => argument,
-        None => return false,
-    };
-
-    // std is honestly too panic happy...
-    let str_split_at = |str: &str, at| str.is_char_boundary(at).then(|| argument.split_at(at));
-
-    let param_name = param_name.trim_start_matches('_');
-    let argument = argument.trim_start_matches('_');
-
-    match str_split_at(argument, param_name.len()) {
-        Some((prefix, rest)) if prefix.eq_ignore_ascii_case(param_name) => {
-            return rest.is_empty() || rest.starts_with('_');
-        }
-        _ => (),
-    }
-    match argument.len().checked_sub(param_name.len()).and_then(|at| str_split_at(argument, at)) {
-        Some((rest, suffix)) if param_name.eq_ignore_ascii_case(suffix) => {
-            return rest.is_empty() || rest.ends_with('_');
-        }
-        _ => (),
-    }
-    false
-}
-
-/// Hide the parameter name of a unary function if it is a `_` - prefixed suffix of the function's name, or equal.
-///
-/// `fn strip_suffix(suffix)` will be hidden.
-/// `fn stripsuffix(suffix)` will not be hidden.
-fn is_param_name_suffix_of_fn_name(
-    param_name: &str,
-    callable: &Callable,
-    fn_name: Option<&str>,
-) -> bool {
-    match (callable.n_params(), fn_name) {
-        (1, Some(function)) => {
-            function == param_name
-                || function
-                    .len()
-                    .checked_sub(param_name.len())
-                    .and_then(|at| function.is_char_boundary(at).then(|| function.split_at(at)))
-                    .map_or(false, |(prefix, suffix)| {
-                        suffix.eq_ignore_ascii_case(param_name) && prefix.ends_with('_')
-                    })
-        }
-        _ => false,
-    }
-}
-
-fn is_adt_constructor_similar_to_param_name(
-    sema: &Semantics<'_, RootDatabase>,
-    argument: &ast::Expr,
-    param_name: &str,
-) -> bool {
-    let path = match argument {
-        ast::Expr::CallExpr(c) => c.expr().and_then(|e| match e {
-            ast::Expr::PathExpr(p) => p.path(),
-            _ => None,
-        }),
-        ast::Expr::PathExpr(p) => p.path(),
-        ast::Expr::RecordExpr(r) => r.path(),
-        _ => return false,
-    };
-    let path = match path {
-        Some(it) => it,
-        None => return false,
-    };
-    (|| match sema.resolve_path(&path)? {
-        hir::PathResolution::Def(hir::ModuleDef::Adt(_)) => {
-            Some(to_lower_snake_case(&path.segment()?.name_ref()?.text()) == param_name)
-        }
-        hir::PathResolution::Def(hir::ModuleDef::Function(_) | hir::ModuleDef::Variant(_)) => {
-            if to_lower_snake_case(&path.segment()?.name_ref()?.text()) == param_name {
-                return Some(true);
-            }
-            let qual = path.qualifier()?;
-            match sema.resolve_path(&qual)? {
-                hir::PathResolution::Def(hir::ModuleDef::Adt(_)) => {
-                    Some(to_lower_snake_case(&qual.segment()?.name_ref()?.text()) == param_name)
-                }
-                _ => None,
-            }
-        }
-        _ => None,
-    })()
-    .unwrap_or(false)
-}
-
-fn get_string_representation(expr: &ast::Expr) -> Option<String> {
-    match expr {
-        ast::Expr::MethodCallExpr(method_call_expr) => {
-            let name_ref = method_call_expr.name_ref()?;
-            match name_ref.text().as_str() {
-                "clone" | "as_ref" => method_call_expr.receiver().map(|rec| rec.to_string()),
-                name_ref => Some(name_ref.to_owned()),
-            }
-        }
-        ast::Expr::MacroExpr(macro_expr) => {
-            Some(macro_expr.macro_call()?.path()?.segment()?.to_string())
-        }
-        ast::Expr::FieldExpr(field_expr) => Some(field_expr.name_ref()?.to_string()),
-        ast::Expr::PathExpr(path_expr) => Some(path_expr.path()?.segment()?.to_string()),
-        ast::Expr::PrefixExpr(prefix_expr) => get_string_representation(&prefix_expr.expr()?),
-        ast::Expr::RefExpr(ref_expr) => get_string_representation(&ref_expr.expr()?),
-        ast::Expr::CastExpr(cast_expr) => get_string_representation(&cast_expr.expr()?),
-        _ => None,
-    }
-}
-
-fn is_obvious_param(param_name: &str) -> bool {
-    // avoid displaying hints for common functions like map, filter, etc.
-    // or other obvious words used in std
-    let is_obvious_param_name =
-        matches!(param_name, "predicate" | "value" | "pat" | "rhs" | "other");
-    param_name.len() == 1 || is_obvious_param_name
-}
-
-fn get_callable(
-    sema: &Semantics<'_, RootDatabase>,
-    expr: &ast::Expr,
-) -> Option<(hir::Callable, ast::ArgList)> {
-    match expr {
-        ast::Expr::CallExpr(expr) => {
-            let descended = sema.descend_node_into_attributes(expr.clone()).pop();
-            let expr = descended.as_ref().unwrap_or(expr);
-            sema.type_of_expr(&expr.expr()?)?.original.as_callable(sema.db).zip(expr.arg_list())
-        }
-        ast::Expr::MethodCallExpr(expr) => {
-            let descended = sema.descend_node_into_attributes(expr.clone()).pop();
-            let expr = descended.as_ref().unwrap_or(expr);
-            sema.resolve_method_call_as_callable(expr).zip(expr.arg_list())
-        }
-        _ => None,
-    }
-}
-
 #[cfg(test)]
 mod tests {
-    use expect_test::{expect, Expect};
+    use expect_test::Expect;
     use itertools::Itertools;
-    use syntax::{TextRange, TextSize};
     use test_utils::extract_annotations;
 
-    use crate::inlay_hints::AdjustmentHints;
+    use crate::inlay_hints::{AdjustmentHints, AdjustmentHintsMode};
+    use crate::DiscriminantHints;
     use crate::{fixture, inlay_hints::InlayHintsConfig, LifetimeElisionHints};
 
     use super::ClosureReturnTypeHints;
 
-    const DISABLED_CONFIG: InlayHintsConfig = InlayHintsConfig {
+    pub(super) const DISABLED_CONFIG: InlayHintsConfig = InlayHintsConfig {
+        location_links: false,
+        discriminant_hints: DiscriminantHints::Never,
         render_colons: false,
         type_hints: false,
         parameter_hints: false,
@@ -1306,6 +456,8 @@ mod tests {
         lifetime_elision_hints: LifetimeElisionHints::Never,
         closure_return_type_hints: ClosureReturnTypeHints::Never,
         adjustment_hints: AdjustmentHints::Never,
+        adjustment_hints_mode: AdjustmentHintsMode::Prefix,
+        adjustment_hints_hide_outside_unsafe: false,
         binding_mode_hints: false,
         hide_named_constructor_hints: false,
         hide_closure_initialization_hints: false,
@@ -1313,43 +465,27 @@ mod tests {
         max_length: None,
         closing_brace_hints_min_lines: None,
     };
-    const TEST_CONFIG: InlayHintsConfig = InlayHintsConfig {
+    pub(super) const DISABLED_CONFIG_WITH_LINKS: InlayHintsConfig =
+        InlayHintsConfig { location_links: true, ..DISABLED_CONFIG };
+    pub(super) const TEST_CONFIG: InlayHintsConfig = InlayHintsConfig {
         type_hints: true,
         parameter_hints: true,
         chaining_hints: true,
         closure_return_type_hints: ClosureReturnTypeHints::WithBlock,
         binding_mode_hints: true,
         lifetime_elision_hints: LifetimeElisionHints::Always,
-        ..DISABLED_CONFIG
+        ..DISABLED_CONFIG_WITH_LINKS
     };
 
     #[track_caller]
-    fn check(ra_fixture: &str) {
+    pub(super) fn check(ra_fixture: &str) {
         check_with_config(TEST_CONFIG, ra_fixture);
     }
 
     #[track_caller]
-    fn check_params(ra_fixture: &str) {
-        check_with_config(
-            InlayHintsConfig { parameter_hints: true, ..DISABLED_CONFIG },
-            ra_fixture,
-        );
-    }
-
-    #[track_caller]
-    fn check_types(ra_fixture: &str) {
-        check_with_config(InlayHintsConfig { type_hints: true, ..DISABLED_CONFIG }, ra_fixture);
-    }
-
-    #[track_caller]
-    fn check_chains(ra_fixture: &str) {
-        check_with_config(InlayHintsConfig { chaining_hints: true, ..DISABLED_CONFIG }, ra_fixture);
-    }
-
-    #[track_caller]
-    fn check_with_config(config: InlayHintsConfig, ra_fixture: &str) {
+    pub(super) fn check_with_config(config: InlayHintsConfig, ra_fixture: &str) {
         let (analysis, file_id) = fixture::file(ra_fixture);
-        let mut expected = extract_annotations(&*analysis.file_text(file_id).unwrap());
+        let mut expected = extract_annotations(&analysis.file_text(file_id).unwrap());
         let inlay_hints = analysis.inlay_hints(&config, file_id, None).unwrap();
         let actual = inlay_hints
             .into_iter()
@@ -1358,11 +494,11 @@ mod tests {
             .collect::<Vec<_>>();
         expected.sort_by_key(|(range, _)| range.start());
 
-        assert_eq!(expected, actual, "\nExpected:\n{:#?}\n\nActual:\n{:#?}", expected, actual);
+        assert_eq!(expected, actual, "\nExpected:\n{expected:#?}\n\nActual:\n{actual:#?}");
     }
 
     #[track_caller]
-    fn check_expect(config: InlayHintsConfig, ra_fixture: &str, expect: Expect) {
+    pub(super) fn check_expect(config: InlayHintsConfig, ra_fixture: &str, expect: Expect) {
         let (analysis, file_id) = fixture::file(ra_fixture);
         let inlay_hints = analysis.inlay_hints(&config, file_id, None).unwrap();
         expect.assert_debug_eq(&inlay_hints)
@@ -1379,1720 +515,4 @@ fn main() {
 }"#,
         );
     }
-
-    // Parameter hint tests
-
-    #[test]
-    fn param_hints_only() {
-        check_params(
-            r#"
-fn foo(a: i32, b: i32) -> i32 { a + b }
-fn main() {
-    let _x = foo(
-        4,
-      //^ a
-        4,
-      //^ b
-    );
-}"#,
-        );
-    }
-
-    #[test]
-    fn param_hints_on_closure() {
-        check_params(
-            r#"
-fn main() {
-    let clo = |a: u8, b: u8| a + b;
-    clo(
-        1,
-      //^ a
-        2,
-      //^ b
-    );
-}
-            "#,
-        );
-    }
-
-    #[test]
-    fn param_name_similar_to_fn_name_still_hints() {
-        check_params(
-            r#"
-fn max(x: i32, y: i32) -> i32 { x + y }
-fn main() {
-    let _x = max(
-        4,
-      //^ x
-        4,
-      //^ y
-    );
-}"#,
-        );
-    }
-
-    #[test]
-    fn param_name_similar_to_fn_name() {
-        check_params(
-            r#"
-fn param_with_underscore(with_underscore: i32) -> i32 { with_underscore }
-fn main() {
-    let _x = param_with_underscore(
-        4,
-    );
-}"#,
-        );
-        check_params(
-            r#"
-fn param_with_underscore(underscore: i32) -> i32 { underscore }
-fn main() {
-    let _x = param_with_underscore(
-        4,
-    );
-}"#,
-        );
-    }
-
-    #[test]
-    fn param_name_same_as_fn_name() {
-        check_params(
-            r#"
-fn foo(foo: i32) -> i32 { foo }
-fn main() {
-    let _x = foo(
-        4,
-    );
-}"#,
-        );
-    }
-
-    #[test]
-    fn never_hide_param_when_multiple_params() {
-        check_params(
-            r#"
-fn foo(foo: i32, bar: i32) -> i32 { bar + baz }
-fn main() {
-    let _x = foo(
-        4,
-      //^ foo
-        8,
-      //^ bar
-    );
-}"#,
-        );
-    }
-
-    #[test]
-    fn param_hints_look_through_as_ref_and_clone() {
-        check_params(
-            r#"
-fn foo(bar: i32, baz: f32) {}
-
-fn main() {
-    let bar = 3;
-    let baz = &"baz";
-    let fez = 1.0;
-    foo(bar.clone(), bar.clone());
-                   //^^^^^^^^^^^ baz
-    foo(bar.as_ref(), bar.as_ref());
-                    //^^^^^^^^^^^^ baz
-}
-"#,
-        );
-    }
-
-    #[test]
-    fn self_param_hints() {
-        check_params(
-            r#"
-struct Foo;
-
-impl Foo {
-    fn foo(self: Self) {}
-    fn bar(self: &Self) {}
-}
-
-fn main() {
-    Foo::foo(Foo);
-           //^^^ self
-    Foo::bar(&Foo);
-           //^^^^ self
-}
-"#,
-        )
-    }
-
-    #[test]
-    fn param_name_hints_show_for_literals() {
-        check_params(
-            r#"pub fn test(a: i32, b: i32) -> [i32; 2] { [a, b] }
-fn main() {
-    test(
-        0xa_b,
-      //^^^^^ a
-        0xa_b,
-      //^^^^^ b
-    );
-}"#,
-        )
-    }
-
-    #[test]
-    fn function_call_parameter_hint() {
-        check_params(
-            r#"
-//- minicore: option
-struct FileId {}
-struct SmolStr {}
-
-struct TextRange {}
-struct SyntaxKind {}
-struct NavigationTarget {}
-
-struct Test {}
-
-impl Test {
-    fn method(&self, mut param: i32) -> i32 { param * 2 }
-
-    fn from_syntax(
-        file_id: FileId,
-        name: SmolStr,
-        focus_range: Option<TextRange>,
-        full_range: TextRange,
-        kind: SyntaxKind,
-        docs: Option<String>,
-    ) -> NavigationTarget {
-        NavigationTarget {}
-    }
-}
-
-fn test_func(mut foo: i32, bar: i32, msg: &str, _: i32, last: i32) -> i32 {
-    foo + bar
-}
-
-fn main() {
-    let not_literal = 1;
-    let _: i32 = test_func(1,    2,      "hello", 3,  not_literal);
-                         //^ foo ^ bar   ^^^^^^^ msg  ^^^^^^^^^^^ last
-    let t: Test = Test {};
-    t.method(123);
-           //^^^ param
-    Test::method(&t,      3456);
-               //^^ self  ^^^^ param
-    Test::from_syntax(
-        FileId {},
-        "impl".into(),
-      //^^^^^^^^^^^^^ name
-        None,
-      //^^^^ focus_range
-        TextRange {},
-      //^^^^^^^^^^^^ full_range
-        SyntaxKind {},
-      //^^^^^^^^^^^^^ kind
-        None,
-      //^^^^ docs
-    );
-}"#,
-        );
-    }
-
-    #[test]
-    fn parameter_hint_heuristics() {
-        check_params(
-            r#"
-fn check(ra_fixture_thing: &str) {}
-
-fn map(f: i32) {}
-fn filter(predicate: i32) {}
-
-fn strip_suffix(suffix: &str) {}
-fn stripsuffix(suffix: &str) {}
-fn same(same: u32) {}
-fn same2(_same2: u32) {}
-
-fn enum_matches_param_name(completion_kind: CompletionKind) {}
-
-fn foo(param: u32) {}
-fn bar(param_eter: u32) {}
-
-enum CompletionKind {
-    Keyword,
-}
-
-fn non_ident_pat((a, b): (u32, u32)) {}
-
-fn main() {
-    const PARAM: u32 = 0;
-    foo(PARAM);
-    foo(!PARAM);
-     // ^^^^^^ param
-    check("");
-
-    map(0);
-    filter(0);
-
-    strip_suffix("");
-    stripsuffix("");
-              //^^ suffix
-    same(0);
-    same2(0);
-
-    enum_matches_param_name(CompletionKind::Keyword);
-
-    let param = 0;
-    foo(param);
-    foo(param as _);
-    let param_end = 0;
-    foo(param_end);
-    let start_param = 0;
-    foo(start_param);
-    let param2 = 0;
-    foo(param2);
-      //^^^^^^ param
-
-    macro_rules! param {
-        () => {};
-    };
-    foo(param!());
-
-    let param_eter = 0;
-    bar(param_eter);
-    let param_eter_end = 0;
-    bar(param_eter_end);
-    let start_param_eter = 0;
-    bar(start_param_eter);
-    let param_eter2 = 0;
-    bar(param_eter2);
-      //^^^^^^^^^^^ param_eter
-
-    non_ident_pat((0, 0));
-}"#,
-        );
-    }
-
-    // Type-Hint tests
-
-    #[test]
-    fn type_hints_only() {
-        check_types(
-            r#"
-fn foo(a: i32, b: i32) -> i32 { a + b }
-fn main() {
-    let _x = foo(4, 4);
-      //^^ i32
-}"#,
-        );
-    }
-
-    #[test]
-    fn type_hints_bindings_after_at() {
-        check_types(
-            r#"
-//- minicore: option
-fn main() {
-    let ref foo @ bar @ ref mut baz = 0;
-          //^^^ &i32
-                //^^^ i32
-                              //^^^ &mut i32
-    let [x @ ..] = [0];
-       //^ [i32; 1]
-    if let x @ Some(_) = Some(0) {}
-         //^ Option<i32>
-    let foo @ (bar, baz) = (3, 3);
-      //^^^ (i32, i32)
-             //^^^ i32
-                  //^^^ i32
-}"#,
-        );
-    }
-
-    #[test]
-    fn default_generic_types_should_not_be_displayed() {
-        check(
-            r#"
-struct Test<K, T = u8> { k: K, t: T }
-
-fn main() {
-    let zz = Test { t: 23u8, k: 33 };
-      //^^ Test<i32>
-    let zz_ref = &zz;
-      //^^^^^^ &Test<i32>
-    let test = || zz;
-      //^^^^ || -> Test<i32>
-}"#,
-        );
-    }
-
-    #[test]
-    fn shorten_iterators_in_associated_params() {
-        check_types(
-            r#"
-//- minicore: iterators
-use core::iter;
-
-pub struct SomeIter<T> {}
-
-impl<T> SomeIter<T> {
-    pub fn new() -> Self { SomeIter {} }
-    pub fn push(&mut self, t: T) {}
-}
-
-impl<T> Iterator for SomeIter<T> {
-    type Item = T;
-    fn next(&mut self) -> Option<Self::Item> {
-        None
-    }
-}
-
-fn main() {
-    let mut some_iter = SomeIter::new();
-          //^^^^^^^^^ SomeIter<Take<Repeat<i32>>>
-      some_iter.push(iter::repeat(2).take(2));
-    let iter_of_iters = some_iter.take(2);
-      //^^^^^^^^^^^^^ impl Iterator<Item = impl Iterator<Item = i32>>
-}
-"#,
-        );
-    }
-
-    #[test]
-    fn iterator_hint_regression_issue_12674() {
-        // Ensure we don't crash while solving the projection type of iterators.
-        check_expect(
-            InlayHintsConfig { chaining_hints: true, ..DISABLED_CONFIG },
-            r#"
-//- minicore: iterators
-struct S<T>(T);
-impl<T> S<T> {
-    fn iter(&self) -> Iter<'_, T> { loop {} }
-}
-struct Iter<'a, T: 'a>(&'a T);
-impl<'a, T> Iterator for Iter<'a, T> {
-    type Item = &'a T;
-    fn next(&mut self) -> Option<Self::Item> { loop {} }
-}
-struct Container<'a> {
-    elements: S<&'a str>,
-}
-struct SliceIter<'a, T>(&'a T);
-impl<'a, T> Iterator for SliceIter<'a, T> {
-    type Item = &'a T;
-    fn next(&mut self) -> Option<Self::Item> { loop {} }
-}
-
-fn main(a: SliceIter<'_, Container>) {
-    a
-    .filter_map(|c| Some(c.elements.iter().filter_map(|v| Some(v))))
-    .map(|e| e);
-}
-            "#,
-            expect![[r#"
-                [
-                    InlayHint {
-                        range: 484..554,
-                        kind: ChainingHint,
-                        label: [
-                            "impl Iterator<Item = impl Iterator<Item = &&str>>",
-                        ],
-                        tooltip: Some(
-                            HoverRanged(
-                                FileId(
-                                    0,
-                                ),
-                                484..554,
-                            ),
-                        ),
-                    },
-                    InlayHint {
-                        range: 484..485,
-                        kind: ChainingHint,
-                        label: [
-                            "SliceIter<Container>",
-                        ],
-                        tooltip: Some(
-                            HoverRanged(
-                                FileId(
-                                    0,
-                                ),
-                                484..485,
-                            ),
-                        ),
-                    },
-                ]
-            "#]],
-        );
-    }
-
-    #[test]
-    fn infer_call_method_return_associated_types_with_generic() {
-        check_types(
-            r#"
-            pub trait Default {
-                fn default() -> Self;
-            }
-            pub trait Foo {
-                type Bar: Default;
-            }
-
-            pub fn quux<T: Foo>() -> T::Bar {
-                let y = Default::default();
-                  //^ <T as Foo>::Bar
-
-                y
-            }
-            "#,
-        );
-    }
-
-    #[test]
-    fn fn_hints() {
-        check_types(
-            r#"
-//- minicore: fn, sized
-fn foo() -> impl Fn() { loop {} }
-fn foo1() -> impl Fn(f64) { loop {} }
-fn foo2() -> impl Fn(f64, f64) { loop {} }
-fn foo3() -> impl Fn(f64, f64) -> u32 { loop {} }
-fn foo4() -> &'static dyn Fn(f64, f64) -> u32 { loop {} }
-fn foo5() -> &'static dyn Fn(&'static dyn Fn(f64, f64) -> u32, f64) -> u32 { loop {} }
-fn foo6() -> impl Fn(f64, f64) -> u32 + Sized { loop {} }
-fn foo7() -> *const (impl Fn(f64, f64) -> u32 + Sized) { loop {} }
-
-fn main() {
-    let foo = foo();
-     // ^^^ impl Fn()
-    let foo = foo1();
-     // ^^^ impl Fn(f64)
-    let foo = foo2();
-     // ^^^ impl Fn(f64, f64)
-    let foo = foo3();
-     // ^^^ impl Fn(f64, f64) -> u32
-    let foo = foo4();
-     // ^^^ &dyn Fn(f64, f64) -> u32
-    let foo = foo5();
-     // ^^^ &dyn Fn(&dyn Fn(f64, f64) -> u32, f64) -> u32
-    let foo = foo6();
-     // ^^^ impl Fn(f64, f64) -> u32
-    let foo = foo7();
-     // ^^^ *const impl Fn(f64, f64) -> u32
-}
-"#,
-        )
-    }
-
-    #[test]
-    fn check_hint_range_limit() {
-        let fixture = r#"
-        //- minicore: fn, sized
-        fn foo() -> impl Fn() { loop {} }
-        fn foo1() -> impl Fn(f64) { loop {} }
-        fn foo2() -> impl Fn(f64, f64) { loop {} }
-        fn foo3() -> impl Fn(f64, f64) -> u32 { loop {} }
-        fn foo4() -> &'static dyn Fn(f64, f64) -> u32 { loop {} }
-        fn foo5() -> &'static dyn Fn(&'static dyn Fn(f64, f64) -> u32, f64) -> u32 { loop {} }
-        fn foo6() -> impl Fn(f64, f64) -> u32 + Sized { loop {} }
-        fn foo7() -> *const (impl Fn(f64, f64) -> u32 + Sized) { loop {} }
-
-        fn main() {
-            let foo = foo();
-            let foo = foo1();
-            let foo = foo2();
-             // ^^^ impl Fn(f64, f64)
-            let foo = foo3();
-             // ^^^ impl Fn(f64, f64) -> u32
-            let foo = foo4();
-            let foo = foo5();
-            let foo = foo6();
-            let foo = foo7();
-        }
-        "#;
-        let (analysis, file_id) = fixture::file(fixture);
-        let expected = extract_annotations(&*analysis.file_text(file_id).unwrap());
-        let inlay_hints = analysis
-            .inlay_hints(
-                &InlayHintsConfig { type_hints: true, ..DISABLED_CONFIG },
-                file_id,
-                Some(TextRange::new(TextSize::from(500), TextSize::from(600))),
-            )
-            .unwrap();
-        let actual =
-            inlay_hints.into_iter().map(|it| (it.range, it.label.to_string())).collect::<Vec<_>>();
-        assert_eq!(expected, actual, "\nExpected:\n{:#?}\n\nActual:\n{:#?}", expected, actual);
-    }
-
-    #[test]
-    fn fn_hints_ptr_rpit_fn_parentheses() {
-        check_types(
-            r#"
-//- minicore: fn, sized
-trait Trait {}
-
-fn foo1() -> *const impl Fn() { loop {} }
-fn foo2() -> *const (impl Fn() + Sized) { loop {} }
-fn foo3() -> *const (impl Fn() + ?Sized) { loop {} }
-fn foo4() -> *const (impl Sized + Fn()) { loop {} }
-fn foo5() -> *const (impl ?Sized + Fn()) { loop {} }
-fn foo6() -> *const (impl Fn() + Trait) { loop {} }
-fn foo7() -> *const (impl Fn() + Sized + Trait) { loop {} }
-fn foo8() -> *const (impl Fn() + ?Sized + Trait) { loop {} }
-fn foo9() -> *const (impl Fn() -> u8 + ?Sized) { loop {} }
-fn foo10() -> *const (impl Fn() + Sized + ?Sized) { loop {} }
-
-fn main() {
-    let foo = foo1();
-    //  ^^^ *const impl Fn()
-    let foo = foo2();
-    //  ^^^ *const impl Fn()
-    let foo = foo3();
-    //  ^^^ *const (impl Fn() + ?Sized)
-    let foo = foo4();
-    //  ^^^ *const impl Fn()
-    let foo = foo5();
-    //  ^^^ *const (impl Fn() + ?Sized)
-    let foo = foo6();
-    //  ^^^ *const (impl Fn() + Trait)
-    let foo = foo7();
-    //  ^^^ *const (impl Fn() + Trait)
-    let foo = foo8();
-    //  ^^^ *const (impl Fn() + Trait + ?Sized)
-    let foo = foo9();
-    //  ^^^ *const (impl Fn() -> u8 + ?Sized)
-    let foo = foo10();
-    //  ^^^ *const impl Fn()
-}
-"#,
-        )
-    }
-
-    #[test]
-    fn unit_structs_have_no_type_hints() {
-        check_types(
-            r#"
-//- minicore: result
-struct SyntheticSyntax;
-
-fn main() {
-    match Ok(()) {
-        Ok(_) => (),
-        Err(SyntheticSyntax) => (),
-    }
-}"#,
-        );
-    }
-
-    #[test]
-    fn let_statement() {
-        check_types(
-            r#"
-#[derive(PartialEq)]
-enum Option<T> { None, Some(T) }
-
-#[derive(PartialEq)]
-struct Test { a: Option<u32>, b: u8 }
-
-fn main() {
-    struct InnerStruct {}
-
-    let test = 54;
-      //^^^^ i32
-    let test: i32 = 33;
-    let mut test = 33;
-          //^^^^ i32
-    let _ = 22;
-    let test = "test";
-      //^^^^ &str
-    let test = InnerStruct {};
-      //^^^^ InnerStruct
-
-    let test = unresolved();
-
-    let test = (42, 'a');
-      //^^^^ (i32, char)
-    let (a,    (b,     (c,)) = (2, (3, (9.2,));
-       //^ i32  ^ i32   ^ f64
-    let &x = &92;
-       //^ i32
-}"#,
-        );
-    }
-
-    #[test]
-    fn if_expr() {
-        check_types(
-            r#"
-//- minicore: option
-struct Test { a: Option<u32>, b: u8 }
-
-fn main() {
-    let test = Some(Test { a: Some(3), b: 1 });
-      //^^^^ Option<Test>
-    if let None = &test {};
-    if let test = &test {};
-         //^^^^ &Option<Test>
-    if let Some(test) = &test {};
-              //^^^^ &Test
-    if let Some(Test { a,             b }) = &test {};
-                     //^ &Option<u32> ^ &u8
-    if let Some(Test { a: x,             b: y }) = &test {};
-                        //^ &Option<u32>    ^ &u8
-    if let Some(Test { a: Some(x),  b: y }) = &test {};
-                             //^ &u32  ^ &u8
-    if let Some(Test { a: None,  b: y }) = &test {};
-                                  //^ &u8
-    if let Some(Test { b: y, .. }) = &test {};
-                        //^ &u8
-    if test == None {}
-}"#,
-        );
-    }
-
-    #[test]
-    fn while_expr() {
-        check_types(
-            r#"
-//- minicore: option
-struct Test { a: Option<u32>, b: u8 }
-
-fn main() {
-    let test = Some(Test { a: Some(3), b: 1 });
-      //^^^^ Option<Test>
-    while let Some(Test { a: Some(x),  b: y }) = &test {};
-                                //^ &u32  ^ &u8
-}"#,
-        );
-    }
-
-    #[test]
-    fn match_arm_list() {
-        check_types(
-            r#"
-//- minicore: option
-struct Test { a: Option<u32>, b: u8 }
-
-fn main() {
-    match Some(Test { a: Some(3), b: 1 }) {
-        None => (),
-        test => (),
-      //^^^^ Option<Test>
-        Some(Test { a: Some(x), b: y }) => (),
-                          //^ u32  ^ u8
-        _ => {}
-    }
-}"#,
-        );
-    }
-
-    #[test]
-    fn complete_for_hint() {
-        check_types(
-            r#"
-//- minicore: iterator
-pub struct Vec<T> {}
-
-impl<T> Vec<T> {
-    pub fn new() -> Self { Vec {} }
-    pub fn push(&mut self, t: T) {}
-}
-
-impl<T> IntoIterator for Vec<T> {
-    type Item = T;
-    type IntoIter = IntoIter<T>;
-}
-
-struct IntoIter<T> {}
-
-impl<T> Iterator for IntoIter<T> {
-    type Item = T;
-}
-
-fn main() {
-    let mut data = Vec::new();
-          //^^^^ Vec<&str>
-    data.push("foo");
-    for i in data {
-      //^ &str
-      let z = i;
-        //^ &str
-    }
-}
-"#,
-        );
-    }
-
-    #[test]
-    fn multi_dyn_trait_bounds() {
-        check_types(
-            r#"
-pub struct Vec<T> {}
-
-impl<T> Vec<T> {
-    pub fn new() -> Self { Vec {} }
-}
-
-pub struct Box<T> {}
-
-trait Display {}
-auto trait Sync {}
-
-fn main() {
-    // The block expression wrapping disables the constructor hint hiding logic
-    let _v = { Vec::<Box<&(dyn Display + Sync)>>::new() };
-      //^^ Vec<Box<&(dyn Display + Sync)>>
-    let _v = { Vec::<Box<*const (dyn Display + Sync)>>::new() };
-      //^^ Vec<Box<*const (dyn Display + Sync)>>
-    let _v = { Vec::<Box<dyn Display + Sync>>::new() };
-      //^^ Vec<Box<dyn Display + Sync>>
-}
-"#,
-        );
-    }
-
-    #[test]
-    fn shorten_iterator_hints() {
-        check_types(
-            r#"
-//- minicore: iterators
-use core::iter;
-
-struct MyIter;
-
-impl Iterator for MyIter {
-    type Item = ();
-    fn next(&mut self) -> Option<Self::Item> {
-        None
-    }
-}
-
-fn main() {
-    let _x = MyIter;
-      //^^ MyIter
-    let _x = iter::repeat(0);
-      //^^ impl Iterator<Item = i32>
-    fn generic<T: Clone>(t: T) {
-        let _x = iter::repeat(t);
-          //^^ impl Iterator<Item = T>
-        let _chained = iter::repeat(t).take(10);
-          //^^^^^^^^ impl Iterator<Item = T>
-    }
-}
-"#,
-        );
-    }
-
-    #[test]
-    fn skip_constructor_and_enum_type_hints() {
-        check_with_config(
-            InlayHintsConfig {
-                type_hints: true,
-                hide_named_constructor_hints: true,
-                ..DISABLED_CONFIG
-            },
-            r#"
-//- minicore: try, option
-use core::ops::ControlFlow;
-
-mod x {
-    pub mod y { pub struct Foo; }
-    pub struct Foo;
-    pub enum AnotherEnum {
-        Variant()
-    };
-}
-struct Struct;
-struct TupleStruct();
-
-impl Struct {
-    fn new() -> Self {
-        Struct
-    }
-    fn try_new() -> ControlFlow<(), Self> {
-        ControlFlow::Continue(Struct)
-    }
-}
-
-struct Generic<T>(T);
-impl Generic<i32> {
-    fn new() -> Self {
-        Generic(0)
-    }
-}
-
-enum Enum {
-    Variant(u32)
-}
-
-fn times2(value: i32) -> i32 {
-    2 * value
-}
-
-fn main() {
-    let enumb = Enum::Variant(0);
-
-    let strukt = x::Foo;
-    let strukt = x::y::Foo;
-    let strukt = Struct;
-    let strukt = Struct::new();
-
-    let tuple_struct = TupleStruct();
-
-    let generic0 = Generic::new();
-    //  ^^^^^^^^ Generic<i32>
-    let generic1 = Generic(0);
-    //  ^^^^^^^^ Generic<i32>
-    let generic2 = Generic::<i32>::new();
-    let generic3 = <Generic<i32>>::new();
-    let generic4 = Generic::<i32>(0);
-
-
-    let option = Some(0);
-    //  ^^^^^^ Option<i32>
-    let func = times2;
-    //  ^^^^ fn times2(i32) -> i32
-    let closure = |x: i32| x * 2;
-    //  ^^^^^^^ |i32| -> i32
-}
-
-fn fallible() -> ControlFlow<()> {
-    let strukt = Struct::try_new()?;
-}
-"#,
-        );
-    }
-
-    #[test]
-    fn shows_constructor_type_hints_when_enabled() {
-        check_types(
-            r#"
-//- minicore: try
-use core::ops::ControlFlow;
-
-struct Struct;
-struct TupleStruct();
-
-impl Struct {
-    fn new() -> Self {
-        Struct
-    }
-    fn try_new() -> ControlFlow<(), Self> {
-        ControlFlow::Continue(Struct)
-    }
-}
-
-struct Generic<T>(T);
-impl Generic<i32> {
-    fn new() -> Self {
-        Generic(0)
-    }
-}
-
-fn main() {
-    let strukt = Struct::new();
-     // ^^^^^^ Struct
-    let tuple_struct = TupleStruct();
-     // ^^^^^^^^^^^^ TupleStruct
-    let generic0 = Generic::new();
-     // ^^^^^^^^ Generic<i32>
-    let generic1 = Generic::<i32>::new();
-     // ^^^^^^^^ Generic<i32>
-    let generic2 = <Generic<i32>>::new();
-     // ^^^^^^^^ Generic<i32>
-}
-
-fn fallible() -> ControlFlow<()> {
-    let strukt = Struct::try_new()?;
-     // ^^^^^^ Struct
-}
-"#,
-        );
-    }
-
-    #[test]
-    fn closures() {
-        check(
-            r#"
-fn main() {
-    let mut start = 0;
-          //^^^^^ i32
-    (0..2).for_each(|increment      | { start += increment; });
-                   //^^^^^^^^^ i32
-
-    let multiply =
-      //^^^^^^^^ |i32, i32| -> i32
-      | a,     b| a * b
-      //^ i32  ^ i32
-
-    ;
-
-    let _: i32 = multiply(1,  2);
-                        //^ a ^ b
-    let multiply_ref = &multiply;
-      //^^^^^^^^^^^^ &|i32, i32| -> i32
-
-    let return_42 = || 42;
-      //^^^^^^^^^ || -> i32
-      || { 42 };
-    //^^ i32
-}"#,
-        );
-    }
-
-    #[test]
-    fn return_type_hints_for_closure_without_block() {
-        check_with_config(
-            InlayHintsConfig {
-                closure_return_type_hints: ClosureReturnTypeHints::Always,
-                ..DISABLED_CONFIG
-            },
-            r#"
-fn main() {
-    let a = || { 0 };
-          //^^ i32
-    let b = || 0;
-          //^^ i32
-}"#,
-        );
-    }
-
-    #[test]
-    fn skip_closure_type_hints() {
-        check_with_config(
-            InlayHintsConfig {
-                type_hints: true,
-                hide_closure_initialization_hints: true,
-                ..DISABLED_CONFIG
-            },
-            r#"
-//- minicore: fn
-fn main() {
-    let multiple_2 = |x: i32| { x * 2 };
-
-    let multiple_2 = |x: i32| x * 2;
-    //  ^^^^^^^^^^ |i32| -> i32
-
-    let (not) = (|x: bool| { !x });
-    //   ^^^ |bool| -> bool
-
-    let (is_zero, _b) = (|x: usize| { x == 0 }, false);
-    //   ^^^^^^^ |usize| -> bool
-    //            ^^ bool
-
-    let plus_one = |x| { x + 1 };
-    //              ^ u8
-    foo(plus_one);
-
-    let add_mul = bar(|x: u8| { x + 1 });
-    //  ^^^^^^^ impl FnOnce(u8) -> u8 + ?Sized
-
-    let closure = if let Some(6) = add_mul(2).checked_sub(1) {
-    //  ^^^^^^^ fn(i32) -> i32
-        |x: i32| { x * 2 }
-    } else {
-        |x: i32| { x * 3 }
-    };
-}
-
-fn foo(f: impl FnOnce(u8) -> u8) {}
-
-fn bar(f: impl FnOnce(u8) -> u8) -> impl FnOnce(u8) -> u8 {
-    move |x: u8| f(x) * 2
-}
-"#,
-        );
-    }
-
-    #[test]
-    fn hint_truncation() {
-        check_with_config(
-            InlayHintsConfig { max_length: Some(8), ..TEST_CONFIG },
-            r#"
-struct Smol<T>(T);
-
-struct VeryLongOuterName<T>(T);
-
-fn main() {
-    let a = Smol(0u32);
-      //^ Smol<u32>
-    let b = VeryLongOuterName(0usize);
-      //^ VeryLongOuterName<…>
-    let c = Smol(Smol(0u32))
-      //^ Smol<Smol<…>>
-}"#,
-        );
-    }
-
-    // Chaining hint tests
-
-    #[test]
-    fn chaining_hints_ignore_comments() {
-        check_expect(
-            InlayHintsConfig { type_hints: false, chaining_hints: true, ..DISABLED_CONFIG },
-            r#"
-struct A(B);
-impl A { fn into_b(self) -> B { self.0 } }
-struct B(C);
-impl B { fn into_c(self) -> C { self.0 } }
-struct C;
-
-fn main() {
-    let c = A(B(C))
-        .into_b() // This is a comment
-        // This is another comment
-        .into_c();
-}
-"#,
-            expect![[r#"
-                [
-                    InlayHint {
-                        range: 147..172,
-                        kind: ChainingHint,
-                        label: [
-                            "B",
-                        ],
-                        tooltip: Some(
-                            HoverRanged(
-                                FileId(
-                                    0,
-                                ),
-                                147..172,
-                            ),
-                        ),
-                    },
-                    InlayHint {
-                        range: 147..154,
-                        kind: ChainingHint,
-                        label: [
-                            "A",
-                        ],
-                        tooltip: Some(
-                            HoverRanged(
-                                FileId(
-                                    0,
-                                ),
-                                147..154,
-                            ),
-                        ),
-                    },
-                ]
-            "#]],
-        );
-    }
-
-    #[test]
-    fn chaining_hints_without_newlines() {
-        check_chains(
-            r#"
-struct A(B);
-impl A { fn into_b(self) -> B { self.0 } }
-struct B(C);
-impl B { fn into_c(self) -> C { self.0 } }
-struct C;
-
-fn main() {
-    let c = A(B(C)).into_b().into_c();
-}"#,
-        );
-    }
-
-    #[test]
-    fn struct_access_chaining_hints() {
-        check_expect(
-            InlayHintsConfig { chaining_hints: true, ..DISABLED_CONFIG },
-            r#"
-struct A { pub b: B }
-struct B { pub c: C }
-struct C(pub bool);
-struct D;
-
-impl D {
-    fn foo(&self) -> i32 { 42 }
-}
-
-fn main() {
-    let x = A { b: B { c: C(true) } }
-        .b
-        .c
-        .0;
-    let x = D
-        .foo();
-}"#,
-            expect![[r#"
-                [
-                    InlayHint {
-                        range: 143..190,
-                        kind: ChainingHint,
-                        label: [
-                            "C",
-                        ],
-                        tooltip: Some(
-                            HoverRanged(
-                                FileId(
-                                    0,
-                                ),
-                                143..190,
-                            ),
-                        ),
-                    },
-                    InlayHint {
-                        range: 143..179,
-                        kind: ChainingHint,
-                        label: [
-                            "B",
-                        ],
-                        tooltip: Some(
-                            HoverRanged(
-                                FileId(
-                                    0,
-                                ),
-                                143..179,
-                            ),
-                        ),
-                    },
-                ]
-            "#]],
-        );
-    }
-
-    #[test]
-    fn generic_chaining_hints() {
-        check_expect(
-            InlayHintsConfig { chaining_hints: true, ..DISABLED_CONFIG },
-            r#"
-struct A<T>(T);
-struct B<T>(T);
-struct C<T>(T);
-struct X<T,R>(T, R);
-
-impl<T> A<T> {
-    fn new(t: T) -> Self { A(t) }
-    fn into_b(self) -> B<T> { B(self.0) }
-}
-impl<T> B<T> {
-    fn into_c(self) -> C<T> { C(self.0) }
-}
-fn main() {
-    let c = A::new(X(42, true))
-        .into_b()
-        .into_c();
-}
-"#,
-            expect![[r#"
-                [
-                    InlayHint {
-                        range: 246..283,
-                        kind: ChainingHint,
-                        label: [
-                            "B<X<i32, bool>>",
-                        ],
-                        tooltip: Some(
-                            HoverRanged(
-                                FileId(
-                                    0,
-                                ),
-                                246..283,
-                            ),
-                        ),
-                    },
-                    InlayHint {
-                        range: 246..265,
-                        kind: ChainingHint,
-                        label: [
-                            "A<X<i32, bool>>",
-                        ],
-                        tooltip: Some(
-                            HoverRanged(
-                                FileId(
-                                    0,
-                                ),
-                                246..265,
-                            ),
-                        ),
-                    },
-                ]
-            "#]],
-        );
-    }
-
-    #[test]
-    fn shorten_iterator_chaining_hints() {
-        check_expect(
-            InlayHintsConfig { chaining_hints: true, ..DISABLED_CONFIG },
-            r#"
-//- minicore: iterators
-use core::iter;
-
-struct MyIter;
-
-impl Iterator for MyIter {
-    type Item = ();
-    fn next(&mut self) -> Option<Self::Item> {
-        None
-    }
-}
-
-fn main() {
-    let _x = MyIter.by_ref()
-        .take(5)
-        .by_ref()
-        .take(5)
-        .by_ref();
-}
-"#,
-            expect![[r#"
-                [
-                    InlayHint {
-                        range: 174..241,
-                        kind: ChainingHint,
-                        label: [
-                            "impl Iterator<Item = ()>",
-                        ],
-                        tooltip: Some(
-                            HoverRanged(
-                                FileId(
-                                    0,
-                                ),
-                                174..241,
-                            ),
-                        ),
-                    },
-                    InlayHint {
-                        range: 174..224,
-                        kind: ChainingHint,
-                        label: [
-                            "impl Iterator<Item = ()>",
-                        ],
-                        tooltip: Some(
-                            HoverRanged(
-                                FileId(
-                                    0,
-                                ),
-                                174..224,
-                            ),
-                        ),
-                    },
-                    InlayHint {
-                        range: 174..206,
-                        kind: ChainingHint,
-                        label: [
-                            "impl Iterator<Item = ()>",
-                        ],
-                        tooltip: Some(
-                            HoverRanged(
-                                FileId(
-                                    0,
-                                ),
-                                174..206,
-                            ),
-                        ),
-                    },
-                    InlayHint {
-                        range: 174..189,
-                        kind: ChainingHint,
-                        label: [
-                            "&mut MyIter",
-                        ],
-                        tooltip: Some(
-                            HoverRanged(
-                                FileId(
-                                    0,
-                                ),
-                                174..189,
-                            ),
-                        ),
-                    },
-                ]
-            "#]],
-        );
-    }
-
-    #[test]
-    fn hints_in_attr_call() {
-        check_expect(
-            TEST_CONFIG,
-            r#"
-//- proc_macros: identity, input_replace
-struct Struct;
-impl Struct {
-    fn chain(self) -> Self {
-        self
-    }
-}
-#[proc_macros::identity]
-fn main() {
-    let strukt = Struct;
-    strukt
-        .chain()
-        .chain()
-        .chain();
-    Struct::chain(strukt);
-}
-"#,
-            expect![[r#"
-                [
-                    InlayHint {
-                        range: 124..130,
-                        kind: TypeHint,
-                        label: [
-                            "Struct",
-                        ],
-                        tooltip: Some(
-                            HoverRanged(
-                                FileId(
-                                    0,
-                                ),
-                                124..130,
-                            ),
-                        ),
-                    },
-                    InlayHint {
-                        range: 145..185,
-                        kind: ChainingHint,
-                        label: [
-                            "Struct",
-                        ],
-                        tooltip: Some(
-                            HoverRanged(
-                                FileId(
-                                    0,
-                                ),
-                                145..185,
-                            ),
-                        ),
-                    },
-                    InlayHint {
-                        range: 145..168,
-                        kind: ChainingHint,
-                        label: [
-                            "Struct",
-                        ],
-                        tooltip: Some(
-                            HoverRanged(
-                                FileId(
-                                    0,
-                                ),
-                                145..168,
-                            ),
-                        ),
-                    },
-                    InlayHint {
-                        range: 222..228,
-                        kind: ParameterHint,
-                        label: [
-                            "self",
-                        ],
-                        tooltip: Some(
-                            HoverOffset(
-                                FileId(
-                                    0,
-                                ),
-                                42,
-                            ),
-                        ),
-                    },
-                ]
-            "#]],
-        );
-    }
-
-    #[test]
-    fn hints_lifetimes() {
-        check(
-            r#"
-fn empty() {}
-
-fn no_gpl(a: &()) {}
- //^^^^^^<'0>
-          // ^'0
-fn empty_gpl<>(a: &()) {}
-      //    ^'0   ^'0
-fn partial<'b>(a: &(), b: &'b ()) {}
-//        ^'0, $  ^'0
-fn partial<'a>(a: &'a (), b: &()) {}
-//        ^'0, $             ^'0
-
-fn single_ret(a: &()) -> &() {}
-// ^^^^^^^^^^<'0>
-              // ^'0     ^'0
-fn full_mul(a: &(), b: &()) {}
-// ^^^^^^^^<'0, '1>
-            // ^'0     ^'1
-
-fn foo<'c>(a: &'c ()) -> &() {}
-                      // ^'c
-
-fn nested_in(a: &   &X< &()>) {}
-// ^^^^^^^^^<'0, '1, '2>
-              //^'0 ^'1 ^'2
-fn nested_out(a: &()) -> &   &X< &()>{}
-// ^^^^^^^^^^<'0>
-               //^'0     ^'0 ^'0 ^'0
-
-impl () {
-    fn foo(&self) {}
-    // ^^^<'0>
-        // ^'0
-    fn foo(&self) -> &() {}
-    // ^^^<'0>
-        // ^'0       ^'0
-    fn foo(&self, a: &()) -> &() {}
-    // ^^^<'0, '1>
-        // ^'0       ^'1     ^'0
-}
-"#,
-        );
-    }
-
-    #[test]
-    fn hints_lifetimes_named() {
-        check_with_config(
-            InlayHintsConfig { param_names_for_lifetime_elision_hints: true, ..TEST_CONFIG },
-            r#"
-fn nested_in<'named>(named: &        &X<      &()>) {}
-//          ^'named1, 'named2, 'named3, $
-                          //^'named1 ^'named2 ^'named3
-"#,
-        );
-    }
-
-    #[test]
-    fn hints_lifetimes_trivial_skip() {
-        check_with_config(
-            InlayHintsConfig {
-                lifetime_elision_hints: LifetimeElisionHints::SkipTrivial,
-                ..TEST_CONFIG
-            },
-            r#"
-fn no_gpl(a: &()) {}
-fn empty_gpl<>(a: &()) {}
-fn partial<'b>(a: &(), b: &'b ()) {}
-fn partial<'a>(a: &'a (), b: &()) {}
-
-fn single_ret(a: &()) -> &() {}
-// ^^^^^^^^^^<'0>
-              // ^'0     ^'0
-fn full_mul(a: &(), b: &()) {}
-
-fn foo<'c>(a: &'c ()) -> &() {}
-                      // ^'c
-
-fn nested_in(a: &   &X< &()>) {}
-fn nested_out(a: &()) -> &   &X< &()>{}
-// ^^^^^^^^^^<'0>
-               //^'0     ^'0 ^'0 ^'0
-
-impl () {
-    fn foo(&self) {}
-    fn foo(&self) -> &() {}
-    // ^^^<'0>
-        // ^'0       ^'0
-    fn foo(&self, a: &()) -> &() {}
-    // ^^^<'0, '1>
-        // ^'0       ^'1     ^'0
-}
-"#,
-        );
-    }
-
-    #[test]
-    fn hints_lifetimes_static() {
-        check_with_config(
-            InlayHintsConfig {
-                lifetime_elision_hints: LifetimeElisionHints::Always,
-                ..TEST_CONFIG
-            },
-            r#"
-trait Trait {}
-static S: &str = "";
-//        ^'static
-const C: &str = "";
-//       ^'static
-const C: &dyn Trait = panic!();
-//       ^'static
-
-impl () {
-    const C: &str = "";
-    const C: &dyn Trait = panic!();
-}
-"#,
-        );
-    }
-
-    #[test]
-    fn hints_binding_modes() {
-        check_with_config(
-            InlayHintsConfig { binding_mode_hints: true, ..DISABLED_CONFIG },
-            r#"
-fn __(
-    (x,): (u32,),
-    (x,): &(u32,),
-  //^^^^&
-   //^ ref
-    (x,): &mut (u32,)
-  //^^^^&mut
-   //^ ref mut
-) {
-    let (x,) = (0,);
-    let (x,) = &(0,);
-      //^^^^ &
-       //^ ref
-    let (x,) = &mut (0,);
-      //^^^^ &mut
-       //^ ref mut
-    let &mut (x,) = &mut (0,);
-    let (ref mut x,) = &mut (0,);
-      //^^^^^^^^^^^^ &mut
-    let &mut (ref mut x,) = &mut (0,);
-    let (mut x,) = &mut (0,);
-      //^^^^^^^^ &mut
-    match (0,) {
-        (x,) => ()
-    }
-    match &(0,) {
-        (x,) => ()
-      //^^^^ &
-       //^ ref
-    }
-    match &mut (0,) {
-        (x,) => ()
-      //^^^^ &mut
-       //^ ref mut
-    }
-}"#,
-        );
-    }
-
-    #[test]
-    fn hints_closing_brace() {
-        check_with_config(
-            InlayHintsConfig { closing_brace_hints_min_lines: Some(2), ..DISABLED_CONFIG },
-            r#"
-fn a() {}
-
-fn f() {
-} // no hint unless `}` is the last token on the line
-
-fn g() {
-  }
-//^ fn g
-
-fn h<T>(with: T, arguments: u8, ...) {
-  }
-//^ fn h
-
-trait Tr {
-    fn f();
-    fn g() {
-    }
-  //^ fn g
-  }
-//^ trait Tr
-impl Tr for () {
-  }
-//^ impl Tr for ()
-impl dyn Tr {
-  }
-//^ impl dyn Tr
-
-static S0: () = 0;
-static S1: () = {};
-static S2: () = {
- };
-//^ static S2
-const _: () = {
- };
-//^ const _
-
-mod m {
-  }
-//^ mod m
-
-m! {}
-m!();
-m!(
- );
-//^ m!
-
-m! {
-  }
-//^ m!
-
-fn f() {
-    let v = vec![
-    ];
-  }
-//^ fn f
-"#,
-        );
-    }
-
-    #[test]
-    fn adjustment_hints() {
-        check_with_config(
-            InlayHintsConfig { adjustment_hints: AdjustmentHints::Always, ..DISABLED_CONFIG },
-            r#"
-//- minicore: coerce_unsized
-fn main() {
-    let _: u32         = loop {};
-                       //^^^^^^^<never-to-any>
-    let _: &u32        = &mut 0;
-                       //^^^^^^&
-                       //^^^^^^*
-    let _: &mut u32    = &mut 0;
-                       //^^^^^^&mut $
-                       //^^^^^^*
-    let _: *const u32  = &mut 0;
-                       //^^^^^^&raw const $
-                       //^^^^^^*
-    let _: *mut u32    = &mut 0;
-                       //^^^^^^&raw mut $
-                       //^^^^^^*
-    let _: fn()        = main;
-                       //^^^^<fn-item-to-fn-pointer>
-    let _: unsafe fn() = main;
-                       //^^^^<safe-fn-pointer-to-unsafe-fn-pointer>
-                       //^^^^<fn-item-to-fn-pointer>
-    let _: unsafe fn() = main as fn();
-                       //^^^^^^^^^^^^<safe-fn-pointer-to-unsafe-fn-pointer>
-    let _: fn()        = || {};
-                       //^^^^^<closure-to-fn-pointer>
-    let _: unsafe fn() = || {};
-                       //^^^^^<closure-to-unsafe-fn-pointer>
-    let _: *const u32  = &mut 0u32 as *mut u32;
-                       //^^^^^^^^^^^^^^^^^^^^^<mut-ptr-to-const-ptr>
-    let _: &mut [_]    = &mut [0; 0];
-                       //^^^^^^^^^^^<unsize>
-                       //^^^^^^^^^^^&mut $
-                       //^^^^^^^^^^^*
-
-    Struct.consume();
-    Struct.by_ref();
-  //^^^^^^(
-  //^^^^^^&
-  //^^^^^^)
-    Struct.by_ref_mut();
-  //^^^^^^(
-  //^^^^^^&mut $
-  //^^^^^^)
-
-    (&Struct).consume();
-   //^^^^^^^*
-    (&Struct).by_ref();
-
-    (&mut Struct).consume();
-   //^^^^^^^^^^^*
-    (&mut Struct).by_ref();
-   //^^^^^^^^^^^&
-   //^^^^^^^^^^^*
-    (&mut Struct).by_ref_mut();
-}
-
-#[derive(Copy, Clone)]
-struct Struct;
-impl Struct {
-    fn consume(self) {}
-    fn by_ref(&self) {}
-    fn by_ref_mut(&mut self) {}
-}
-"#,
-        )
-    }
 }
diff --git a/crates/ide/src/inlay_hints/adjustment.rs b/crates/ide/src/inlay_hints/adjustment.rs
new file mode 100644
index 0000000000..bdd7c05e00
--- /dev/null
+++ b/crates/ide/src/inlay_hints/adjustment.rs
@@ -0,0 +1,630 @@
+//! Implementation of "adjustment" inlay hints:
+//! ```no_run
+//! let _: u32  = /* <never-to-any> */ loop {};
+//! let _: &u32 = /* &* */ &mut 0;
+//! ```
+use hir::{Adjust, AutoBorrow, Mutability, OverloadedDeref, PointerCast, Safety, Semantics};
+use ide_db::RootDatabase;
+
+use syntax::{
+    ast::{self, make, AstNode},
+    ted,
+};
+
+use crate::{AdjustmentHints, AdjustmentHintsMode, InlayHint, InlayHintsConfig, InlayKind};
+
+pub(super) fn hints(
+    acc: &mut Vec<InlayHint>,
+    sema: &Semantics<'_, RootDatabase>,
+    config: &InlayHintsConfig,
+    expr: &ast::Expr,
+) -> Option<()> {
+    if config.adjustment_hints_hide_outside_unsafe && !sema.is_inside_unsafe(expr) {
+        return None;
+    }
+
+    if config.adjustment_hints == AdjustmentHints::Never {
+        return None;
+    }
+
+    // These inherit from the inner expression which would result in duplicate hints
+    if let ast::Expr::ParenExpr(_)
+    | ast::Expr::IfExpr(_)
+    | ast::Expr::BlockExpr(_)
+    | ast::Expr::MatchExpr(_) = expr
+    {
+        return None;
+    }
+
+    let descended = sema.descend_node_into_attributes(expr.clone()).pop();
+    let desc_expr = descended.as_ref().unwrap_or(expr);
+    let adjustments = sema.expr_adjustments(desc_expr).filter(|it| !it.is_empty())?;
+
+    let (postfix, needs_outer_parens, needs_inner_parens) =
+        mode_and_needs_parens_for_adjustment_hints(expr, config.adjustment_hints_mode);
+
+    if needs_outer_parens {
+        acc.push(InlayHint {
+            range: expr.syntax().text_range(),
+            kind: InlayKind::OpeningParenthesis,
+            label: "(".into(),
+            tooltip: None,
+        });
+    }
+
+    if postfix && needs_inner_parens {
+        acc.push(InlayHint {
+            range: expr.syntax().text_range(),
+            kind: InlayKind::OpeningParenthesis,
+            label: "(".into(),
+            tooltip: None,
+        });
+        acc.push(InlayHint {
+            range: expr.syntax().text_range(),
+            kind: InlayKind::ClosingParenthesis,
+            label: ")".into(),
+            tooltip: None,
+        });
+    }
+
+    let (mut tmp0, mut tmp1);
+    let iter: &mut dyn Iterator<Item = _> = if postfix {
+        tmp0 = adjustments.into_iter();
+        &mut tmp0
+    } else {
+        tmp1 = adjustments.into_iter().rev();
+        &mut tmp1
+    };
+
+    for adjustment in iter {
+        if adjustment.source == adjustment.target {
+            continue;
+        }
+
+        // FIXME: Add some nicer tooltips to each of these
+        let text = match adjustment.kind {
+            Adjust::NeverToAny if config.adjustment_hints == AdjustmentHints::Always => {
+                "<never-to-any>"
+            }
+            Adjust::Deref(None) => "*",
+            Adjust::Deref(Some(OverloadedDeref(Mutability::Mut))) => "*",
+            Adjust::Deref(Some(OverloadedDeref(Mutability::Shared))) => "*",
+            Adjust::Borrow(AutoBorrow::Ref(Mutability::Shared)) => "&",
+            Adjust::Borrow(AutoBorrow::Ref(Mutability::Mut)) => "&mut ",
+            Adjust::Borrow(AutoBorrow::RawPtr(Mutability::Shared)) => "&raw const ",
+            Adjust::Borrow(AutoBorrow::RawPtr(Mutability::Mut)) => "&raw mut ",
+            // some of these could be represented via `as` casts, but that's not too nice and
+            // handling everything as a prefix expr makes the `(` and `)` insertion easier
+            Adjust::Pointer(cast) if config.adjustment_hints == AdjustmentHints::Always => {
+                match cast {
+                    PointerCast::ReifyFnPointer => "<fn-item-to-fn-pointer>",
+                    PointerCast::UnsafeFnPointer => "<safe-fn-pointer-to-unsafe-fn-pointer>",
+                    PointerCast::ClosureFnPointer(Safety::Unsafe) => {
+                        "<closure-to-unsafe-fn-pointer>"
+                    }
+                    PointerCast::ClosureFnPointer(Safety::Safe) => "<closure-to-fn-pointer>",
+                    PointerCast::MutToConstPointer => "<mut-ptr-to-const-ptr>",
+                    PointerCast::ArrayToPointer => "<array-ptr-to-element-ptr>",
+                    PointerCast::Unsize => "<unsize>",
+                }
+            }
+            _ => continue,
+        };
+        acc.push(InlayHint {
+            range: expr.syntax().text_range(),
+            kind: if postfix {
+                InlayKind::AdjustmentHintPostfix
+            } else {
+                InlayKind::AdjustmentHint
+            },
+            label: if postfix { format!(".{}", text.trim_end()).into() } else { text.into() },
+            tooltip: None,
+        });
+    }
+    if !postfix && needs_inner_parens {
+        acc.push(InlayHint {
+            range: expr.syntax().text_range(),
+            kind: InlayKind::OpeningParenthesis,
+            label: "(".into(),
+            tooltip: None,
+        });
+        acc.push(InlayHint {
+            range: expr.syntax().text_range(),
+            kind: InlayKind::ClosingParenthesis,
+            label: ")".into(),
+            tooltip: None,
+        });
+    }
+    if needs_outer_parens {
+        acc.push(InlayHint {
+            range: expr.syntax().text_range(),
+            kind: InlayKind::ClosingParenthesis,
+            label: ")".into(),
+            tooltip: None,
+        });
+    }
+    Some(())
+}
+
+/// Returns whatever the hint should be postfix and if we need to add paretheses on the inside and/or outside of `expr`,
+/// if we are going to add (`postfix`) adjustments hints to it.
+fn mode_and_needs_parens_for_adjustment_hints(
+    expr: &ast::Expr,
+    mode: AdjustmentHintsMode,
+) -> (bool, bool, bool) {
+    use {std::cmp::Ordering::*, AdjustmentHintsMode::*};
+
+    match mode {
+        Prefix | Postfix => {
+            let postfix = matches!(mode, Postfix);
+            let (inside, outside) = needs_parens_for_adjustment_hints(expr, postfix);
+            (postfix, inside, outside)
+        }
+        PreferPrefix | PreferPostfix => {
+            let prefer_postfix = matches!(mode, PreferPostfix);
+
+            let (pre_inside, pre_outside) = needs_parens_for_adjustment_hints(expr, false);
+            let prefix = (false, pre_inside, pre_outside);
+            let pre_count = pre_inside as u8 + pre_outside as u8;
+
+            let (post_inside, post_outside) = needs_parens_for_adjustment_hints(expr, true);
+            let postfix = (true, post_inside, post_outside);
+            let post_count = post_inside as u8 + post_outside as u8;
+
+            match pre_count.cmp(&post_count) {
+                Less => prefix,
+                Greater => postfix,
+                Equal if prefer_postfix => postfix,
+                Equal => prefix,
+            }
+        }
+    }
+}
+
+/// Returns whatever we need to add paretheses on the inside and/or outside of `expr`,
+/// if we are going to add (`postfix`) adjustments hints to it.
+fn needs_parens_for_adjustment_hints(expr: &ast::Expr, postfix: bool) -> (bool, bool) {
+    // This is a very miserable pile of hacks...
+    //
+    // `Expr::needs_parens_in` requires that the expression is the child of the other expression,
+    // that is supposed to be its parent.
+    //
+    // But we want to check what would happen if we add `*`/`.*` to the inner expression.
+    // To check for inner we need `` expr.needs_parens_in(`*expr`) ``,
+    // to check for outer we need `` `*expr`.needs_parens_in(parent) ``,
+    // where "expr" is the `expr` parameter, `*expr` is the editted `expr`,
+    // and "parent" is the parent of the original expression...
+    //
+    // For this we utilize mutable mutable trees, which is a HACK, but it works.
+    //
+    // FIXME: comeup with a better API for `needs_parens_in`, so that we don't have to do *this*
+
+    // Make `&expr`/`expr?`
+    let dummy_expr = {
+        // `make::*` function go through a string, so they parse wrongly.
+        // for example `` make::expr_try(`|| a`) `` would result in a
+        // `|| (a?)` and not `(|| a)?`.
+        //
+        // Thus we need dummy parens to preserve the relationship we want.
+        // The parens are then simply ignored by the following code.
+        let dummy_paren = make::expr_paren(expr.clone());
+        if postfix {
+            make::expr_try(dummy_paren)
+        } else {
+            make::expr_ref(dummy_paren, false)
+        }
+    };
+
+    // Do the dark mutable tree magic.
+    // This essentially makes `dummy_expr` and `expr` switch places (families),
+    // so that `expr`'s parent is not `dummy_expr`'s parent.
+    let dummy_expr = dummy_expr.clone_for_update();
+    let expr = expr.clone_for_update();
+    ted::replace(expr.syntax(), dummy_expr.syntax());
+
+    let parent = dummy_expr.syntax().parent();
+    let expr = if postfix {
+        let ast::Expr::TryExpr(e) = &dummy_expr else { unreachable!() };
+        let Some(ast::Expr::ParenExpr(e)) = e.expr() else { unreachable!() };
+
+        e.expr().unwrap()
+    } else {
+        let ast::Expr::RefExpr(e) = &dummy_expr else { unreachable!() };
+        let Some(ast::Expr::ParenExpr(e)) = e.expr() else { unreachable!() };
+
+        e.expr().unwrap()
+    };
+
+    // At this point
+    // - `parent`     is the parrent of the original expression
+    // - `dummy_expr` is the original expression wrapped in the operator we want (`*`/`.*`)
+    // - `expr`       is the clone of the original expression (with `dummy_expr` as the parent)
+
+    let needs_outer_parens = parent.map_or(false, |p| dummy_expr.needs_parens_in(p));
+    let needs_inner_parens = expr.needs_parens_in(dummy_expr.syntax().clone());
+
+    (needs_outer_parens, needs_inner_parens)
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::{
+        inlay_hints::tests::{check_with_config, DISABLED_CONFIG},
+        AdjustmentHints, AdjustmentHintsMode, InlayHintsConfig,
+    };
+
+    #[test]
+    fn adjustment_hints() {
+        check_with_config(
+            InlayHintsConfig { adjustment_hints: AdjustmentHints::Always, ..DISABLED_CONFIG },
+            r#"
+//- minicore: coerce_unsized, fn
+fn main() {
+    let _: u32         = loop {};
+                       //^^^^^^^<never-to-any>
+    let _: &u32        = &mut 0;
+                       //^^^^^^&
+                       //^^^^^^*
+    let _: &mut u32    = &mut 0;
+                       //^^^^^^&mut $
+                       //^^^^^^*
+    let _: *const u32  = &mut 0;
+                       //^^^^^^&raw const $
+                       //^^^^^^*
+    let _: *mut u32    = &mut 0;
+                       //^^^^^^&raw mut $
+                       //^^^^^^*
+    let _: fn()        = main;
+                       //^^^^<fn-item-to-fn-pointer>
+    let _: unsafe fn() = main;
+                       //^^^^<safe-fn-pointer-to-unsafe-fn-pointer>
+                       //^^^^<fn-item-to-fn-pointer>
+    let _: unsafe fn() = main as fn();
+                       //^^^^^^^^^^^^<safe-fn-pointer-to-unsafe-fn-pointer>
+                       //^^^^^^^^^^^^(
+                       //^^^^^^^^^^^^)
+    let _: fn()        = || {};
+                       //^^^^^<closure-to-fn-pointer>
+    let _: unsafe fn() = || {};
+                       //^^^^^<closure-to-unsafe-fn-pointer>
+    let _: *const u32  = &mut 0u32 as *mut u32;
+                       //^^^^^^^^^^^^^^^^^^^^^<mut-ptr-to-const-ptr>
+                       //^^^^^^^^^^^^^^^^^^^^^(
+                       //^^^^^^^^^^^^^^^^^^^^^)
+    let _: &mut [_]    = &mut [0; 0];
+                       //^^^^^^^^^^^<unsize>
+                       //^^^^^^^^^^^&mut $
+                       //^^^^^^^^^^^*
+
+    Struct.consume();
+    Struct.by_ref();
+  //^^^^^^(
+  //^^^^^^&
+  //^^^^^^)
+    Struct.by_ref_mut();
+  //^^^^^^(
+  //^^^^^^&mut $
+  //^^^^^^)
+
+    (&Struct).consume();
+   //^^^^^^^*
+    (&Struct).by_ref();
+
+    (&mut Struct).consume();
+   //^^^^^^^^^^^*
+    (&mut Struct).by_ref();
+   //^^^^^^^^^^^&
+   //^^^^^^^^^^^*
+    (&mut Struct).by_ref_mut();
+
+    // Check that block-like expressions don't duplicate hints
+    let _: &mut [u32] = (&mut []);
+                       //^^^^^^^<unsize>
+                       //^^^^^^^&mut $
+                       //^^^^^^^*
+    let _: &mut [u32] = { &mut [] };
+                        //^^^^^^^<unsize>
+                        //^^^^^^^&mut $
+                        //^^^^^^^*
+    let _: &mut [u32] = unsafe { &mut [] };
+                               //^^^^^^^<unsize>
+                               //^^^^^^^&mut $
+                               //^^^^^^^*
+    let _: &mut [u32] = if true {
+        &mut []
+      //^^^^^^^<unsize>
+      //^^^^^^^&mut $
+      //^^^^^^^*
+    } else {
+        loop {}
+      //^^^^^^^<never-to-any>
+    };
+    let _: &mut [u32] = match () { () => &mut [] }
+                                       //^^^^^^^<unsize>
+                                       //^^^^^^^&mut $
+                                       //^^^^^^^*
+
+    let _: &mut dyn Fn() = &mut || ();
+                         //^^^^^^^^^^<unsize>
+                         //^^^^^^^^^^&mut $
+                         //^^^^^^^^^^*
+}
+
+#[derive(Copy, Clone)]
+struct Struct;
+impl Struct {
+    fn consume(self) {}
+    fn by_ref(&self) {}
+    fn by_ref_mut(&mut self) {}
+}
+"#,
+        )
+    }
+
+    #[test]
+    fn adjustment_hints_postfix() {
+        check_with_config(
+            InlayHintsConfig {
+                adjustment_hints: AdjustmentHints::Always,
+                adjustment_hints_mode: AdjustmentHintsMode::Postfix,
+                ..DISABLED_CONFIG
+            },
+            r#"
+//- minicore: coerce_unsized, fn
+fn main() {
+
+    Struct.consume();
+    Struct.by_ref();
+  //^^^^^^.&
+    Struct.by_ref_mut();
+  //^^^^^^.&mut
+
+    (&Struct).consume();
+   //^^^^^^^(
+   //^^^^^^^)
+   //^^^^^^^.*
+    (&Struct).by_ref();
+
+    (&mut Struct).consume();
+   //^^^^^^^^^^^(
+   //^^^^^^^^^^^)
+   //^^^^^^^^^^^.*
+    (&mut Struct).by_ref();
+   //^^^^^^^^^^^(
+   //^^^^^^^^^^^)
+   //^^^^^^^^^^^.*
+   //^^^^^^^^^^^.&
+    (&mut Struct).by_ref_mut();
+
+    // Check that block-like expressions don't duplicate hints
+    let _: &mut [u32] = (&mut []);
+                       //^^^^^^^(
+                       //^^^^^^^)
+                       //^^^^^^^.*
+                       //^^^^^^^.&mut
+                       //^^^^^^^.<unsize>
+    let _: &mut [u32] = { &mut [] };
+                        //^^^^^^^(
+                        //^^^^^^^)
+                        //^^^^^^^.*
+                        //^^^^^^^.&mut
+                        //^^^^^^^.<unsize>
+    let _: &mut [u32] = unsafe { &mut [] };
+                               //^^^^^^^(
+                               //^^^^^^^)
+                               //^^^^^^^.*
+                               //^^^^^^^.&mut
+                               //^^^^^^^.<unsize>
+    let _: &mut [u32] = if true {
+        &mut []
+      //^^^^^^^(
+      //^^^^^^^)
+      //^^^^^^^.*
+      //^^^^^^^.&mut
+      //^^^^^^^.<unsize>
+    } else {
+        loop {}
+      //^^^^^^^.<never-to-any>
+    };
+    let _: &mut [u32] = match () { () => &mut [] }
+                                       //^^^^^^^(
+                                       //^^^^^^^)
+                                       //^^^^^^^.*
+                                       //^^^^^^^.&mut
+                                       //^^^^^^^.<unsize>
+
+    let _: &mut dyn Fn() = &mut || ();
+                         //^^^^^^^^^^(
+                         //^^^^^^^^^^)
+                         //^^^^^^^^^^.*
+                         //^^^^^^^^^^.&mut
+                         //^^^^^^^^^^.<unsize>
+}
+
+#[derive(Copy, Clone)]
+struct Struct;
+impl Struct {
+    fn consume(self) {}
+    fn by_ref(&self) {}
+    fn by_ref_mut(&mut self) {}
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn adjustment_hints_prefer_prefix() {
+        check_with_config(
+            InlayHintsConfig {
+                adjustment_hints: AdjustmentHints::Always,
+                adjustment_hints_mode: AdjustmentHintsMode::PreferPrefix,
+                ..DISABLED_CONFIG
+            },
+            r#"
+fn main() {
+    let _: u32         = loop {};
+                       //^^^^^^^<never-to-any>
+
+    Struct.by_ref();
+  //^^^^^^.&
+
+    let (): () = return ();
+               //^^^^^^^^^<never-to-any>
+
+    struct Struct;
+    impl Struct { fn by_ref(&self) {} }
+}
+            "#,
+        )
+    }
+
+    #[test]
+    fn adjustment_hints_prefer_postfix() {
+        check_with_config(
+            InlayHintsConfig {
+                adjustment_hints: AdjustmentHints::Always,
+                adjustment_hints_mode: AdjustmentHintsMode::PreferPostfix,
+                ..DISABLED_CONFIG
+            },
+            r#"
+fn main() {
+    let _: u32         = loop {};
+                       //^^^^^^^.<never-to-any>
+
+    Struct.by_ref();
+  //^^^^^^.&
+
+    let (): () = return ();
+               //^^^^^^^^^<never-to-any>
+
+    struct Struct;
+    impl Struct { fn by_ref(&self) {} }
+}
+            "#,
+        )
+    }
+
+    #[test]
+    fn never_to_never_is_never_shown() {
+        check_with_config(
+            InlayHintsConfig { adjustment_hints: AdjustmentHints::Always, ..DISABLED_CONFIG },
+            r#"
+fn never() -> ! {
+    return loop {};
+}
+
+fn or_else() {
+    let () = () else { return };
+}
+            "#,
+        )
+    }
+
+    #[test]
+    fn adjustment_hints_unsafe_only() {
+        check_with_config(
+            InlayHintsConfig {
+                adjustment_hints: AdjustmentHints::Always,
+                adjustment_hints_hide_outside_unsafe: true,
+                ..DISABLED_CONFIG
+            },
+            r#"
+unsafe fn enabled() {
+    f(&&());
+    //^^^^&
+    //^^^^*
+    //^^^^*
+}
+
+fn disabled() {
+    f(&&());
+}
+
+fn mixed() {
+    f(&&());
+
+    unsafe {
+        f(&&());
+        //^^^^&
+        //^^^^*
+        //^^^^*
+    }
+}
+
+const _: () = {
+    f(&&());
+
+    unsafe {
+        f(&&());
+        //^^^^&
+        //^^^^*
+        //^^^^*
+    }
+};
+
+static STATIC: () = {
+    f(&&());
+
+    unsafe {
+        f(&&());
+        //^^^^&
+        //^^^^*
+        //^^^^*
+    }
+};
+
+enum E {
+    Disable = { f(&&()); 0 },
+    Enable = unsafe { f(&&()); 1 },
+                      //^^^^&
+                      //^^^^*
+                      //^^^^*
+}
+
+const fn f(_: &()) {}
+            "#,
+        )
+    }
+
+    #[test]
+    fn adjustment_hints_unsafe_only_with_item() {
+        check_with_config(
+            InlayHintsConfig {
+                adjustment_hints: AdjustmentHints::Always,
+                adjustment_hints_hide_outside_unsafe: true,
+                ..DISABLED_CONFIG
+            },
+            r#"
+fn a() {
+    struct Struct;
+    impl Struct {
+        fn by_ref(&self) {}
+    }
+
+    _ = Struct.by_ref();
+
+    _ = unsafe { Struct.by_ref() };
+               //^^^^^^(
+               //^^^^^^&
+               //^^^^^^)
+}
+            "#,
+        );
+    }
+
+    #[test]
+    fn bug() {
+        check_with_config(
+            InlayHintsConfig { adjustment_hints: AdjustmentHints::Always, ..DISABLED_CONFIG },
+            r#"
+fn main() {
+    // These should be identical, but they are not...
+
+    let () = return;
+    let (): () = return;
+               //^^^^^^<never-to-any>
+}
+            "#,
+        )
+    }
+}
diff --git a/crates/ide/src/inlay_hints/bind_pat.rs b/crates/ide/src/inlay_hints/bind_pat.rs
new file mode 100644
index 0000000000..adec19c765
--- /dev/null
+++ b/crates/ide/src/inlay_hints/bind_pat.rs
@@ -0,0 +1,978 @@
+//! Implementation of "type" inlay hints:
+//! ```no_run
+//! fn f(a: i32, b: i32) -> i32 { a + b }
+//! let _x /* i32 */= f(4, 4);
+//! ```
+use hir::{Semantics, TypeInfo};
+use ide_db::{base_db::FileId, famous_defs::FamousDefs, RootDatabase};
+
+use itertools::Itertools;
+use syntax::{
+    ast::{self, AstNode, HasName},
+    match_ast,
+};
+
+use crate::{
+    inlay_hints::closure_has_block_body, InlayHint, InlayHintsConfig, InlayKind, InlayTooltip,
+};
+
+use super::label_of_ty;
+
+pub(super) fn hints(
+    acc: &mut Vec<InlayHint>,
+    famous_defs @ FamousDefs(sema, _): &FamousDefs<'_, '_>,
+    config: &InlayHintsConfig,
+    file_id: FileId,
+    pat: &ast::IdentPat,
+) -> Option<()> {
+    if !config.type_hints {
+        return None;
+    }
+
+    let descended = sema.descend_node_into_attributes(pat.clone()).pop();
+    let desc_pat = descended.as_ref().unwrap_or(pat);
+    let ty = sema.type_of_pat(&desc_pat.clone().into())?.original;
+
+    if should_not_display_type_hint(sema, config, pat, &ty) {
+        return None;
+    }
+
+    let label = label_of_ty(famous_defs, config, ty)?;
+
+    if config.hide_named_constructor_hints
+        && is_named_constructor(sema, pat, &label.to_string()).is_some()
+    {
+        return None;
+    }
+
+    acc.push(InlayHint {
+        range: match pat.name() {
+            Some(name) => name.syntax().text_range(),
+            None => pat.syntax().text_range(),
+        },
+        kind: InlayKind::TypeHint,
+        label,
+        tooltip: pat
+            .name()
+            .map(|it| it.syntax().text_range())
+            .map(|it| InlayTooltip::HoverRanged(file_id, it)),
+    });
+
+    Some(())
+}
+
+fn should_not_display_type_hint(
+    sema: &Semantics<'_, RootDatabase>,
+    config: &InlayHintsConfig,
+    bind_pat: &ast::IdentPat,
+    pat_ty: &hir::Type,
+) -> bool {
+    let db = sema.db;
+
+    if pat_ty.is_unknown() {
+        return true;
+    }
+
+    if let Some(hir::Adt::Struct(s)) = pat_ty.as_adt() {
+        if s.fields(db).is_empty() && s.name(db).to_smol_str() == bind_pat.to_string() {
+            return true;
+        }
+    }
+
+    if config.hide_closure_initialization_hints {
+        if let Some(parent) = bind_pat.syntax().parent() {
+            if let Some(it) = ast::LetStmt::cast(parent) {
+                if let Some(ast::Expr::ClosureExpr(closure)) = it.initializer() {
+                    if closure_has_block_body(&closure) {
+                        return true;
+                    }
+                }
+            }
+        }
+    }
+
+    for node in bind_pat.syntax().ancestors() {
+        match_ast! {
+            match node {
+                ast::LetStmt(it) => return it.ty().is_some(),
+                // FIXME: We might wanna show type hints in parameters for non-top level patterns as well
+                ast::Param(it) => return it.ty().is_some(),
+                ast::MatchArm(_) => return pat_is_enum_variant(db, bind_pat, pat_ty),
+                ast::LetExpr(_) => return pat_is_enum_variant(db, bind_pat, pat_ty),
+                ast::IfExpr(_) => return false,
+                ast::WhileExpr(_) => return false,
+                ast::ForExpr(it) => {
+                    // We *should* display hint only if user provided "in {expr}" and we know the type of expr (and it's not unit).
+                    // Type of expr should be iterable.
+                    return it.in_token().is_none() ||
+                        it.iterable()
+                            .and_then(|iterable_expr| sema.type_of_expr(&iterable_expr))
+                            .map(TypeInfo::original)
+                            .map_or(true, |iterable_ty| iterable_ty.is_unknown() || iterable_ty.is_unit())
+                },
+                _ => (),
+            }
+        }
+    }
+    false
+}
+
+fn is_named_constructor(
+    sema: &Semantics<'_, RootDatabase>,
+    pat: &ast::IdentPat,
+    ty_name: &str,
+) -> Option<()> {
+    let let_node = pat.syntax().parent()?;
+    let expr = match_ast! {
+        match let_node {
+            ast::LetStmt(it) => it.initializer(),
+            ast::LetExpr(it) => it.expr(),
+            _ => None,
+        }
+    }?;
+
+    let expr = sema.descend_node_into_attributes(expr.clone()).pop().unwrap_or(expr);
+    // unwrap postfix expressions
+    let expr = match expr {
+        ast::Expr::TryExpr(it) => it.expr(),
+        ast::Expr::AwaitExpr(it) => it.expr(),
+        expr => Some(expr),
+    }?;
+    let expr = match expr {
+        ast::Expr::CallExpr(call) => match call.expr()? {
+            ast::Expr::PathExpr(path) => path,
+            _ => return None,
+        },
+        ast::Expr::PathExpr(path) => path,
+        _ => return None,
+    };
+    let path = expr.path()?;
+
+    let callable = sema.type_of_expr(&ast::Expr::PathExpr(expr))?.original.as_callable(sema.db);
+    let callable_kind = callable.map(|it| it.kind());
+    let qual_seg = match callable_kind {
+        Some(hir::CallableKind::Function(_) | hir::CallableKind::TupleEnumVariant(_)) => {
+            path.qualifier()?.segment()
+        }
+        _ => path.segment(),
+    }?;
+
+    let ctor_name = match qual_seg.kind()? {
+        ast::PathSegmentKind::Name(name_ref) => {
+            match qual_seg.generic_arg_list().map(|it| it.generic_args()) {
+                Some(generics) => format!("{name_ref}<{}>", generics.format(", ")),
+                None => name_ref.to_string(),
+            }
+        }
+        ast::PathSegmentKind::Type { type_ref: Some(ty), trait_ref: None } => ty.to_string(),
+        _ => return None,
+    };
+    (ctor_name == ty_name).then_some(())
+}
+
+fn pat_is_enum_variant(db: &RootDatabase, bind_pat: &ast::IdentPat, pat_ty: &hir::Type) -> bool {
+    if let Some(hir::Adt::Enum(enum_data)) = pat_ty.as_adt() {
+        let pat_text = bind_pat.to_string();
+        enum_data
+            .variants(db)
+            .into_iter()
+            .map(|variant| variant.name(db).to_smol_str())
+            .any(|enum_name| enum_name == pat_text)
+    } else {
+        false
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    // This module also contains tests for super::closure_ret
+
+    use expect_test::expect;
+    use syntax::{TextRange, TextSize};
+    use test_utils::extract_annotations;
+
+    use crate::{fixture, inlay_hints::InlayHintsConfig};
+
+    use crate::inlay_hints::tests::{
+        check, check_expect, check_with_config, DISABLED_CONFIG, DISABLED_CONFIG_WITH_LINKS,
+        TEST_CONFIG,
+    };
+    use crate::ClosureReturnTypeHints;
+
+    #[track_caller]
+    fn check_types(ra_fixture: &str) {
+        check_with_config(InlayHintsConfig { type_hints: true, ..DISABLED_CONFIG }, ra_fixture);
+    }
+
+    #[test]
+    fn type_hints_only() {
+        check_types(
+            r#"
+fn foo(a: i32, b: i32) -> i32 { a + b }
+fn main() {
+    let _x = foo(4, 4);
+      //^^ i32
+}"#,
+        );
+    }
+
+    #[test]
+    fn type_hints_bindings_after_at() {
+        check_types(
+            r#"
+//- minicore: option
+fn main() {
+    let ref foo @ bar @ ref mut baz = 0;
+          //^^^ &i32
+                //^^^ i32
+                              //^^^ &mut i32
+    let [x @ ..] = [0];
+       //^ [i32; 1]
+    if let x @ Some(_) = Some(0) {}
+         //^ Option<i32>
+    let foo @ (bar, baz) = (3, 3);
+      //^^^ (i32, i32)
+             //^^^ i32
+                  //^^^ i32
+}"#,
+        );
+    }
+
+    #[test]
+    fn default_generic_types_should_not_be_displayed() {
+        check(
+            r#"
+struct Test<K, T = u8> { k: K, t: T }
+
+fn main() {
+    let zz = Test { t: 23u8, k: 33 };
+      //^^ Test<i32>
+    let zz_ref = &zz;
+      //^^^^^^ &Test<i32>
+    let test = || zz;
+      //^^^^ || -> Test<i32>
+}"#,
+        );
+    }
+
+    #[test]
+    fn shorten_iterators_in_associated_params() {
+        check_types(
+            r#"
+//- minicore: iterators
+use core::iter;
+
+pub struct SomeIter<T> {}
+
+impl<T> SomeIter<T> {
+    pub fn new() -> Self { SomeIter {} }
+    pub fn push(&mut self, t: T) {}
+}
+
+impl<T> Iterator for SomeIter<T> {
+    type Item = T;
+    fn next(&mut self) -> Option<Self::Item> {
+        None
+    }
+}
+
+fn main() {
+    let mut some_iter = SomeIter::new();
+          //^^^^^^^^^ SomeIter<Take<Repeat<i32>>>
+      some_iter.push(iter::repeat(2).take(2));
+    let iter_of_iters = some_iter.take(2);
+      //^^^^^^^^^^^^^ impl Iterator<Item = impl Iterator<Item = i32>>
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn iterator_hint_regression_issue_12674() {
+        // Ensure we don't crash while solving the projection type of iterators.
+        check_expect(
+            InlayHintsConfig { chaining_hints: true, ..DISABLED_CONFIG_WITH_LINKS },
+            r#"
+//- minicore: iterators
+struct S<T>(T);
+impl<T> S<T> {
+    fn iter(&self) -> Iter<'_, T> { loop {} }
+}
+struct Iter<'a, T: 'a>(&'a T);
+impl<'a, T> Iterator for Iter<'a, T> {
+    type Item = &'a T;
+    fn next(&mut self) -> Option<Self::Item> { loop {} }
+}
+struct Container<'a> {
+    elements: S<&'a str>,
+}
+struct SliceIter<'a, T>(&'a T);
+impl<'a, T> Iterator for SliceIter<'a, T> {
+    type Item = &'a T;
+    fn next(&mut self) -> Option<Self::Item> { loop {} }
+}
+
+fn main(a: SliceIter<'_, Container>) {
+    a
+    .filter_map(|c| Some(c.elements.iter().filter_map(|v| Some(v))))
+    .map(|e| e);
+}
+            "#,
+            expect![[r#"
+                [
+                    InlayHint {
+                        range: 484..554,
+                        kind: ChainingHint,
+                        label: [
+                            "impl Iterator<Item = impl Iterator<Item = &&str>>",
+                        ],
+                        tooltip: Some(
+                            HoverRanged(
+                                FileId(
+                                    0,
+                                ),
+                                484..554,
+                            ),
+                        ),
+                    },
+                    InlayHint {
+                        range: 484..485,
+                        kind: ChainingHint,
+                        label: [
+                            "",
+                            InlayHintLabelPart {
+                                text: "SliceIter",
+                                linked_location: Some(
+                                    FileRange {
+                                        file_id: FileId(
+                                            0,
+                                        ),
+                                        range: 289..298,
+                                    },
+                                ),
+                            },
+                            "<",
+                            InlayHintLabelPart {
+                                text: "Container",
+                                linked_location: Some(
+                                    FileRange {
+                                        file_id: FileId(
+                                            0,
+                                        ),
+                                        range: 238..247,
+                                    },
+                                ),
+                            },
+                            ">",
+                        ],
+                        tooltip: Some(
+                            HoverRanged(
+                                FileId(
+                                    0,
+                                ),
+                                484..485,
+                            ),
+                        ),
+                    },
+                ]
+            "#]],
+        );
+    }
+
+    #[test]
+    fn infer_call_method_return_associated_types_with_generic() {
+        check_types(
+            r#"
+            pub trait Default {
+                fn default() -> Self;
+            }
+            pub trait Foo {
+                type Bar: Default;
+            }
+
+            pub fn quux<T: Foo>() -> T::Bar {
+                let y = Default::default();
+                  //^ <T as Foo>::Bar
+
+                y
+            }
+            "#,
+        );
+    }
+
+    #[test]
+    fn fn_hints() {
+        check_types(
+            r#"
+//- minicore: fn, sized
+fn foo() -> impl Fn() { loop {} }
+fn foo1() -> impl Fn(f64) { loop {} }
+fn foo2() -> impl Fn(f64, f64) { loop {} }
+fn foo3() -> impl Fn(f64, f64) -> u32 { loop {} }
+fn foo4() -> &'static dyn Fn(f64, f64) -> u32 { loop {} }
+fn foo5() -> &'static dyn Fn(&'static dyn Fn(f64, f64) -> u32, f64) -> u32 { loop {} }
+fn foo6() -> impl Fn(f64, f64) -> u32 + Sized { loop {} }
+fn foo7() -> *const (impl Fn(f64, f64) -> u32 + Sized) { loop {} }
+
+fn main() {
+    let foo = foo();
+     // ^^^ impl Fn()
+    let foo = foo1();
+     // ^^^ impl Fn(f64)
+    let foo = foo2();
+     // ^^^ impl Fn(f64, f64)
+    let foo = foo3();
+     // ^^^ impl Fn(f64, f64) -> u32
+    let foo = foo4();
+     // ^^^ &dyn Fn(f64, f64) -> u32
+    let foo = foo5();
+     // ^^^ &dyn Fn(&dyn Fn(f64, f64) -> u32, f64) -> u32
+    let foo = foo6();
+     // ^^^ impl Fn(f64, f64) -> u32
+    let foo = foo7();
+     // ^^^ *const impl Fn(f64, f64) -> u32
+}
+"#,
+        )
+    }
+
+    #[test]
+    fn check_hint_range_limit() {
+        let fixture = r#"
+        //- minicore: fn, sized
+        fn foo() -> impl Fn() { loop {} }
+        fn foo1() -> impl Fn(f64) { loop {} }
+        fn foo2() -> impl Fn(f64, f64) { loop {} }
+        fn foo3() -> impl Fn(f64, f64) -> u32 { loop {} }
+        fn foo4() -> &'static dyn Fn(f64, f64) -> u32 { loop {} }
+        fn foo5() -> &'static dyn Fn(&'static dyn Fn(f64, f64) -> u32, f64) -> u32 { loop {} }
+        fn foo6() -> impl Fn(f64, f64) -> u32 + Sized { loop {} }
+        fn foo7() -> *const (impl Fn(f64, f64) -> u32 + Sized) { loop {} }
+
+        fn main() {
+            let foo = foo();
+            let foo = foo1();
+            let foo = foo2();
+             // ^^^ impl Fn(f64, f64)
+            let foo = foo3();
+             // ^^^ impl Fn(f64, f64) -> u32
+            let foo = foo4();
+            let foo = foo5();
+            let foo = foo6();
+            let foo = foo7();
+        }
+        "#;
+        let (analysis, file_id) = fixture::file(fixture);
+        let expected = extract_annotations(&analysis.file_text(file_id).unwrap());
+        let inlay_hints = analysis
+            .inlay_hints(
+                &InlayHintsConfig { type_hints: true, ..DISABLED_CONFIG },
+                file_id,
+                Some(TextRange::new(TextSize::from(500), TextSize::from(600))),
+            )
+            .unwrap();
+        let actual =
+            inlay_hints.into_iter().map(|it| (it.range, it.label.to_string())).collect::<Vec<_>>();
+        assert_eq!(expected, actual, "\nExpected:\n{expected:#?}\n\nActual:\n{actual:#?}");
+    }
+
+    #[test]
+    fn fn_hints_ptr_rpit_fn_parentheses() {
+        check_types(
+            r#"
+//- minicore: fn, sized
+trait Trait {}
+
+fn foo1() -> *const impl Fn() { loop {} }
+fn foo2() -> *const (impl Fn() + Sized) { loop {} }
+fn foo3() -> *const (impl Fn() + ?Sized) { loop {} }
+fn foo4() -> *const (impl Sized + Fn()) { loop {} }
+fn foo5() -> *const (impl ?Sized + Fn()) { loop {} }
+fn foo6() -> *const (impl Fn() + Trait) { loop {} }
+fn foo7() -> *const (impl Fn() + Sized + Trait) { loop {} }
+fn foo8() -> *const (impl Fn() + ?Sized + Trait) { loop {} }
+fn foo9() -> *const (impl Fn() -> u8 + ?Sized) { loop {} }
+fn foo10() -> *const (impl Fn() + Sized + ?Sized) { loop {} }
+
+fn main() {
+    let foo = foo1();
+    //  ^^^ *const impl Fn()
+    let foo = foo2();
+    //  ^^^ *const impl Fn()
+    let foo = foo3();
+    //  ^^^ *const (impl Fn() + ?Sized)
+    let foo = foo4();
+    //  ^^^ *const impl Fn()
+    let foo = foo5();
+    //  ^^^ *const (impl Fn() + ?Sized)
+    let foo = foo6();
+    //  ^^^ *const (impl Fn() + Trait)
+    let foo = foo7();
+    //  ^^^ *const (impl Fn() + Trait)
+    let foo = foo8();
+    //  ^^^ *const (impl Fn() + Trait + ?Sized)
+    let foo = foo9();
+    //  ^^^ *const (impl Fn() -> u8 + ?Sized)
+    let foo = foo10();
+    //  ^^^ *const impl Fn()
+}
+"#,
+        )
+    }
+
+    #[test]
+    fn unit_structs_have_no_type_hints() {
+        check_types(
+            r#"
+//- minicore: result
+struct SyntheticSyntax;
+
+fn main() {
+    match Ok(()) {
+        Ok(_) => (),
+        Err(SyntheticSyntax) => (),
+    }
+}"#,
+        );
+    }
+
+    #[test]
+    fn let_statement() {
+        check_types(
+            r#"
+#[derive(PartialEq)]
+enum Option<T> { None, Some(T) }
+
+#[derive(PartialEq)]
+struct Test { a: Option<u32>, b: u8 }
+
+fn main() {
+    struct InnerStruct {}
+
+    let test = 54;
+      //^^^^ i32
+    let test: i32 = 33;
+    let mut test = 33;
+          //^^^^ i32
+    let _ = 22;
+    let test = "test";
+      //^^^^ &str
+    let test = InnerStruct {};
+      //^^^^ InnerStruct
+
+    let test = unresolved();
+
+    let test = (42, 'a');
+      //^^^^ (i32, char)
+    let (a,    (b,     (c,)) = (2, (3, (9.2,));
+       //^ i32  ^ i32   ^ f64
+    let &x = &92;
+       //^ i32
+}"#,
+        );
+    }
+
+    #[test]
+    fn if_expr() {
+        check_types(
+            r#"
+//- minicore: option
+struct Test { a: Option<u32>, b: u8 }
+
+fn main() {
+    let test = Some(Test { a: Some(3), b: 1 });
+      //^^^^ Option<Test>
+    if let None = &test {};
+    if let test = &test {};
+         //^^^^ &Option<Test>
+    if let Some(test) = &test {};
+              //^^^^ &Test
+    if let Some(Test { a,             b }) = &test {};
+                     //^ &Option<u32> ^ &u8
+    if let Some(Test { a: x,             b: y }) = &test {};
+                        //^ &Option<u32>    ^ &u8
+    if let Some(Test { a: Some(x),  b: y }) = &test {};
+                             //^ &u32  ^ &u8
+    if let Some(Test { a: None,  b: y }) = &test {};
+                                  //^ &u8
+    if let Some(Test { b: y, .. }) = &test {};
+                        //^ &u8
+    if test == None {}
+}"#,
+        );
+    }
+
+    #[test]
+    fn while_expr() {
+        check_types(
+            r#"
+//- minicore: option
+struct Test { a: Option<u32>, b: u8 }
+
+fn main() {
+    let test = Some(Test { a: Some(3), b: 1 });
+      //^^^^ Option<Test>
+    while let Some(Test { a: Some(x),  b: y }) = &test {};
+                                //^ &u32  ^ &u8
+}"#,
+        );
+    }
+
+    #[test]
+    fn match_arm_list() {
+        check_types(
+            r#"
+//- minicore: option
+struct Test { a: Option<u32>, b: u8 }
+
+fn main() {
+    match Some(Test { a: Some(3), b: 1 }) {
+        None => (),
+        test => (),
+      //^^^^ Option<Test>
+        Some(Test { a: Some(x), b: y }) => (),
+                          //^ u32  ^ u8
+        _ => {}
+    }
+}"#,
+        );
+    }
+
+    #[test]
+    fn complete_for_hint() {
+        check_types(
+            r#"
+//- minicore: iterator
+pub struct Vec<T> {}
+
+impl<T> Vec<T> {
+    pub fn new() -> Self { Vec {} }
+    pub fn push(&mut self, t: T) {}
+}
+
+impl<T> IntoIterator for Vec<T> {
+    type Item = T;
+    type IntoIter = IntoIter<T>;
+}
+
+struct IntoIter<T> {}
+
+impl<T> Iterator for IntoIter<T> {
+    type Item = T;
+}
+
+fn main() {
+    let mut data = Vec::new();
+          //^^^^ Vec<&str>
+    data.push("foo");
+    for i in data {
+      //^ &str
+      let z = i;
+        //^ &str
+    }
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn multi_dyn_trait_bounds() {
+        check_types(
+            r#"
+pub struct Vec<T> {}
+
+impl<T> Vec<T> {
+    pub fn new() -> Self { Vec {} }
+}
+
+pub struct Box<T> {}
+
+trait Display {}
+auto trait Sync {}
+
+fn main() {
+    // The block expression wrapping disables the constructor hint hiding logic
+    let _v = { Vec::<Box<&(dyn Display + Sync)>>::new() };
+      //^^ Vec<Box<&(dyn Display + Sync)>>
+    let _v = { Vec::<Box<*const (dyn Display + Sync)>>::new() };
+      //^^ Vec<Box<*const (dyn Display + Sync)>>
+    let _v = { Vec::<Box<dyn Display + Sync>>::new() };
+      //^^ Vec<Box<dyn Display + Sync>>
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn shorten_iterator_hints() {
+        check_types(
+            r#"
+//- minicore: iterators
+use core::iter;
+
+struct MyIter;
+
+impl Iterator for MyIter {
+    type Item = ();
+    fn next(&mut self) -> Option<Self::Item> {
+        None
+    }
+}
+
+fn main() {
+    let _x = MyIter;
+      //^^ MyIter
+    let _x = iter::repeat(0);
+      //^^ impl Iterator<Item = i32>
+    fn generic<T: Clone>(t: T) {
+        let _x = iter::repeat(t);
+          //^^ impl Iterator<Item = T>
+        let _chained = iter::repeat(t).take(10);
+          //^^^^^^^^ impl Iterator<Item = T>
+    }
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn skip_constructor_and_enum_type_hints() {
+        check_with_config(
+            InlayHintsConfig {
+                type_hints: true,
+                hide_named_constructor_hints: true,
+                ..DISABLED_CONFIG
+            },
+            r#"
+//- minicore: try, option
+use core::ops::ControlFlow;
+
+mod x {
+    pub mod y { pub struct Foo; }
+    pub struct Foo;
+    pub enum AnotherEnum {
+        Variant()
+    };
+}
+struct Struct;
+struct TupleStruct();
+
+impl Struct {
+    fn new() -> Self {
+        Struct
+    }
+    fn try_new() -> ControlFlow<(), Self> {
+        ControlFlow::Continue(Struct)
+    }
+}
+
+struct Generic<T>(T);
+impl Generic<i32> {
+    fn new() -> Self {
+        Generic(0)
+    }
+}
+
+enum Enum {
+    Variant(u32)
+}
+
+fn times2(value: i32) -> i32 {
+    2 * value
+}
+
+fn main() {
+    let enumb = Enum::Variant(0);
+
+    let strukt = x::Foo;
+    let strukt = x::y::Foo;
+    let strukt = Struct;
+    let strukt = Struct::new();
+
+    let tuple_struct = TupleStruct();
+
+    let generic0 = Generic::new();
+    //  ^^^^^^^^ Generic<i32>
+    let generic1 = Generic(0);
+    //  ^^^^^^^^ Generic<i32>
+    let generic2 = Generic::<i32>::new();
+    let generic3 = <Generic<i32>>::new();
+    let generic4 = Generic::<i32>(0);
+
+
+    let option = Some(0);
+    //  ^^^^^^ Option<i32>
+    let func = times2;
+    //  ^^^^ fn times2(i32) -> i32
+    let closure = |x: i32| x * 2;
+    //  ^^^^^^^ |i32| -> i32
+}
+
+fn fallible() -> ControlFlow<()> {
+    let strukt = Struct::try_new()?;
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn shows_constructor_type_hints_when_enabled() {
+        check_types(
+            r#"
+//- minicore: try
+use core::ops::ControlFlow;
+
+struct Struct;
+struct TupleStruct();
+
+impl Struct {
+    fn new() -> Self {
+        Struct
+    }
+    fn try_new() -> ControlFlow<(), Self> {
+        ControlFlow::Continue(Struct)
+    }
+}
+
+struct Generic<T>(T);
+impl Generic<i32> {
+    fn new() -> Self {
+        Generic(0)
+    }
+}
+
+fn main() {
+    let strukt = Struct::new();
+     // ^^^^^^ Struct
+    let tuple_struct = TupleStruct();
+     // ^^^^^^^^^^^^ TupleStruct
+    let generic0 = Generic::new();
+     // ^^^^^^^^ Generic<i32>
+    let generic1 = Generic::<i32>::new();
+     // ^^^^^^^^ Generic<i32>
+    let generic2 = <Generic<i32>>::new();
+     // ^^^^^^^^ Generic<i32>
+}
+
+fn fallible() -> ControlFlow<()> {
+    let strukt = Struct::try_new()?;
+     // ^^^^^^ Struct
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn closures() {
+        check(
+            r#"
+fn main() {
+    let mut start = 0;
+          //^^^^^ i32
+    (0..2).for_each(|increment      | { start += increment; });
+                   //^^^^^^^^^ i32
+
+    let multiply =
+      //^^^^^^^^ |i32, i32| -> i32
+      | a,     b| a * b
+      //^ i32  ^ i32
+
+    ;
+
+    let _: i32 = multiply(1,  2);
+                        //^ a ^ b
+    let multiply_ref = &multiply;
+      //^^^^^^^^^^^^ &|i32, i32| -> i32
+
+    let return_42 = || 42;
+      //^^^^^^^^^ || -> i32
+      || { 42 };
+    //^^ i32
+}"#,
+        );
+    }
+
+    #[test]
+    fn return_type_hints_for_closure_without_block() {
+        check_with_config(
+            InlayHintsConfig {
+                closure_return_type_hints: ClosureReturnTypeHints::Always,
+                ..DISABLED_CONFIG
+            },
+            r#"
+fn main() {
+    let a = || { 0 };
+          //^^ i32
+    let b = || 0;
+          //^^ i32
+}"#,
+        );
+    }
+
+    #[test]
+    fn skip_closure_type_hints() {
+        check_with_config(
+            InlayHintsConfig {
+                type_hints: true,
+                hide_closure_initialization_hints: true,
+                ..DISABLED_CONFIG
+            },
+            r#"
+//- minicore: fn
+fn main() {
+    let multiple_2 = |x: i32| { x * 2 };
+
+    let multiple_2 = |x: i32| x * 2;
+    //  ^^^^^^^^^^ |i32| -> i32
+
+    let (not) = (|x: bool| { !x });
+    //   ^^^ |bool| -> bool
+
+    let (is_zero, _b) = (|x: usize| { x == 0 }, false);
+    //   ^^^^^^^ |usize| -> bool
+    //            ^^ bool
+
+    let plus_one = |x| { x + 1 };
+    //              ^ u8
+    foo(plus_one);
+
+    let add_mul = bar(|x: u8| { x + 1 });
+    //  ^^^^^^^ impl FnOnce(u8) -> u8 + ?Sized
+
+    let closure = if let Some(6) = add_mul(2).checked_sub(1) {
+    //  ^^^^^^^ fn(i32) -> i32
+        |x: i32| { x * 2 }
+    } else {
+        |x: i32| { x * 3 }
+    };
+}
+
+fn foo(f: impl FnOnce(u8) -> u8) {}
+
+fn bar(f: impl FnOnce(u8) -> u8) -> impl FnOnce(u8) -> u8 {
+    move |x: u8| f(x) * 2
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn hint_truncation() {
+        check_with_config(
+            InlayHintsConfig { max_length: Some(8), ..TEST_CONFIG },
+            r#"
+struct Smol<T>(T);
+
+struct VeryLongOuterName<T>(T);
+
+fn main() {
+    let a = Smol(0u32);
+      //^ Smol<u32>
+    let b = VeryLongOuterName(0usize);
+      //^ VeryLongOuterName<…>
+    let c = Smol(Smol(0u32))
+      //^ Smol<Smol<…>>
+}"#,
+        );
+    }
+}
diff --git a/crates/ide/src/inlay_hints/binding_mode.rs b/crates/ide/src/inlay_hints/binding_mode.rs
new file mode 100644
index 0000000000..a0166d0048
--- /dev/null
+++ b/crates/ide/src/inlay_hints/binding_mode.rs
@@ -0,0 +1,142 @@
+//! Implementation of "binding mode" inlay hints:
+//! ```no_run
+//! let /* & */ (/* ref */ x,) = &(0,);
+//! ```
+use hir::{Mutability, Semantics};
+use ide_db::RootDatabase;
+
+use syntax::ast::{self, AstNode};
+
+use crate::{InlayHint, InlayHintsConfig, InlayKind, InlayTooltip};
+
+pub(super) fn hints(
+    acc: &mut Vec<InlayHint>,
+    sema: &Semantics<'_, RootDatabase>,
+    config: &InlayHintsConfig,
+    pat: &ast::Pat,
+) -> Option<()> {
+    if !config.binding_mode_hints {
+        return None;
+    }
+
+    let outer_paren_pat = pat
+        .syntax()
+        .ancestors()
+        .skip(1)
+        .map_while(ast::Pat::cast)
+        .map_while(|pat| match pat {
+            ast::Pat::ParenPat(pat) => Some(pat),
+            _ => None,
+        })
+        .last();
+    let range =
+        outer_paren_pat.as_ref().map_or_else(|| pat.syntax(), |it| it.syntax()).text_range();
+    let pattern_adjustments = sema.pattern_adjustments(pat);
+    pattern_adjustments.iter().for_each(|ty| {
+        let reference = ty.is_reference();
+        let mut_reference = ty.is_mutable_reference();
+        let r = match (reference, mut_reference) {
+            (true, true) => "&mut",
+            (true, false) => "&",
+            _ => return,
+        };
+        acc.push(InlayHint {
+            range,
+            kind: InlayKind::BindingModeHint,
+            label: r.to_string().into(),
+            tooltip: Some(InlayTooltip::String("Inferred binding mode".into())),
+        });
+    });
+    match pat {
+        ast::Pat::IdentPat(pat) if pat.ref_token().is_none() && pat.mut_token().is_none() => {
+            let bm = sema.binding_mode_of_pat(pat)?;
+            let bm = match bm {
+                hir::BindingMode::Move => return None,
+                hir::BindingMode::Ref(Mutability::Mut) => "ref mut",
+                hir::BindingMode::Ref(Mutability::Shared) => "ref",
+            };
+            acc.push(InlayHint {
+                range: pat.syntax().text_range(),
+                kind: InlayKind::BindingModeHint,
+                label: bm.to_string().into(),
+                tooltip: Some(InlayTooltip::String("Inferred binding mode".into())),
+            });
+        }
+        ast::Pat::OrPat(pat) if !pattern_adjustments.is_empty() && outer_paren_pat.is_none() => {
+            acc.push(InlayHint {
+                range: pat.syntax().text_range(),
+                kind: InlayKind::OpeningParenthesis,
+                label: "(".into(),
+                tooltip: None,
+            });
+            acc.push(InlayHint {
+                range: pat.syntax().text_range(),
+                kind: InlayKind::ClosingParenthesis,
+                label: ")".into(),
+                tooltip: None,
+            });
+        }
+        _ => (),
+    }
+
+    Some(())
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::{
+        inlay_hints::tests::{check_with_config, DISABLED_CONFIG},
+        InlayHintsConfig,
+    };
+
+    #[test]
+    fn hints_binding_modes() {
+        check_with_config(
+            InlayHintsConfig { binding_mode_hints: true, ..DISABLED_CONFIG },
+            r#"
+fn __(
+    (x,): (u32,),
+    (x,): &(u32,),
+  //^^^^&
+   //^ ref
+    (x,): &mut (u32,)
+  //^^^^&mut
+   //^ ref mut
+) {
+    let (x,) = (0,);
+    let (x,) = &(0,);
+      //^^^^ &
+       //^ ref
+    let (x,) = &mut (0,);
+      //^^^^ &mut
+       //^ ref mut
+    let &mut (x,) = &mut (0,);
+    let (ref mut x,) = &mut (0,);
+      //^^^^^^^^^^^^ &mut
+    let &mut (ref mut x,) = &mut (0,);
+    let (mut x,) = &mut (0,);
+      //^^^^^^^^ &mut
+    match (0,) {
+        (x,) => ()
+    }
+    match &(0,) {
+        (x,) | (x,) => (),
+      //^^^^^^^^^^^&
+       //^ ref
+              //^ ref
+      //^^^^^^^^^^^(
+      //^^^^^^^^^^^)
+        ((x,) | (x,)) => (),
+      //^^^^^^^^^^^^^&
+        //^ ref
+               //^ ref
+    }
+    match &mut (0,) {
+        (x,) => ()
+      //^^^^ &mut
+       //^ ref mut
+    }
+}"#,
+        );
+    }
+}
diff --git a/crates/ide/src/inlay_hints/chaining.rs b/crates/ide/src/inlay_hints/chaining.rs
new file mode 100644
index 0000000000..8810d5d34d
--- /dev/null
+++ b/crates/ide/src/inlay_hints/chaining.rs
@@ -0,0 +1,665 @@
+//! Implementation of "chaining" inlay hints.
+use ide_db::famous_defs::FamousDefs;
+use syntax::{
+    ast::{self, AstNode},
+    Direction, NodeOrToken, SyntaxKind, T,
+};
+
+use crate::{FileId, InlayHint, InlayHintsConfig, InlayKind, InlayTooltip};
+
+use super::label_of_ty;
+
+pub(super) fn hints(
+    acc: &mut Vec<InlayHint>,
+    famous_defs @ FamousDefs(sema, _): &FamousDefs<'_, '_>,
+    config: &InlayHintsConfig,
+    file_id: FileId,
+    expr: &ast::Expr,
+) -> Option<()> {
+    if !config.chaining_hints {
+        return None;
+    }
+
+    if matches!(expr, ast::Expr::RecordExpr(_)) {
+        return None;
+    }
+
+    let descended = sema.descend_node_into_attributes(expr.clone()).pop();
+    let desc_expr = descended.as_ref().unwrap_or(expr);
+
+    let mut tokens = expr
+        .syntax()
+        .siblings_with_tokens(Direction::Next)
+        .filter_map(NodeOrToken::into_token)
+        .filter(|t| match t.kind() {
+            SyntaxKind::WHITESPACE if !t.text().contains('\n') => false,
+            SyntaxKind::COMMENT => false,
+            _ => true,
+        });
+
+    // Chaining can be defined as an expression whose next sibling tokens are newline and dot
+    // Ignoring extra whitespace and comments
+    let next = tokens.next()?.kind();
+    if next == SyntaxKind::WHITESPACE {
+        let mut next_next = tokens.next()?.kind();
+        while next_next == SyntaxKind::WHITESPACE {
+            next_next = tokens.next()?.kind();
+        }
+        if next_next == T![.] {
+            let ty = sema.type_of_expr(desc_expr)?.original;
+            if ty.is_unknown() {
+                return None;
+            }
+            if matches!(expr, ast::Expr::PathExpr(_)) {
+                if let Some(hir::Adt::Struct(st)) = ty.as_adt() {
+                    if st.fields(sema.db).is_empty() {
+                        return None;
+                    }
+                }
+            }
+            acc.push(InlayHint {
+                range: expr.syntax().text_range(),
+                kind: InlayKind::ChainingHint,
+                label: label_of_ty(famous_defs, config, ty)?,
+                tooltip: Some(InlayTooltip::HoverRanged(file_id, expr.syntax().text_range())),
+            });
+        }
+    }
+    Some(())
+}
+
+#[cfg(test)]
+mod tests {
+    use expect_test::expect;
+
+    use crate::{
+        inlay_hints::tests::{
+            check_expect, check_with_config, DISABLED_CONFIG, DISABLED_CONFIG_WITH_LINKS,
+            TEST_CONFIG,
+        },
+        InlayHintsConfig,
+    };
+
+    #[track_caller]
+    fn check_chains(ra_fixture: &str) {
+        check_with_config(InlayHintsConfig { chaining_hints: true, ..DISABLED_CONFIG }, ra_fixture);
+    }
+
+    #[test]
+    fn chaining_hints_ignore_comments() {
+        check_expect(
+            InlayHintsConfig {
+                type_hints: false,
+                chaining_hints: true,
+                ..DISABLED_CONFIG_WITH_LINKS
+            },
+            r#"
+struct A(B);
+impl A { fn into_b(self) -> B { self.0 } }
+struct B(C);
+impl B { fn into_c(self) -> C { self.0 } }
+struct C;
+
+fn main() {
+    let c = A(B(C))
+        .into_b() // This is a comment
+        // This is another comment
+        .into_c();
+}
+"#,
+            expect![[r#"
+                [
+                    InlayHint {
+                        range: 147..172,
+                        kind: ChainingHint,
+                        label: [
+                            "",
+                            InlayHintLabelPart {
+                                text: "B",
+                                linked_location: Some(
+                                    FileRange {
+                                        file_id: FileId(
+                                            0,
+                                        ),
+                                        range: 63..64,
+                                    },
+                                ),
+                            },
+                            "",
+                        ],
+                        tooltip: Some(
+                            HoverRanged(
+                                FileId(
+                                    0,
+                                ),
+                                147..172,
+                            ),
+                        ),
+                    },
+                    InlayHint {
+                        range: 147..154,
+                        kind: ChainingHint,
+                        label: [
+                            "",
+                            InlayHintLabelPart {
+                                text: "A",
+                                linked_location: Some(
+                                    FileRange {
+                                        file_id: FileId(
+                                            0,
+                                        ),
+                                        range: 7..8,
+                                    },
+                                ),
+                            },
+                            "",
+                        ],
+                        tooltip: Some(
+                            HoverRanged(
+                                FileId(
+                                    0,
+                                ),
+                                147..154,
+                            ),
+                        ),
+                    },
+                ]
+            "#]],
+        );
+    }
+
+    #[test]
+    fn chaining_hints_without_newlines() {
+        check_chains(
+            r#"
+struct A(B);
+impl A { fn into_b(self) -> B { self.0 } }
+struct B(C);
+impl B { fn into_c(self) -> C { self.0 } }
+struct C;
+
+fn main() {
+    let c = A(B(C)).into_b().into_c();
+}"#,
+        );
+    }
+
+    #[test]
+    fn disabled_location_links() {
+        check_expect(
+            InlayHintsConfig { chaining_hints: true, ..DISABLED_CONFIG },
+            r#"
+    struct A { pub b: B }
+    struct B { pub c: C }
+    struct C(pub bool);
+    struct D;
+
+    impl D {
+        fn foo(&self) -> i32 { 42 }
+    }
+
+    fn main() {
+        let x = A { b: B { c: C(true) } }
+            .b
+            .c
+            .0;
+        let x = D
+            .foo();
+    }"#,
+            expect![[r#"
+                [
+                    InlayHint {
+                        range: 143..190,
+                        kind: ChainingHint,
+                        label: [
+                            "C",
+                        ],
+                        tooltip: Some(
+                            HoverRanged(
+                                FileId(
+                                    0,
+                                ),
+                                143..190,
+                            ),
+                        ),
+                    },
+                    InlayHint {
+                        range: 143..179,
+                        kind: ChainingHint,
+                        label: [
+                            "B",
+                        ],
+                        tooltip: Some(
+                            HoverRanged(
+                                FileId(
+                                    0,
+                                ),
+                                143..179,
+                            ),
+                        ),
+                    },
+                ]
+            "#]],
+        );
+    }
+
+    #[test]
+    fn struct_access_chaining_hints() {
+        check_expect(
+            InlayHintsConfig { chaining_hints: true, ..DISABLED_CONFIG_WITH_LINKS },
+            r#"
+struct A { pub b: B }
+struct B { pub c: C }
+struct C(pub bool);
+struct D;
+
+impl D {
+    fn foo(&self) -> i32 { 42 }
+}
+
+fn main() {
+    let x = A { b: B { c: C(true) } }
+        .b
+        .c
+        .0;
+    let x = D
+        .foo();
+}"#,
+            expect![[r#"
+                [
+                    InlayHint {
+                        range: 143..190,
+                        kind: ChainingHint,
+                        label: [
+                            "",
+                            InlayHintLabelPart {
+                                text: "C",
+                                linked_location: Some(
+                                    FileRange {
+                                        file_id: FileId(
+                                            0,
+                                        ),
+                                        range: 51..52,
+                                    },
+                                ),
+                            },
+                            "",
+                        ],
+                        tooltip: Some(
+                            HoverRanged(
+                                FileId(
+                                    0,
+                                ),
+                                143..190,
+                            ),
+                        ),
+                    },
+                    InlayHint {
+                        range: 143..179,
+                        kind: ChainingHint,
+                        label: [
+                            "",
+                            InlayHintLabelPart {
+                                text: "B",
+                                linked_location: Some(
+                                    FileRange {
+                                        file_id: FileId(
+                                            0,
+                                        ),
+                                        range: 29..30,
+                                    },
+                                ),
+                            },
+                            "",
+                        ],
+                        tooltip: Some(
+                            HoverRanged(
+                                FileId(
+                                    0,
+                                ),
+                                143..179,
+                            ),
+                        ),
+                    },
+                ]
+            "#]],
+        );
+    }
+
+    #[test]
+    fn generic_chaining_hints() {
+        check_expect(
+            InlayHintsConfig { chaining_hints: true, ..DISABLED_CONFIG_WITH_LINKS },
+            r#"
+struct A<T>(T);
+struct B<T>(T);
+struct C<T>(T);
+struct X<T,R>(T, R);
+
+impl<T> A<T> {
+    fn new(t: T) -> Self { A(t) }
+    fn into_b(self) -> B<T> { B(self.0) }
+}
+impl<T> B<T> {
+    fn into_c(self) -> C<T> { C(self.0) }
+}
+fn main() {
+    let c = A::new(X(42, true))
+        .into_b()
+        .into_c();
+}
+"#,
+            expect![[r#"
+                [
+                    InlayHint {
+                        range: 246..283,
+                        kind: ChainingHint,
+                        label: [
+                            "",
+                            InlayHintLabelPart {
+                                text: "B",
+                                linked_location: Some(
+                                    FileRange {
+                                        file_id: FileId(
+                                            0,
+                                        ),
+                                        range: 23..24,
+                                    },
+                                ),
+                            },
+                            "<",
+                            InlayHintLabelPart {
+                                text: "X",
+                                linked_location: Some(
+                                    FileRange {
+                                        file_id: FileId(
+                                            0,
+                                        ),
+                                        range: 55..56,
+                                    },
+                                ),
+                            },
+                            "<i32, bool>>",
+                        ],
+                        tooltip: Some(
+                            HoverRanged(
+                                FileId(
+                                    0,
+                                ),
+                                246..283,
+                            ),
+                        ),
+                    },
+                    InlayHint {
+                        range: 246..265,
+                        kind: ChainingHint,
+                        label: [
+                            "",
+                            InlayHintLabelPart {
+                                text: "A",
+                                linked_location: Some(
+                                    FileRange {
+                                        file_id: FileId(
+                                            0,
+                                        ),
+                                        range: 7..8,
+                                    },
+                                ),
+                            },
+                            "<",
+                            InlayHintLabelPart {
+                                text: "X",
+                                linked_location: Some(
+                                    FileRange {
+                                        file_id: FileId(
+                                            0,
+                                        ),
+                                        range: 55..56,
+                                    },
+                                ),
+                            },
+                            "<i32, bool>>",
+                        ],
+                        tooltip: Some(
+                            HoverRanged(
+                                FileId(
+                                    0,
+                                ),
+                                246..265,
+                            ),
+                        ),
+                    },
+                ]
+            "#]],
+        );
+    }
+
+    #[test]
+    fn shorten_iterator_chaining_hints() {
+        check_expect(
+            InlayHintsConfig { chaining_hints: true, ..DISABLED_CONFIG_WITH_LINKS },
+            r#"
+//- minicore: iterators
+use core::iter;
+
+struct MyIter;
+
+impl Iterator for MyIter {
+    type Item = ();
+    fn next(&mut self) -> Option<Self::Item> {
+        None
+    }
+}
+
+fn main() {
+    let _x = MyIter.by_ref()
+        .take(5)
+        .by_ref()
+        .take(5)
+        .by_ref();
+}
+"#,
+            expect![[r#"
+                [
+                    InlayHint {
+                        range: 174..241,
+                        kind: ChainingHint,
+                        label: [
+                            "impl Iterator<Item = ()>",
+                        ],
+                        tooltip: Some(
+                            HoverRanged(
+                                FileId(
+                                    0,
+                                ),
+                                174..241,
+                            ),
+                        ),
+                    },
+                    InlayHint {
+                        range: 174..224,
+                        kind: ChainingHint,
+                        label: [
+                            "impl Iterator<Item = ()>",
+                        ],
+                        tooltip: Some(
+                            HoverRanged(
+                                FileId(
+                                    0,
+                                ),
+                                174..224,
+                            ),
+                        ),
+                    },
+                    InlayHint {
+                        range: 174..206,
+                        kind: ChainingHint,
+                        label: [
+                            "impl Iterator<Item = ()>",
+                        ],
+                        tooltip: Some(
+                            HoverRanged(
+                                FileId(
+                                    0,
+                                ),
+                                174..206,
+                            ),
+                        ),
+                    },
+                    InlayHint {
+                        range: 174..189,
+                        kind: ChainingHint,
+                        label: [
+                            "&mut ",
+                            InlayHintLabelPart {
+                                text: "MyIter",
+                                linked_location: Some(
+                                    FileRange {
+                                        file_id: FileId(
+                                            0,
+                                        ),
+                                        range: 24..30,
+                                    },
+                                ),
+                            },
+                            "",
+                        ],
+                        tooltip: Some(
+                            HoverRanged(
+                                FileId(
+                                    0,
+                                ),
+                                174..189,
+                            ),
+                        ),
+                    },
+                ]
+            "#]],
+        );
+    }
+
+    #[test]
+    fn hints_in_attr_call() {
+        check_expect(
+            TEST_CONFIG,
+            r#"
+//- proc_macros: identity, input_replace
+struct Struct;
+impl Struct {
+    fn chain(self) -> Self {
+        self
+    }
+}
+#[proc_macros::identity]
+fn main() {
+    let strukt = Struct;
+    strukt
+        .chain()
+        .chain()
+        .chain();
+    Struct::chain(strukt);
+}
+"#,
+            expect![[r#"
+                [
+                    InlayHint {
+                        range: 124..130,
+                        kind: TypeHint,
+                        label: [
+                            "",
+                            InlayHintLabelPart {
+                                text: "Struct",
+                                linked_location: Some(
+                                    FileRange {
+                                        file_id: FileId(
+                                            0,
+                                        ),
+                                        range: 7..13,
+                                    },
+                                ),
+                            },
+                            "",
+                        ],
+                        tooltip: Some(
+                            HoverRanged(
+                                FileId(
+                                    0,
+                                ),
+                                124..130,
+                            ),
+                        ),
+                    },
+                    InlayHint {
+                        range: 145..185,
+                        kind: ChainingHint,
+                        label: [
+                            "",
+                            InlayHintLabelPart {
+                                text: "Struct",
+                                linked_location: Some(
+                                    FileRange {
+                                        file_id: FileId(
+                                            0,
+                                        ),
+                                        range: 7..13,
+                                    },
+                                ),
+                            },
+                            "",
+                        ],
+                        tooltip: Some(
+                            HoverRanged(
+                                FileId(
+                                    0,
+                                ),
+                                145..185,
+                            ),
+                        ),
+                    },
+                    InlayHint {
+                        range: 145..168,
+                        kind: ChainingHint,
+                        label: [
+                            "",
+                            InlayHintLabelPart {
+                                text: "Struct",
+                                linked_location: Some(
+                                    FileRange {
+                                        file_id: FileId(
+                                            0,
+                                        ),
+                                        range: 7..13,
+                                    },
+                                ),
+                            },
+                            "",
+                        ],
+                        tooltip: Some(
+                            HoverRanged(
+                                FileId(
+                                    0,
+                                ),
+                                145..168,
+                            ),
+                        ),
+                    },
+                    InlayHint {
+                        range: 222..228,
+                        kind: ParameterHint,
+                        label: [
+                            "self",
+                        ],
+                        tooltip: Some(
+                            HoverOffset(
+                                FileId(
+                                    0,
+                                ),
+                                42,
+                            ),
+                        ),
+                    },
+                ]
+            "#]],
+        );
+    }
+}
diff --git a/crates/ide/src/inlay_hints/closing_brace.rs b/crates/ide/src/inlay_hints/closing_brace.rs
new file mode 100644
index 0000000000..e340c64c54
--- /dev/null
+++ b/crates/ide/src/inlay_hints/closing_brace.rs
@@ -0,0 +1,196 @@
+//! Implementation of "closing brace" inlay hints:
+//! ```no_run
+//! fn g() {
+//! } /* fn g */
+//! ```
+use hir::{HirDisplay, Semantics};
+use ide_db::{base_db::FileRange, RootDatabase};
+use syntax::{
+    ast::{self, AstNode, HasName},
+    match_ast, SyntaxKind, SyntaxNode, T,
+};
+
+use crate::{
+    inlay_hints::InlayHintLabelPart, FileId, InlayHint, InlayHintLabel, InlayHintsConfig, InlayKind,
+};
+
+pub(super) fn hints(
+    acc: &mut Vec<InlayHint>,
+    sema: &Semantics<'_, RootDatabase>,
+    config: &InlayHintsConfig,
+    file_id: FileId,
+    node: SyntaxNode,
+) -> Option<()> {
+    let min_lines = config.closing_brace_hints_min_lines?;
+
+    let name = |it: ast::Name| it.syntax().text_range();
+
+    let mut closing_token;
+    let (label, name_range) = if let Some(item_list) = ast::AssocItemList::cast(node.clone()) {
+        closing_token = item_list.r_curly_token()?;
+
+        let parent = item_list.syntax().parent()?;
+        match_ast! {
+            match parent {
+                ast::Impl(imp) => {
+                    let imp = sema.to_def(&imp)?;
+                    let ty = imp.self_ty(sema.db);
+                    let trait_ = imp.trait_(sema.db);
+                    let hint_text = match trait_ {
+                        Some(tr) => format!("impl {} for {}", tr.name(sema.db), ty.display_truncated(sema.db, config.max_length)),
+                        None => format!("impl {}", ty.display_truncated(sema.db, config.max_length)),
+                    };
+                    (hint_text, None)
+                },
+                ast::Trait(tr) => {
+                    (format!("trait {}", tr.name()?), tr.name().map(name))
+                },
+                _ => return None,
+            }
+        }
+    } else if let Some(list) = ast::ItemList::cast(node.clone()) {
+        closing_token = list.r_curly_token()?;
+
+        let module = ast::Module::cast(list.syntax().parent()?)?;
+        (format!("mod {}", module.name()?), module.name().map(name))
+    } else if let Some(block) = ast::BlockExpr::cast(node.clone()) {
+        closing_token = block.stmt_list()?.r_curly_token()?;
+
+        let parent = block.syntax().parent()?;
+        match_ast! {
+            match parent {
+                ast::Fn(it) => {
+                    // FIXME: this could include parameters, but `HirDisplay` prints too much info
+                    // and doesn't respect the max length either, so the hints end up way too long
+                    (format!("fn {}", it.name()?), it.name().map(name))
+                },
+                ast::Static(it) => (format!("static {}", it.name()?), it.name().map(name)),
+                ast::Const(it) => {
+                    if it.underscore_token().is_some() {
+                        ("const _".into(), None)
+                    } else {
+                        (format!("const {}", it.name()?), it.name().map(name))
+                    }
+                },
+                _ => return None,
+            }
+        }
+    } else if let Some(mac) = ast::MacroCall::cast(node.clone()) {
+        let last_token = mac.syntax().last_token()?;
+        if last_token.kind() != T![;] && last_token.kind() != SyntaxKind::R_CURLY {
+            return None;
+        }
+        closing_token = last_token;
+
+        (
+            format!("{}!", mac.path()?),
+            mac.path().and_then(|it| it.segment()).map(|it| it.syntax().text_range()),
+        )
+    } else {
+        return None;
+    };
+
+    if let Some(mut next) = closing_token.next_token() {
+        if next.kind() == T![;] {
+            if let Some(tok) = next.next_token() {
+                closing_token = next;
+                next = tok;
+            }
+        }
+        if !(next.kind() == SyntaxKind::WHITESPACE && next.text().contains('\n')) {
+            // Only display the hint if the `}` is the last token on the line
+            return None;
+        }
+    }
+
+    let mut lines = 1;
+    node.text().for_each_chunk(|s| lines += s.matches('\n').count());
+    if lines < min_lines {
+        return None;
+    }
+
+    let linked_location = config
+        .location_links
+        .then(|| name_range.map(|range| FileRange { file_id, range }))
+        .flatten();
+    acc.push(InlayHint {
+        range: closing_token.text_range(),
+        kind: InlayKind::ClosingBraceHint,
+        label: InlayHintLabel { parts: vec![InlayHintLabelPart { text: label, linked_location }] },
+        tooltip: None, // provided by label part location
+    });
+
+    None
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::{
+        inlay_hints::tests::{check_with_config, DISABLED_CONFIG},
+        InlayHintsConfig,
+    };
+
+    #[test]
+    fn hints_closing_brace() {
+        check_with_config(
+            InlayHintsConfig { closing_brace_hints_min_lines: Some(2), ..DISABLED_CONFIG },
+            r#"
+fn a() {}
+
+fn f() {
+} // no hint unless `}` is the last token on the line
+
+fn g() {
+  }
+//^ fn g
+
+fn h<T>(with: T, arguments: u8, ...) {
+  }
+//^ fn h
+
+trait Tr {
+    fn f();
+    fn g() {
+    }
+  //^ fn g
+  }
+//^ trait Tr
+impl Tr for () {
+  }
+//^ impl Tr for ()
+impl dyn Tr {
+  }
+//^ impl dyn Tr
+
+static S0: () = 0;
+static S1: () = {};
+static S2: () = {
+ };
+//^ static S2
+const _: () = {
+ };
+//^ const _
+
+mod m {
+  }
+//^ mod m
+
+m! {}
+m!();
+m!(
+ );
+//^ m!
+
+m! {
+  }
+//^ m!
+
+fn f() {
+    let v = vec![
+    ];
+  }
+//^ fn f
+"#,
+        );
+    }
+}
diff --git a/crates/ide/src/inlay_hints/closure_ret.rs b/crates/ide/src/inlay_hints/closure_ret.rs
new file mode 100644
index 0000000000..d9929beaac
--- /dev/null
+++ b/crates/ide/src/inlay_hints/closure_ret.rs
@@ -0,0 +1,49 @@
+//! Implementation of "closure return type" inlay hints.
+use ide_db::{base_db::FileId, famous_defs::FamousDefs};
+use syntax::ast::{self, AstNode};
+
+use crate::{
+    inlay_hints::closure_has_block_body, ClosureReturnTypeHints, InlayHint, InlayHintsConfig,
+    InlayKind, InlayTooltip,
+};
+
+use super::label_of_ty;
+
+pub(super) fn hints(
+    acc: &mut Vec<InlayHint>,
+    famous_defs @ FamousDefs(sema, _): &FamousDefs<'_, '_>,
+    config: &InlayHintsConfig,
+    file_id: FileId,
+    closure: ast::ClosureExpr,
+) -> Option<()> {
+    if config.closure_return_type_hints == ClosureReturnTypeHints::Never {
+        return None;
+    }
+
+    if closure.ret_type().is_some() {
+        return None;
+    }
+
+    if !closure_has_block_body(&closure)
+        && config.closure_return_type_hints == ClosureReturnTypeHints::WithBlock
+    {
+        return None;
+    }
+
+    let param_list = closure.param_list()?;
+
+    let closure = sema.descend_node_into_attributes(closure).pop()?;
+    let ty = sema.type_of_expr(&ast::Expr::ClosureExpr(closure))?.adjusted();
+    let callable = ty.as_callable(sema.db)?;
+    let ty = callable.return_type();
+    if ty.is_unit() {
+        return None;
+    }
+    acc.push(InlayHint {
+        range: param_list.syntax().text_range(),
+        kind: InlayKind::ClosureReturnTypeHint,
+        label: label_of_ty(famous_defs, config, ty)?,
+        tooltip: Some(InlayTooltip::HoverRanged(file_id, param_list.syntax().text_range())),
+    });
+    Some(())
+}
diff --git a/crates/ide/src/inlay_hints/discriminant.rs b/crates/ide/src/inlay_hints/discriminant.rs
new file mode 100644
index 0000000000..f32c4bdf28
--- /dev/null
+++ b/crates/ide/src/inlay_hints/discriminant.rs
@@ -0,0 +1,142 @@
+//! Implementation of "enum variant discriminant" inlay hints:
+//! ```no_run
+//! enum Foo {
+//!    Bar/* = 0*/,
+//! }
+//! ```
+use ide_db::{base_db::FileId, famous_defs::FamousDefs};
+use syntax::ast::{self, AstNode, HasName};
+
+use crate::{DiscriminantHints, InlayHint, InlayHintsConfig, InlayKind, InlayTooltip};
+
+pub(super) fn hints(
+    acc: &mut Vec<InlayHint>,
+    FamousDefs(sema, _): &FamousDefs<'_, '_>,
+    config: &InlayHintsConfig,
+    _: FileId,
+    variant: &ast::Variant,
+) -> Option<()> {
+    let field_list = match config.discriminant_hints {
+        DiscriminantHints::Always => variant.field_list(),
+        DiscriminantHints::Fieldless => match variant.field_list() {
+            Some(_) => return None,
+            None => None,
+        },
+        DiscriminantHints::Never => return None,
+    };
+
+    if variant.eq_token().is_some() {
+        return None;
+    }
+
+    let name = variant.name()?;
+
+    let descended = sema.descend_node_into_attributes(variant.clone()).pop();
+    let desc_pat = descended.as_ref().unwrap_or(variant);
+    let v = sema.to_def(desc_pat)?;
+    let d = v.eval(sema.db);
+
+    acc.push(InlayHint {
+        range: match field_list {
+            Some(field_list) => name.syntax().text_range().cover(field_list.syntax().text_range()),
+            None => name.syntax().text_range(),
+        },
+        kind: InlayKind::DiscriminantHint,
+        label: match &d {
+            Ok(v) => format!("{}", v).into(),
+            Err(_) => "?".into(),
+        },
+        tooltip: Some(InlayTooltip::String(match &d {
+            Ok(_) => "enum variant discriminant".into(),
+            Err(e) => format!("{e:?}").into(),
+        })),
+    });
+
+    Some(())
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::inlay_hints::{
+        tests::{check_with_config, DISABLED_CONFIG},
+        DiscriminantHints, InlayHintsConfig,
+    };
+
+    #[track_caller]
+    fn check_discriminants(ra_fixture: &str) {
+        check_with_config(
+            InlayHintsConfig { discriminant_hints: DiscriminantHints::Always, ..DISABLED_CONFIG },
+            ra_fixture,
+        );
+    }
+
+    #[track_caller]
+    fn check_discriminants_fieldless(ra_fixture: &str) {
+        check_with_config(
+            InlayHintsConfig {
+                discriminant_hints: DiscriminantHints::Fieldless,
+                ..DISABLED_CONFIG
+            },
+            ra_fixture,
+        );
+    }
+
+    #[test]
+    fn fieldless() {
+        check_discriminants(
+            r#"
+enum Enum {
+    Variant,
+  //^^^^^^^0
+    Variant1,
+  //^^^^^^^^1
+    Variant2,
+  //^^^^^^^^2
+    Variant5 = 5,
+    Variant6,
+  //^^^^^^^^6
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn datacarrying_mixed() {
+        check_discriminants(
+            r#"
+enum Enum {
+    Variant(),
+  //^^^^^^^^^0
+    Variant1,
+  //^^^^^^^^1
+    Variant2 {},
+  //^^^^^^^^^^^2
+    Variant3,
+  //^^^^^^^^3
+    Variant5 = 5,
+    Variant6,
+  //^^^^^^^^6
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn datacarrying_mixed_fieldless_set() {
+        check_discriminants_fieldless(
+            r#"
+enum Enum {
+    Variant(),
+    Variant1,
+  //^^^^^^^^1
+    Variant2 {},
+    Variant3,
+  //^^^^^^^^3
+    Variant5 = 5,
+    Variant6,
+  //^^^^^^^^6
+}
+"#,
+        );
+    }
+}
diff --git a/crates/ide/src/inlay_hints/fn_lifetime_fn.rs b/crates/ide/src/inlay_hints/fn_lifetime_fn.rs
new file mode 100644
index 0000000000..2aa5e3dc73
--- /dev/null
+++ b/crates/ide/src/inlay_hints/fn_lifetime_fn.rs
@@ -0,0 +1,325 @@
+//! Implementation of "lifetime elision" inlay hints:
+//! ```no_run
+//! fn example/* <'0> */(a: &/* '0 */()) {}
+//! ```
+use ide_db::{syntax_helpers::node_ext::walk_ty, FxHashMap};
+use itertools::Itertools;
+use syntax::SmolStr;
+use syntax::{
+    ast::{self, AstNode, HasGenericParams, HasName},
+    SyntaxToken,
+};
+
+use crate::{InlayHint, InlayHintsConfig, InlayKind, InlayTooltip, LifetimeElisionHints};
+
+pub(super) fn hints(
+    acc: &mut Vec<InlayHint>,
+    config: &InlayHintsConfig,
+    func: ast::Fn,
+) -> Option<()> {
+    if config.lifetime_elision_hints == LifetimeElisionHints::Never {
+        return None;
+    }
+
+    let mk_lt_hint = |t: SyntaxToken, label: String| InlayHint {
+        range: t.text_range(),
+        kind: InlayKind::LifetimeHint,
+        label: label.into(),
+        tooltip: Some(InlayTooltip::String("Elided lifetime".into())),
+    };
+
+    let param_list = func.param_list()?;
+    let generic_param_list = func.generic_param_list();
+    let ret_type = func.ret_type();
+    let self_param = param_list.self_param().filter(|it| it.amp_token().is_some());
+
+    let is_elided = |lt: &Option<ast::Lifetime>| match lt {
+        Some(lt) => matches!(lt.text().as_str(), "'_"),
+        None => true,
+    };
+
+    let potential_lt_refs = {
+        let mut acc: Vec<_> = vec![];
+        if let Some(self_param) = &self_param {
+            let lifetime = self_param.lifetime();
+            let is_elided = is_elided(&lifetime);
+            acc.push((None, self_param.amp_token(), lifetime, is_elided));
+        }
+        param_list.params().filter_map(|it| Some((it.pat(), it.ty()?))).for_each(|(pat, ty)| {
+            // FIXME: check path types
+            walk_ty(&ty, &mut |ty| match ty {
+                ast::Type::RefType(r) => {
+                    let lifetime = r.lifetime();
+                    let is_elided = is_elided(&lifetime);
+                    acc.push((
+                        pat.as_ref().and_then(|it| match it {
+                            ast::Pat::IdentPat(p) => p.name(),
+                            _ => None,
+                        }),
+                        r.amp_token(),
+                        lifetime,
+                        is_elided,
+                    ));
+                    false
+                }
+                ast::Type::FnPtrType(_) => true,
+                ast::Type::PathType(t) => {
+                    t.path().and_then(|it| it.segment()).and_then(|it| it.param_list()).is_some()
+                }
+                _ => false,
+            })
+        });
+        acc
+    };
+
+    // allocate names
+    let mut gen_idx_name = {
+        let mut gen = (0u8..).map(|idx| match idx {
+            idx if idx < 10 => SmolStr::from_iter(['\'', (idx + 48) as char]),
+            idx => format!("'{idx}").into(),
+        });
+        move || gen.next().unwrap_or_default()
+    };
+    let mut allocated_lifetimes = vec![];
+
+    let mut used_names: FxHashMap<SmolStr, usize> =
+        match config.param_names_for_lifetime_elision_hints {
+            true => generic_param_list
+                .iter()
+                .flat_map(|gpl| gpl.lifetime_params())
+                .filter_map(|param| param.lifetime())
+                .filter_map(|lt| Some((SmolStr::from(lt.text().as_str().get(1..)?), 0)))
+                .collect(),
+            false => Default::default(),
+        };
+    {
+        let mut potential_lt_refs = potential_lt_refs.iter().filter(|&&(.., is_elided)| is_elided);
+        if let Some(_) = &self_param {
+            if let Some(_) = potential_lt_refs.next() {
+                allocated_lifetimes.push(if config.param_names_for_lifetime_elision_hints {
+                    // self can't be used as a lifetime, so no need to check for collisions
+                    "'self".into()
+                } else {
+                    gen_idx_name()
+                });
+            }
+        }
+        potential_lt_refs.for_each(|(name, ..)| {
+            let name = match name {
+                Some(it) if config.param_names_for_lifetime_elision_hints => {
+                    if let Some(c) = used_names.get_mut(it.text().as_str()) {
+                        *c += 1;
+                        SmolStr::from(format!("'{text}{c}", text = it.text().as_str()))
+                    } else {
+                        used_names.insert(it.text().as_str().into(), 0);
+                        SmolStr::from_iter(["\'", it.text().as_str()])
+                    }
+                }
+                _ => gen_idx_name(),
+            };
+            allocated_lifetimes.push(name);
+        });
+    }
+
+    // fetch output lifetime if elision rule applies
+    let output = match potential_lt_refs.as_slice() {
+        [(_, _, lifetime, _), ..] if self_param.is_some() || potential_lt_refs.len() == 1 => {
+            match lifetime {
+                Some(lt) => match lt.text().as_str() {
+                    "'_" => allocated_lifetimes.get(0).cloned(),
+                    "'static" => None,
+                    name => Some(name.into()),
+                },
+                None => allocated_lifetimes.get(0).cloned(),
+            }
+        }
+        [..] => None,
+    };
+
+    if allocated_lifetimes.is_empty() && output.is_none() {
+        return None;
+    }
+
+    // apply hints
+    // apply output if required
+    let mut is_trivial = true;
+    if let (Some(output_lt), Some(r)) = (&output, ret_type) {
+        if let Some(ty) = r.ty() {
+            walk_ty(&ty, &mut |ty| match ty {
+                ast::Type::RefType(ty) if ty.lifetime().is_none() => {
+                    if let Some(amp) = ty.amp_token() {
+                        is_trivial = false;
+                        acc.push(mk_lt_hint(amp, output_lt.to_string()));
+                    }
+                    false
+                }
+                ast::Type::FnPtrType(_) => true,
+                ast::Type::PathType(t) => {
+                    t.path().and_then(|it| it.segment()).and_then(|it| it.param_list()).is_some()
+                }
+                _ => false,
+            })
+        }
+    }
+
+    if config.lifetime_elision_hints == LifetimeElisionHints::SkipTrivial && is_trivial {
+        return None;
+    }
+
+    let mut a = allocated_lifetimes.iter();
+    for (_, amp_token, _, is_elided) in potential_lt_refs {
+        if is_elided {
+            let t = amp_token?;
+            let lt = a.next()?;
+            acc.push(mk_lt_hint(t, lt.to_string()));
+        }
+    }
+
+    // generate generic param list things
+    match (generic_param_list, allocated_lifetimes.as_slice()) {
+        (_, []) => (),
+        (Some(gpl), allocated_lifetimes) => {
+            let angle_tok = gpl.l_angle_token()?;
+            let is_empty = gpl.generic_params().next().is_none();
+            acc.push(InlayHint {
+                range: angle_tok.text_range(),
+                kind: InlayKind::LifetimeHint,
+                label: format!(
+                    "{}{}",
+                    allocated_lifetimes.iter().format(", "),
+                    if is_empty { "" } else { ", " }
+                )
+                .into(),
+                tooltip: Some(InlayTooltip::String("Elided lifetimes".into())),
+            });
+        }
+        (None, allocated_lifetimes) => acc.push(InlayHint {
+            range: func.name()?.syntax().text_range(),
+            kind: InlayKind::GenericParamListHint,
+            label: format!("<{}>", allocated_lifetimes.iter().format(", "),).into(),
+            tooltip: Some(InlayTooltip::String("Elided lifetimes".into())),
+        }),
+    }
+    Some(())
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::{
+        inlay_hints::tests::{check, check_with_config, TEST_CONFIG},
+        InlayHintsConfig, LifetimeElisionHints,
+    };
+
+    #[test]
+    fn hints_lifetimes() {
+        check(
+            r#"
+fn empty() {}
+
+fn no_gpl(a: &()) {}
+ //^^^^^^<'0>
+          // ^'0
+fn empty_gpl<>(a: &()) {}
+      //    ^'0   ^'0
+fn partial<'b>(a: &(), b: &'b ()) {}
+//        ^'0, $  ^'0
+fn partial<'a>(a: &'a (), b: &()) {}
+//        ^'0, $             ^'0
+
+fn single_ret(a: &()) -> &() {}
+// ^^^^^^^^^^<'0>
+              // ^'0     ^'0
+fn full_mul(a: &(), b: &()) {}
+// ^^^^^^^^<'0, '1>
+            // ^'0     ^'1
+
+fn foo<'c>(a: &'c ()) -> &() {}
+                      // ^'c
+
+fn nested_in(a: &   &X< &()>) {}
+// ^^^^^^^^^<'0, '1, '2>
+              //^'0 ^'1 ^'2
+fn nested_out(a: &()) -> &   &X< &()>{}
+// ^^^^^^^^^^<'0>
+               //^'0     ^'0 ^'0 ^'0
+
+impl () {
+    fn foo(&self) {}
+    // ^^^<'0>
+        // ^'0
+    fn foo(&self) -> &() {}
+    // ^^^<'0>
+        // ^'0       ^'0
+    fn foo(&self, a: &()) -> &() {}
+    // ^^^<'0, '1>
+        // ^'0       ^'1     ^'0
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn hints_lifetimes_named() {
+        check_with_config(
+            InlayHintsConfig { param_names_for_lifetime_elision_hints: true, ..TEST_CONFIG },
+            r#"
+fn nested_in<'named>(named: &        &X<      &()>) {}
+//          ^'named1, 'named2, 'named3, $
+                          //^'named1 ^'named2 ^'named3
+"#,
+        );
+    }
+
+    #[test]
+    fn hints_lifetimes_trivial_skip() {
+        check_with_config(
+            InlayHintsConfig {
+                lifetime_elision_hints: LifetimeElisionHints::SkipTrivial,
+                ..TEST_CONFIG
+            },
+            r#"
+fn no_gpl(a: &()) {}
+fn empty_gpl<>(a: &()) {}
+fn partial<'b>(a: &(), b: &'b ()) {}
+fn partial<'a>(a: &'a (), b: &()) {}
+
+fn single_ret(a: &()) -> &() {}
+// ^^^^^^^^^^<'0>
+              // ^'0     ^'0
+fn full_mul(a: &(), b: &()) {}
+
+fn foo<'c>(a: &'c ()) -> &() {}
+                      // ^'c
+
+fn nested_in(a: &   &X< &()>) {}
+fn nested_out(a: &()) -> &   &X< &()>{}
+// ^^^^^^^^^^<'0>
+               //^'0     ^'0 ^'0 ^'0
+
+impl () {
+    fn foo(&self) {}
+    fn foo(&self) -> &() {}
+    // ^^^<'0>
+        // ^'0       ^'0
+    fn foo(&self, a: &()) -> &() {}
+    // ^^^<'0, '1>
+        // ^'0       ^'1     ^'0
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn hints_lifetimes_skip_fn_likes() {
+        check_with_config(
+            InlayHintsConfig {
+                lifetime_elision_hints: LifetimeElisionHints::Always,
+                ..TEST_CONFIG
+            },
+            r#"
+fn fn_ptr(a: fn(&()) -> &()) {}
+fn fn_trait<>(a: impl Fn(&()) -> &()) {}
+"#,
+        );
+    }
+}
diff --git a/crates/ide/src/inlay_hints/implicit_static.rs b/crates/ide/src/inlay_hints/implicit_static.rs
new file mode 100644
index 0000000000..588a0e3b6a
--- /dev/null
+++ b/crates/ide/src/inlay_hints/implicit_static.rs
@@ -0,0 +1,75 @@
+//! Implementation of "implicit static" inlay hints:
+//! ```no_run
+//! static S: &/* 'static */str = "";
+//! ```
+use either::Either;
+use syntax::{
+    ast::{self, AstNode},
+    SyntaxKind,
+};
+
+use crate::{InlayHint, InlayHintsConfig, InlayKind, InlayTooltip, LifetimeElisionHints};
+
+pub(super) fn hints(
+    acc: &mut Vec<InlayHint>,
+    config: &InlayHintsConfig,
+    statik_or_const: Either<ast::Static, ast::Const>,
+) -> Option<()> {
+    if config.lifetime_elision_hints != LifetimeElisionHints::Always {
+        return None;
+    }
+
+    if let Either::Right(it) = &statik_or_const {
+        if ast::AssocItemList::can_cast(
+            it.syntax().parent().map_or(SyntaxKind::EOF, |it| it.kind()),
+        ) {
+            return None;
+        }
+    }
+
+    if let Some(ast::Type::RefType(ty)) = statik_or_const.either(|it| it.ty(), |it| it.ty()) {
+        if ty.lifetime().is_none() {
+            let t = ty.amp_token()?;
+            acc.push(InlayHint {
+                range: t.text_range(),
+                kind: InlayKind::LifetimeHint,
+                label: "'static".to_owned().into(),
+                tooltip: Some(InlayTooltip::String("Elided static lifetime".into())),
+            });
+        }
+    }
+
+    Some(())
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::{
+        inlay_hints::tests::{check_with_config, TEST_CONFIG},
+        InlayHintsConfig, LifetimeElisionHints,
+    };
+
+    #[test]
+    fn hints_lifetimes_static() {
+        check_with_config(
+            InlayHintsConfig {
+                lifetime_elision_hints: LifetimeElisionHints::Always,
+                ..TEST_CONFIG
+            },
+            r#"
+trait Trait {}
+static S: &str = "";
+//        ^'static
+const C: &str = "";
+//       ^'static
+const C: &dyn Trait = panic!();
+//       ^'static
+
+impl () {
+    const C: &str = "";
+    const C: &dyn Trait = panic!();
+}
+"#,
+        );
+    }
+}
diff --git a/crates/ide/src/inlay_hints/param_name.rs b/crates/ide/src/inlay_hints/param_name.rs
new file mode 100644
index 0000000000..ecee67632e
--- /dev/null
+++ b/crates/ide/src/inlay_hints/param_name.rs
@@ -0,0 +1,546 @@
+//! Implementation of "param name" inlay hints:
+//! ```no_run
+//! fn max(x: i32, y: i32) -> i32 { x + y }
+//! _ = max(/*x*/4, /*y*/4);
+//! ```
+use either::Either;
+use hir::{Callable, Semantics};
+use ide_db::{base_db::FileRange, RootDatabase};
+
+use stdx::to_lower_snake_case;
+use syntax::ast::{self, AstNode, HasArgList, HasName, UnaryOp};
+
+use crate::{InlayHint, InlayHintsConfig, InlayKind, InlayTooltip};
+
+pub(super) fn hints(
+    acc: &mut Vec<InlayHint>,
+    sema: &Semantics<'_, RootDatabase>,
+    config: &InlayHintsConfig,
+    expr: ast::Expr,
+) -> Option<()> {
+    if !config.parameter_hints {
+        return None;
+    }
+
+    let (callable, arg_list) = get_callable(sema, &expr)?;
+    let hints = callable
+        .params(sema.db)
+        .into_iter()
+        .zip(arg_list.args())
+        .filter_map(|((param, _ty), arg)| {
+            // Only annotate hints for expressions that exist in the original file
+            let range = sema.original_range_opt(arg.syntax())?;
+            let (param_name, name_syntax) = match param.as_ref()? {
+                Either::Left(pat) => ("self".to_string(), pat.name()),
+                Either::Right(pat) => match pat {
+                    ast::Pat::IdentPat(it) => (it.name()?.to_string(), it.name()),
+                    _ => return None,
+                },
+            };
+            Some((name_syntax, param_name, arg, range))
+        })
+        .filter(|(_, param_name, arg, _)| {
+            !should_hide_param_name_hint(sema, &callable, param_name, arg)
+        })
+        .map(|(param, param_name, _, FileRange { range, .. })| {
+            let mut tooltip = None;
+            if let Some(name) = param {
+                if let hir::CallableKind::Function(f) = callable.kind() {
+                    // assert the file is cached so we can map out of macros
+                    if let Some(_) = sema.source(f) {
+                        tooltip = sema.original_range_opt(name.syntax());
+                    }
+                }
+            }
+
+            InlayHint {
+                range,
+                kind: InlayKind::ParameterHint,
+                label: param_name.into(),
+                tooltip: tooltip.map(|it| InlayTooltip::HoverOffset(it.file_id, it.range.start())),
+            }
+        });
+
+    acc.extend(hints);
+    Some(())
+}
+
+fn get_callable(
+    sema: &Semantics<'_, RootDatabase>,
+    expr: &ast::Expr,
+) -> Option<(hir::Callable, ast::ArgList)> {
+    match expr {
+        ast::Expr::CallExpr(expr) => {
+            let descended = sema.descend_node_into_attributes(expr.clone()).pop();
+            let expr = descended.as_ref().unwrap_or(expr);
+            sema.type_of_expr(&expr.expr()?)?.original.as_callable(sema.db).zip(expr.arg_list())
+        }
+        ast::Expr::MethodCallExpr(expr) => {
+            let descended = sema.descend_node_into_attributes(expr.clone()).pop();
+            let expr = descended.as_ref().unwrap_or(expr);
+            sema.resolve_method_call_as_callable(expr).zip(expr.arg_list())
+        }
+        _ => None,
+    }
+}
+
+fn should_hide_param_name_hint(
+    sema: &Semantics<'_, RootDatabase>,
+    callable: &hir::Callable,
+    param_name: &str,
+    argument: &ast::Expr,
+) -> bool {
+    // These are to be tested in the `parameter_hint_heuristics` test
+    // hide when:
+    // - the parameter name is a suffix of the function's name
+    // - the argument is a qualified constructing or call expression where the qualifier is an ADT
+    // - exact argument<->parameter match(ignoring leading underscore) or parameter is a prefix/suffix
+    //   of argument with _ splitting it off
+    // - param starts with `ra_fixture`
+    // - param is a well known name in a unary function
+
+    let param_name = param_name.trim_start_matches('_');
+    if param_name.is_empty() {
+        return true;
+    }
+
+    if matches!(argument, ast::Expr::PrefixExpr(prefix) if prefix.op_kind() == Some(UnaryOp::Not)) {
+        return false;
+    }
+
+    let fn_name = match callable.kind() {
+        hir::CallableKind::Function(it) => Some(it.name(sema.db).to_smol_str()),
+        _ => None,
+    };
+    let fn_name = fn_name.as_deref();
+    is_param_name_suffix_of_fn_name(param_name, callable, fn_name)
+        || is_argument_similar_to_param_name(argument, param_name)
+        || param_name.starts_with("ra_fixture")
+        || (callable.n_params() == 1 && is_obvious_param(param_name))
+        || is_adt_constructor_similar_to_param_name(sema, argument, param_name)
+}
+
+/// Hide the parameter name of a unary function if it is a `_` - prefixed suffix of the function's name, or equal.
+///
+/// `fn strip_suffix(suffix)` will be hidden.
+/// `fn stripsuffix(suffix)` will not be hidden.
+fn is_param_name_suffix_of_fn_name(
+    param_name: &str,
+    callable: &Callable,
+    fn_name: Option<&str>,
+) -> bool {
+    match (callable.n_params(), fn_name) {
+        (1, Some(function)) => {
+            function == param_name
+                || function
+                    .len()
+                    .checked_sub(param_name.len())
+                    .and_then(|at| function.is_char_boundary(at).then(|| function.split_at(at)))
+                    .map_or(false, |(prefix, suffix)| {
+                        suffix.eq_ignore_ascii_case(param_name) && prefix.ends_with('_')
+                    })
+        }
+        _ => false,
+    }
+}
+
+fn is_argument_similar_to_param_name(argument: &ast::Expr, param_name: &str) -> bool {
+    // check whether param_name and argument are the same or
+    // whether param_name is a prefix/suffix of argument(split at `_`)
+    let argument = match get_string_representation(argument) {
+        Some(argument) => argument,
+        None => return false,
+    };
+
+    // std is honestly too panic happy...
+    let str_split_at = |str: &str, at| str.is_char_boundary(at).then(|| argument.split_at(at));
+
+    let param_name = param_name.trim_start_matches('_');
+    let argument = argument.trim_start_matches('_');
+
+    match str_split_at(argument, param_name.len()) {
+        Some((prefix, rest)) if prefix.eq_ignore_ascii_case(param_name) => {
+            return rest.is_empty() || rest.starts_with('_');
+        }
+        _ => (),
+    }
+    match argument.len().checked_sub(param_name.len()).and_then(|at| str_split_at(argument, at)) {
+        Some((rest, suffix)) if param_name.eq_ignore_ascii_case(suffix) => {
+            return rest.is_empty() || rest.ends_with('_');
+        }
+        _ => (),
+    }
+    false
+}
+
+fn get_string_representation(expr: &ast::Expr) -> Option<String> {
+    match expr {
+        ast::Expr::MethodCallExpr(method_call_expr) => {
+            let name_ref = method_call_expr.name_ref()?;
+            match name_ref.text().as_str() {
+                "clone" | "as_ref" => method_call_expr.receiver().map(|rec| rec.to_string()),
+                name_ref => Some(name_ref.to_owned()),
+            }
+        }
+        ast::Expr::MacroExpr(macro_expr) => {
+            Some(macro_expr.macro_call()?.path()?.segment()?.to_string())
+        }
+        ast::Expr::FieldExpr(field_expr) => Some(field_expr.name_ref()?.to_string()),
+        ast::Expr::PathExpr(path_expr) => Some(path_expr.path()?.segment()?.to_string()),
+        ast::Expr::PrefixExpr(prefix_expr) => get_string_representation(&prefix_expr.expr()?),
+        ast::Expr::RefExpr(ref_expr) => get_string_representation(&ref_expr.expr()?),
+        ast::Expr::CastExpr(cast_expr) => get_string_representation(&cast_expr.expr()?),
+        _ => None,
+    }
+}
+
+fn is_obvious_param(param_name: &str) -> bool {
+    // avoid displaying hints for common functions like map, filter, etc.
+    // or other obvious words used in std
+    let is_obvious_param_name =
+        matches!(param_name, "predicate" | "value" | "pat" | "rhs" | "other");
+    param_name.len() == 1 || is_obvious_param_name
+}
+
+fn is_adt_constructor_similar_to_param_name(
+    sema: &Semantics<'_, RootDatabase>,
+    argument: &ast::Expr,
+    param_name: &str,
+) -> bool {
+    let path = match argument {
+        ast::Expr::CallExpr(c) => c.expr().and_then(|e| match e {
+            ast::Expr::PathExpr(p) => p.path(),
+            _ => None,
+        }),
+        ast::Expr::PathExpr(p) => p.path(),
+        ast::Expr::RecordExpr(r) => r.path(),
+        _ => return false,
+    };
+    let path = match path {
+        Some(it) => it,
+        None => return false,
+    };
+    (|| match sema.resolve_path(&path)? {
+        hir::PathResolution::Def(hir::ModuleDef::Adt(_)) => {
+            Some(to_lower_snake_case(&path.segment()?.name_ref()?.text()) == param_name)
+        }
+        hir::PathResolution::Def(hir::ModuleDef::Function(_) | hir::ModuleDef::Variant(_)) => {
+            if to_lower_snake_case(&path.segment()?.name_ref()?.text()) == param_name {
+                return Some(true);
+            }
+            let qual = path.qualifier()?;
+            match sema.resolve_path(&qual)? {
+                hir::PathResolution::Def(hir::ModuleDef::Adt(_)) => {
+                    Some(to_lower_snake_case(&qual.segment()?.name_ref()?.text()) == param_name)
+                }
+                _ => None,
+            }
+        }
+        _ => None,
+    })()
+    .unwrap_or(false)
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::{
+        inlay_hints::tests::{check_with_config, DISABLED_CONFIG},
+        InlayHintsConfig,
+    };
+
+    #[track_caller]
+    fn check_params(ra_fixture: &str) {
+        check_with_config(
+            InlayHintsConfig { parameter_hints: true, ..DISABLED_CONFIG },
+            ra_fixture,
+        );
+    }
+
+    #[test]
+    fn param_hints_only() {
+        check_params(
+            r#"
+fn foo(a: i32, b: i32) -> i32 { a + b }
+fn main() {
+    let _x = foo(
+        4,
+      //^ a
+        4,
+      //^ b
+    );
+}"#,
+        );
+    }
+
+    #[test]
+    fn param_hints_on_closure() {
+        check_params(
+            r#"
+fn main() {
+    let clo = |a: u8, b: u8| a + b;
+    clo(
+        1,
+      //^ a
+        2,
+      //^ b
+    );
+}
+            "#,
+        );
+    }
+
+    #[test]
+    fn param_name_similar_to_fn_name_still_hints() {
+        check_params(
+            r#"
+fn max(x: i32, y: i32) -> i32 { x + y }
+fn main() {
+    let _x = max(
+        4,
+      //^ x
+        4,
+      //^ y
+    );
+}"#,
+        );
+    }
+
+    #[test]
+    fn param_name_similar_to_fn_name() {
+        check_params(
+            r#"
+fn param_with_underscore(with_underscore: i32) -> i32 { with_underscore }
+fn main() {
+    let _x = param_with_underscore(
+        4,
+    );
+}"#,
+        );
+        check_params(
+            r#"
+fn param_with_underscore(underscore: i32) -> i32 { underscore }
+fn main() {
+    let _x = param_with_underscore(
+        4,
+    );
+}"#,
+        );
+    }
+
+    #[test]
+    fn param_name_same_as_fn_name() {
+        check_params(
+            r#"
+fn foo(foo: i32) -> i32 { foo }
+fn main() {
+    let _x = foo(
+        4,
+    );
+}"#,
+        );
+    }
+
+    #[test]
+    fn never_hide_param_when_multiple_params() {
+        check_params(
+            r#"
+fn foo(foo: i32, bar: i32) -> i32 { bar + baz }
+fn main() {
+    let _x = foo(
+        4,
+      //^ foo
+        8,
+      //^ bar
+    );
+}"#,
+        );
+    }
+
+    #[test]
+    fn param_hints_look_through_as_ref_and_clone() {
+        check_params(
+            r#"
+fn foo(bar: i32, baz: f32) {}
+
+fn main() {
+    let bar = 3;
+    let baz = &"baz";
+    let fez = 1.0;
+    foo(bar.clone(), bar.clone());
+                   //^^^^^^^^^^^ baz
+    foo(bar.as_ref(), bar.as_ref());
+                    //^^^^^^^^^^^^ baz
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn self_param_hints() {
+        check_params(
+            r#"
+struct Foo;
+
+impl Foo {
+    fn foo(self: Self) {}
+    fn bar(self: &Self) {}
+}
+
+fn main() {
+    Foo::foo(Foo);
+           //^^^ self
+    Foo::bar(&Foo);
+           //^^^^ self
+}
+"#,
+        )
+    }
+
+    #[test]
+    fn param_name_hints_show_for_literals() {
+        check_params(
+            r#"pub fn test(a: i32, b: i32) -> [i32; 2] { [a, b] }
+fn main() {
+    test(
+        0xa_b,
+      //^^^^^ a
+        0xa_b,
+      //^^^^^ b
+    );
+}"#,
+        )
+    }
+
+    #[test]
+    fn function_call_parameter_hint() {
+        check_params(
+            r#"
+//- minicore: option
+struct FileId {}
+struct SmolStr {}
+
+struct TextRange {}
+struct SyntaxKind {}
+struct NavigationTarget {}
+
+struct Test {}
+
+impl Test {
+    fn method(&self, mut param: i32) -> i32 { param * 2 }
+
+    fn from_syntax(
+        file_id: FileId,
+        name: SmolStr,
+        focus_range: Option<TextRange>,
+        full_range: TextRange,
+        kind: SyntaxKind,
+        docs: Option<String>,
+    ) -> NavigationTarget {
+        NavigationTarget {}
+    }
+}
+
+fn test_func(mut foo: i32, bar: i32, msg: &str, _: i32, last: i32) -> i32 {
+    foo + bar
+}
+
+fn main() {
+    let not_literal = 1;
+    let _: i32 = test_func(1,    2,      "hello", 3,  not_literal);
+                         //^ foo ^ bar   ^^^^^^^ msg  ^^^^^^^^^^^ last
+    let t: Test = Test {};
+    t.method(123);
+           //^^^ param
+    Test::method(&t,      3456);
+               //^^ self  ^^^^ param
+    Test::from_syntax(
+        FileId {},
+        "impl".into(),
+      //^^^^^^^^^^^^^ name
+        None,
+      //^^^^ focus_range
+        TextRange {},
+      //^^^^^^^^^^^^ full_range
+        SyntaxKind {},
+      //^^^^^^^^^^^^^ kind
+        None,
+      //^^^^ docs
+    );
+}"#,
+        );
+    }
+
+    #[test]
+    fn parameter_hint_heuristics() {
+        check_params(
+            r#"
+fn check(ra_fixture_thing: &str) {}
+
+fn map(f: i32) {}
+fn filter(predicate: i32) {}
+
+fn strip_suffix(suffix: &str) {}
+fn stripsuffix(suffix: &str) {}
+fn same(same: u32) {}
+fn same2(_same2: u32) {}
+
+fn enum_matches_param_name(completion_kind: CompletionKind) {}
+
+fn foo(param: u32) {}
+fn bar(param_eter: u32) {}
+
+enum CompletionKind {
+    Keyword,
+}
+
+fn non_ident_pat((a, b): (u32, u32)) {}
+
+fn main() {
+    const PARAM: u32 = 0;
+    foo(PARAM);
+    foo(!PARAM);
+     // ^^^^^^ param
+    check("");
+
+    map(0);
+    filter(0);
+
+    strip_suffix("");
+    stripsuffix("");
+              //^^ suffix
+    same(0);
+    same2(0);
+
+    enum_matches_param_name(CompletionKind::Keyword);
+
+    let param = 0;
+    foo(param);
+    foo(param as _);
+    let param_end = 0;
+    foo(param_end);
+    let start_param = 0;
+    foo(start_param);
+    let param2 = 0;
+    foo(param2);
+      //^^^^^^ param
+
+    macro_rules! param {
+        () => {};
+    };
+    foo(param!());
+
+    let param_eter = 0;
+    bar(param_eter);
+    let param_eter_end = 0;
+    bar(param_eter_end);
+    let start_param_eter = 0;
+    bar(start_param_eter);
+    let param_eter2 = 0;
+    bar(param_eter2);
+      //^^^^^^^^^^^ param_eter
+
+    non_ident_pat((0, 0));
+}"#,
+        );
+    }
+}
diff --git a/crates/ide/src/lib.rs b/crates/ide/src/lib.rs
index 7402e86f36..239456cb28 100644
--- a/crates/ide/src/lib.rs
+++ b/crates/ide/src/lib.rs
@@ -81,8 +81,8 @@ pub use crate::{
     highlight_related::{HighlightRelatedConfig, HighlightedRange},
     hover::{HoverAction, HoverConfig, HoverDocFormat, HoverGotoTypeData, HoverResult},
     inlay_hints::{
-        AdjustmentHints, ClosureReturnTypeHints, InlayHint, InlayHintLabel, InlayHintsConfig,
-        InlayKind, InlayTooltip, LifetimeElisionHints,
+        AdjustmentHints, AdjustmentHintsMode, ClosureReturnTypeHints, DiscriminantHints, InlayHint,
+        InlayHintLabel, InlayHintsConfig, InlayKind, InlayTooltip, LifetimeElisionHints,
     },
     join_lines::JoinLinesConfig,
     markup::Markup,
@@ -236,6 +236,7 @@ impl Analysis {
             Ok(Vec::new()),
             false,
             CrateOrigin::CratesIo { repo: None, name: None },
+            None,
         );
         change.change_file(file_id, Some(Arc::new(text)));
         change.set_crate_graph(crate_graph);
diff --git a/crates/ide/src/markup.rs b/crates/ide/src/markup.rs
index 60c193c40a..de9fef61a7 100644
--- a/crates/ide/src/markup.rs
+++ b/crates/ide/src/markup.rs
@@ -33,6 +33,6 @@ impl Markup {
         self.text.as_str()
     }
     pub fn fenced_block(contents: &impl fmt::Display) -> Markup {
-        format!("```rust\n{}\n```", contents).into()
+        format!("```rust\n{contents}\n```").into()
     }
 }
diff --git a/crates/ide/src/moniker.rs b/crates/ide/src/moniker.rs
index fcbf6d8e58..af5e96d238 100644
--- a/crates/ide/src/moniker.rs
+++ b/crates/ide/src/moniker.rs
@@ -273,7 +273,7 @@ mod tests {
     fn no_moniker(ra_fixture: &str) {
         let (analysis, position) = fixture::position(ra_fixture);
         if let Some(x) = analysis.moniker(position).unwrap() {
-            assert_eq!(x.info.len(), 0, "Moniker founded but no moniker expected: {:?}", x);
+            assert_eq!(x.info.len(), 0, "Moniker founded but no moniker expected: {x:?}");
         }
     }
 
diff --git a/crates/ide/src/navigation_target.rs b/crates/ide/src/navigation_target.rs
index 9f049e298a..3aa799d43a 100644
--- a/crates/ide/src/navigation_target.rs
+++ b/crates/ide/src/navigation_target.rs
@@ -117,10 +117,10 @@ impl NavigationTarget {
             self.full_range
         );
         if let Some(focus_range) = self.focus_range {
-            buf.push_str(&format!(" {:?}", focus_range))
+            buf.push_str(&format!(" {focus_range:?}"))
         }
         if let Some(container_name) = &self.container_name {
-            buf.push_str(&format!(" {}", container_name))
+            buf.push_str(&format!(" {container_name}"))
         }
         buf
     }
diff --git a/crates/ide/src/rename.rs b/crates/ide/src/rename.rs
index b4df043705..15bdf14fb9 100644
--- a/crates/ide/src/rename.rs
+++ b/crates/ide/src/rename.rs
@@ -345,7 +345,7 @@ mod tests {
         let (analysis, position) = fixture::position(ra_fixture_before);
         let rename_result = analysis
             .rename(position, new_name)
-            .unwrap_or_else(|err| panic!("Rename to '{}' was cancelled: {}", new_name, err));
+            .unwrap_or_else(|err| panic!("Rename to '{new_name}' was cancelled: {err}"));
         match rename_result {
             Ok(source_change) => {
                 let mut text_edit_builder = TextEdit::builder();
@@ -364,14 +364,11 @@ mod tests {
             }
             Err(err) => {
                 if ra_fixture_after.starts_with("error:") {
-                    let error_message = ra_fixture_after
-                        .chars()
-                        .into_iter()
-                        .skip("error:".len())
-                        .collect::<String>();
+                    let error_message =
+                        ra_fixture_after.chars().skip("error:".len()).collect::<String>();
                     assert_eq!(error_message.trim(), err.to_string());
                 } else {
-                    panic!("Rename to '{}' failed unexpectedly: {}", new_name, err)
+                    panic!("Rename to '{new_name}' failed unexpectedly: {err}")
                 }
             }
         };
@@ -397,11 +394,11 @@ mod tests {
         let (analysis, position) = fixture::position(ra_fixture);
         let result = analysis
             .prepare_rename(position)
-            .unwrap_or_else(|err| panic!("PrepareRename was cancelled: {}", err));
+            .unwrap_or_else(|err| panic!("PrepareRename was cancelled: {err}"));
         match result {
             Ok(RangeInfo { range, info: () }) => {
                 let source = analysis.file_text(position.file_id).unwrap();
-                expect.assert_eq(&format!("{:?}: {}", range, &source[range]))
+                expect.assert_eq(&format!("{range:?}: {}", &source[range]))
             }
             Err(RenameError(err)) => expect.assert_eq(&err),
         };
diff --git a/crates/ide/src/runnables.rs b/crates/ide/src/runnables.rs
index 0181c6b8e4..5b35262aab 100644
--- a/crates/ide/src/runnables.rs
+++ b/crates/ide/src/runnables.rs
@@ -66,12 +66,12 @@ impl Runnable {
     // test package::module::testname
     pub fn label(&self, target: Option<String>) -> String {
         match &self.kind {
-            RunnableKind::Test { test_id, .. } => format!("test {}", test_id),
-            RunnableKind::TestMod { path } => format!("test-mod {}", path),
-            RunnableKind::Bench { test_id } => format!("bench {}", test_id),
-            RunnableKind::DocTest { test_id, .. } => format!("doctest {}", test_id),
+            RunnableKind::Test { test_id, .. } => format!("test {test_id}"),
+            RunnableKind::TestMod { path } => format!("test-mod {path}"),
+            RunnableKind::Bench { test_id } => format!("bench {test_id}"),
+            RunnableKind::DocTest { test_id, .. } => format!("doctest {test_id}"),
             RunnableKind::Bin => {
-                target.map_or_else(|| "run binary".to_string(), |t| format!("run {}", t))
+                target.map_or_else(|| "run binary".to_string(), |t| format!("run {t}"))
             }
         }
     }
@@ -377,7 +377,7 @@ pub(crate) fn runnable_impl(
     } else {
         String::new()
     };
-    let mut test_id = format!("{}{}", adt_name, params);
+    let mut test_id = format!("{adt_name}{params}");
     test_id.retain(|c| c != ' ');
     let test_id = TestId::Path(test_id);
 
diff --git a/crates/ide/src/shuffle_crate_graph.rs b/crates/ide/src/shuffle_crate_graph.rs
index 2d86627643..ae539a5d39 100644
--- a/crates/ide/src/shuffle_crate_graph.rs
+++ b/crates/ide/src/shuffle_crate_graph.rs
@@ -36,6 +36,7 @@ pub(crate) fn shuffle_crate_graph(db: &mut RootDatabase) {
             data.proc_macro.clone(),
             data.is_proc_macro,
             data.origin.clone(),
+            data.target_layout.clone(),
         );
         map.insert(old_id, new_id);
     }
diff --git a/crates/ide/src/signature_help.rs b/crates/ide/src/signature_help.rs
index e7412d27fa..f807ba30f4 100644
--- a/crates/ide/src/signature_help.rs
+++ b/crates/ide/src/signature_help.rs
@@ -74,20 +74,28 @@ pub(crate) fn signature_help(db: &RootDatabase, position: FilePosition) -> Optio
                 ast::ArgList(arg_list) => {
                     let cursor_outside = arg_list.r_paren_token().as_ref() == Some(&token);
                     if cursor_outside {
-                        return None;
+                        continue;
                     }
-                    return signature_help_for_call(&sema, token);
+                    return signature_help_for_call(&sema, arg_list, token);
                 },
                 ast::GenericArgList(garg_list) => {
                     let cursor_outside = garg_list.r_angle_token().as_ref() == Some(&token);
                     if cursor_outside {
-                        return None;
+                        continue;
                     }
-                    return signature_help_for_generics(&sema, token);
+                    return signature_help_for_generics(&sema, garg_list, token);
                 },
                 _ => (),
             }
         }
+
+        // Stop at multi-line expressions, since the signature of the outer call is not very
+        // helpful inside them.
+        if let Some(expr) = ast::Expr::cast(node.clone()) {
+            if expr.syntax().text().contains_char('\n') {
+                return None;
+            }
+        }
     }
 
     None
@@ -95,10 +103,11 @@ pub(crate) fn signature_help(db: &RootDatabase, position: FilePosition) -> Optio
 
 fn signature_help_for_call(
     sema: &Semantics<'_, RootDatabase>,
+    arg_list: ast::ArgList,
     token: SyntaxToken,
 ) -> Option<SignatureHelp> {
     // Find the calling expression and its NameRef
-    let mut node = token.parent()?;
+    let mut node = arg_list.syntax().parent()?;
     let calling_node = loop {
         if let Some(callable) = ast::CallableExpr::cast(node.clone()) {
             if callable
@@ -109,14 +118,6 @@ fn signature_help_for_call(
             }
         }
 
-        // Stop at multi-line expressions, since the signature of the outer call is not very
-        // helpful inside them.
-        if let Some(expr) = ast::Expr::cast(node.clone()) {
-            if expr.syntax().text().contains_char('\n') {
-                return None;
-            }
-        }
-
         node = node.parent()?;
     };
 
@@ -200,10 +201,11 @@ fn signature_help_for_call(
 
 fn signature_help_for_generics(
     sema: &Semantics<'_, RootDatabase>,
+    garg_list: ast::GenericArgList,
     token: SyntaxToken,
 ) -> Option<SignatureHelp> {
-    let parent = token.parent()?;
-    let arg_list = parent
+    let arg_list = garg_list
+        .syntax()
         .ancestors()
         .filter_map(ast::GenericArgList::cast)
         .find(|list| list.syntax().text_range().contains(token.text_range().start()))?;
@@ -644,7 +646,7 @@ pub fn add_one(x: i32) -> i32 {
     x + 1
 }
 
-pub fn do() {
+pub fn r#do() {
     add_one($0
 }"#,
             expect![[r##"
@@ -770,6 +772,32 @@ fn f() {
 "#,
             expect![[]],
         );
+        check(
+            r#"
+fn foo(a: u8) -> u8 {a}
+fn bar(a: u8) -> u8 {a}
+fn f() {
+    foo(bar(123)$0)
+}
+"#,
+            expect![[r#"
+                fn foo(a: u8) -> u8
+                       ^^^^^
+            "#]],
+        );
+        check(
+            r#"
+struct Vec<T>(T);
+struct Vec2<T>(T);
+fn f() {
+    let _: Vec2<Vec<u8>$0>
+}
+"#,
+            expect![[r#"
+                struct Vec2<T>
+                            ^
+            "#]],
+        );
     }
 
     #[test]
diff --git a/crates/ide/src/static_index.rs b/crates/ide/src/static_index.rs
index 2380cf7381..a6b30ba139 100644
--- a/crates/ide/src/static_index.rs
+++ b/crates/ide/src/static_index.rs
@@ -13,6 +13,7 @@ use syntax::{AstNode, SyntaxKind::*, SyntaxToken, TextRange, T};
 
 use crate::{
     hover::hover_for_definition,
+    inlay_hints::AdjustmentHintsMode,
     moniker::{def_to_moniker, MonikerResult},
     parent_module::crates_for,
     Analysis, Fold, HoverConfig, HoverDocFormat, HoverResult, InlayHint, InlayHintsConfig,
@@ -106,13 +107,17 @@ impl StaticIndex<'_> {
             .analysis
             .inlay_hints(
                 &InlayHintsConfig {
+                    location_links: true,
                     render_colons: true,
+                    discriminant_hints: crate::DiscriminantHints::Fieldless,
                     type_hints: true,
                     parameter_hints: true,
                     chaining_hints: true,
                     closure_return_type_hints: crate::ClosureReturnTypeHints::WithBlock,
                     lifetime_elision_hints: crate::LifetimeElisionHints::Never,
                     adjustment_hints: crate::AdjustmentHints::Never,
+                    adjustment_hints_mode: AdjustmentHintsMode::Prefix,
+                    adjustment_hints_hide_outside_unsafe: false,
                     hide_named_constructor_hints: false,
                     hide_closure_initialization_hints: false,
                     param_names_for_lifetime_elision_hints: false,
@@ -231,13 +236,13 @@ mod tests {
             for (range, _) in f.tokens {
                 let x = FileRange { file_id: f.file_id, range };
                 if !range_set.contains(&x) {
-                    panic!("additional range {:?}", x);
+                    panic!("additional range {x:?}");
                 }
                 range_set.remove(&x);
             }
         }
         if !range_set.is_empty() {
-            panic!("unfound ranges {:?}", range_set);
+            panic!("unfound ranges {range_set:?}");
         }
     }
 
@@ -252,13 +257,13 @@ mod tests {
                     continue;
                 }
                 if !range_set.contains(&x) {
-                    panic!("additional definition {:?}", x);
+                    panic!("additional definition {x:?}");
                 }
                 range_set.remove(&x);
             }
         }
         if !range_set.is_empty() {
-            panic!("unfound definitions {:?}", range_set);
+            panic!("unfound definitions {range_set:?}");
         }
     }
 
diff --git a/crates/ide/src/status.rs b/crates/ide/src/status.rs
index 20810c25b3..7ce782f93b 100644
--- a/crates/ide/src/status.rs
+++ b/crates/ide/src/status.rs
@@ -52,8 +52,8 @@ pub(crate) fn status(db: &RootDatabase, file_id: Option<FileId>) -> String {
         let crate_graph = db.crate_graph();
         for krate in crates {
             let display_crate = |krate: CrateId| match &crate_graph[krate].display_name {
-                Some(it) => format!("{}({:?})", it, krate),
-                None => format!("{:?}", krate),
+                Some(it) => format!("{it}({krate:?})"),
+                None => format!("{krate:?}"),
             };
             format_to!(buf, "Crate: {}\n", display_crate(krate));
             let deps = crate_graph[krate]
diff --git a/crates/ide/src/syntax_highlighting/highlight.rs b/crates/ide/src/syntax_highlighting/highlight.rs
index e7d0a8be7f..892e6a9bb0 100644
--- a/crates/ide/src/syntax_highlighting/highlight.rs
+++ b/crates/ide/src/syntax_highlighting/highlight.rs
@@ -111,7 +111,7 @@ fn punctuation(
             let is_raw_ptr = (|| {
                 let prefix_expr = parent.and_then(ast::PrefixExpr::cast)?;
                 let expr = prefix_expr.expr()?;
-                sema.type_of_expr(&expr)?.original.is_raw_ptr().then(|| ())
+                sema.type_of_expr(&expr)?.original.is_raw_ptr().then_some(())
             })();
             if let Some(()) = is_raw_ptr {
                 HlTag::Operator(HlOperator::Other) | HlMod::Unsafe
@@ -174,6 +174,7 @@ fn keyword(
         | T![return]
         | T![while]
         | T![yield] => h | HlMod::ControlFlow,
+        T![do] | T![yeet] if parent_matches::<ast::YeetExpr>(&token) => h | HlMod::ControlFlow,
         T![for] if parent_matches::<ast::ForExpr>(&token) => h | HlMod::ControlFlow,
         T![unsafe] => h | HlMod::Unsafe,
         T![true] | T![false] => HlTag::BoolLiteral.into(),
diff --git a/crates/ide/src/syntax_highlighting/html.rs b/crates/ide/src/syntax_highlighting/html.rs
index e91fd7f125..2c7823069b 100644
--- a/crates/ide/src/syntax_highlighting/html.rs
+++ b/crates/ide/src/syntax_highlighting/html.rs
@@ -52,7 +52,7 @@ pub(crate) fn highlight_as_html(db: &RootDatabase, file_id: FileId, rainbow: boo
         let class = r.highlight.to_string().replace('.', " ");
         let color = match (rainbow, r.binding_hash) {
             (true, Some(hash)) => {
-                format!(" data-binding-hash=\"{}\" style=\"color: {};\"", hash, rainbowify(hash))
+                format!(" data-binding-hash=\"{hash}\" style=\"color: {};\"", rainbowify(hash))
             }
             _ => "".into(),
         };
diff --git a/crates/ide/src/syntax_highlighting/tests.rs b/crates/ide/src/syntax_highlighting/tests.rs
index 46cc667fc4..2f870d769c 100644
--- a/crates/ide/src/syntax_highlighting/tests.rs
+++ b/crates/ide/src/syntax_highlighting/tests.rs
@@ -1028,6 +1028,26 @@ macro_rules! test {}
     let _ = analysis.highlight(HL_CONFIG, file_id).unwrap();
 }
 
+#[test]
+fn highlight_callable_no_crash() {
+    // regression test for #13838.
+    let (analysis, file_id) = fixture::file(
+        r#"
+//- minicore: fn, sized
+impl<A, F: ?Sized> FnOnce<A> for &F
+where
+    F: Fn<A>,
+{
+    type Output = F::Output;
+}
+
+trait Trait {}
+fn foo(x: &fn(&dyn Trait)) {}
+"#,
+    );
+    let _ = analysis.highlight(HL_CONFIG, file_id).unwrap();
+}
+
 /// Highlights the code given by the `ra_fixture` argument, renders the
 /// result as HTML, and compares it with the HTML file given as `snapshot`.
 /// Note that the `snapshot` file is overwritten by the rendered HTML.
diff --git a/crates/ide/src/syntax_tree.rs b/crates/ide/src/syntax_tree.rs
index 4256fea0f8..bb6827e8a4 100644
--- a/crates/ide/src/syntax_tree.rs
+++ b/crates/ide/src/syntax_tree.rs
@@ -32,7 +32,7 @@ pub(crate) fn syntax_tree(
             }
         };
 
-        format!("{:#?}", node)
+        format!("{node:#?}")
     } else {
         format!("{:#?}", parse.tree().syntax())
     }
diff --git a/crates/ide/src/typing.rs b/crates/ide/src/typing.rs
index 9118f3c699..eba5a48563 100644
--- a/crates/ide/src/typing.rs
+++ b/crates/ide/src/typing.rs
@@ -397,7 +397,7 @@ mod tests {
 
     fn type_char(char_typed: char, ra_fixture_before: &str, ra_fixture_after: &str) {
         let actual = do_type_char(char_typed, ra_fixture_before)
-            .unwrap_or_else(|| panic!("typing `{}` did nothing", char_typed));
+            .unwrap_or_else(|| panic!("typing `{char_typed}` did nothing"));
 
         assert_eq_text!(ra_fixture_after, &actual);
     }
diff --git a/crates/ide/src/typing/on_enter.rs b/crates/ide/src/typing/on_enter.rs
index 48c1713270..298482f2ab 100644
--- a/crates/ide/src/typing/on_enter.rs
+++ b/crates/ide/src/typing/on_enter.rs
@@ -108,7 +108,7 @@ fn on_enter_in_comment(
     }
 
     let indent = node_indent(file, comment.syntax())?;
-    let inserted = format!("\n{}{} $0", indent, prefix);
+    let inserted = format!("\n{indent}{prefix} $0");
     let delete = if remove_trailing_whitespace {
         let trimmed_len = comment.text().trim_end().len() as u32;
         let trailing_whitespace_len = comment.text().len() as u32 - trimmed_len;
@@ -129,7 +129,7 @@ fn on_enter_in_block(block: ast::BlockExpr, position: FilePosition) -> Option<Te
 
     let indent = IndentLevel::from_node(block.syntax());
     let mut edit = TextEdit::insert(position.offset, format!("\n{}$0", indent + 1));
-    edit.union(TextEdit::insert(contents.text_range().end(), format!("\n{}", indent))).ok()?;
+    edit.union(TextEdit::insert(contents.text_range().end(), format!("\n{indent}"))).ok()?;
     Some(edit)
 }
 
@@ -140,11 +140,8 @@ fn on_enter_in_use_tree_list(list: ast::UseTreeList, position: FilePosition) ->
 
     let indent = IndentLevel::from_node(list.syntax());
     let mut edit = TextEdit::insert(position.offset, format!("\n{}$0", indent + 1));
-    edit.union(TextEdit::insert(
-        list.r_curly_token()?.text_range().start(),
-        format!("\n{}", indent),
-    ))
-    .ok()?;
+    edit.union(TextEdit::insert(list.r_curly_token()?.text_range().start(), format!("\n{indent}")))
+        .ok()?;
     Some(edit)
 }
 
diff --git a/crates/limit/src/lib.rs b/crates/limit/src/lib.rs
index d6a706a7cd..6b2534aa46 100644
--- a/crates/limit/src/lib.rs
+++ b/crates/limit/src/lib.rs
@@ -59,7 +59,7 @@ impl Limit {
                     .compare_exchange_weak(old_max, other, Ordering::Relaxed, Ordering::Relaxed)
                     .is_ok()
                 {
-                    eprintln!("new max: {}", other);
+                    eprintln!("new max: {other}");
                 }
             }
 
diff --git a/crates/mbe/src/benchmark.rs b/crates/mbe/src/benchmark.rs
index 9c92bae6a1..4b75002501 100644
--- a/crates/mbe/src/benchmark.rs
+++ b/crates/mbe/src/benchmark.rs
@@ -101,7 +101,7 @@ fn invocation_fixtures(rules: &FxHashMap<String, DeclarativeMacro>) -> Vec<(Stri
                     }
                     try_cnt += 1;
                     if try_cnt > 100 {
-                        panic!("invocaton fixture {} cannot be generated.\n", name);
+                        panic!("invocaton fixture {name} cannot be generated.\n");
                     }
                 }
             }
@@ -139,9 +139,15 @@ fn invocation_fixtures(rules: &FxHashMap<String, DeclarativeMacro>) -> Vec<(Stri
                 }
 
                 None => (),
-                Some(kind) => panic!("Unhandled kind {:?}", kind),
+                Some(kind) => panic!("Unhandled kind {kind:?}"),
             },
-            Op::Leaf(leaf) => parent.token_trees.push(leaf.clone().into()),
+            Op::Literal(it) => parent.token_trees.push(tt::Leaf::from(it.clone()).into()),
+            Op::Ident(it) => parent.token_trees.push(tt::Leaf::from(it.clone()).into()),
+            Op::Punct(puncts) => {
+                for punct in puncts {
+                    parent.token_trees.push(tt::Leaf::from(punct.clone()).into());
+                }
+            }
             Op::Repeat { tokens, kind, separator } => {
                 let max = 10;
                 let cnt = match kind {
diff --git a/crates/mbe/src/expander/matcher.rs b/crates/mbe/src/expander/matcher.rs
index 3f656df25f..88eae136f7 100644
--- a/crates/mbe/src/expander/matcher.rs
+++ b/crates/mbe/src/expander/matcher.rs
@@ -68,7 +68,7 @@ use crate::{
     expander::{Binding, Bindings, ExpandResult, Fragment},
     parser::{MetaVarKind, Op, RepeatKind, Separator},
     tt_iter::TtIter,
-    ExpandError, MetaTemplate,
+    ExpandError, MetaTemplate, ValueResult,
 };
 
 impl Bindings {
@@ -321,8 +321,8 @@ struct MatchState<'t> {
     /// The KleeneOp of this sequence if we are in a repetition.
     sep_kind: Option<RepeatKind>,
 
-    /// Number of tokens of separator parsed
-    sep_parsed: Option<usize>,
+    /// Whether we already matched separator token.
+    sep_matched: bool,
 
     /// Matched meta variables bindings
     bindings: BindingsIdx,
@@ -387,7 +387,7 @@ fn match_loop_inner<'t>(
             None => {
                 // We are at or past the end of the matcher of `item`.
                 if let Some(up) = &item.up {
-                    if item.sep_parsed.is_none() {
+                    if !item.sep_matched {
                         // Get the `up` matcher
                         let mut new_pos = (**up).clone();
                         new_pos.bindings = bindings_builder.copy(&new_pos.bindings);
@@ -401,14 +401,17 @@ fn match_loop_inner<'t>(
                     }
 
                     // Check if we need a separator.
-                    // We check the separator one by one
-                    let sep_idx = item.sep_parsed.unwrap_or(0);
-                    let sep_len = item.sep.as_ref().map_or(0, Separator::tt_count);
-                    if item.sep.is_some() && sep_idx != sep_len {
+                    if item.sep.is_some() && !item.sep_matched {
                         let sep = item.sep.as_ref().unwrap();
-                        if src.clone().expect_separator(sep, sep_idx) {
+                        let mut fork = src.clone();
+                        if fork.expect_separator(sep) {
+                            // HACK: here we use `meta_result` to pass `TtIter` back to caller because
+                            // it might have been advanced multiple times. `ValueResult` is
+                            // insignificant.
+                            item.meta_result = Some((fork, ValueResult::ok(None)));
                             item.dot.next();
-                            item.sep_parsed = Some(sep_idx + 1);
+                            // item.sep_parsed = Some(sep_len);
+                            item.sep_matched = true;
                             try_push!(next_items, item);
                         }
                     }
@@ -416,7 +419,7 @@ fn match_loop_inner<'t>(
                     // and try to match again UNLESS we are only allowed to have _one_ repetition.
                     else if item.sep_kind != Some(RepeatKind::ZeroOrOne) {
                         item.dot = item.dot.reset();
-                        item.sep_parsed = None;
+                        item.sep_matched = false;
                         bindings_builder.push_default(&mut item.bindings);
                         cur_items.push(item);
                     }
@@ -451,7 +454,7 @@ fn match_loop_inner<'t>(
                     up: Some(Box::new(item)),
                     sep: separator.clone(),
                     sep_kind: Some(*kind),
-                    sep_parsed: None,
+                    sep_matched: false,
                     bindings: bindings_builder.alloc(),
                     meta_result: None,
                     is_error: false,
@@ -500,18 +503,69 @@ fn match_loop_inner<'t>(
                     }
                 }
             }
-            OpDelimited::Op(Op::Leaf(leaf)) => {
-                if let Err(err) = match_leaf(leaf, &mut src.clone()) {
-                    res.add_err(err);
-                    item.is_error = true;
+            OpDelimited::Op(Op::Literal(lhs)) => {
+                if let Ok(rhs) = src.clone().expect_leaf() {
+                    if matches!(rhs, tt::Leaf::Literal(it) if it.text == lhs.text) {
+                        item.dot.next();
+                    } else {
+                        res.add_err(ExpandError::UnexpectedToken);
+                        item.is_error = true;
+                    }
                 } else {
-                    item.dot.next();
+                    res.add_err(ExpandError::binding_error(format!("expected literal: `{lhs}`")));
+                    item.is_error = true;
                 }
                 try_push!(next_items, item);
             }
+            OpDelimited::Op(Op::Ident(lhs)) => {
+                if let Ok(rhs) = src.clone().expect_leaf() {
+                    if matches!(rhs, tt::Leaf::Ident(it) if it.text == lhs.text) {
+                        item.dot.next();
+                    } else {
+                        res.add_err(ExpandError::UnexpectedToken);
+                        item.is_error = true;
+                    }
+                } else {
+                    res.add_err(ExpandError::binding_error(format!("expected ident: `{lhs}`")));
+                    item.is_error = true;
+                }
+                try_push!(next_items, item);
+            }
+            OpDelimited::Op(Op::Punct(lhs)) => {
+                let mut fork = src.clone();
+                let error = if let Ok(rhs) = fork.expect_glued_punct() {
+                    let first_is_single_quote = rhs[0].char == '\'';
+                    let lhs = lhs.iter().map(|it| it.char);
+                    let rhs = rhs.iter().map(|it| it.char);
+                    if lhs.clone().eq(rhs) {
+                        // HACK: here we use `meta_result` to pass `TtIter` back to caller because
+                        // it might have been advanced multiple times. `ValueResult` is
+                        // insignificant.
+                        item.meta_result = Some((fork, ValueResult::ok(None)));
+                        item.dot.next();
+                        next_items.push(item);
+                        continue;
+                    }
+
+                    if first_is_single_quote {
+                        // If the first punct token is a single quote, that's a part of a lifetime
+                        // ident, not a punct.
+                        ExpandError::UnexpectedToken
+                    } else {
+                        let lhs: SmolStr = lhs.collect();
+                        ExpandError::binding_error(format!("expected punct: `{lhs}`"))
+                    }
+                } else {
+                    ExpandError::UnexpectedToken
+                };
+
+                res.add_err(error);
+                item.is_error = true;
+                error_items.push(item);
+            }
             OpDelimited::Op(Op::Ignore { .. } | Op::Index { .. }) => {}
             OpDelimited::Open => {
-                if matches!(src.clone().next(), Some(tt::TokenTree::Subtree(..))) {
+                if matches!(src.peek_n(0), Some(tt::TokenTree::Subtree(..))) {
                     item.dot.next();
                     try_push!(next_items, item);
                 }
@@ -541,7 +595,7 @@ fn match_loop(pattern: &MetaTemplate, src: &tt::Subtree) -> Match {
         up: None,
         sep: None,
         sep_kind: None,
-        sep_parsed: None,
+        sep_matched: false,
         bindings: bindings_builder.alloc(),
         is_error: false,
         meta_result: None,
@@ -616,21 +670,33 @@ fn match_loop(pattern: &MetaTemplate, src: &tt::Subtree) -> Match {
         }
         // Dump all possible `next_items` into `cur_items` for the next iteration.
         else if !next_items.is_empty() {
+            if let Some((iter, _)) = next_items[0].meta_result.take() {
+                // We've matched a possibly "glued" punct. The matched punct (hence
+                // `meta_result` also) must be the same for all items.
+                // FIXME: If there are multiple items, it's definitely redundant (and it's hacky!
+                // `meta_result` isn't supposed to be used this way).
+
+                // We already bumped, so no need to call `.next()` like in the other branch.
+                src = iter;
+                for item in next_items.iter_mut() {
+                    item.meta_result = None;
+                }
+            } else {
+                match src.next() {
+                    Some(tt::TokenTree::Subtree(subtree)) => {
+                        stack.push(src.clone());
+                        src = TtIter::new(subtree);
+                    }
+                    None => {
+                        if let Some(iter) = stack.pop() {
+                            src = iter;
+                        }
+                    }
+                    _ => (),
+                }
+            }
             // Now process the next token
             cur_items.extend(next_items.drain(..));
-
-            match src.next() {
-                Some(tt::TokenTree::Subtree(subtree)) => {
-                    stack.push(src.clone());
-                    src = TtIter::new(subtree);
-                }
-                None => {
-                    if let Some(iter) = stack.pop() {
-                        src = iter;
-                    }
-                }
-                _ => (),
-            }
         }
         // Finally, we have the case where we need to call the black-box parser to get some
         // nonterminal.
@@ -663,27 +729,6 @@ fn match_loop(pattern: &MetaTemplate, src: &tt::Subtree) -> Match {
     }
 }
 
-fn match_leaf(lhs: &tt::Leaf, src: &mut TtIter<'_>) -> Result<(), ExpandError> {
-    let rhs = src
-        .expect_leaf()
-        .map_err(|()| ExpandError::binding_error(format!("expected leaf: `{lhs}`")))?;
-    match (lhs, rhs) {
-        (
-            tt::Leaf::Punct(tt::Punct { char: lhs, .. }),
-            tt::Leaf::Punct(tt::Punct { char: rhs, .. }),
-        ) if lhs == rhs => Ok(()),
-        (
-            tt::Leaf::Ident(tt::Ident { text: lhs, .. }),
-            tt::Leaf::Ident(tt::Ident { text: rhs, .. }),
-        ) if lhs == rhs => Ok(()),
-        (
-            tt::Leaf::Literal(tt::Literal { text: lhs, .. }),
-            tt::Leaf::Literal(tt::Literal { text: rhs, .. }),
-        ) if lhs == rhs => Ok(()),
-        _ => Err(ExpandError::UnexpectedToken),
-    }
-}
-
 fn match_meta_var(kind: MetaVarKind, input: &mut TtIter<'_>) -> ExpandResult<Option<Fragment>> {
     let fragment = match kind {
         MetaVarKind::Path => parser::PrefixEntryPoint::Path,
@@ -698,12 +743,16 @@ fn match_meta_var(kind: MetaVarKind, input: &mut TtIter<'_>) -> ExpandResult<Opt
         MetaVarKind::Item => parser::PrefixEntryPoint::Item,
         MetaVarKind::Vis => parser::PrefixEntryPoint::Vis,
         MetaVarKind::Expr => {
-            // `expr` should not match underscores.
+            // `expr` should not match underscores, let expressions, or inline const. The latter
+            // two are for [backwards compatibility][0].
             // HACK: Macro expansion should not be done using "rollback and try another alternative".
-            // rustc [explicitly checks the next token][0].
-            // [0]: https://github.com/rust-lang/rust/blob/f0c4da499/compiler/rustc_expand/src/mbe/macro_parser.rs#L576
+            // rustc [explicitly checks the next token][1].
+            // [0]: https://github.com/rust-lang/rust/issues/86730
+            // [1]: https://github.com/rust-lang/rust/blob/f0c4da499/compiler/rustc_expand/src/mbe/macro_parser.rs#L576
             match input.peek_n(0) {
-                Some(tt::TokenTree::Leaf(tt::Leaf::Ident(it))) if it.text == "_" => {
+                Some(tt::TokenTree::Leaf(tt::Leaf::Ident(it)))
+                    if it.text == "_" || it.text == "let" || it.text == "const" =>
+                {
                     return ExpandResult::only_err(ExpandError::NoMatchingRule)
                 }
                 _ => {}
@@ -752,10 +801,10 @@ fn collect_vars(collector_fun: &mut impl FnMut(SmolStr), pattern: &MetaTemplate)
     for op in pattern.iter() {
         match op {
             Op::Var { name, .. } => collector_fun(name.clone()),
-            Op::Leaf(_) => (),
             Op::Subtree { tokens, .. } => collect_vars(collector_fun, tokens),
             Op::Repeat { tokens, .. } => collect_vars(collector_fun, tokens),
-            Op::Ignore { .. } | Op::Index { .. } => {}
+            Op::Ignore { .. } | Op::Index { .. } | Op::Literal(_) | Op::Ident(_) | Op::Punct(_) => {
+            }
         }
     }
 }
@@ -818,14 +867,14 @@ impl<'a> Iterator for OpDelimitedIter<'a> {
 }
 
 impl<'a> TtIter<'a> {
-    fn expect_separator(&mut self, separator: &Separator, idx: usize) -> bool {
+    fn expect_separator(&mut self, separator: &Separator) -> bool {
         let mut fork = self.clone();
         let ok = match separator {
-            Separator::Ident(lhs) if idx == 0 => match fork.expect_ident_or_underscore() {
+            Separator::Ident(lhs) => match fork.expect_ident_or_underscore() {
                 Ok(rhs) => rhs.text == lhs.text,
                 Err(_) => false,
             },
-            Separator::Literal(lhs) if idx == 0 => match fork.expect_literal() {
+            Separator::Literal(lhs) => match fork.expect_literal() {
                 Ok(rhs) => match rhs {
                     tt::Leaf::Literal(rhs) => rhs.text == lhs.text,
                     tt::Leaf::Ident(rhs) => rhs.text == lhs.text,
@@ -833,11 +882,14 @@ impl<'a> TtIter<'a> {
                 },
                 Err(_) => false,
             },
-            Separator::Puncts(lhss) if idx < lhss.len() => match fork.expect_punct() {
-                Ok(rhs) => rhs.char == lhss[idx].char,
+            Separator::Puncts(lhs) => match fork.expect_glued_punct() {
+                Ok(rhs) => {
+                    let lhs = lhs.iter().map(|it| it.char);
+                    let rhs = rhs.iter().map(|it| it.char);
+                    lhs.eq(rhs)
+                }
                 Err(_) => false,
             },
-            _ => false,
         };
         if ok {
             *self = fork;
@@ -846,52 +898,21 @@ impl<'a> TtIter<'a> {
     }
 
     fn expect_tt(&mut self) -> Result<tt::TokenTree, ()> {
-        match self.peek_n(0) {
-            Some(tt::TokenTree::Leaf(tt::Leaf::Punct(punct))) if punct.char == '\'' => {
-                return self.expect_lifetime();
+        if let Some(tt::TokenTree::Leaf(tt::Leaf::Punct(punct))) = self.peek_n(0) {
+            if punct.char == '\'' {
+                self.expect_lifetime()
+            } else {
+                let puncts = self.expect_glued_punct()?;
+                let token_trees = puncts.into_iter().map(|p| tt::Leaf::Punct(p).into()).collect();
+                Ok(tt::TokenTree::Subtree(tt::Subtree { delimiter: None, token_trees }))
             }
-            _ => (),
-        }
-
-        let tt = self.next().ok_or(())?.clone();
-        let punct = match tt {
-            tt::TokenTree::Leaf(tt::Leaf::Punct(punct)) if punct.spacing == tt::Spacing::Joint => {
-                punct
-            }
-            _ => return Ok(tt),
-        };
-
-        let (second, third) = match (self.peek_n(0), self.peek_n(1)) {
-            (
-                Some(tt::TokenTree::Leaf(tt::Leaf::Punct(p2))),
-                Some(tt::TokenTree::Leaf(tt::Leaf::Punct(p3))),
-            ) if p2.spacing == tt::Spacing::Joint => (p2.char, Some(p3.char)),
-            (Some(tt::TokenTree::Leaf(tt::Leaf::Punct(p2))), _) => (p2.char, None),
-            _ => return Ok(tt),
-        };
-
-        match (punct.char, second, third) {
-            ('.', '.', Some('.' | '=')) | ('<', '<', Some('=')) | ('>', '>', Some('=')) => {
-                let tt2 = self.next().unwrap().clone();
-                let tt3 = self.next().unwrap().clone();
-                Ok(tt::Subtree { delimiter: None, token_trees: vec![tt, tt2, tt3] }.into())
-            }
-            ('-' | '!' | '*' | '/' | '&' | '%' | '^' | '+' | '<' | '=' | '>' | '|', '=', _)
-            | ('-' | '=' | '>', '>', _)
-            | (':', ':', _)
-            | ('.', '.', _)
-            | ('&', '&', _)
-            | ('<', '<', _)
-            | ('|', '|', _) => {
-                let tt2 = self.next().unwrap().clone();
-                Ok(tt::Subtree { delimiter: None, token_trees: vec![tt, tt2] }.into())
-            }
-            _ => Ok(tt),
+        } else {
+            self.next().ok_or(()).cloned()
         }
     }
 
     fn expect_lifetime(&mut self) -> Result<tt::TokenTree, ()> {
-        let punct = self.expect_punct()?;
+        let punct = self.expect_single_punct()?;
         if punct.char != '\'' {
             return Err(());
         }
diff --git a/crates/mbe/src/expander/transcriber.rs b/crates/mbe/src/expander/transcriber.rs
index cbb59ab8e6..db0d327bf4 100644
--- a/crates/mbe/src/expander/transcriber.rs
+++ b/crates/mbe/src/expander/transcriber.rs
@@ -134,7 +134,13 @@ fn expand_subtree(
     let mut err = None;
     for op in template.iter() {
         match op {
-            Op::Leaf(tt) => arena.push(tt.clone().into()),
+            Op::Literal(it) => arena.push(tt::Leaf::from(it.clone()).into()),
+            Op::Ident(it) => arena.push(tt::Leaf::from(it.clone()).into()),
+            Op::Punct(puncts) => {
+                for punct in puncts {
+                    arena.push(tt::Leaf::from(punct.clone()).into());
+                }
+            }
             Op::Subtree { tokens, delimiter } => {
                 let ExpandResult { value: tt, err: e } =
                     expand_subtree(ctx, tokens, *delimiter, arena);
diff --git a/crates/mbe/src/lib.rs b/crates/mbe/src/lib.rs
index c4f0fa20d6..2373db97a3 100644
--- a/crates/mbe/src/lib.rs
+++ b/crates/mbe/src/lib.rs
@@ -140,7 +140,7 @@ impl Shift {
                     | tt::Leaf::Punct(tt::Punct { id, .. })
                     | tt::Leaf::Literal(tt::Literal { id, .. })) = leaf;
 
-                    (id != tt::TokenId::unspecified()).then(|| id.0)
+                    (id != tt::TokenId::unspecified()).then_some(id.0)
                 }
             };
             subtree.token_trees.iter().filter_map(filter).max()
diff --git a/crates/mbe/src/parser.rs b/crates/mbe/src/parser.rs
index 351c359b73..fad905e97f 100644
--- a/crates/mbe/src/parser.rs
+++ b/crates/mbe/src/parser.rs
@@ -1,7 +1,7 @@
 //! Parser recognizes special macro syntax, `$var` and `$(repeat)*`, in token
 //! trees.
 
-use smallvec::SmallVec;
+use smallvec::{smallvec, SmallVec};
 use syntax::SmolStr;
 
 use crate::{tt_iter::TtIter, ParseError};
@@ -39,7 +39,7 @@ impl MetaTemplate {
         let mut src = TtIter::new(tt);
 
         let mut res = Vec::new();
-        while let Some(first) = src.next() {
+        while let Some(first) = src.peek_n(0) {
             let op = next_op(first, &mut src, mode)?;
             res.push(op);
         }
@@ -54,8 +54,10 @@ pub(crate) enum Op {
     Ignore { name: SmolStr, id: tt::TokenId },
     Index { depth: u32 },
     Repeat { tokens: MetaTemplate, kind: RepeatKind, separator: Option<Separator> },
-    Leaf(tt::Leaf),
     Subtree { tokens: MetaTemplate, delimiter: Option<tt::Delimiter> },
+    Literal(tt::Literal),
+    Punct(SmallVec<[tt::Punct; 3]>),
+    Ident(tt::Ident),
 }
 
 #[derive(Copy, Clone, Debug, PartialEq, Eq)]
@@ -108,28 +110,23 @@ impl PartialEq for Separator {
     }
 }
 
-impl Separator {
-    pub(crate) fn tt_count(&self) -> usize {
-        match self {
-            Separator::Literal(_) => 1,
-            Separator::Ident(_) => 1,
-            Separator::Puncts(it) => it.len(),
-        }
-    }
-}
-
 #[derive(Clone, Copy)]
 enum Mode {
     Pattern,
     Template,
 }
 
-fn next_op<'a>(first: &tt::TokenTree, src: &mut TtIter<'a>, mode: Mode) -> Result<Op, ParseError> {
-    let res = match first {
-        tt::TokenTree::Leaf(leaf @ tt::Leaf::Punct(tt::Punct { char: '$', .. })) => {
+fn next_op(
+    first_peeked: &tt::TokenTree,
+    src: &mut TtIter<'_>,
+    mode: Mode,
+) -> Result<Op, ParseError> {
+    let res = match first_peeked {
+        tt::TokenTree::Leaf(tt::Leaf::Punct(p @ tt::Punct { char: '$', .. })) => {
+            src.next().expect("first token already peeked");
             // Note that the '$' itself is a valid token inside macro_rules.
             let second = match src.next() {
-                None => return Ok(Op::Leaf(leaf.clone())),
+                None => return Ok(Op::Punct(smallvec![p.clone()])),
                 Some(it) => it,
             };
             match second {
@@ -160,7 +157,7 @@ fn next_op<'a>(first: &tt::TokenTree, src: &mut TtIter<'a>, mode: Mode) -> Resul
                 tt::TokenTree::Leaf(leaf) => match leaf {
                     tt::Leaf::Ident(ident) if ident.text == "crate" => {
                         // We simply produce identifier `$crate` here. And it will be resolved when lowering ast to Path.
-                        Op::Leaf(tt::Leaf::from(tt::Ident { text: "$crate".into(), id: ident.id }))
+                        Op::Ident(tt::Ident { text: "$crate".into(), id: ident.id })
                     }
                     tt::Leaf::Ident(ident) => {
                         let kind = eat_fragment_kind(src, mode)?;
@@ -180,7 +177,7 @@ fn next_op<'a>(first: &tt::TokenTree, src: &mut TtIter<'a>, mode: Mode) -> Resul
                                 "`$$` is not allowed on the pattern side",
                             ))
                         }
-                        Mode::Template => Op::Leaf(tt::Leaf::Punct(*punct)),
+                        Mode::Template => Op::Punct(smallvec![*punct]),
                     },
                     tt::Leaf::Punct(_) | tt::Leaf::Literal(_) => {
                         return Err(ParseError::expected("expected ident"))
@@ -188,8 +185,25 @@ fn next_op<'a>(first: &tt::TokenTree, src: &mut TtIter<'a>, mode: Mode) -> Resul
                 },
             }
         }
-        tt::TokenTree::Leaf(tt) => Op::Leaf(tt.clone()),
+
+        tt::TokenTree::Leaf(tt::Leaf::Literal(it)) => {
+            src.next().expect("first token already peeked");
+            Op::Literal(it.clone())
+        }
+
+        tt::TokenTree::Leaf(tt::Leaf::Ident(it)) => {
+            src.next().expect("first token already peeked");
+            Op::Ident(it.clone())
+        }
+
+        tt::TokenTree::Leaf(tt::Leaf::Punct(_)) => {
+            // There's at least one punct so this shouldn't fail.
+            let puncts = src.expect_glued_punct().unwrap();
+            Op::Punct(puncts)
+        }
+
         tt::TokenTree::Subtree(subtree) => {
+            src.next().expect("first token already peeked");
             let tokens = MetaTemplate::parse(subtree, mode)?;
             Op::Subtree { tokens, delimiter: subtree.delimiter }
         }
@@ -259,7 +273,7 @@ fn parse_repeat(src: &mut TtIter<'_>) -> Result<(Option<Separator>, RepeatKind),
                         _ => return Err(ParseError::InvalidRepeat),
                     },
                 };
-                return Ok((has_sep.then(|| separator), repeat_kind));
+                return Ok((has_sep.then_some(separator), repeat_kind));
             }
         }
     }
diff --git a/crates/mbe/src/syntax_bridge.rs b/crates/mbe/src/syntax_bridge.rs
index cf53c16726..5c96505563 100644
--- a/crates/mbe/src/syntax_bridge.rs
+++ b/crates/mbe/src/syntax_bridge.rs
@@ -145,7 +145,7 @@ pub fn parse_exprs_with_sep(tt: &tt::Subtree, sep: char) -> Vec<tt::Subtree> {
     }
 
     if iter.peek_n(0).is_some() {
-        res.push(tt::Subtree { delimiter: None, token_trees: iter.into_iter().cloned().collect() });
+        res.push(tt::Subtree { delimiter: None, token_trees: iter.cloned().collect() });
     }
 
     res
@@ -237,7 +237,7 @@ fn convert_tokens<C: TokenConverter>(conv: &mut C) -> tt::Subtree {
             let char = match token.to_char(conv) {
                 Some(c) => c,
                 None => {
-                    panic!("Token from lexer must be single char: token = {:#?}", token);
+                    panic!("Token from lexer must be single char: token = {token:#?}");
                 }
             };
             tt::Leaf::from(tt::Punct { char, spacing, id: conv.id_alloc().alloc(range, synth_id) })
diff --git a/crates/mbe/src/syntax_bridge/tests.rs b/crates/mbe/src/syntax_bridge/tests.rs
index 4e04d2bc1c..c1a6083655 100644
--- a/crates/mbe/src/syntax_bridge/tests.rs
+++ b/crates/mbe/src/syntax_bridge/tests.rs
@@ -19,7 +19,7 @@ fn check_punct_spacing(fixture: &str) {
             let spacing = match annotation.as_str() {
                 "Alone" => Spacing::Alone,
                 "Joint" => Spacing::Joint,
-                a => panic!("unknown annotation: {}", a),
+                a => panic!("unknown annotation: {a}"),
             };
             (token, spacing)
         })
@@ -30,7 +30,7 @@ fn check_punct_spacing(fixture: &str) {
     while !cursor.eof() {
         while let Some(token_tree) = cursor.token_tree() {
             if let TokenTreeRef::Leaf(Leaf::Punct(Punct { spacing, id, .. }), _) = token_tree {
-                if let Some(expected) = annotations.remove(&id) {
+                if let Some(expected) = annotations.remove(id) {
                     assert_eq!(expected, *spacing);
                 }
             }
@@ -39,7 +39,7 @@ fn check_punct_spacing(fixture: &str) {
         cursor = cursor.bump();
     }
 
-    assert!(annotations.is_empty(), "unchecked annotations: {:?}", annotations);
+    assert!(annotations.is_empty(), "unchecked annotations: {annotations:?}");
 }
 
 #[test]
diff --git a/crates/mbe/src/to_parser_input.rs b/crates/mbe/src/to_parser_input.rs
index 783c3ca4a8..7013aa58b5 100644
--- a/crates/mbe/src/to_parser_input.rs
+++ b/crates/mbe/src/to_parser_input.rs
@@ -60,7 +60,7 @@ pub(crate) fn to_parser_input(buffer: &TokenBuffer<'_>) -> parser::Input {
                     },
                     tt::Leaf::Punct(punct) => {
                         let kind = SyntaxKind::from_char(punct.char)
-                            .unwrap_or_else(|| panic!("{:#?} is not a valid punct", punct));
+                            .unwrap_or_else(|| panic!("{punct:#?} is not a valid punct"));
                         res.push(kind);
                         if punct.spacing == tt::Spacing::Joint {
                             res.was_joint();
diff --git a/crates/mbe/src/tt_iter.rs b/crates/mbe/src/tt_iter.rs
index 7aceb676c7..bee7b5de6a 100644
--- a/crates/mbe/src/tt_iter.rs
+++ b/crates/mbe/src/tt_iter.rs
@@ -1,6 +1,7 @@
 //! A "Parser" structure for token trees. We use this when parsing a declarative
 //! macro definition into a list of patterns and templates.
 
+use smallvec::{smallvec, SmallVec};
 use syntax::SyntaxKind;
 use tt::buffer::TokenBuffer;
 
@@ -80,13 +81,56 @@ impl<'a> TtIter<'a> {
         }
     }
 
-    pub(crate) fn expect_punct(&mut self) -> Result<&'a tt::Punct, ()> {
+    pub(crate) fn expect_single_punct(&mut self) -> Result<&'a tt::Punct, ()> {
         match self.expect_leaf()? {
             tt::Leaf::Punct(it) => Ok(it),
             _ => Err(()),
         }
     }
 
+    /// Returns consecutive `Punct`s that can be glued together.
+    ///
+    /// This method currently may return a single quotation, which is part of lifetime ident and
+    /// conceptually not a punct in the context of mbe. Callers should handle this.
+    pub(crate) fn expect_glued_punct(&mut self) -> Result<SmallVec<[tt::Punct; 3]>, ()> {
+        let tt::TokenTree::Leaf(tt::Leaf::Punct(first)) = self.next().ok_or(())?.clone() else {
+            return Err(());
+        };
+
+        if first.spacing == tt::Spacing::Alone {
+            return Ok(smallvec![first]);
+        }
+
+        let (second, third) = match (self.peek_n(0), self.peek_n(1)) {
+            (
+                Some(tt::TokenTree::Leaf(tt::Leaf::Punct(p2))),
+                Some(tt::TokenTree::Leaf(tt::Leaf::Punct(p3))),
+            ) if p2.spacing == tt::Spacing::Joint => (p2, Some(p3)),
+            (Some(tt::TokenTree::Leaf(tt::Leaf::Punct(p2))), _) => (p2, None),
+            _ => return Ok(smallvec![first]),
+        };
+
+        match (first.char, second.char, third.map(|it| it.char)) {
+            ('.', '.', Some('.' | '=')) | ('<', '<', Some('=')) | ('>', '>', Some('=')) => {
+                let _ = self.next().unwrap();
+                let _ = self.next().unwrap();
+                Ok(smallvec![first, second.clone(), third.unwrap().clone()])
+            }
+            ('-' | '!' | '*' | '/' | '&' | '%' | '^' | '+' | '<' | '=' | '>' | '|', '=', _)
+            | ('-' | '=' | '>', '>', _)
+            | ('<', '-', _)
+            | (':', ':', _)
+            | ('.', '.', _)
+            | ('&', '&', _)
+            | ('<', '<', _)
+            | ('|', '|', _) => {
+                let _ = self.next().unwrap();
+                Ok(smallvec![first, second.clone()])
+            }
+            _ => Ok(smallvec![first]),
+        }
+    }
+
     pub(crate) fn expect_fragment(
         &mut self,
         entry_point: parser::PrefixEntryPoint,
@@ -141,7 +185,7 @@ impl<'a> TtIter<'a> {
         ExpandResult { value: res, err }
     }
 
-    pub(crate) fn peek_n(&self, n: usize) -> Option<&tt::TokenTree> {
+    pub(crate) fn peek_n(&self, n: usize) -> Option<&'a tt::TokenTree> {
         self.inner.as_slice().get(n)
     }
 }
diff --git a/crates/parser/src/grammar.rs b/crates/parser/src/grammar.rs
index b746832961..485b612f08 100644
--- a/crates/parser/src/grammar.rs
+++ b/crates/parser/src/grammar.rs
@@ -51,7 +51,7 @@ pub(crate) mod entry {
         use super::*;
 
         pub(crate) fn vis(p: &mut Parser<'_>) {
-            let _ = opt_visibility(p, false);
+            opt_visibility(p, false);
         }
 
         pub(crate) fn block(p: &mut Parser<'_>) {
@@ -70,10 +70,10 @@ pub(crate) mod entry {
             types::type_(p);
         }
         pub(crate) fn expr(p: &mut Parser<'_>) {
-            let _ = expressions::expr(p);
+            expressions::expr(p);
         }
         pub(crate) fn path(p: &mut Parser<'_>) {
-            let _ = paths::type_path(p);
+            paths::type_path(p);
         }
         pub(crate) fn item(p: &mut Parser<'_>) {
             items::item_or_macro(p, true);
diff --git a/crates/parser/src/grammar/expressions.rs b/crates/parser/src/grammar/expressions.rs
index dcaceade65..8932330b82 100644
--- a/crates/parser/src/grammar/expressions.rs
+++ b/crates/parser/src/grammar/expressions.rs
@@ -288,7 +288,7 @@ fn expr_bp(
 }
 
 const LHS_FIRST: TokenSet =
-    atom::ATOM_EXPR_FIRST.union(TokenSet::new(&[T![&], T![*], T![!], T![.], T![-]]));
+    atom::ATOM_EXPR_FIRST.union(TokenSet::new(&[T![&], T![*], T![!], T![.], T![-], T![_]]));
 
 fn lhs(p: &mut Parser<'_>, r: Restrictions) -> Option<(CompletedMarker, BlockLike)> {
     let m;
diff --git a/crates/parser/src/grammar/expressions/atom.rs b/crates/parser/src/grammar/expressions/atom.rs
index 99f42a2662..efa3997353 100644
--- a/crates/parser/src/grammar/expressions/atom.rs
+++ b/crates/parser/src/grammar/expressions/atom.rs
@@ -48,6 +48,7 @@ pub(super) const ATOM_EXPR_FIRST: TokenSet =
         T![unsafe],
         T![return],
         T![yield],
+        T![do],
         T![break],
         T![continue],
         T![async],
@@ -93,6 +94,7 @@ pub(super) fn atom_expr(
         T![match] => match_expr(p),
         T![return] => return_expr(p),
         T![yield] => yield_expr(p),
+        T![do] if p.nth_at_contextual_kw(1, T![yeet]) => yeet_expr(p),
         T![continue] => continue_expr(p),
         T![break] => break_expr(p, r),
 
@@ -278,6 +280,8 @@ fn closure_expr(p: &mut Parser<'_>) -> CompletedMarker {
         // fn main() { || -> i32 { 92 }(); }
         block_expr(p);
     } else if p.at_ts(EXPR_FIRST) {
+        // test closure_body_underscore_assignment
+        // fn main() { || _ = 0; }
         expr(p);
     } else {
         p.error("expected expression");
@@ -531,6 +535,7 @@ fn return_expr(p: &mut Parser<'_>) -> CompletedMarker {
     }
     m.complete(p, RETURN_EXPR)
 }
+
 // test yield_expr
 // fn foo() {
 //     yield;
@@ -546,6 +551,23 @@ fn yield_expr(p: &mut Parser<'_>) -> CompletedMarker {
     m.complete(p, YIELD_EXPR)
 }
 
+// test yeet_expr
+// fn foo() {
+//     do yeet;
+//     do yeet 1
+// }
+fn yeet_expr(p: &mut Parser<'_>) -> CompletedMarker {
+    assert!(p.at(T![do]));
+    assert!(p.nth_at_contextual_kw(1, T![yeet]));
+    let m = p.start();
+    p.bump(T![do]);
+    p.bump_remap(T![yeet]);
+    if p.at_ts(EXPR_FIRST) {
+        expr(p);
+    }
+    m.complete(p, YEET_EXPR)
+}
+
 // test continue_expr
 // fn foo() {
 //     loop {
diff --git a/crates/parser/src/grammar/paths.rs b/crates/parser/src/grammar/paths.rs
index 5dc9c6c82a..af3b6f63cf 100644
--- a/crates/parser/src/grammar/paths.rs
+++ b/crates/parser/src/grammar/paths.rs
@@ -83,11 +83,12 @@ fn path_segment(p: &mut Parser<'_>, mode: Mode, first: bool) {
         }
         p.expect(T![>]);
     } else {
-        let mut empty = true;
-        if first {
+        let empty = if first {
             p.eat(T![::]);
-            empty = false;
-        }
+            false
+        } else {
+            true
+        };
         match p.current() {
             IDENT => {
                 name_ref(p);
diff --git a/crates/parser/src/grammar/patterns.rs b/crates/parser/src/grammar/patterns.rs
index bc1224af9b..abcefffa23 100644
--- a/crates/parser/src/grammar/patterns.rs
+++ b/crates/parser/src/grammar/patterns.rs
@@ -62,39 +62,50 @@ fn pattern_r(p: &mut Parser<'_>, recovery_set: TokenSet) {
 }
 
 fn pattern_single_r(p: &mut Parser<'_>, recovery_set: TokenSet) {
-    if let Some(lhs) = atom_pat(p, recovery_set) {
-        // test range_pat
-        // fn main() {
-        //     match 92 {
-        //         0 ... 100 => (),
-        //         101 ..= 200 => (),
-        //         200 .. 301 => (),
-        //         302 .. => (),
-        //     }
-        //
-        //     match Some(10 as u8) {
-        //         Some(0) | None => (),
-        //         Some(1..) => ()
-        //     }
-        //
-        //     match () {
-        //         S { a: 0 } => (),
-        //         S { a: 1.. } => (),
-        //     }
-        //
-        //     match () {
-        //         [0] => (),
-        //         [1..] => (),
-        //     }
-        //
-        //     match (10 as u8, 5 as u8) {
-        //         (0, _) => (),
-        //         (1.., _) => ()
-        //     }
-        // }
+    // test range_pat
+    // fn main() {
+    //     match 92 {
+    //         0 ... 100 => (),
+    //         101 ..= 200 => (),
+    //         200 .. 301 => (),
+    //         302 .. => (),
+    //         ..= 303 => (),
+    //     }
+    //
+    //     match Some(10 as u8) {
+    //         Some(0) | None => (),
+    //         Some(1..) => (),
+    //         Some(..=2) => (),
+    //     }
+    //
+    //     match () {
+    //         S { a: 0 } => (),
+    //         S { a: 1.. } => (),
+    //         S { a: ..=2 } => (),
+    //     }
+    //
+    //     match () {
+    //         [0] => (),
+    //         [1..] => (),
+    //         [..=2] => (),
+    //     }
+    //
+    //     match (10 as u8, 5 as u8) {
+    //         (0, _) => (),
+    //         (1.., _) => (),
+    //         (..=2, _) => (),
+    //     }
+    // }
 
-        // FIXME: support half_open_range_patterns (`..=2`),
-        // exclusive_range_pattern (`..5`) with missing lhs
+    if p.at(T![..=]) {
+        let m = p.start();
+        p.bump(T![..=]);
+        atom_pat(p, recovery_set);
+        m.complete(p, RANGE_PAT);
+        return;
+    }
+
+    if let Some(lhs) = atom_pat(p, recovery_set) {
         for range_op in [T![...], T![..=], T![..]] {
             if p.at(range_op) {
                 let m = lhs.precede(p);
@@ -115,11 +126,21 @@ fn pattern_single_r(p: &mut Parser<'_>, recovery_set: TokenSet) {
                 //             ^
                 // `[0..]`
                 //      ^
-                if matches!(p.current(), T![=] | T![,] | T![:] | T![')'] | T!['}'] | T![']']) {
+                // `0 .. if`
+                //       ^
+                if matches!(
+                    p.current(),
+                    T![=] | T![,] | T![:] | T![')'] | T!['}'] | T![']'] | T![if]
+                ) {
                     // test half_open_range_pat
                     // fn f() {
                     //     let 0 .. = 1u32;
                     //     let 0..: _ = 1u32;
+                    //
+                    //     match 42 {
+                    //         0 .. if true => (),
+                    //         _ => (),
+                    //     }
                     // }
                 } else {
                     atom_pat(p, recovery_set);
diff --git a/crates/parser/src/lexed_str.rs b/crates/parser/src/lexed_str.rs
index f4b9988eac..b48921f191 100644
--- a/crates/parser/src/lexed_str.rs
+++ b/crates/parser/src/lexed_str.rs
@@ -57,7 +57,7 @@ impl<'a> LexedStr<'a> {
         let mut conv = Converter::new(text);
         conv.extend_token(&token.kind, text);
         match &*conv.res.kind {
-            [kind] => Some((*kind, conv.res.error.pop().map(|it| it.msg.clone()))),
+            [kind] => Some((*kind, conv.res.error.pop().map(|it| it.msg))),
             _ => None,
         }
     }
diff --git a/crates/parser/src/output.rs b/crates/parser/src/output.rs
index e9ec9822d6..6ca841cfe0 100644
--- a/crates/parser/src/output.rs
+++ b/crates/parser/src/output.rs
@@ -54,7 +54,7 @@ impl Output {
     }
 
     pub(crate) fn token(&mut self, kind: SyntaxKind, n_tokens: u8) {
-        let e = ((kind as u16 as u32) << 16) | ((n_tokens as u32) << 8) | (0 << 4) | 1;
+        let e = ((kind as u16 as u32) << 16) | ((n_tokens as u32) << 8) | 1;
         self.event.push(e)
     }
 
diff --git a/crates/parser/src/parser.rs b/crates/parser/src/parser.rs
index 48d8350e07..48aecb35be 100644
--- a/crates/parser/src/parser.rs
+++ b/crates/parser/src/parser.rs
@@ -148,11 +148,16 @@ impl<'t> Parser<'t> {
         kinds.contains(self.current())
     }
 
-    /// Checks if the current token is contextual keyword with text `t`.
+    /// Checks if the current token is contextual keyword `kw`.
     pub(crate) fn at_contextual_kw(&self, kw: SyntaxKind) -> bool {
         self.inp.contextual_kind(self.pos) == kw
     }
 
+    /// Checks if the nth token is contextual keyword `kw`.
+    pub(crate) fn nth_at_contextual_kw(&self, n: usize, kw: SyntaxKind) -> bool {
+        self.inp.contextual_kind(self.pos + n) == kw
+    }
+
     /// Starts a new node in the syntax tree. All nodes and tokens
     /// consumed between the `start` and the corresponding `Marker::complete`
     /// belong to the same node.
@@ -162,7 +167,7 @@ impl<'t> Parser<'t> {
         Marker::new(pos)
     }
 
-    /// Consume the next token if `kind` matches.
+    /// Consume the next token. Panics if the parser isn't currently at `kind`.
     pub(crate) fn bump(&mut self, kind: SyntaxKind) {
         assert!(self.eat(kind));
     }
@@ -205,7 +210,7 @@ impl<'t> Parser<'t> {
         if self.eat(kind) {
             return true;
         }
-        self.error(format!("expected {:?}", kind));
+        self.error(format!("expected {kind:?}"));
         false
     }
 
@@ -237,6 +242,7 @@ impl<'t> Parser<'t> {
 
     fn do_bump(&mut self, kind: SyntaxKind, n_raw_tokens: u8) {
         self.pos += n_raw_tokens as usize;
+        self.steps.set(0);
         self.push_event(Event::Token { kind, n_raw_tokens });
     }
 
diff --git a/crates/parser/src/shortcuts.rs b/crates/parser/src/shortcuts.rs
index 4b805faddc..2be4050d13 100644
--- a/crates/parser/src/shortcuts.rs
+++ b/crates/parser/src/shortcuts.rs
@@ -80,8 +80,8 @@ impl<'a> LexedStr<'a> {
             State::PendingEnter | State::Normal => unreachable!(),
         }
 
-        let is_eof = builder.pos == builder.lexed.len();
-        is_eof
+        // is_eof?
+        builder.pos == builder.lexed.len()
     }
 }
 
diff --git a/crates/parser/src/syntax_kind/generated.rs b/crates/parser/src/syntax_kind/generated.rs
index c84f45f1f8..52b3fc23d5 100644
--- a/crates/parser/src/syntax_kind/generated.rs
+++ b/crates/parser/src/syntax_kind/generated.rs
@@ -69,6 +69,7 @@ pub enum SyntaxKind {
     CONST_KW,
     CONTINUE_KW,
     CRATE_KW,
+    DO_KW,
     DYN_KW,
     ELSE_KW,
     ENUM_KW,
@@ -109,6 +110,7 @@ pub enum SyntaxKind {
     UNION_KW,
     RAW_KW,
     MACRO_RULES_KW,
+    YEET_KW,
     INT_NUMBER,
     FLOAT_NUMBER,
     CHAR,
@@ -188,6 +190,7 @@ pub enum SyntaxKind {
     STMT_LIST,
     RETURN_EXPR,
     YIELD_EXPR,
+    YEET_EXPR,
     LET_EXPR,
     UNDERSCORE_EXPR,
     MACRO_EXPR,
@@ -272,6 +275,7 @@ impl SyntaxKind {
                 | CONST_KW
                 | CONTINUE_KW
                 | CRATE_KW
+                | DO_KW
                 | DYN_KW
                 | ELSE_KW
                 | ENUM_KW
@@ -312,6 +316,7 @@ impl SyntaxKind {
                 | UNION_KW
                 | RAW_KW
                 | MACRO_RULES_KW
+                | YEET_KW
         )
     }
     pub fn is_punct(self) -> bool {
@@ -384,6 +389,7 @@ impl SyntaxKind {
             "const" => CONST_KW,
             "continue" => CONTINUE_KW,
             "crate" => CRATE_KW,
+            "do" => DO_KW,
             "dyn" => DYN_KW,
             "else" => ELSE_KW,
             "enum" => ENUM_KW,
@@ -430,6 +436,7 @@ impl SyntaxKind {
             "union" => UNION_KW,
             "raw" => RAW_KW,
             "macro_rules" => MACRO_RULES_KW,
+            "yeet" => YEET_KW,
             _ => return None,
         };
         Some(kw)
@@ -470,5 +477,5 @@ impl SyntaxKind {
     }
 }
 #[macro_export]
-macro_rules ! T { [;] => { $ crate :: SyntaxKind :: SEMICOLON } ; [,] => { $ crate :: SyntaxKind :: COMMA } ; ['('] => { $ crate :: SyntaxKind :: L_PAREN } ; [')'] => { $ crate :: SyntaxKind :: R_PAREN } ; ['{'] => { $ crate :: SyntaxKind :: L_CURLY } ; ['}'] => { $ crate :: SyntaxKind :: R_CURLY } ; ['['] => { $ crate :: SyntaxKind :: L_BRACK } ; [']'] => { $ crate :: SyntaxKind :: R_BRACK } ; [<] => { $ crate :: SyntaxKind :: L_ANGLE } ; [>] => { $ crate :: SyntaxKind :: R_ANGLE } ; [@] => { $ crate :: SyntaxKind :: AT } ; [#] => { $ crate :: SyntaxKind :: POUND } ; [~] => { $ crate :: SyntaxKind :: TILDE } ; [?] => { $ crate :: SyntaxKind :: QUESTION } ; [$] => { $ crate :: SyntaxKind :: DOLLAR } ; [&] => { $ crate :: SyntaxKind :: AMP } ; [|] => { $ crate :: SyntaxKind :: PIPE } ; [+] => { $ crate :: SyntaxKind :: PLUS } ; [*] => { $ crate :: SyntaxKind :: STAR } ; [/] => { $ crate :: SyntaxKind :: SLASH } ; [^] => { $ crate :: SyntaxKind :: CARET } ; [%] => { $ crate :: SyntaxKind :: PERCENT } ; [_] => { $ crate :: SyntaxKind :: UNDERSCORE } ; [.] => { $ crate :: SyntaxKind :: DOT } ; [..] => { $ crate :: SyntaxKind :: DOT2 } ; [...] => { $ crate :: SyntaxKind :: DOT3 } ; [..=] => { $ crate :: SyntaxKind :: DOT2EQ } ; [:] => { $ crate :: SyntaxKind :: COLON } ; [::] => { $ crate :: SyntaxKind :: COLON2 } ; [=] => { $ crate :: SyntaxKind :: EQ } ; [==] => { $ crate :: SyntaxKind :: EQ2 } ; [=>] => { $ crate :: SyntaxKind :: FAT_ARROW } ; [!] => { $ crate :: SyntaxKind :: BANG } ; [!=] => { $ crate :: SyntaxKind :: NEQ } ; [-] => { $ crate :: SyntaxKind :: MINUS } ; [->] => { $ crate :: SyntaxKind :: THIN_ARROW } ; [<=] => { $ crate :: SyntaxKind :: LTEQ } ; [>=] => { $ crate :: SyntaxKind :: GTEQ } ; [+=] => { $ crate :: SyntaxKind :: PLUSEQ } ; [-=] => { $ crate :: SyntaxKind :: MINUSEQ } ; [|=] => { $ crate :: SyntaxKind :: PIPEEQ } ; [&=] => { $ crate :: SyntaxKind :: AMPEQ } ; [^=] => { $ crate :: SyntaxKind :: CARETEQ } ; [/=] => { $ crate :: SyntaxKind :: SLASHEQ } ; [*=] => { $ crate :: SyntaxKind :: STAREQ } ; [%=] => { $ crate :: SyntaxKind :: PERCENTEQ } ; [&&] => { $ crate :: SyntaxKind :: AMP2 } ; [||] => { $ crate :: SyntaxKind :: PIPE2 } ; [<<] => { $ crate :: SyntaxKind :: SHL } ; [>>] => { $ crate :: SyntaxKind :: SHR } ; [<<=] => { $ crate :: SyntaxKind :: SHLEQ } ; [>>=] => { $ crate :: SyntaxKind :: SHREQ } ; [as] => { $ crate :: SyntaxKind :: AS_KW } ; [async] => { $ crate :: SyntaxKind :: ASYNC_KW } ; [await] => { $ crate :: SyntaxKind :: AWAIT_KW } ; [box] => { $ crate :: SyntaxKind :: BOX_KW } ; [break] => { $ crate :: SyntaxKind :: BREAK_KW } ; [const] => { $ crate :: SyntaxKind :: CONST_KW } ; [continue] => { $ crate :: SyntaxKind :: CONTINUE_KW } ; [crate] => { $ crate :: SyntaxKind :: CRATE_KW } ; [dyn] => { $ crate :: SyntaxKind :: DYN_KW } ; [else] => { $ crate :: SyntaxKind :: ELSE_KW } ; [enum] => { $ crate :: SyntaxKind :: ENUM_KW } ; [extern] => { $ crate :: SyntaxKind :: EXTERN_KW } ; [false] => { $ crate :: SyntaxKind :: FALSE_KW } ; [fn] => { $ crate :: SyntaxKind :: FN_KW } ; [for] => { $ crate :: SyntaxKind :: FOR_KW } ; [if] => { $ crate :: SyntaxKind :: IF_KW } ; [impl] => { $ crate :: SyntaxKind :: IMPL_KW } ; [in] => { $ crate :: SyntaxKind :: IN_KW } ; [let] => { $ crate :: SyntaxKind :: LET_KW } ; [loop] => { $ crate :: SyntaxKind :: LOOP_KW } ; [macro] => { $ crate :: SyntaxKind :: MACRO_KW } ; [match] => { $ crate :: SyntaxKind :: MATCH_KW } ; [mod] => { $ crate :: SyntaxKind :: MOD_KW } ; [move] => { $ crate :: SyntaxKind :: MOVE_KW } ; [mut] => { $ crate :: SyntaxKind :: MUT_KW } ; [pub] => { $ crate :: SyntaxKind :: PUB_KW } ; [ref] => { $ crate :: SyntaxKind :: REF_KW } ; [return] => { $ crate :: SyntaxKind :: RETURN_KW } ; [self] => { $ crate :: SyntaxKind :: SELF_KW } ; [Self] => { $ crate :: SyntaxKind :: SELF_TYPE_KW } ; [static] => { $ crate :: SyntaxKind :: STATIC_KW } ; [struct] => { $ crate :: SyntaxKind :: STRUCT_KW } ; [super] => { $ crate :: SyntaxKind :: SUPER_KW } ; [trait] => { $ crate :: SyntaxKind :: TRAIT_KW } ; [true] => { $ crate :: SyntaxKind :: TRUE_KW } ; [try] => { $ crate :: SyntaxKind :: TRY_KW } ; [type] => { $ crate :: SyntaxKind :: TYPE_KW } ; [unsafe] => { $ crate :: SyntaxKind :: UNSAFE_KW } ; [use] => { $ crate :: SyntaxKind :: USE_KW } ; [where] => { $ crate :: SyntaxKind :: WHERE_KW } ; [while] => { $ crate :: SyntaxKind :: WHILE_KW } ; [yield] => { $ crate :: SyntaxKind :: YIELD_KW } ; [auto] => { $ crate :: SyntaxKind :: AUTO_KW } ; [default] => { $ crate :: SyntaxKind :: DEFAULT_KW } ; [existential] => { $ crate :: SyntaxKind :: EXISTENTIAL_KW } ; [union] => { $ crate :: SyntaxKind :: UNION_KW } ; [raw] => { $ crate :: SyntaxKind :: RAW_KW } ; [macro_rules] => { $ crate :: SyntaxKind :: MACRO_RULES_KW } ; [lifetime_ident] => { $ crate :: SyntaxKind :: LIFETIME_IDENT } ; [ident] => { $ crate :: SyntaxKind :: IDENT } ; [shebang] => { $ crate :: SyntaxKind :: SHEBANG } ; }
+macro_rules ! T { [;] => { $ crate :: SyntaxKind :: SEMICOLON } ; [,] => { $ crate :: SyntaxKind :: COMMA } ; ['('] => { $ crate :: SyntaxKind :: L_PAREN } ; [')'] => { $ crate :: SyntaxKind :: R_PAREN } ; ['{'] => { $ crate :: SyntaxKind :: L_CURLY } ; ['}'] => { $ crate :: SyntaxKind :: R_CURLY } ; ['['] => { $ crate :: SyntaxKind :: L_BRACK } ; [']'] => { $ crate :: SyntaxKind :: R_BRACK } ; [<] => { $ crate :: SyntaxKind :: L_ANGLE } ; [>] => { $ crate :: SyntaxKind :: R_ANGLE } ; [@] => { $ crate :: SyntaxKind :: AT } ; [#] => { $ crate :: SyntaxKind :: POUND } ; [~] => { $ crate :: SyntaxKind :: TILDE } ; [?] => { $ crate :: SyntaxKind :: QUESTION } ; [$] => { $ crate :: SyntaxKind :: DOLLAR } ; [&] => { $ crate :: SyntaxKind :: AMP } ; [|] => { $ crate :: SyntaxKind :: PIPE } ; [+] => { $ crate :: SyntaxKind :: PLUS } ; [*] => { $ crate :: SyntaxKind :: STAR } ; [/] => { $ crate :: SyntaxKind :: SLASH } ; [^] => { $ crate :: SyntaxKind :: CARET } ; [%] => { $ crate :: SyntaxKind :: PERCENT } ; [_] => { $ crate :: SyntaxKind :: UNDERSCORE } ; [.] => { $ crate :: SyntaxKind :: DOT } ; [..] => { $ crate :: SyntaxKind :: DOT2 } ; [...] => { $ crate :: SyntaxKind :: DOT3 } ; [..=] => { $ crate :: SyntaxKind :: DOT2EQ } ; [:] => { $ crate :: SyntaxKind :: COLON } ; [::] => { $ crate :: SyntaxKind :: COLON2 } ; [=] => { $ crate :: SyntaxKind :: EQ } ; [==] => { $ crate :: SyntaxKind :: EQ2 } ; [=>] => { $ crate :: SyntaxKind :: FAT_ARROW } ; [!] => { $ crate :: SyntaxKind :: BANG } ; [!=] => { $ crate :: SyntaxKind :: NEQ } ; [-] => { $ crate :: SyntaxKind :: MINUS } ; [->] => { $ crate :: SyntaxKind :: THIN_ARROW } ; [<=] => { $ crate :: SyntaxKind :: LTEQ } ; [>=] => { $ crate :: SyntaxKind :: GTEQ } ; [+=] => { $ crate :: SyntaxKind :: PLUSEQ } ; [-=] => { $ crate :: SyntaxKind :: MINUSEQ } ; [|=] => { $ crate :: SyntaxKind :: PIPEEQ } ; [&=] => { $ crate :: SyntaxKind :: AMPEQ } ; [^=] => { $ crate :: SyntaxKind :: CARETEQ } ; [/=] => { $ crate :: SyntaxKind :: SLASHEQ } ; [*=] => { $ crate :: SyntaxKind :: STAREQ } ; [%=] => { $ crate :: SyntaxKind :: PERCENTEQ } ; [&&] => { $ crate :: SyntaxKind :: AMP2 } ; [||] => { $ crate :: SyntaxKind :: PIPE2 } ; [<<] => { $ crate :: SyntaxKind :: SHL } ; [>>] => { $ crate :: SyntaxKind :: SHR } ; [<<=] => { $ crate :: SyntaxKind :: SHLEQ } ; [>>=] => { $ crate :: SyntaxKind :: SHREQ } ; [as] => { $ crate :: SyntaxKind :: AS_KW } ; [async] => { $ crate :: SyntaxKind :: ASYNC_KW } ; [await] => { $ crate :: SyntaxKind :: AWAIT_KW } ; [box] => { $ crate :: SyntaxKind :: BOX_KW } ; [break] => { $ crate :: SyntaxKind :: BREAK_KW } ; [const] => { $ crate :: SyntaxKind :: CONST_KW } ; [continue] => { $ crate :: SyntaxKind :: CONTINUE_KW } ; [crate] => { $ crate :: SyntaxKind :: CRATE_KW } ; [do] => { $ crate :: SyntaxKind :: DO_KW } ; [dyn] => { $ crate :: SyntaxKind :: DYN_KW } ; [else] => { $ crate :: SyntaxKind :: ELSE_KW } ; [enum] => { $ crate :: SyntaxKind :: ENUM_KW } ; [extern] => { $ crate :: SyntaxKind :: EXTERN_KW } ; [false] => { $ crate :: SyntaxKind :: FALSE_KW } ; [fn] => { $ crate :: SyntaxKind :: FN_KW } ; [for] => { $ crate :: SyntaxKind :: FOR_KW } ; [if] => { $ crate :: SyntaxKind :: IF_KW } ; [impl] => { $ crate :: SyntaxKind :: IMPL_KW } ; [in] => { $ crate :: SyntaxKind :: IN_KW } ; [let] => { $ crate :: SyntaxKind :: LET_KW } ; [loop] => { $ crate :: SyntaxKind :: LOOP_KW } ; [macro] => { $ crate :: SyntaxKind :: MACRO_KW } ; [match] => { $ crate :: SyntaxKind :: MATCH_KW } ; [mod] => { $ crate :: SyntaxKind :: MOD_KW } ; [move] => { $ crate :: SyntaxKind :: MOVE_KW } ; [mut] => { $ crate :: SyntaxKind :: MUT_KW } ; [pub] => { $ crate :: SyntaxKind :: PUB_KW } ; [ref] => { $ crate :: SyntaxKind :: REF_KW } ; [return] => { $ crate :: SyntaxKind :: RETURN_KW } ; [self] => { $ crate :: SyntaxKind :: SELF_KW } ; [Self] => { $ crate :: SyntaxKind :: SELF_TYPE_KW } ; [static] => { $ crate :: SyntaxKind :: STATIC_KW } ; [struct] => { $ crate :: SyntaxKind :: STRUCT_KW } ; [super] => { $ crate :: SyntaxKind :: SUPER_KW } ; [trait] => { $ crate :: SyntaxKind :: TRAIT_KW } ; [true] => { $ crate :: SyntaxKind :: TRUE_KW } ; [try] => { $ crate :: SyntaxKind :: TRY_KW } ; [type] => { $ crate :: SyntaxKind :: TYPE_KW } ; [unsafe] => { $ crate :: SyntaxKind :: UNSAFE_KW } ; [use] => { $ crate :: SyntaxKind :: USE_KW } ; [where] => { $ crate :: SyntaxKind :: WHERE_KW } ; [while] => { $ crate :: SyntaxKind :: WHILE_KW } ; [yield] => { $ crate :: SyntaxKind :: YIELD_KW } ; [auto] => { $ crate :: SyntaxKind :: AUTO_KW } ; [default] => { $ crate :: SyntaxKind :: DEFAULT_KW } ; [existential] => { $ crate :: SyntaxKind :: EXISTENTIAL_KW } ; [union] => { $ crate :: SyntaxKind :: UNION_KW } ; [raw] => { $ crate :: SyntaxKind :: RAW_KW } ; [macro_rules] => { $ crate :: SyntaxKind :: MACRO_RULES_KW } ; [yeet] => { $ crate :: SyntaxKind :: YEET_KW } ; [lifetime_ident] => { $ crate :: SyntaxKind :: LIFETIME_IDENT } ; [ident] => { $ crate :: SyntaxKind :: IDENT } ; [shebang] => { $ crate :: SyntaxKind :: SHEBANG } ; }
 pub use T;
diff --git a/crates/parser/src/tests.rs b/crates/parser/src/tests.rs
index 735c0b3e40..c1b4e9a7d8 100644
--- a/crates/parser/src/tests.rs
+++ b/crates/parser/src/tests.rs
@@ -37,8 +37,8 @@ fn lex(text: &str) -> String {
         let text = lexed.text(i);
         let error = lexed.error(i);
 
-        let error = error.map(|err| format!(" error: {}", err)).unwrap_or_default();
-        writeln!(res, "{:?} {:?}{}", kind, text, error).unwrap();
+        let error = error.map(|err| format!(" error: {err}")).unwrap_or_default();
+        writeln!(res, "{kind:?} {text:?}{error}").unwrap();
     }
     res
 }
@@ -47,7 +47,7 @@ fn lex(text: &str) -> String {
 fn parse_ok() {
     for case in TestCase::list("parser/ok") {
         let (actual, errors) = parse(TopEntryPoint::SourceFile, &case.text);
-        assert!(!errors, "errors in an OK file {}:\n{}", case.rs.display(), actual);
+        assert!(!errors, "errors in an OK file {}:\n{actual}", case.rs.display());
         expect_file![case.rast].assert_eq(&actual);
     }
 }
@@ -56,7 +56,7 @@ fn parse_ok() {
 fn parse_inline_ok() {
     for case in TestCase::list("parser/inline/ok") {
         let (actual, errors) = parse(TopEntryPoint::SourceFile, &case.text);
-        assert!(!errors, "errors in an OK file {}:\n{}", case.rs.display(), actual);
+        assert!(!errors, "errors in an OK file {}:\n{actual}", case.rs.display());
         expect_file![case.rast].assert_eq(&actual);
     }
 }
@@ -65,7 +65,7 @@ fn parse_inline_ok() {
 fn parse_err() {
     for case in TestCase::list("parser/err") {
         let (actual, errors) = parse(TopEntryPoint::SourceFile, &case.text);
-        assert!(errors, "no errors in an ERR file {}:\n{}", case.rs.display(), actual);
+        assert!(errors, "no errors in an ERR file {}:\n{actual}", case.rs.display());
         expect_file![case.rast].assert_eq(&actual)
     }
 }
@@ -74,7 +74,7 @@ fn parse_err() {
 fn parse_inline_err() {
     for case in TestCase::list("parser/inline/err") {
         let (actual, errors) = parse(TopEntryPoint::SourceFile, &case.text);
-        assert!(errors, "no errors in an ERR file {}:\n{}", case.rs.display(), actual);
+        assert!(errors, "no errors in an ERR file {}:\n{actual}", case.rs.display());
         expect_file![case.rast].assert_eq(&actual)
     }
 }
@@ -93,14 +93,12 @@ fn parse(entry: TopEntryPoint, text: &str) -> (String, bool) {
         crate::StrStep::Token { kind, text } => {
             assert!(depth > 0);
             len += text.len();
-            write!(buf, "{}", indent).unwrap();
-            write!(buf, "{:?} {:?}\n", kind, text).unwrap();
+            writeln!(buf, "{indent}{kind:?} {text:?}").unwrap();
         }
         crate::StrStep::Enter { kind } => {
             assert!(depth > 0 || len == 0);
             depth += 1;
-            write!(buf, "{}", indent).unwrap();
-            write!(buf, "{:?}\n", kind).unwrap();
+            writeln!(buf, "{indent}{kind:?}").unwrap();
             indent.push_str("  ");
         }
         crate::StrStep::Exit => {
@@ -111,7 +109,7 @@ fn parse(entry: TopEntryPoint, text: &str) -> (String, bool) {
         }
         crate::StrStep::Error { msg, pos } => {
             assert!(depth > 0);
-            errors.push(format!("error {}: {}\n", pos, msg))
+            errors.push(format!("error {pos}: {msg}\n"))
         }
     });
     assert_eq!(
@@ -124,7 +122,7 @@ fn parse(entry: TopEntryPoint, text: &str) -> (String, bool) {
 
     for (token, msg) in lexed.errors() {
         let pos = lexed.text_start(token);
-        errors.push(format!("error {}: {}\n", pos, msg));
+        errors.push(format!("error {pos}: {msg}\n"));
     }
 
     let has_errors = !errors.is_empty();
@@ -149,7 +147,7 @@ impl TestCase {
 
         let mut res = Vec::new();
         let read_dir = fs::read_dir(&dir)
-            .unwrap_or_else(|err| panic!("can't `read_dir` {}: {}", dir.display(), err));
+            .unwrap_or_else(|err| panic!("can't `read_dir` {}: {err}", dir.display()));
         for file in read_dir {
             let file = file.unwrap();
             let path = file.path();
diff --git a/crates/parser/src/tests/sourcegen_inline_tests.rs b/crates/parser/src/tests/sourcegen_inline_tests.rs
index 7b2b703deb..54e85c0734 100644
--- a/crates/parser/src/tests/sourcegen_inline_tests.rs
+++ b/crates/parser/src/tests/sourcegen_inline_tests.rs
@@ -23,7 +23,7 @@ fn sourcegen_parser_tests() {
         // ok is never actually read, but it needs to be specified to create a Test in existing_tests
         let existing = existing_tests(&tests_dir, true);
         for t in existing.keys().filter(|&t| !tests.contains_key(t)) {
-            panic!("Test is deleted: {}", t);
+            panic!("Test is deleted: {t}");
         }
 
         let mut new_idx = existing.len() + 1;
@@ -31,7 +31,7 @@ fn sourcegen_parser_tests() {
             let path = match existing.get(name) {
                 Some((path, _test)) => path.clone(),
                 None => {
-                    let file_name = format!("{:04}_{}.rs", new_idx, name);
+                    let file_name = format!("{new_idx:04}_{name}.rs");
                     new_idx += 1;
                     tests_dir.join(file_name)
                 }
@@ -116,7 +116,7 @@ fn existing_tests(dir: &Path, ok: bool) -> HashMap<String, (PathBuf, Test)> {
         let text = fs::read_to_string(&path).unwrap();
         let test = Test { name: name.clone(), text, ok };
         if let Some(old) = res.insert(name, (path, test)) {
-            println!("Duplicate test: {:?}", old);
+            println!("Duplicate test: {old:?}");
         }
     }
     res
diff --git a/crates/parser/test_data/parser/inline/ok/0058_range_pat.rast b/crates/parser/test_data/parser/inline/ok/0058_range_pat.rast
index cfef5d3f95..d9981c5071 100644
--- a/crates/parser/test_data/parser/inline/ok/0058_range_pat.rast
+++ b/crates/parser/test_data/parser/inline/ok/0058_range_pat.rast
@@ -93,6 +93,21 @@ SOURCE_FILE
                   L_PAREN "("
                   R_PAREN ")"
                 COMMA ","
+              WHITESPACE "\n        "
+              MATCH_ARM
+                RANGE_PAT
+                  DOT2EQ "..="
+                  WHITESPACE " "
+                  LITERAL_PAT
+                    LITERAL
+                      INT_NUMBER "303"
+                WHITESPACE " "
+                FAT_ARROW "=>"
+                WHITESPACE " "
+                TUPLE_EXPR
+                  L_PAREN "("
+                  R_PAREN ")"
+                COMMA ","
               WHITESPACE "\n    "
               R_CURLY "}"
         WHITESPACE "\n\n    "
@@ -169,6 +184,28 @@ SOURCE_FILE
                 TUPLE_EXPR
                   L_PAREN "("
                   R_PAREN ")"
+                COMMA ","
+              WHITESPACE "\n        "
+              MATCH_ARM
+                TUPLE_STRUCT_PAT
+                  PATH
+                    PATH_SEGMENT
+                      NAME_REF
+                        IDENT "Some"
+                  L_PAREN "("
+                  RANGE_PAT
+                    DOT2EQ "..="
+                    LITERAL_PAT
+                      LITERAL
+                        INT_NUMBER "2"
+                  R_PAREN ")"
+                WHITESPACE " "
+                FAT_ARROW "=>"
+                WHITESPACE " "
+                TUPLE_EXPR
+                  L_PAREN "("
+                  R_PAREN ")"
+                COMMA ","
               WHITESPACE "\n    "
               R_CURLY "}"
         WHITESPACE "\n\n    "
@@ -240,6 +277,36 @@ SOURCE_FILE
                   L_PAREN "("
                   R_PAREN ")"
                 COMMA ","
+              WHITESPACE "\n        "
+              MATCH_ARM
+                RECORD_PAT
+                  PATH
+                    PATH_SEGMENT
+                      NAME_REF
+                        IDENT "S"
+                  WHITESPACE " "
+                  RECORD_PAT_FIELD_LIST
+                    L_CURLY "{"
+                    WHITESPACE " "
+                    RECORD_PAT_FIELD
+                      NAME_REF
+                        IDENT "a"
+                      COLON ":"
+                      WHITESPACE " "
+                      RANGE_PAT
+                        DOT2EQ "..="
+                        LITERAL_PAT
+                          LITERAL
+                            INT_NUMBER "2"
+                    WHITESPACE " "
+                    R_CURLY "}"
+                WHITESPACE " "
+                FAT_ARROW "=>"
+                WHITESPACE " "
+                TUPLE_EXPR
+                  L_PAREN "("
+                  R_PAREN ")"
+                COMMA ","
               WHITESPACE "\n    "
               R_CURLY "}"
         WHITESPACE "\n\n    "
@@ -285,6 +352,23 @@ SOURCE_FILE
                   L_PAREN "("
                   R_PAREN ")"
                 COMMA ","
+              WHITESPACE "\n        "
+              MATCH_ARM
+                SLICE_PAT
+                  L_BRACK "["
+                  RANGE_PAT
+                    DOT2EQ "..="
+                    LITERAL_PAT
+                      LITERAL
+                        INT_NUMBER "2"
+                  R_BRACK "]"
+                WHITESPACE " "
+                FAT_ARROW "=>"
+                WHITESPACE " "
+                TUPLE_EXPR
+                  L_PAREN "("
+                  R_PAREN ")"
+                COMMA ","
               WHITESPACE "\n    "
               R_CURLY "}"
         WHITESPACE "\n\n    "
@@ -360,6 +444,28 @@ SOURCE_FILE
               TUPLE_EXPR
                 L_PAREN "("
                 R_PAREN ")"
+              COMMA ","
+            WHITESPACE "\n        "
+            MATCH_ARM
+              TUPLE_PAT
+                L_PAREN "("
+                RANGE_PAT
+                  DOT2EQ "..="
+                  LITERAL_PAT
+                    LITERAL
+                      INT_NUMBER "2"
+                COMMA ","
+                WHITESPACE " "
+                WILDCARD_PAT
+                  UNDERSCORE "_"
+                R_PAREN ")"
+              WHITESPACE " "
+              FAT_ARROW "=>"
+              WHITESPACE " "
+              TUPLE_EXPR
+                L_PAREN "("
+                R_PAREN ")"
+              COMMA ","
             WHITESPACE "\n    "
             R_CURLY "}"
         WHITESPACE "\n"
diff --git a/crates/parser/test_data/parser/inline/ok/0058_range_pat.rs b/crates/parser/test_data/parser/inline/ok/0058_range_pat.rs
index 2411d51096..b54354211d 100644
--- a/crates/parser/test_data/parser/inline/ok/0058_range_pat.rs
+++ b/crates/parser/test_data/parser/inline/ok/0058_range_pat.rs
@@ -4,25 +4,30 @@ fn main() {
         101 ..= 200 => (),
         200 .. 301 => (),
         302 .. => (),
+        ..= 303 => (),
     }
 
     match Some(10 as u8) {
         Some(0) | None => (),
-        Some(1..) => ()
+        Some(1..) => (),
+        Some(..=2) => (),
     }
 
     match () {
         S { a: 0 } => (),
         S { a: 1.. } => (),
+        S { a: ..=2 } => (),
     }
 
     match () {
         [0] => (),
         [1..] => (),
+        [..=2] => (),
     }
 
     match (10 as u8, 5 as u8) {
         (0, _) => (),
-        (1.., _) => ()
+        (1.., _) => (),
+        (..=2, _) => (),
     }
 }
diff --git a/crates/parser/test_data/parser/inline/ok/0166_half_open_range_pat.rast b/crates/parser/test_data/parser/inline/ok/0166_half_open_range_pat.rast
index 4b401b60df..c85a685991 100644
--- a/crates/parser/test_data/parser/inline/ok/0166_half_open_range_pat.rast
+++ b/crates/parser/test_data/parser/inline/ok/0166_half_open_range_pat.rast
@@ -46,6 +46,49 @@ SOURCE_FILE
           LITERAL
             INT_NUMBER "1u32"
           SEMICOLON ";"
+        WHITESPACE "\n\n    "
+        MATCH_EXPR
+          MATCH_KW "match"
+          WHITESPACE " "
+          LITERAL
+            INT_NUMBER "42"
+          WHITESPACE " "
+          MATCH_ARM_LIST
+            L_CURLY "{"
+            WHITESPACE "\n        "
+            MATCH_ARM
+              RANGE_PAT
+                LITERAL_PAT
+                  LITERAL
+                    INT_NUMBER "0"
+                WHITESPACE " "
+                DOT2 ".."
+              WHITESPACE " "
+              MATCH_GUARD
+                IF_KW "if"
+                WHITESPACE " "
+                LITERAL
+                  TRUE_KW "true"
+              WHITESPACE " "
+              FAT_ARROW "=>"
+              WHITESPACE " "
+              TUPLE_EXPR
+                L_PAREN "("
+                R_PAREN ")"
+              COMMA ","
+            WHITESPACE "\n        "
+            MATCH_ARM
+              WILDCARD_PAT
+                UNDERSCORE "_"
+              WHITESPACE " "
+              FAT_ARROW "=>"
+              WHITESPACE " "
+              TUPLE_EXPR
+                L_PAREN "("
+                R_PAREN ")"
+              COMMA ","
+            WHITESPACE "\n    "
+            R_CURLY "}"
         WHITESPACE "\n"
         R_CURLY "}"
   WHITESPACE "\n"
diff --git a/crates/parser/test_data/parser/inline/ok/0166_half_open_range_pat.rs b/crates/parser/test_data/parser/inline/ok/0166_half_open_range_pat.rs
index c9386a221a..f7e2d07922 100644
--- a/crates/parser/test_data/parser/inline/ok/0166_half_open_range_pat.rs
+++ b/crates/parser/test_data/parser/inline/ok/0166_half_open_range_pat.rs
@@ -1,4 +1,9 @@
 fn f() {
     let 0 .. = 1u32;
     let 0..: _ = 1u32;
+
+    match 42 {
+        0 .. if true => (),
+        _ => (),
+    }
 }
diff --git a/crates/parser/test_data/parser/inline/ok/0203_closure_body_underscore_assignment.rast b/crates/parser/test_data/parser/inline/ok/0203_closure_body_underscore_assignment.rast
new file mode 100644
index 0000000000..8970922c97
--- /dev/null
+++ b/crates/parser/test_data/parser/inline/ok/0203_closure_body_underscore_assignment.rast
@@ -0,0 +1,32 @@
+SOURCE_FILE
+  FN
+    FN_KW "fn"
+    WHITESPACE " "
+    NAME
+      IDENT "main"
+    PARAM_LIST
+      L_PAREN "("
+      R_PAREN ")"
+    WHITESPACE " "
+    BLOCK_EXPR
+      STMT_LIST
+        L_CURLY "{"
+        WHITESPACE " "
+        EXPR_STMT
+          CLOSURE_EXPR
+            PARAM_LIST
+              PIPE "|"
+              PIPE "|"
+            WHITESPACE " "
+            BIN_EXPR
+              UNDERSCORE_EXPR
+                UNDERSCORE "_"
+              WHITESPACE " "
+              EQ "="
+              WHITESPACE " "
+              LITERAL
+                INT_NUMBER "0"
+          SEMICOLON ";"
+        WHITESPACE " "
+        R_CURLY "}"
+  WHITESPACE "\n"
diff --git a/crates/parser/test_data/parser/inline/ok/0203_closure_body_underscore_assignment.rs b/crates/parser/test_data/parser/inline/ok/0203_closure_body_underscore_assignment.rs
new file mode 100644
index 0000000000..9a34b63d29
--- /dev/null
+++ b/crates/parser/test_data/parser/inline/ok/0203_closure_body_underscore_assignment.rs
@@ -0,0 +1 @@
+fn main() { || _ = 0; }
diff --git a/crates/parser/test_data/parser/inline/ok/0204_yeet_expr.rast b/crates/parser/test_data/parser/inline/ok/0204_yeet_expr.rast
new file mode 100644
index 0000000000..24931bfcd7
--- /dev/null
+++ b/crates/parser/test_data/parser/inline/ok/0204_yeet_expr.rast
@@ -0,0 +1,31 @@
+SOURCE_FILE
+  FN
+    FN_KW "fn"
+    WHITESPACE " "
+    NAME
+      IDENT "foo"
+    PARAM_LIST
+      L_PAREN "("
+      R_PAREN ")"
+    WHITESPACE " "
+    BLOCK_EXPR
+      STMT_LIST
+        L_CURLY "{"
+        WHITESPACE "\n    "
+        EXPR_STMT
+          YEET_EXPR
+            DO_KW "do"
+            WHITESPACE " "
+            YEET_KW "yeet"
+          SEMICOLON ";"
+        WHITESPACE "\n    "
+        YEET_EXPR
+          DO_KW "do"
+          WHITESPACE " "
+          YEET_KW "yeet"
+          WHITESPACE " "
+          LITERAL
+            INT_NUMBER "1"
+        WHITESPACE "\n"
+        R_CURLY "}"
+  WHITESPACE "\n"
diff --git a/crates/parser/test_data/parser/inline/ok/0204_yeet_expr.rs b/crates/parser/test_data/parser/inline/ok/0204_yeet_expr.rs
new file mode 100644
index 0000000000..624f86c9dc
--- /dev/null
+++ b/crates/parser/test_data/parser/inline/ok/0204_yeet_expr.rs
@@ -0,0 +1,4 @@
+fn foo() {
+    do yeet;
+    do yeet 1
+}
diff --git a/crates/proc-macro-api/src/lib.rs b/crates/proc-macro-api/src/lib.rs
index a3ea05f4af..7921fda331 100644
--- a/crates/proc-macro-api/src/lib.rs
+++ b/crates/proc-macro-api/src/lib.rs
@@ -60,7 +60,7 @@ impl MacroDylib {
 
         let info = version::read_dylib_info(&path)?;
         if info.version.0 < 1 || info.version.1 < 47 {
-            let msg = format!("proc-macro {} built by {:#?} is not supported by rust-analyzer, please update your Rust version.", path.display(), info);
+            let msg = format!("proc-macro {} built by {info:#?} is not supported by rust-analyzer, please update your Rust version.", path.display());
             return Err(io::Error::new(io::ErrorKind::InvalidData, msg));
         }
 
diff --git a/crates/proc-macro-api/src/msg/flat.rs b/crates/proc-macro-api/src/msg/flat.rs
index 268a03bb53..b178c46263 100644
--- a/crates/proc-macro-api/src/msg/flat.rs
+++ b/crates/proc-macro-api/src/msg/flat.rs
@@ -137,7 +137,7 @@ impl SubtreeRepr {
             1 => Some(tt::DelimiterKind::Parenthesis),
             2 => Some(tt::DelimiterKind::Brace),
             3 => Some(tt::DelimiterKind::Bracket),
-            other => panic!("bad kind {}", other),
+            other => panic!("bad kind {other}"),
         };
         SubtreeRepr { id: TokenId(id), kind, tt: [lo, len] }
     }
@@ -164,7 +164,7 @@ impl PunctRepr {
         let spacing = match spacing {
             0 => tt::Spacing::Alone,
             1 => tt::Spacing::Joint,
-            other => panic!("bad spacing {}", other),
+            other => panic!("bad spacing {other}"),
         };
         PunctRepr { id: TokenId(id), char: char.try_into().unwrap(), spacing }
     }
@@ -210,7 +210,7 @@ impl<'a> Writer<'a> {
             let idx_tag = match child {
                 tt::TokenTree::Subtree(it) => {
                     let idx = self.enqueue(it);
-                    idx << 2 | 0b00
+                    idx << 2
                 }
                 tt::TokenTree::Leaf(leaf) => match leaf {
                     tt::Leaf::Literal(lit) => {
@@ -312,7 +312,7 @@ impl Reader {
                                 })
                                 .into()
                             }
-                            other => panic!("bad tag: {}", other),
+                            other => panic!("bad tag: {other}"),
                         }
                     })
                     .collect(),
diff --git a/crates/proc-macro-api/src/process.rs b/crates/proc-macro-api/src/process.rs
index c4018d3b39..54dcb17f4e 100644
--- a/crates/proc-macro-api/src/process.rs
+++ b/crates/proc-macro-api/src/process.rs
@@ -67,7 +67,7 @@ impl Process {
         args: impl IntoIterator<Item = impl AsRef<OsStr>>,
     ) -> io::Result<Process> {
         let args: Vec<OsString> = args.into_iter().map(|s| s.as_ref().into()).collect();
-        let child = JodChild(mk_child(&path, &args)?);
+        let child = JodChild(mk_child(&path, args)?);
         Ok(Process { child })
     }
 
diff --git a/crates/proc-macro-api/src/version.rs b/crates/proc-macro-api/src/version.rs
index 030531b80d..40125c2a51 100644
--- a/crates/proc-macro-api/src/version.rs
+++ b/crates/proc-macro-api/src/version.rs
@@ -125,7 +125,7 @@ pub fn read_version(dylib_path: &AbsPath) -> io::Result<String> {
         _ => {
             return Err(io::Error::new(
                 io::ErrorKind::InvalidData,
-                format!("unsupported metadata version {}", version),
+                format!("unsupported metadata version {version}"),
             ));
         }
     }
diff --git a/crates/proc-macro-srv/src/abis/abi_1_58/proc_macro/bridge/client.rs b/crates/proc-macro-srv/src/abis/abi_1_58/proc_macro/bridge/client.rs
index ed0e91da36..e78842f5c3 100644
--- a/crates/proc-macro-srv/src/abis/abi_1_58/proc_macro/bridge/client.rs
+++ b/crates/proc-macro-srv/src/abis/abi_1_58/proc_macro/bridge/client.rs
@@ -286,7 +286,7 @@ impl BridgeState<'_> {
         BRIDGE_STATE.with(|state| {
             state.replace(BridgeState::InUse, |mut state| {
                 // FIXME(#52812) pass `f` directly to `replace` when `RefMutL` is gone
-                f(&mut *state)
+                f(&mut state)
             })
         })
     }
diff --git a/crates/proc-macro-srv/src/abis/abi_1_58/proc_macro/mod.rs b/crates/proc-macro-srv/src/abis/abi_1_58/proc_macro/mod.rs
index a405497f3c..c5145d00e3 100644
--- a/crates/proc-macro-srv/src/abis/abi_1_58/proc_macro/mod.rs
+++ b/crates/proc-macro-srv/src/abis/abi_1_58/proc_macro/mod.rs
@@ -877,7 +877,7 @@ impl Literal {
     /// example if it is infinity or NaN this function will panic.
     pub fn f32_unsuffixed(n: f32) -> Literal {
         if !n.is_finite() {
-            panic!("Invalid float literal {}", n);
+            panic!("Invalid float literal {n}");
         }
         let mut repr = n.to_string();
         if !repr.contains('.') {
@@ -901,7 +901,7 @@ impl Literal {
     /// example if it is infinity or NaN this function will panic.
     pub fn f32_suffixed(n: f32) -> Literal {
         if !n.is_finite() {
-            panic!("Invalid float literal {}", n);
+            panic!("Invalid float literal {n}");
         }
         Literal(bridge::client::Literal::f32(&n.to_string()))
     }
@@ -920,7 +920,7 @@ impl Literal {
     /// example if it is infinity or NaN this function will panic.
     pub fn f64_unsuffixed(n: f64) -> Literal {
         if !n.is_finite() {
-            panic!("Invalid float literal {}", n);
+            panic!("Invalid float literal {n}");
         }
         let mut repr = n.to_string();
         if !repr.contains('.') {
@@ -944,7 +944,7 @@ impl Literal {
     /// example if it is infinity or NaN this function will panic.
     pub fn f64_suffixed(n: f64) -> Literal {
         if !n.is_finite() {
-            panic!("Invalid float literal {}", n);
+            panic!("Invalid float literal {n}");
         }
         Literal(bridge::client::Literal::f64(&n.to_string()))
     }
diff --git a/crates/proc-macro-srv/src/abis/abi_1_58/ra_server.rs b/crates/proc-macro-srv/src/abis/abi_1_58/ra_server.rs
index b1e982f477..22d4ad94f7 100644
--- a/crates/proc-macro-srv/src/abis/abi_1_58/ra_server.rs
+++ b/crates/proc-macro-srv/src/abis/abi_1_58/ra_server.rs
@@ -471,8 +471,12 @@ impl server::Punct for RustAnalyzer {
 }
 
 impl server::Ident for RustAnalyzer {
-    fn new(&mut self, string: &str, span: Self::Span, _is_raw: bool) -> Self::Ident {
-        IdentId(self.ident_interner.intern(&IdentData(tt::Ident { text: string.into(), id: span })))
+    fn new(&mut self, string: &str, span: Self::Span, is_raw: bool) -> Self::Ident {
+        IdentId(self.ident_interner.intern(&IdentData(tt::Ident::new_with_is_raw(
+            string.into(),
+            span,
+            is_raw,
+        ))))
     }
 
     fn span(&mut self, ident: Self::Ident) -> Self::Span {
@@ -544,13 +548,13 @@ impl server::Literal for RustAnalyzer {
 
     fn f32(&mut self, n: &str) -> Self::Literal {
         let n: f32 = n.parse().unwrap();
-        let text = format!("{}f32", n);
+        let text = format!("{n}f32");
         Literal { text: text.into(), id: tt::TokenId::unspecified() }
     }
 
     fn f64(&mut self, n: &str) -> Self::Literal {
         let n: f64 = n.parse().unwrap();
-        let text = format!("{}f64", n);
+        let text = format!("{n}f64");
         Literal { text: text.into(), id: tt::TokenId::unspecified() }
     }
 
@@ -559,11 +563,11 @@ impl server::Literal for RustAnalyzer {
         for ch in string.chars() {
             escaped.extend(ch.escape_debug());
         }
-        Literal { text: format!("\"{}\"", escaped).into(), id: tt::TokenId::unspecified() }
+        Literal { text: format!("\"{escaped}\"").into(), id: tt::TokenId::unspecified() }
     }
 
     fn character(&mut self, ch: char) -> Self::Literal {
-        Literal { text: format!("'{}'", ch).into(), id: tt::TokenId::unspecified() }
+        Literal { text: format!("'{ch}'").into(), id: tt::TokenId::unspecified() }
     }
 
     fn byte_string(&mut self, bytes: &[u8]) -> Self::Literal {
@@ -574,7 +578,7 @@ impl server::Literal for RustAnalyzer {
             .map(Into::<char>::into)
             .collect::<String>();
 
-        Literal { text: format!("b\"{}\"", string).into(), id: tt::TokenId::unspecified() }
+        Literal { text: format!("b\"{string}\"").into(), id: tt::TokenId::unspecified() }
     }
 
     fn span(&mut self, literal: &Self::Literal) -> Self::Span {
diff --git a/crates/proc-macro-srv/src/abis/abi_1_63/proc_macro/bridge/client.rs b/crates/proc-macro-srv/src/abis/abi_1_63/proc_macro/bridge/client.rs
index 102027d14a..b346c2c189 100644
--- a/crates/proc-macro-srv/src/abis/abi_1_63/proc_macro/bridge/client.rs
+++ b/crates/proc-macro-srv/src/abis/abi_1_63/proc_macro/bridge/client.rs
@@ -301,7 +301,7 @@ impl BridgeState<'_> {
         BRIDGE_STATE.with(|state| {
             state.replace(BridgeState::InUse, |mut state| {
                 // FIXME(#52812) pass `f` directly to `replace` when `RefMutL` is gone
-                f(&mut *state)
+                f(&mut state)
             })
         })
     }
diff --git a/crates/proc-macro-srv/src/abis/abi_1_63/ra_server.rs b/crates/proc-macro-srv/src/abis/abi_1_63/ra_server.rs
index ed49cc7596..f82f20c37b 100644
--- a/crates/proc-macro-srv/src/abis/abi_1_63/ra_server.rs
+++ b/crates/proc-macro-srv/src/abis/abi_1_63/ra_server.rs
@@ -486,8 +486,12 @@ impl server::Punct for RustAnalyzer {
 }
 
 impl server::Ident for RustAnalyzer {
-    fn new(&mut self, string: &str, span: Self::Span, _is_raw: bool) -> Self::Ident {
-        IdentId(self.ident_interner.intern(&IdentData(tt::Ident { text: string.into(), id: span })))
+    fn new(&mut self, string: &str, span: Self::Span, is_raw: bool) -> Self::Ident {
+        IdentId(self.ident_interner.intern(&IdentData(tt::Ident::new_with_is_raw(
+            string.into(),
+            span,
+            is_raw,
+        ))))
     }
 
     fn span(&mut self, ident: Self::Ident) -> Self::Span {
@@ -559,13 +563,13 @@ impl server::Literal for RustAnalyzer {
 
     fn f32(&mut self, n: &str) -> Self::Literal {
         let n: f32 = n.parse().unwrap();
-        let text = format!("{}f32", n);
+        let text = format!("{n}f32");
         Literal { text: text.into(), id: tt::TokenId::unspecified() }
     }
 
     fn f64(&mut self, n: &str) -> Self::Literal {
         let n: f64 = n.parse().unwrap();
-        let text = format!("{}f64", n);
+        let text = format!("{n}f64");
         Literal { text: text.into(), id: tt::TokenId::unspecified() }
     }
 
@@ -574,11 +578,11 @@ impl server::Literal for RustAnalyzer {
         for ch in string.chars() {
             escaped.extend(ch.escape_debug());
         }
-        Literal { text: format!("\"{}\"", escaped).into(), id: tt::TokenId::unspecified() }
+        Literal { text: format!("\"{escaped}\"").into(), id: tt::TokenId::unspecified() }
     }
 
     fn character(&mut self, ch: char) -> Self::Literal {
-        Literal { text: format!("'{}'", ch).into(), id: tt::TokenId::unspecified() }
+        Literal { text: format!("'{ch}'").into(), id: tt::TokenId::unspecified() }
     }
 
     fn byte_string(&mut self, bytes: &[u8]) -> Self::Literal {
@@ -589,7 +593,7 @@ impl server::Literal for RustAnalyzer {
             .map(Into::<char>::into)
             .collect::<String>();
 
-        Literal { text: format!("b\"{}\"", string).into(), id: tt::TokenId::unspecified() }
+        Literal { text: format!("b\"{string}\"").into(), id: tt::TokenId::unspecified() }
     }
 
     fn span(&mut self, literal: &Self::Literal) -> Self::Span {
diff --git a/crates/proc-macro-srv/src/abis/abi_sysroot/ra_server.rs b/crates/proc-macro-srv/src/abis/abi_sysroot/ra_server.rs
index e4e43e97dd..068f79f824 100644
--- a/crates/proc-macro-srv/src/abis/abi_sysroot/ra_server.rs
+++ b/crates/proc-macro-srv/src/abis/abi_sysroot/ra_server.rs
@@ -107,8 +107,8 @@ impl server::TokenStream for RustAnalyzer {
             }
 
             bridge::TokenTree::Ident(ident) => {
-                // FIXME: handle raw idents
                 let text = ident.sym.text();
+                let text = if ident.is_raw { tt::SmolStr::from_iter(["r#", &text]) } else { text };
                 let ident: tt::Ident = tt::Ident { text, id: ident.span };
                 let leaf = tt::Leaf::from(ident);
                 let tree = TokenTree::from(leaf);
@@ -182,9 +182,8 @@ impl server::TokenStream for RustAnalyzer {
             .map(|tree| match tree {
                 tt::TokenTree::Leaf(tt::Leaf::Ident(ident)) => {
                     bridge::TokenTree::Ident(bridge::Ident {
-                        sym: Symbol::intern(&ident.text),
-                        // FIXME: handle raw idents
-                        is_raw: false,
+                        sym: Symbol::intern(ident.text.trim_start_matches("r#")),
+                        is_raw: ident.text.starts_with("r#"),
                         span: ident.id,
                     })
                 }
diff --git a/crates/proc-macro-srv/src/abis/mod.rs b/crates/proc-macro-srv/src/abis/mod.rs
index 0ce099ae0b..5b8aca4d81 100644
--- a/crates/proc-macro-srv/src/abis/mod.rs
+++ b/crates/proc-macro-srv/src/abis/mod.rs
@@ -117,7 +117,7 @@ impl Abi {
                 let inner = unsafe { Abi_1_63::from_lib(lib, symbol_name) }?;
                 Ok(Abi::Abi1_63(inner))
             }
-            _ => Err(LoadProcMacroDylibError::UnsupportedABI(info.version_string.clone())),
+            _ => Err(LoadProcMacroDylibError::UnsupportedABI(info.version_string)),
         }
     }
 
diff --git a/crates/proc-macro-srv/src/lib.rs b/crates/proc-macro-srv/src/lib.rs
index b4f5ebd157..2eb939a7ce 100644
--- a/crates/proc-macro-srv/src/lib.rs
+++ b/crates/proc-macro-srv/src/lib.rs
@@ -48,7 +48,7 @@ impl ProcMacroSrv {
     pub fn expand(&mut self, task: ExpandMacro) -> Result<FlatTree, PanicMessage> {
         let expander = self.expander(task.lib.as_ref()).map_err(|err| {
             debug_assert!(false, "should list macros before asking to expand");
-            PanicMessage(format!("failed to load macro: {}", err))
+            PanicMessage(format!("failed to load macro: {err}"))
         })?;
 
         let prev_env = EnvSnapshot::new();
@@ -59,7 +59,7 @@ impl ProcMacroSrv {
             Some(dir) => {
                 let prev_working_dir = std::env::current_dir().ok();
                 if let Err(err) = std::env::set_current_dir(&dir) {
-                    eprintln!("Failed to set the current working dir to {}. Error: {:?}", dir, err)
+                    eprintln!("Failed to set the current working dir to {dir}. Error: {err:?}")
                 }
                 prev_working_dir
             }
@@ -112,14 +112,16 @@ impl ProcMacroSrv {
     }
 
     fn expander(&mut self, path: &Path) -> Result<&dylib::Expander, String> {
-        let time = fs::metadata(path).and_then(|it| it.modified()).map_err(|err| {
-            format!("Failed to get file metadata for {}: {}", path.display(), err)
-        })?;
+        let time = fs::metadata(path)
+            .and_then(|it| it.modified())
+            .map_err(|err| format!("Failed to get file metadata for {}: {err}", path.display()))?;
 
         Ok(match self.expanders.entry((path.to_path_buf(), time)) {
-            Entry::Vacant(v) => v.insert(dylib::Expander::new(path).map_err(|err| {
-                format!("Cannot create expander for {}: {}", path.display(), err)
-            })?),
+            Entry::Vacant(v) => {
+                v.insert(dylib::Expander::new(path).map_err(|err| {
+                    format!("Cannot create expander for {}: {err}", path.display())
+                })?)
+            }
             Entry::Occupied(e) => e.into_mut(),
         })
     }
diff --git a/crates/proc-macro-srv/src/tests/mod.rs b/crates/proc-macro-srv/src/tests/mod.rs
index cc0fc91fe9..1ccc170f42 100644
--- a/crates/proc-macro-srv/src/tests/mod.rs
+++ b/crates/proc-macro-srv/src/tests/mod.rs
@@ -63,7 +63,7 @@ fn test_fn_like_macro_clone_raw_ident() {
         "r#async",
         expect![[r#"
             SUBTREE $
-              IDENT   async 4294967295"#]],
+              IDENT   r#async 4294967295"#]],
     );
 }
 
@@ -86,15 +86,13 @@ fn test_fn_like_mk_literals() {
 
 #[test]
 fn test_fn_like_mk_idents() {
-    // FIXME: this test is wrong: raw should be 'r#raw' but ABIs 1.64 and below
-    // simply ignore `is_raw` when implementing the `Ident` interface.
     assert_expand(
         "fn_like_mk_idents",
         r#""#,
         expect![[r#"
             SUBTREE $
               IDENT   standard 4294967295
-              IDENT   raw 4294967295"#]],
+              IDENT   r#raw 4294967295"#]],
     );
 }
 
diff --git a/crates/proc-macro-srv/src/tests/utils.rs b/crates/proc-macro-srv/src/tests/utils.rs
index 44b1b6588d..efbeb90ca9 100644
--- a/crates/proc-macro-srv/src/tests/utils.rs
+++ b/crates/proc-macro-srv/src/tests/utils.rs
@@ -30,12 +30,12 @@ fn assert_expand_impl(macro_name: &str, input: &str, attr: Option<&str>, expect:
     let attr = attr.map(|attr| parse_string(attr).unwrap().into_subtree());
 
     let res = expander.expand(macro_name, &fixture.into_subtree(), attr.as_ref()).unwrap();
-    expect.assert_eq(&format!("{:?}", res));
+    expect.assert_eq(&format!("{res:?}"));
 }
 
 pub(crate) fn list() -> Vec<String> {
     let dylib_path = proc_macro_test_dylib_path();
     let mut srv = ProcMacroSrv::default();
     let res = srv.list_macros(&dylib_path).unwrap();
-    res.into_iter().map(|(name, kind)| format!("{} [{:?}]", name, kind)).collect()
+    res.into_iter().map(|(name, kind)| format!("{name} [{kind:?}]")).collect()
 }
diff --git a/crates/proc-macro-test/build.rs b/crates/proc-macro-test/build.rs
index a80c962617..19a5caa4cc 100644
--- a/crates/proc-macro-test/build.rs
+++ b/crates/proc-macro-test/build.rs
@@ -63,7 +63,7 @@ fn main() {
     };
 
     cmd.current_dir(&staging_dir)
-        .args(&["build", "-p", "proc-macro-test-impl", "--message-format", "json"])
+        .args(["build", "-p", "proc-macro-test-impl", "--message-format", "json"])
         // Explicit override the target directory to avoid using the same one which the parent
         // cargo is using, or we'll deadlock.
         // This can happen when `CARGO_TARGET_DIR` is set or global config forces all cargo
@@ -71,7 +71,7 @@ fn main() {
         .arg("--target-dir")
         .arg(&target_dir);
 
-    println!("Running {:?}", cmd);
+    println!("Running {cmd:?}");
 
     let output = cmd.output().unwrap();
     if !output.status.success() {
@@ -85,16 +85,13 @@ fn main() {
 
     let mut artifact_path = None;
     for message in Message::parse_stream(output.stdout.as_slice()) {
-        match message.unwrap() {
-            Message::CompilerArtifact(artifact) => {
-                if artifact.target.kind.contains(&"proc-macro".to_string()) {
-                    let repr = format!("{} {}", name, version);
-                    if artifact.package_id.repr.starts_with(&repr) {
-                        artifact_path = Some(PathBuf::from(&artifact.filenames[0]));
-                    }
+        if let Message::CompilerArtifact(artifact) = message.unwrap() {
+            if artifact.target.kind.contains(&"proc-macro".to_string()) {
+                let repr = format!("{name} {version}");
+                if artifact.package_id.repr.starts_with(&repr) {
+                    artifact_path = Some(PathBuf::from(&artifact.filenames[0]));
                 }
             }
-            _ => (), // Unknown message
         }
     }
 
diff --git a/crates/profile/src/hprof.rs b/crates/profile/src/hprof.rs
index b562c193e7..ea89a89c5c 100644
--- a/crates/profile/src/hprof.rs
+++ b/crates/profile/src/hprof.rs
@@ -133,7 +133,7 @@ static FILTER: Lazy<RwLock<Filter>> = Lazy::new(Default::default);
 
 fn with_profile_stack<T>(f: impl FnOnce(&mut ProfileStack) -> T) -> T {
     thread_local!(static STACK: RefCell<ProfileStack> = RefCell::new(ProfileStack::new()));
-    STACK.with(|it| f(&mut *it.borrow_mut()))
+    STACK.with(|it| f(&mut it.borrow_mut()))
 }
 
 #[derive(Default, Clone, Debug)]
@@ -238,7 +238,7 @@ impl ProfileStack {
             self.heartbeat(frame.heartbeats);
             let avg_span = duration / (frame.heartbeats + 1);
             if avg_span > self.filter.heartbeat_longer_than {
-                eprintln!("Too few heartbeats {} ({}/{:?})?", label, frame.heartbeats, duration);
+                eprintln!("Too few heartbeats {label} ({}/{duration:?})?", frame.heartbeats);
             }
         }
 
@@ -275,7 +275,7 @@ fn print(
     out: &mut impl Write,
 ) {
     let current_indent = "    ".repeat(level as usize);
-    let detail = tree[curr].detail.as_ref().map(|it| format!(" @ {}", it)).unwrap_or_default();
+    let detail = tree[curr].detail.as_ref().map(|it| format!(" @ {it}")).unwrap_or_default();
     writeln!(
         out,
         "{}{} - {}{}",
@@ -302,13 +302,13 @@ fn print(
     }
 
     for (child_msg, (duration, count)) in &short_children {
-        writeln!(out, "    {}{} - {} ({} calls)", current_indent, ms(*duration), child_msg, count)
+        writeln!(out, "    {current_indent}{} - {child_msg} ({count} calls)", ms(*duration))
             .expect("printing profiling info");
     }
 
     let unaccounted = tree[curr].duration - accounted_for;
     if tree.children(curr).next().is_some() && unaccounted > longer_than {
-        writeln!(out, "    {}{} - ???", current_indent, ms(unaccounted))
+        writeln!(out, "    {current_indent}{} - ???", ms(unaccounted))
             .expect("printing profiling info");
     }
 }
@@ -320,7 +320,7 @@ impl fmt::Display for ms {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self.0.as_millis() {
             0 => f.write_str("    0  "),
-            n => write!(f, "{:5}ms", n),
+            n => write!(f, "{n:5}ms"),
         }
     }
 }
diff --git a/crates/profile/src/lib.rs b/crates/profile/src/lib.rs
index 00f7952e80..7ca3c7d629 100644
--- a/crates/profile/src/lib.rs
+++ b/crates/profile/src/lib.rs
@@ -114,11 +114,11 @@ impl Drop for CpuSpan {
             match out {
                 Ok(out) if out.status.success() => {
                     let svg = profile_data.with_extension("svg");
-                    std::fs::write(&svg, &out.stdout).unwrap();
+                    std::fs::write(&svg, out.stdout).unwrap();
                     eprintln!("Profile rendered to:\n\n    {}\n", svg.display());
                 }
                 _ => {
-                    eprintln!("Failed to run:\n\n   {:?}\n", cmd);
+                    eprintln!("Failed to run:\n\n   {cmd:?}\n");
                 }
             }
         }
diff --git a/crates/profile/src/memory_usage.rs b/crates/profile/src/memory_usage.rs
index ee882b4cb4..8017f86579 100644
--- a/crates/profile/src/memory_usage.rs
+++ b/crates/profile/src/memory_usage.rs
@@ -109,7 +109,7 @@ impl fmt::Display for Bytes {
                 suffix = "mb";
             }
         }
-        f.pad(&format!("{}{}", value, suffix))
+        f.pad(&format!("{value}{suffix}"))
     }
 }
 
diff --git a/crates/profile/src/stop_watch.rs b/crates/profile/src/stop_watch.rs
index 6258328482..71303d5a63 100644
--- a/crates/profile/src/stop_watch.rs
+++ b/crates/profile/src/stop_watch.rs
@@ -33,11 +33,11 @@ impl StopWatch {
             if *PERF_ENABLED {
                 let mut counter = perf_event::Builder::new()
                     .build()
-                    .map_err(|err| eprintln!("Failed to create perf counter: {}", err))
+                    .map_err(|err| eprintln!("Failed to create perf counter: {err}"))
                     .ok();
                 if let Some(counter) = &mut counter {
                     if let Err(err) = counter.enable() {
-                        eprintln!("Failed to start perf counter: {}", err)
+                        eprintln!("Failed to start perf counter: {err}")
                     }
                 }
                 counter
@@ -64,7 +64,7 @@ impl StopWatch {
 
         #[cfg(target_os = "linux")]
         let instructions = self.counter.as_mut().and_then(|it| {
-            it.read().map_err(|err| eprintln!("Failed to read perf counter: {}", err)).ok()
+            it.read().map_err(|err| eprintln!("Failed to read perf counter: {err}")).ok()
         });
         #[cfg(not(target_os = "linux"))]
         let instructions = None;
@@ -91,10 +91,10 @@ impl fmt::Display for StopWatchSpan {
                 instructions /= 1000;
                 prefix = "g";
             }
-            write!(f, ", {}{}instr", instructions, prefix)?;
+            write!(f, ", {instructions}{prefix}instr")?;
         }
         if let Some(memory) = self.memory {
-            write!(f, ", {}", memory)?;
+            write!(f, ", {memory}")?;
         }
         Ok(())
     }
diff --git a/crates/project-model/src/build_scripts.rs b/crates/project-model/src/build_scripts.rs
index ae2b41f27d..6550cf27e9 100644
--- a/crates/project-model/src/build_scripts.rs
+++ b/crates/project-model/src/build_scripts.rs
@@ -66,7 +66,7 @@ impl WorkspaceBuildScripts {
             _ => {
                 let mut cmd = Command::new(toolchain::cargo());
 
-                cmd.args(&["check", "--quiet", "--workspace", "--message-format=json"]);
+                cmd.args(["check", "--quiet", "--workspace", "--message-format=json"]);
 
                 // --all-targets includes tests, benches and examples in addition to the
                 // default lib and bins. This is an independent concept from the --target
@@ -74,7 +74,7 @@ impl WorkspaceBuildScripts {
                 cmd.arg("--all-targets");
 
                 if let Some(target) = &config.target {
-                    cmd.args(&["--target", target]);
+                    cmd.args(["--target", target]);
                 }
 
                 match &config.features {
@@ -122,7 +122,7 @@ impl WorkspaceBuildScripts {
             InvocationLocation::Root(root) if config.run_build_script_command.is_some() => {
                 root.as_path()
             }
-            _ => &workspace.workspace_root(),
+            _ => workspace.workspace_root(),
         }
         .as_ref();
 
@@ -133,7 +133,7 @@ impl WorkspaceBuildScripts {
                 // building build scripts failed, attempt to build with --keep-going so
                 // that we potentially get more build data
                 let mut cmd = Self::build_command(config)?;
-                cmd.args(&["-Z", "unstable-options", "--keep-going"]).env("RUSTC_BOOTSTRAP", "1");
+                cmd.args(["-Z", "unstable-options", "--keep-going"]).env("RUSTC_BOOTSTRAP", "1");
                 let mut res = Self::run_per_ws(cmd, workspace, current_dir, progress)?;
                 res.error = Some(error);
                 Ok(res)
@@ -295,7 +295,7 @@ impl WorkspaceBuildScripts {
                 match message {
                     Message::BuildScriptExecuted(mut message) => {
                         with_output_for(&message.package_id.repr, &mut |name, data| {
-                            progress(format!("running build-script: {}", name));
+                            progress(format!("running build-script: {name}"));
                             let cfgs = {
                                 let mut acc = Vec::new();
                                 for cfg in &message.cfgs {
@@ -303,8 +303,7 @@ impl WorkspaceBuildScripts {
                                         Ok(it) => acc.push(it),
                                         Err(err) => {
                                             push_err(&format!(
-                                                "invalid cfg from cargo-metadata: {}",
-                                                err
+                                                "invalid cfg from cargo-metadata: {err}"
                                             ));
                                             return;
                                         }
@@ -334,7 +333,7 @@ impl WorkspaceBuildScripts {
                     }
                     Message::CompilerArtifact(message) => {
                         with_output_for(&message.package_id.repr, &mut |name, data| {
-                            progress(format!("building proc-macros: {}", name));
+                            progress(format!("building proc-macros: {name}"));
                             if message.target.kind.iter().any(|k| k == "proc-macro") {
                                 // Skip rmeta file
                                 if let Some(filename) =
diff --git a/crates/project-model/src/cargo_workspace.rs b/crates/project-model/src/cargo_workspace.rs
index 02ec7a4f6f..467cf09178 100644
--- a/crates/project-model/src/cargo_workspace.rs
+++ b/crates/project-model/src/cargo_workspace.rs
@@ -411,7 +411,7 @@ impl CargoWorkspace {
         CargoWorkspace { packages, targets, workspace_root }
     }
 
-    pub fn packages<'a>(&'a self) -> impl Iterator<Item = Package> + ExactSizeIterator + 'a {
+    pub fn packages(&self) -> impl Iterator<Item = Package> + ExactSizeIterator + '_ {
         self.packages.iter().map(|(id, _pkg)| id)
     }
 
@@ -427,7 +427,7 @@ impl CargoWorkspace {
     }
 
     pub fn package_flag(&self, package: &PackageData) -> String {
-        if self.is_unique(&*package.name) {
+        if self.is_unique(&package.name) {
             package.name.clone()
         } else {
             format!("{}:{}", package.name, package.version)
@@ -517,7 +517,7 @@ fn cargo_config_build_target(
     cargo_config.envs(extra_env);
     cargo_config
         .current_dir(cargo_toml.parent())
-        .args(&["-Z", "unstable-options", "config", "get", "build.target"])
+        .args(["-Z", "unstable-options", "config", "get", "build.target"])
         .env("RUSTC_BOOTSTRAP", "1");
     // if successful we receive `build.target = "target-triple"`
     // or `build.target = ["<target 1>", ..]`
diff --git a/crates/project-model/src/cfg_flag.rs b/crates/project-model/src/cfg_flag.rs
index f3dd8f5133..c134b78ab3 100644
--- a/crates/project-model/src/cfg_flag.rs
+++ b/crates/project-model/src/cfg_flag.rs
@@ -17,7 +17,7 @@ impl FromStr for CfgFlag {
         let res = match s.split_once('=') {
             Some((key, value)) => {
                 if !(value.starts_with('"') && value.ends_with('"')) {
-                    return Err(format!("Invalid cfg ({:?}), value should be in quotes", s));
+                    return Err(format!("Invalid cfg ({s:?}), value should be in quotes"));
                 }
                 let key = key.to_string();
                 let value = value[1..value.len() - 1].to_string();
diff --git a/crates/project-model/src/lib.rs b/crates/project-model/src/lib.rs
index 575581fa54..e2f09bad2d 100644
--- a/crates/project-model/src/lib.rs
+++ b/crates/project-model/src/lib.rs
@@ -25,6 +25,7 @@ mod sysroot;
 mod workspace;
 mod rustc_cfg;
 mod build_scripts;
+mod target_data_layout;
 
 #[cfg(test)]
 mod tests;
@@ -145,7 +146,7 @@ impl ProjectManifest {
 }
 
 fn utf8_stdout(mut cmd: Command) -> Result<String> {
-    let output = cmd.output().with_context(|| format!("{:?} failed", cmd))?;
+    let output = cmd.output().with_context(|| format!("{cmd:?} failed"))?;
     if !output.status.success() {
         match String::from_utf8(output.stderr) {
             Ok(stderr) if !stderr.is_empty() => {
diff --git a/crates/project-model/src/manifest_path.rs b/crates/project-model/src/manifest_path.rs
index 4910fd3d11..980d92d3df 100644
--- a/crates/project-model/src/manifest_path.rs
+++ b/crates/project-model/src/manifest_path.rs
@@ -40,7 +40,7 @@ impl ops::Deref for ManifestPath {
     type Target = AbsPath;
 
     fn deref(&self) -> &Self::Target {
-        &*self.file
+        &self.file
     }
 }
 
diff --git a/crates/project-model/src/project_json.rs b/crates/project-model/src/project_json.rs
index 5133a14d53..9af0eafe9f 100644
--- a/crates/project-model/src/project_json.rs
+++ b/crates/project-model/src/project_json.rs
@@ -197,5 +197,5 @@ where
     D: de::Deserializer<'de>,
 {
     let name = String::deserialize(de)?;
-    CrateName::new(&name).map_err(|err| de::Error::custom(format!("invalid crate name: {:?}", err)))
+    CrateName::new(&name).map_err(|err| de::Error::custom(format!("invalid crate name: {err:?}")))
 }
diff --git a/crates/project-model/src/rustc_cfg.rs b/crates/project-model/src/rustc_cfg.rs
index 3231361836..0066f6717e 100644
--- a/crates/project-model/src/rustc_cfg.rs
+++ b/crates/project-model/src/rustc_cfg.rs
@@ -50,10 +50,10 @@ fn get_rust_cfgs(
         cargo_config.envs(extra_env);
         cargo_config
             .current_dir(cargo_toml.parent())
-            .args(&["-Z", "unstable-options", "rustc", "--print", "cfg"])
+            .args(["rustc", "-Z", "unstable-options", "--print", "cfg"])
             .env("RUSTC_BOOTSTRAP", "1");
         if let Some(target) = target {
-            cargo_config.args(&["--target", target]);
+            cargo_config.args(["--target", target]);
         }
         match utf8_stdout(cargo_config) {
             Ok(it) => return Ok(it),
@@ -63,9 +63,9 @@ fn get_rust_cfgs(
     // using unstable cargo features failed, fall back to using plain rustc
     let mut cmd = Command::new(toolchain::rustc());
     cmd.envs(extra_env);
-    cmd.args(&["--print", "cfg", "-O"]);
+    cmd.args(["--print", "cfg", "-O"]);
     if let Some(target) = target {
-        cmd.args(&["--target", target]);
+        cmd.args(["--target", target]);
     }
     utf8_stdout(cmd)
 }
diff --git a/crates/project-model/src/sysroot.rs b/crates/project-model/src/sysroot.rs
index f6c09a27c9..8d5ab0061e 100644
--- a/crates/project-model/src/sysroot.rs
+++ b/crates/project-model/src/sysroot.rs
@@ -104,7 +104,7 @@ impl Sysroot {
 
         for path in SYSROOT_CRATES.trim().lines() {
             let name = path.split('/').last().unwrap();
-            let root = [format!("{}/src/lib.rs", path), format!("lib{}/lib.rs", path)]
+            let root = [format!("{path}/src/lib.rs"), format!("lib{path}/lib.rs")]
                 .into_iter()
                 .map(|it| sysroot.src_root.join(it))
                 .filter_map(|it| ManifestPath::try_from(it).ok())
@@ -171,7 +171,7 @@ fn discover_sysroot_dir(
 ) -> Result<AbsPathBuf> {
     let mut rustc = Command::new(toolchain::rustc());
     rustc.envs(extra_env);
-    rustc.current_dir(current_dir).args(&["--print", "sysroot"]);
+    rustc.current_dir(current_dir).args(["--print", "sysroot"]);
     tracing::debug!("Discovering sysroot by {:?}", rustc);
     let stdout = utf8_stdout(rustc)?;
     Ok(AbsPathBuf::assert(PathBuf::from(stdout)))
@@ -203,7 +203,7 @@ fn discover_sysroot_src_dir_or_add_component(
         .or_else(|| {
             let mut rustup = Command::new(toolchain::rustup());
             rustup.envs(extra_env);
-            rustup.current_dir(current_dir).args(&["component", "add", "rust-src"]);
+            rustup.current_dir(current_dir).args(["component", "add", "rust-src"]);
             tracing::info!("adding rust-src component by {:?}", rustup);
             utf8_stdout(rustup).ok()?;
             get_rust_src(sysroot_path)
diff --git a/crates/project-model/src/target_data_layout.rs b/crates/project-model/src/target_data_layout.rs
new file mode 100644
index 0000000000..40cf47c3f5
--- /dev/null
+++ b/crates/project-model/src/target_data_layout.rs
@@ -0,0 +1,40 @@
+//! Runs `rustc --print target-spec-json` to get the target_data_layout.
+use std::process::Command;
+
+use rustc_hash::FxHashMap;
+
+use crate::{utf8_stdout, ManifestPath};
+
+pub(super) fn get(
+    cargo_toml: Option<&ManifestPath>,
+    target: Option<&str>,
+    extra_env: &FxHashMap<String, String>,
+) -> Option<String> {
+    let output = (|| {
+        if let Some(cargo_toml) = cargo_toml {
+            let mut cmd = Command::new(toolchain::rustc());
+            cmd.envs(extra_env);
+            cmd.current_dir(cargo_toml.parent())
+                .args(["-Z", "unstable-options", "rustc", "--print", "target-spec-json"])
+                .env("RUSTC_BOOTSTRAP", "1");
+            if let Some(target) = target {
+                cmd.args(["--target", target]);
+            }
+            match utf8_stdout(cmd) {
+                Ok(it) => return Ok(it),
+                Err(e) => tracing::debug!("{e:?}: falling back to querying rustc for cfgs"),
+            }
+        }
+        // using unstable cargo features failed, fall back to using plain rustc
+        let mut cmd = Command::new(toolchain::rustc());
+        cmd.envs(extra_env)
+            .args(["-Z", "unstable-options", "rustc", "--print", "target-spec-json"])
+            .env("RUSTC_BOOTSTRAP", "1");
+        if let Some(target) = target {
+            cmd.args(["--target", target]);
+        }
+        utf8_stdout(cmd)
+    })()
+    .ok()?;
+    Some(output.split_once(r#""data-layout": ""#)?.1.split_once('"')?.0.to_owned())
+}
diff --git a/crates/project-model/src/tests.rs b/crates/project-model/src/tests.rs
index a1cb438bdd..2bb9ebf998 100644
--- a/crates/project-model/src/tests.rs
+++ b/crates/project-model/src/tests.rs
@@ -29,6 +29,7 @@ fn load_cargo_with_overrides(file: &str, cfg_overrides: CfgOverrides) -> CrateGr
         rustc_cfg: Vec::new(),
         cfg_overrides,
         toolchain: None,
+        target_layout: None,
     };
     to_crate_graph(project_workspace)
 }
@@ -106,7 +107,7 @@ fn to_crate_graph(project_workspace: ProjectWorkspace) -> CrateGraph {
 }
 
 fn check_crate_graph(crate_graph: CrateGraph, expect: Expect) {
-    let mut crate_graph = format!("{:#?}", crate_graph);
+    let mut crate_graph = format!("{crate_graph:#?}");
     replace_root(&mut crate_graph, false);
     expect.assert_eq(&crate_graph);
 }
@@ -150,6 +151,7 @@ fn cargo_hello_world_project_model_with_wildcard_overrides() {
                                 "debug_assertions",
                             ],
                         ),
+                        target_layout: None,
                         env: Env {
                             entries: {
                                 "CARGO_PKG_LICENSE": "",
@@ -219,6 +221,7 @@ fn cargo_hello_world_project_model_with_wildcard_overrides() {
                                 "debug_assertions",
                             ],
                         ),
+                        target_layout: None,
                         env: Env {
                             entries: {
                                 "CARGO_PKG_LICENSE": "",
@@ -297,6 +300,7 @@ fn cargo_hello_world_project_model_with_wildcard_overrides() {
                                 "debug_assertions",
                             ],
                         ),
+                        target_layout: None,
                         env: Env {
                             entries: {
                                 "CARGO_PKG_LICENSE": "",
@@ -375,6 +379,7 @@ fn cargo_hello_world_project_model_with_wildcard_overrides() {
                                 "debug_assertions",
                             ],
                         ),
+                        target_layout: None,
                         env: Env {
                             entries: {
                                 "CARGO_PKG_LICENSE": "",
@@ -462,6 +467,7 @@ fn cargo_hello_world_project_model_with_wildcard_overrides() {
                                 "feature=use_std",
                             ],
                         ),
+                        target_layout: None,
                         env: Env {
                             entries: {
                                 "CARGO_PKG_LICENSE": "",
@@ -547,6 +553,7 @@ fn cargo_hello_world_project_model_with_selective_overrides() {
                                 "test",
                             ],
                         ),
+                        target_layout: None,
                         env: Env {
                             entries: {
                                 "CARGO_PKG_LICENSE": "",
@@ -618,6 +625,7 @@ fn cargo_hello_world_project_model_with_selective_overrides() {
                                 "test",
                             ],
                         ),
+                        target_layout: None,
                         env: Env {
                             entries: {
                                 "CARGO_PKG_LICENSE": "",
@@ -698,6 +706,7 @@ fn cargo_hello_world_project_model_with_selective_overrides() {
                                 "test",
                             ],
                         ),
+                        target_layout: None,
                         env: Env {
                             entries: {
                                 "CARGO_PKG_LICENSE": "",
@@ -778,6 +787,7 @@ fn cargo_hello_world_project_model_with_selective_overrides() {
                                 "test",
                             ],
                         ),
+                        target_layout: None,
                         env: Env {
                             entries: {
                                 "CARGO_PKG_LICENSE": "",
@@ -865,6 +875,7 @@ fn cargo_hello_world_project_model_with_selective_overrides() {
                                 "feature=use_std",
                             ],
                         ),
+                        target_layout: None,
                         env: Env {
                             entries: {
                                 "CARGO_PKG_LICENSE": "",
@@ -941,6 +952,7 @@ fn cargo_hello_world_project_model() {
                                 "test",
                             ],
                         ),
+                        target_layout: None,
                         env: Env {
                             entries: {
                                 "CARGO_PKG_LICENSE": "",
@@ -1012,6 +1024,7 @@ fn cargo_hello_world_project_model() {
                                 "test",
                             ],
                         ),
+                        target_layout: None,
                         env: Env {
                             entries: {
                                 "CARGO_PKG_LICENSE": "",
@@ -1092,6 +1105,7 @@ fn cargo_hello_world_project_model() {
                                 "test",
                             ],
                         ),
+                        target_layout: None,
                         env: Env {
                             entries: {
                                 "CARGO_PKG_LICENSE": "",
@@ -1172,6 +1186,7 @@ fn cargo_hello_world_project_model() {
                                 "test",
                             ],
                         ),
+                        target_layout: None,
                         env: Env {
                             entries: {
                                 "CARGO_PKG_LICENSE": "",
@@ -1259,6 +1274,7 @@ fn cargo_hello_world_project_model() {
                                 "feature=use_std",
                             ],
                         ),
+                        target_layout: None,
                         env: Env {
                             entries: {
                                 "CARGO_PKG_LICENSE": "",
@@ -1327,6 +1343,7 @@ fn rust_project_hello_world_project_model() {
                         potential_cfg_options: CfgOptions(
                             [],
                         ),
+                        target_layout: None,
                         env: Env {
                             entries: {},
                         },
@@ -1371,6 +1388,7 @@ fn rust_project_hello_world_project_model() {
                         potential_cfg_options: CfgOptions(
                             [],
                         ),
+                        target_layout: None,
                         env: Env {
                             entries: {},
                         },
@@ -1405,6 +1423,7 @@ fn rust_project_hello_world_project_model() {
                         potential_cfg_options: CfgOptions(
                             [],
                         ),
+                        target_layout: None,
                         env: Env {
                             entries: {},
                         },
@@ -1439,6 +1458,7 @@ fn rust_project_hello_world_project_model() {
                         potential_cfg_options: CfgOptions(
                             [],
                         ),
+                        target_layout: None,
                         env: Env {
                             entries: {},
                         },
@@ -1473,6 +1493,7 @@ fn rust_project_hello_world_project_model() {
                         potential_cfg_options: CfgOptions(
                             [],
                         ),
+                        target_layout: None,
                         env: Env {
                             entries: {},
                         },
@@ -1517,6 +1538,7 @@ fn rust_project_hello_world_project_model() {
                         potential_cfg_options: CfgOptions(
                             [],
                         ),
+                        target_layout: None,
                         env: Env {
                             entries: {},
                         },
@@ -1551,6 +1573,7 @@ fn rust_project_hello_world_project_model() {
                         potential_cfg_options: CfgOptions(
                             [],
                         ),
+                        target_layout: None,
                         env: Env {
                             entries: {},
                         },
@@ -1658,6 +1681,7 @@ fn rust_project_hello_world_project_model() {
                         potential_cfg_options: CfgOptions(
                             [],
                         ),
+                        target_layout: None,
                         env: Env {
                             entries: {},
                         },
@@ -1692,6 +1716,7 @@ fn rust_project_hello_world_project_model() {
                         potential_cfg_options: CfgOptions(
                             [],
                         ),
+                        target_layout: None,
                         env: Env {
                             entries: {},
                         },
@@ -1726,6 +1751,7 @@ fn rust_project_hello_world_project_model() {
                         potential_cfg_options: CfgOptions(
                             [],
                         ),
+                        target_layout: None,
                         env: Env {
                             entries: {},
                         },
@@ -1760,6 +1786,7 @@ fn rust_project_hello_world_project_model() {
                         potential_cfg_options: CfgOptions(
                             [],
                         ),
+                        target_layout: None,
                         env: Env {
                             entries: {},
                         },
diff --git a/crates/project-model/src/workspace.rs b/crates/project-model/src/workspace.rs
index 3d199ed24a..e2382aa37e 100644
--- a/crates/project-model/src/workspace.rs
+++ b/crates/project-model/src/workspace.rs
@@ -21,8 +21,8 @@ use crate::{
     cfg_flag::CfgFlag,
     rustc_cfg,
     sysroot::SysrootCrate,
-    utf8_stdout, CargoConfig, CargoWorkspace, InvocationStrategy, ManifestPath, Package,
-    ProjectJson, ProjectManifest, Sysroot, TargetKind, WorkspaceBuildScripts,
+    target_data_layout, utf8_stdout, CargoConfig, CargoWorkspace, InvocationStrategy, ManifestPath,
+    Package, ProjectJson, ProjectManifest, Sysroot, TargetKind, WorkspaceBuildScripts,
 };
 
 /// A set of cfg-overrides per crate.
@@ -79,6 +79,7 @@ pub enum ProjectWorkspace {
         rustc_cfg: Vec<CfgFlag>,
         cfg_overrides: CfgOverrides,
         toolchain: Option<Version>,
+        target_layout: Option<String>,
     },
     /// Project workspace was manually specified using a `rust-project.json` file.
     Json { project: ProjectJson, sysroot: Option<Sysroot>, rustc_cfg: Vec<CfgFlag> },
@@ -93,7 +94,7 @@ pub enum ProjectWorkspace {
     // //
     /// Project with a set of disjoint files, not belonging to any particular workspace.
     /// Backed by basic sysroot crates for basic completion and highlighting.
-    DetachedFiles { files: Vec<AbsPathBuf>, sysroot: Sysroot, rustc_cfg: Vec<CfgFlag> },
+    DetachedFiles { files: Vec<AbsPathBuf>, sysroot: Option<Sysroot>, rustc_cfg: Vec<CfgFlag> },
 }
 
 impl fmt::Debug for ProjectWorkspace {
@@ -108,6 +109,7 @@ impl fmt::Debug for ProjectWorkspace {
                 rustc_cfg,
                 cfg_overrides,
                 toolchain,
+                target_layout: data_layout,
             } => f
                 .debug_struct("Cargo")
                 .field("root", &cargo.workspace_root().file_name())
@@ -120,6 +122,7 @@ impl fmt::Debug for ProjectWorkspace {
                 .field("n_rustc_cfg", &rustc_cfg.len())
                 .field("n_cfg_overrides", &cfg_overrides.len())
                 .field("toolchain", &toolchain)
+                .field("data_layout", &data_layout)
                 .finish(),
             ProjectWorkspace::Json { project, sysroot, rustc_cfg } => {
                 let mut debug_struct = f.debug_struct("Json");
@@ -133,7 +136,7 @@ impl fmt::Debug for ProjectWorkspace {
             ProjectWorkspace::DetachedFiles { files, sysroot, rustc_cfg } => f
                 .debug_struct("DetachedFiles")
                 .field("n_files", &files.len())
-                .field("n_sysroot_crates", &sysroot.crates().len())
+                .field("sysroot", &sysroot.is_some())
                 .field("n_rustc_cfg", &rustc_cfg.len())
                 .finish(),
         }
@@ -191,10 +194,7 @@ impl ProjectWorkspace {
                 let sysroot = match &config.sysroot {
                     Some(RustcSource::Path(path)) => {
                         Some(Sysroot::with_sysroot_dir(path.clone()).with_context(|| {
-                            format!(
-                                "Failed to find sysroot for Cargo.toml file {}.",
-                                cargo_toml.display()
-                            )
+                            format!("Failed to find sysroot at {}.", path.display())
                         })?)
                     }
                     Some(RustcSource::Discover) => Some(
@@ -244,6 +244,11 @@ impl ProjectWorkspace {
                     rustc_cfg::get(Some(&cargo_toml), config.target.as_deref(), &config.extra_env);
 
                 let cfg_overrides = config.cfg_overrides();
+                let data_layout = target_data_layout::get(
+                    Some(&cargo_toml),
+                    config.target.as_deref(),
+                    &config.extra_env,
+                );
                 ProjectWorkspace::Cargo {
                     cargo,
                     build_scripts: WorkspaceBuildScripts::default(),
@@ -252,6 +257,7 @@ impl ProjectWorkspace {
                     rustc_cfg,
                     cfg_overrides,
                     toolchain,
+                    target_layout: data_layout,
                 }
             }
         };
@@ -291,14 +297,29 @@ impl ProjectWorkspace {
         Ok(ProjectWorkspace::Json { project: project_json, sysroot, rustc_cfg })
     }
 
-    pub fn load_detached_files(detached_files: Vec<AbsPathBuf>) -> Result<ProjectWorkspace> {
-        let sysroot = Sysroot::discover(
-            detached_files
-                .first()
-                .and_then(|it| it.parent())
-                .ok_or_else(|| format_err!("No detached files to load"))?,
-            &Default::default(),
-        )?;
+    pub fn load_detached_files(
+        detached_files: Vec<AbsPathBuf>,
+        config: &CargoConfig,
+    ) -> Result<ProjectWorkspace> {
+        let sysroot = match &config.sysroot {
+            Some(RustcSource::Path(path)) => Some(
+                Sysroot::with_sysroot_dir(path.clone())
+                    .with_context(|| format!("Failed to find sysroot at {}.", path.display()))?,
+            ),
+            Some(RustcSource::Discover) => {
+                let dir = &detached_files
+                    .first()
+                    .and_then(|it| it.parent())
+                    .ok_or_else(|| format_err!("No detached files to load"))?;
+                Some(Sysroot::discover(dir, &config.extra_env).with_context(|| {
+                    format!("Failed to find sysroot in {}. Is rust-src installed?", dir.display())
+                })?)
+            }
+            None => None,
+        };
+        if let Some(sysroot) = &sysroot {
+            tracing::info!(src_root = %sysroot.src_root().display(), root = %sysroot.root().display(), "Using sysroot");
+        }
         let rustc_cfg = rustc_cfg::get(None, None, &Default::default());
         Ok(ProjectWorkspace::DetachedFiles { files: detached_files, sysroot, rustc_cfg })
     }
@@ -386,7 +407,7 @@ impl ProjectWorkspace {
                 ["libexec", "lib"]
                     .into_iter()
                     .map(|segment| sysroot.root().join(segment).join(&standalone_server_name))
-                    .find(|server_path| std::fs::metadata(&server_path).is_ok())
+                    .find(|server_path| std::fs::metadata(server_path).is_ok())
             }
             _ => None,
         }
@@ -423,6 +444,7 @@ impl ProjectWorkspace {
                 cfg_overrides: _,
                 build_scripts,
                 toolchain: _,
+                target_layout: _,
             } => {
                 cargo
                     .packages()
@@ -479,21 +501,25 @@ impl ProjectWorkspace {
                     include: vec![detached_file.clone()],
                     exclude: Vec::new(),
                 })
-                .chain(mk_sysroot(Some(sysroot)))
+                .chain(mk_sysroot(sysroot.as_ref()))
                 .collect(),
         }
     }
 
     pub fn n_packages(&self) -> usize {
         match self {
-            ProjectWorkspace::Json { project, .. } => project.n_crates(),
+            ProjectWorkspace::Json { project, sysroot, .. } => {
+                let sysroot_package_len = sysroot.as_ref().map_or(0, |it| it.crates().len());
+                sysroot_package_len + project.n_crates()
+            }
             ProjectWorkspace::Cargo { cargo, sysroot, rustc, .. } => {
                 let rustc_package_len = rustc.as_ref().map_or(0, |it| it.packages().len());
                 let sysroot_package_len = sysroot.as_ref().map_or(0, |it| it.crates().len());
                 cargo.packages().len() + sysroot_package_len + rustc_package_len
             }
             ProjectWorkspace::DetachedFiles { sysroot, files, .. } => {
-                sysroot.crates().len() + files.len()
+                let sysroot_package_len = sysroot.as_ref().map_or(0, |it| it.crates().len());
+                sysroot_package_len + files.len()
             }
         }
     }
@@ -514,6 +540,7 @@ impl ProjectWorkspace {
                 project,
                 sysroot,
                 extra_env,
+                None,
             ),
             ProjectWorkspace::Cargo {
                 cargo,
@@ -523,6 +550,7 @@ impl ProjectWorkspace {
                 cfg_overrides,
                 build_scripts,
                 toolchain: _,
+                target_layout,
             } => cargo_to_crate_graph(
                 load_proc_macro,
                 load,
@@ -532,9 +560,10 @@ impl ProjectWorkspace {
                 rustc_cfg.clone(),
                 cfg_overrides,
                 build_scripts,
+                target_layout.as_deref().map(Arc::from),
             ),
             ProjectWorkspace::DetachedFiles { files, sysroot, rustc_cfg } => {
-                detached_files_to_crate_graph(rustc_cfg.clone(), load, files, sysroot)
+                detached_files_to_crate_graph(rustc_cfg.clone(), load, files, sysroot, None)
             }
         };
         if crate_graph.patch_cfg_if() {
@@ -553,11 +582,18 @@ fn project_json_to_crate_graph(
     project: &ProjectJson,
     sysroot: &Option<Sysroot>,
     extra_env: &FxHashMap<String, String>,
+    target_layout: Option<Arc<str>>,
 ) -> CrateGraph {
     let mut crate_graph = CrateGraph::default();
-    let sysroot_deps = sysroot
-        .as_ref()
-        .map(|sysroot| sysroot_to_crate_graph(&mut crate_graph, sysroot, rustc_cfg.clone(), load));
+    let sysroot_deps = sysroot.as_ref().map(|sysroot| {
+        sysroot_to_crate_graph(
+            &mut crate_graph,
+            sysroot,
+            rustc_cfg.clone(),
+            target_layout.clone(),
+            load,
+        )
+    });
 
     let mut cfg_cache: FxHashMap<&str, Vec<CfgFlag>> = FxHashMap::default();
     let crates: NoHashHashMap<CrateId, CrateId> = project
@@ -609,6 +645,7 @@ fn project_json_to_crate_graph(
                     } else {
                         CrateOrigin::CratesIo { repo: None, name: None }
                     },
+                    target_layout.clone(),
                 ),
             )
         })
@@ -649,11 +686,18 @@ fn cargo_to_crate_graph(
     rustc_cfg: Vec<CfgFlag>,
     override_cfg: &CfgOverrides,
     build_scripts: &WorkspaceBuildScripts,
+    target_layout: Option<Arc<str>>,
 ) -> CrateGraph {
     let _p = profile::span("cargo_to_crate_graph");
     let mut crate_graph = CrateGraph::default();
     let (public_deps, libproc_macro) = match sysroot {
-        Some(sysroot) => sysroot_to_crate_graph(&mut crate_graph, sysroot, rustc_cfg.clone(), load),
+        Some(sysroot) => sysroot_to_crate_graph(
+            &mut crate_graph,
+            sysroot,
+            rustc_cfg.clone(),
+            target_layout.clone(),
+            load,
+        ),
         None => (SysrootPublicDeps::default(), None),
     };
 
@@ -716,6 +760,7 @@ fn cargo_to_crate_graph(
                     file_id,
                     &cargo[tgt].name,
                     cargo[tgt].is_proc_macro,
+                    target_layout.clone(),
                 );
                 if cargo[tgt].kind == TargetKind::Lib {
                     lib_tgt = Some((crate_id, cargo[tgt].name.clone()));
@@ -795,6 +840,7 @@ fn cargo_to_crate_graph(
                 &cfg_options,
                 override_cfg,
                 build_scripts,
+                target_layout,
             );
         }
     }
@@ -805,12 +851,21 @@ fn detached_files_to_crate_graph(
     rustc_cfg: Vec<CfgFlag>,
     load: &mut dyn FnMut(&AbsPath) -> Option<FileId>,
     detached_files: &[AbsPathBuf],
-    sysroot: &Sysroot,
+    sysroot: &Option<Sysroot>,
+    target_layout: Option<Arc<str>>,
 ) -> CrateGraph {
     let _p = profile::span("detached_files_to_crate_graph");
     let mut crate_graph = CrateGraph::default();
-    let (public_deps, _libproc_macro) =
-        sysroot_to_crate_graph(&mut crate_graph, sysroot, rustc_cfg.clone(), load);
+    let (public_deps, _libproc_macro) = match sysroot {
+        Some(sysroot) => sysroot_to_crate_graph(
+            &mut crate_graph,
+            sysroot,
+            rustc_cfg.clone(),
+            target_layout.clone(),
+            load,
+        ),
+        None => (SysrootPublicDeps::default(), None),
+    };
 
     let mut cfg_options = CfgOptions::default();
     cfg_options.extend(rustc_cfg);
@@ -841,6 +896,7 @@ fn detached_files_to_crate_graph(
                 repo: None,
                 name: display_name.map(|n| n.canonical_name().to_string()),
             },
+            target_layout.clone(),
         );
 
         public_deps.add_to_crate_graph(&mut crate_graph, detached_file_crate);
@@ -861,6 +917,7 @@ fn handle_rustc_crates(
     cfg_options: &CfgOptions,
     override_cfg: &CfgOverrides,
     build_scripts: &WorkspaceBuildScripts,
+    target_layout: Option<Arc<str>>,
 ) {
     let mut rustc_pkg_crates = FxHashMap::default();
     // The root package of the rustc-dev component is rustc_driver, so we match that
@@ -917,6 +974,7 @@ fn handle_rustc_crates(
                         file_id,
                         &rustc_workspace[tgt].name,
                         rustc_workspace[tgt].is_proc_macro,
+                        target_layout.clone(),
                     );
                     pkg_to_lib_crate.insert(pkg, crate_id);
                     // Add dependencies on core / std / alloc for this crate
@@ -981,6 +1039,7 @@ fn add_target_crate_root(
     file_id: FileId,
     cargo_name: &str,
     is_proc_macro: bool,
+    target_layout: Option<Arc<str>>,
 ) -> CrateId {
     let edition = pkg.edition;
     let mut potential_cfg_options = cfg_options.clone();
@@ -1027,6 +1086,7 @@ fn add_target_crate_root(
         proc_macro,
         is_proc_macro,
         CrateOrigin::CratesIo { repo: pkg.repository.clone(), name: Some(pkg.name.clone()) },
+        target_layout,
     )
 }
 
@@ -1048,6 +1108,7 @@ fn sysroot_to_crate_graph(
     crate_graph: &mut CrateGraph,
     sysroot: &Sysroot,
     rustc_cfg: Vec<CfgFlag>,
+    target_layout: Option<Arc<str>>,
     load: &mut dyn FnMut(&AbsPath) -> Option<FileId>,
 ) -> (SysrootPublicDeps, Option<CrateId>) {
     let _p = profile::span("sysroot_to_crate_graph");
@@ -1071,6 +1132,7 @@ fn sysroot_to_crate_graph(
                 Err("no proc macro loaded for sysroot crate".into()),
                 false,
                 CrateOrigin::Lang(LangCrateOrigin::from(&*sysroot[krate].name)),
+                target_layout.clone(),
             );
             Some((krate, crate_id))
         })
diff --git a/crates/rust-analyzer/src/bin/logger.rs b/crates/rust-analyzer/src/bin/logger.rs
index ac10721d95..8caadecd85 100644
--- a/crates/rust-analyzer/src/bin/logger.rs
+++ b/crates/rust-analyzer/src/bin/logger.rs
@@ -81,9 +81,9 @@ impl Logger {
                 Registry::default()
                     .with(
                         self.filter
-                            .add_directive(format!("chalk_solve={}", val).parse()?)
-                            .add_directive(format!("chalk_ir={}", val).parse()?)
-                            .add_directive(format!("chalk_recursive={}", val).parse()?),
+                            .add_directive(format!("chalk_solve={val}").parse()?)
+                            .add_directive(format!("chalk_ir={val}").parse()?)
+                            .add_directive(format!("chalk_recursive={val}").parse()?),
                     )
                     .with(ra_fmt_layer)
                     .with(chalk_layer)
@@ -124,7 +124,7 @@ where
             Some(log) => log.target(),
             None => event.metadata().target(),
         };
-        write!(writer, "[{} {}] ", level, target)?;
+        write!(writer, "[{level} {target}] ")?;
 
         // Write spans and fields of each span
         ctx.visit_spans(|span| {
@@ -140,7 +140,7 @@ where
             let fields = &ext.get::<FormattedFields<N>>().expect("will never be `None`");
 
             if !fields.is_empty() {
-                write!(writer, "{{{}}}", fields)?;
+                write!(writer, "{{{fields}}}")?;
             }
             write!(writer, ": ")?;
 
diff --git a/crates/rust-analyzer/src/bin/main.rs b/crates/rust-analyzer/src/bin/main.rs
index 7bf595d2a4..53710749de 100644
--- a/crates/rust-analyzer/src/bin/main.rs
+++ b/crates/rust-analyzer/src/bin/main.rs
@@ -30,7 +30,7 @@ fn main() {
         let code = match rustc_wrapper::run_rustc_skipping_cargo_checking(rustc, args.collect()) {
             Ok(rustc_wrapper::ExitCode(code)) => code.unwrap_or(102),
             Err(err) => {
-                eprintln!("{}", err);
+                eprintln!("{err}");
                 101
             }
         };
@@ -40,7 +40,7 @@ fn main() {
     let flags = flags::RustAnalyzer::from_env_or_exit();
     if let Err(err) = try_main(flags) {
         tracing::error!("Unexpected error: {}", err);
-        eprintln!("{}", err);
+        eprintln!("{err}");
         process::exit(101);
     }
 }
@@ -183,6 +183,8 @@ fn run_server() -> Result<()> {
         }
     }
 
+    config.client_specific_adjustments(&initialize_params.client_info);
+
     let server_capabilities = rust_analyzer::server_capabilities(&config);
 
     let initialize_result = lsp_types::InitializeResult {
diff --git a/crates/rust-analyzer/src/caps.rs b/crates/rust-analyzer/src/caps.rs
index 723b888d9a..122d2e6ff1 100644
--- a/crates/rust-analyzer/src/caps.rs
+++ b/crates/rust-analyzer/src/caps.rs
@@ -42,7 +42,7 @@ pub fn server_capabilities(config: &Config) -> ServerCapabilities {
                 "(".to_string(),
             ]),
             all_commit_characters: None,
-            completion_item: completion_item(&config),
+            completion_item: completion_item(config),
             work_done_progress_options: WorkDoneProgressOptions { work_done_progress: None },
         }),
         signature_help_provider: Some(SignatureHelpOptions {
@@ -67,7 +67,7 @@ pub fn server_capabilities(config: &Config) -> ServerCapabilities {
         },
         document_on_type_formatting_provider: Some(DocumentOnTypeFormattingOptions {
             first_trigger_character: "=".to_string(),
-            more_trigger_character: Some(more_trigger_character(&config)),
+            more_trigger_character: Some(more_trigger_character(config)),
         }),
         selection_range_provider: Some(SelectionRangeProviderCapability::Simple(true)),
         folding_range_provider: Some(FoldingRangeProviderCapability::Simple(true)),
diff --git a/crates/rust-analyzer/src/cli.rs b/crates/rust-analyzer/src/cli.rs
index 60ba67e25f..d5d877680a 100644
--- a/crates/rust-analyzer/src/cli.rs
+++ b/crates/rust-analyzer/src/cli.rs
@@ -46,7 +46,7 @@ fn report_metric(metric: &str, value: u64, unit: &str) {
     if std::env::var("RA_METRICS").is_err() {
         return;
     }
-    println!("METRIC:{}:{}:{}", metric, value, unit)
+    println!("METRIC:{metric}:{value}:{unit}")
 }
 
 fn print_memory_usage(mut host: AnalysisHost, vfs: Vfs) {
@@ -65,6 +65,6 @@ fn print_memory_usage(mut host: AnalysisHost, vfs: Vfs) {
 
     for (name, bytes) in mem {
         // NOTE: Not a debug print, so avoid going through the `eprintln` defined above.
-        eprintln!("{:>8} {}", bytes, name);
+        eprintln!("{bytes:>8} {name}");
     }
 }
diff --git a/crates/rust-analyzer/src/cli/analysis_stats.rs b/crates/rust-analyzer/src/cli/analysis_stats.rs
index 01fccc83e8..053db5fc53 100644
--- a/crates/rust-analyzer/src/cli/analysis_stats.rs
+++ b/crates/rust-analyzer/src/cli/analysis_stats.rs
@@ -87,9 +87,9 @@ impl flags::AnalysisStats {
             load_workspace(workspace, &cargo_config.extra_env, &load_cargo_config)?;
         let db = host.raw_database();
         eprint!("{:<20} {}", "Database loaded:", db_load_sw.elapsed());
-        eprint!(" (metadata {}", metadata_time);
+        eprint!(" (metadata {metadata_time}");
         if let Some(build_scripts_time) = build_scripts_time {
-            eprint!("; build {}", build_scripts_time);
+            eprint!("; build {build_scripts_time}");
         }
         eprintln!(")");
 
@@ -118,7 +118,7 @@ impl flags::AnalysisStats {
             shuffle(&mut rng, &mut visit_queue);
         }
 
-        eprint!("  crates: {}", num_crates);
+        eprint!("  crates: {num_crates}");
         let mut num_decls = 0;
         let mut funcs = Vec::new();
         while let Some(module) = visit_queue.pop() {
@@ -142,7 +142,7 @@ impl flags::AnalysisStats {
                 }
             }
         }
-        eprintln!(", mods: {}, decls: {}, fns: {}", visited_modules.len(), num_decls, funcs.len());
+        eprintln!(", mods: {}, decls: {num_decls}, fns: {}", visited_modules.len(), funcs.len());
         eprintln!("{:<20} {}", "Item Collection:", analysis_sw.elapsed());
 
         if self.randomize {
@@ -154,7 +154,7 @@ impl flags::AnalysisStats {
         }
 
         let total_span = analysis_sw.elapsed();
-        eprintln!("{:<20} {}", "Total:", total_span);
+        eprintln!("{:<20} {total_span}", "Total:");
         report_metric("total time", total_span.time.as_millis() as u64, "ms");
         if let Some(instructions) = total_span.instructions {
             report_metric("total instructions", instructions, "#instr");
@@ -179,7 +179,7 @@ impl flags::AnalysisStats {
                     total_macro_file_size += syntax_len(val.syntax_node())
                 }
             }
-            eprintln!("source files: {}, macro files: {}", total_file_size, total_macro_file_size);
+            eprintln!("source files: {total_file_size}, macro files: {total_macro_file_size}");
         }
 
         if self.memory_usage && verbosity.is_verbose() {
@@ -239,7 +239,7 @@ impl flags::AnalysisStats {
                     continue;
                 }
             }
-            let mut msg = format!("processing: {}", full_name);
+            let mut msg = format!("processing: {full_name}");
             if verbosity.is_verbose() {
                 if let Some(src) = f.source(db) {
                     let original_file = src.file_id.original_file(db);
@@ -275,7 +275,7 @@ impl flags::AnalysisStats {
                                 end.col,
                             ));
                         } else {
-                            bar.println(format!("{}: Unknown type", name,));
+                            bar.println(format!("{name}: Unknown type",));
                         }
                     }
                     true
@@ -402,7 +402,7 @@ fn location_csv(
     let text_range = original_range.range;
     let (start, end) =
         (line_index.line_col(text_range.start()), line_index.line_col(text_range.end()));
-    format!("{},{}:{},{}:{}", path, start.line + 1, start.col, end.line + 1, end.col)
+    format!("{path},{}:{},{}:{}", start.line + 1, start.col, end.line + 1, end.col)
 }
 
 fn expr_syntax_range(
diff --git a/crates/rust-analyzer/src/cli/diagnostics.rs b/crates/rust-analyzer/src/cli/diagnostics.rs
index 247007db0a..fd5b3ce61f 100644
--- a/crates/rust-analyzer/src/cli/diagnostics.rs
+++ b/crates/rust-analyzer/src/cli/diagnostics.rs
@@ -40,7 +40,7 @@ impl flags::Diagnostics {
             if !visited_files.contains(&file_id) {
                 let crate_name =
                     module.krate().display_name(db).as_deref().unwrap_or("unknown").to_string();
-                println!("processing crate: {}, module: {}", crate_name, _vfs.file_path(file_id));
+                println!("processing crate: {crate_name}, module: {}", _vfs.file_path(file_id));
                 for diagnostic in analysis
                     .diagnostics(
                         &DiagnosticsConfig::test_sample(),
@@ -53,7 +53,7 @@ impl flags::Diagnostics {
                         found_error = true;
                     }
 
-                    println!("{:?}", diagnostic);
+                    println!("{diagnostic:?}");
                 }
 
                 visited_files.insert(file_id);
diff --git a/crates/rust-analyzer/src/cli/flags.rs b/crates/rust-analyzer/src/cli/flags.rs
index 5bcc97e226..770612cc94 100644
--- a/crates/rust-analyzer/src/cli/flags.rs
+++ b/crates/rust-analyzer/src/cli/flags.rs
@@ -255,7 +255,7 @@ impl FromStr for OutputFormat {
     fn from_str(s: &str) -> Result<Self, Self::Err> {
         match s {
             "csv" => Ok(Self::Csv),
-            _ => Err(format!("unknown output format `{}`", s)),
+            _ => Err(format!("unknown output format `{s}`")),
         }
     }
 }
diff --git a/crates/rust-analyzer/src/cli/highlight.rs b/crates/rust-analyzer/src/cli/highlight.rs
index 4f9b362f1b..84607b9fd5 100644
--- a/crates/rust-analyzer/src/cli/highlight.rs
+++ b/crates/rust-analyzer/src/cli/highlight.rs
@@ -8,7 +8,7 @@ impl flags::Highlight {
     pub fn run(self) -> anyhow::Result<()> {
         let (analysis, file_id) = Analysis::from_single_file(read_stdin()?);
         let html = analysis.highlight_as_html(file_id, self.rainbow).unwrap();
-        println!("{}", html);
+        println!("{html}");
         Ok(())
     }
 }
diff --git a/crates/rust-analyzer/src/cli/lsif.rs b/crates/rust-analyzer/src/cli/lsif.rs
index c74ddabb17..af8356d041 100644
--- a/crates/rust-analyzer/src/cli/lsif.rs
+++ b/crates/rust-analyzer/src/cli/lsif.rs
@@ -83,7 +83,7 @@ impl LsifManager<'_> {
 
     // FIXME: support file in addition to stdout here
     fn emit(&self, data: &str) {
-        println!("{}", data);
+        println!("{data}");
     }
 
     fn get_token_id(&mut self, id: TokenId) -> Id {
@@ -253,7 +253,7 @@ impl LsifManager<'_> {
         };
         let result = folds
             .into_iter()
-            .map(|it| to_proto::folding_range(&*text, &line_index, false, it))
+            .map(|it| to_proto::folding_range(&text, &line_index, false, it))
             .collect();
         let folding_id = self.add_vertex(lsif::Vertex::FoldingRangeResult { result });
         self.add_edge(lsif::Edge::FoldingRange(lsif::EdgeData {
diff --git a/crates/rust-analyzer/src/cli/progress_report.rs b/crates/rust-analyzer/src/cli/progress_report.rs
index 5a2dc39d52..d459dd115c 100644
--- a/crates/rust-analyzer/src/cli/progress_report.rs
+++ b/crates/rust-analyzer/src/cli/progress_report.rs
@@ -67,7 +67,7 @@ impl ProgressReport {
             return;
         }
         let percent = (self.curr * 100.0) as u32;
-        let text = format!("{}/{} {:3>}% {}", self.pos, self.len, percent, self.msg);
+        let text = format!("{}/{} {percent:3>}% {}", self.pos, self.len, self.msg);
         self.update_text(&text);
     }
 
@@ -114,7 +114,7 @@ impl ProgressReport {
         // Fill all last text to space and return the cursor
         let spaces = " ".repeat(self.text.len());
         let backspaces = "\x08".repeat(self.text.len());
-        print!("{}{}{}", backspaces, spaces, backspaces);
+        print!("{backspaces}{spaces}{backspaces}");
         let _ = io::stdout().flush();
 
         self.text = String::new();
diff --git a/crates/rust-analyzer/src/cli/scip.rs b/crates/rust-analyzer/src/cli/scip.rs
index 9edd045ab0..b050d1e95a 100644
--- a/crates/rust-analyzer/src/cli/scip.rs
+++ b/crates/rust-analyzer/src/cli/scip.rs
@@ -28,7 +28,7 @@ impl flags::Scip {
         let now = Instant::now();
         let cargo_config = CargoConfig::default();
 
-        let no_progress = &|s| (eprintln!("rust-analyzer: Loading {}", s));
+        let no_progress = &|s| (eprintln!("rust-analyzer: Loading {s}"));
         let load_cargo_config = LoadCargoConfig {
             load_out_dirs_from_check: true,
             with_proc_macro: true,
@@ -102,7 +102,7 @@ impl flags::Scip {
                 let symbol = tokens_to_symbol
                     .entry(id)
                     .or_insert_with(|| {
-                        let symbol = token_to_symbol(&token).unwrap_or_else(&mut new_local_symbol);
+                        let symbol = token_to_symbol(token).unwrap_or_else(&mut new_local_symbol);
                         scip::symbol::format_symbol(symbol)
                     })
                     .clone();
@@ -176,7 +176,7 @@ fn get_relative_filepath(
     rootpath: &vfs::AbsPathBuf,
     file_id: ide::FileId,
 ) -> Option<String> {
-    Some(vfs.file_path(file_id).as_path()?.strip_prefix(&rootpath)?.as_ref().to_str()?.to_string())
+    Some(vfs.file_path(file_id).as_path()?.strip_prefix(rootpath)?.as_ref().to_str()?.to_string())
 }
 
 // SCIP Ranges have a (very large) optimization that ranges if they are on the same line
@@ -209,7 +209,7 @@ fn new_descriptor_str(
 fn new_descriptor(name: Name, suffix: scip_types::descriptor::Suffix) -> scip_types::Descriptor {
     let mut name = name.to_string();
     if name.contains("'") {
-        name = format!("`{}`", name);
+        name = format!("`{name}`");
     }
 
     new_descriptor_str(name.as_str(), suffix)
@@ -303,11 +303,11 @@ mod test {
         }
 
         if expected == "" {
-            assert!(found_symbol.is_none(), "must have no symbols {:?}", found_symbol);
+            assert!(found_symbol.is_none(), "must have no symbols {found_symbol:?}");
             return;
         }
 
-        assert!(found_symbol.is_some(), "must have one symbol {:?}", found_symbol);
+        assert!(found_symbol.is_some(), "must have one symbol {found_symbol:?}");
         let res = found_symbol.unwrap();
         let formatted = format_symbol(res);
         assert_eq!(formatted, expected);
diff --git a/crates/rust-analyzer/src/cli/ssr.rs b/crates/rust-analyzer/src/cli/ssr.rs
index e8291782b7..84c4891716 100644
--- a/crates/rust-analyzer/src/cli/ssr.rs
+++ b/crates/rust-analyzer/src/cli/ssr.rs
@@ -70,7 +70,7 @@ impl flags::Search {
                 let sr = db.source_root(root);
                 for file_id in sr.iter() {
                     for debug_info in match_finder.debug_where_text_equal(file_id, debug_snippet) {
-                        println!("{:#?}", debug_info);
+                        println!("{debug_info:#?}");
                     }
                 }
             }
diff --git a/crates/rust-analyzer/src/cli/symbols.rs b/crates/rust-analyzer/src/cli/symbols.rs
index 84659b5ea9..9fad6723af 100644
--- a/crates/rust-analyzer/src/cli/symbols.rs
+++ b/crates/rust-analyzer/src/cli/symbols.rs
@@ -9,7 +9,7 @@ impl flags::Symbols {
         let (analysis, file_id) = Analysis::from_single_file(text);
         let structure = analysis.file_structure(file_id).unwrap();
         for s in structure {
-            println!("{:?}", s);
+            println!("{s:?}");
         }
         Ok(())
     }
diff --git a/crates/rust-analyzer/src/config.rs b/crates/rust-analyzer/src/config.rs
index 6b2f22faa7..b0afbdc9a4 100644
--- a/crates/rust-analyzer/src/config.rs
+++ b/crates/rust-analyzer/src/config.rs
@@ -20,7 +20,7 @@ use ide_db::{
     SnippetCap,
 };
 use itertools::Itertools;
-use lsp_types::{ClientCapabilities, MarkupKind};
+use lsp_types::{ClientCapabilities, ClientInfo, MarkupKind};
 use project_model::{
     CargoConfig, CargoFeatures, ProjectJson, ProjectJsonData, ProjectManifest, RustcSource,
     UnsetTestCrates,
@@ -124,22 +124,23 @@ config_data! {
         /// Unsets `#[cfg(test)]` for the specified crates.
         cargo_unsetTest: Vec<String>     = "[\"core\"]",
 
+        /// Run the check command for diagnostics on save.
+        checkOnSave | checkOnSave_enable: bool                         = "true",
+
         /// Check all targets and tests (`--all-targets`).
-        checkOnSave_allTargets: bool                     = "true",
+        check_allTargets | checkOnSave_allTargets: bool                  = "true",
         /// Cargo command to use for `cargo check`.
-        checkOnSave_command: String                      = "\"check\"",
-        /// Run specified `cargo check` command for diagnostics on save.
-        checkOnSave_enable: bool                         = "true",
+        check_command | checkOnSave_command: String                      = "\"check\"",
         /// Extra arguments for `cargo check`.
-        checkOnSave_extraArgs: Vec<String>               = "[]",
+        check_extraArgs | checkOnSave_extraArgs: Vec<String>             = "[]",
         /// Extra environment variables that will be set when running `cargo check`.
         /// Extends `#rust-analyzer.cargo.extraEnv#`.
-        checkOnSave_extraEnv: FxHashMap<String, String> = "{}",
+        check_extraEnv | checkOnSave_extraEnv: FxHashMap<String, String> = "{}",
         /// List of features to activate. Defaults to
         /// `#rust-analyzer.cargo.features#`.
         ///
         /// Set to `"all"` to pass `--all-features` to Cargo.
-        checkOnSave_features: Option<CargoFeaturesDef>      = "null",
+        check_features | checkOnSave_features: Option<CargoFeaturesDef>  = "null",
         /// Specifies the working directory for running checks.
         /// - "workspace": run checks for workspaces in the corresponding workspaces' root directories.
         // FIXME: Ideally we would support this in some way
@@ -147,19 +148,21 @@ config_data! {
         /// - "root": run checks in the project's root directory.
         /// This config only has an effect when `#rust-analyzer.cargo.buildScripts.overrideCommand#`
         /// is set.
-        checkOnSave_invocationLocation: InvocationLocation = "\"workspace\"",
+        check_invocationLocation | checkOnSave_invocationLocation: InvocationLocation = "\"workspace\"",
         /// Specifies the invocation strategy to use when running the checkOnSave command.
         /// If `per_workspace` is set, the command will be executed for each workspace.
         /// If `once` is set, the command will be executed once.
         /// This config only has an effect when `#rust-analyzer.cargo.buildScripts.overrideCommand#`
         /// is set.
-        checkOnSave_invocationStrategy: InvocationStrategy = "\"per_workspace\"",
+        check_invocationStrategy | checkOnSave_invocationStrategy: InvocationStrategy = "\"per_workspace\"",
         /// Whether to pass `--no-default-features` to Cargo. Defaults to
         /// `#rust-analyzer.cargo.noDefaultFeatures#`.
-        checkOnSave_noDefaultFeatures: Option<bool>      = "null",
+        check_noDefaultFeatures | checkOnSave_noDefaultFeatures: Option<bool>         = "null",
         /// Override the command rust-analyzer uses instead of `cargo check` for
         /// diagnostics on save. The command is required to output json and
-        /// should therefore include `--message-format=json` or a similar option.
+        /// should therefore include `--message-format=json` or a similar option
+        /// (if your client supports the `colorDiagnosticOutput` experimental
+        /// capability, you can use `--message-format=json-diagnostic-rendered-ansi`).
         ///
         /// If you're changing this because you're using some tool wrapping
         /// Cargo, you might also want to change
@@ -175,14 +178,14 @@ config_data! {
         /// cargo check --workspace --message-format=json --all-targets
         /// ```
         /// .
-        checkOnSave_overrideCommand: Option<Vec<String>> = "null",
+        check_overrideCommand | checkOnSave_overrideCommand: Option<Vec<String>>             = "null",
         /// Check for specific targets. Defaults to `#rust-analyzer.cargo.target#` if empty.
         ///
         /// Can be a single target, e.g. `"x86_64-unknown-linux-gnu"` or a list of targets, e.g.
         /// `["aarch64-apple-darwin", "x86_64-apple-darwin"]`.
         ///
         /// Aliased as `"checkOnSave.targets"`.
-        checkOnSave_target | checkOnSave_targets: CheckOnSaveTargets           = "[]",
+        check_targets | checkOnSave_targets | checkOnSave_target: Option<CheckOnSaveTargets> = "null",
 
         /// Toggles the additional completions that automatically add imports when completed.
         /// Note that your client must specify the `additionalTextEdits` LSP client capability to truly have this feature enabled.
@@ -327,12 +330,20 @@ config_data! {
         inlayHints_closingBraceHints_minLines: usize               = "25",
         /// Whether to show inlay type hints for return types of closures.
         inlayHints_closureReturnTypeHints_enable: ClosureReturnTypeHintsDef  = "\"never\"",
+        /// Whether to show enum variant discriminant hints.
+        inlayHints_discriminantHints_enable: DiscriminantHintsDef            = "\"never\"",
         /// Whether to show inlay hints for type adjustments.
         inlayHints_expressionAdjustmentHints_enable: AdjustmentHintsDef = "\"never\"",
+        /// Whether to hide inlay hints for type adjustments outside of `unsafe` blocks.
+        inlayHints_expressionAdjustmentHints_hideOutsideUnsafe: bool = "false",
+        /// Whether to show inlay hints as postfix ops (`.*` instead of `*`, etc).
+        inlayHints_expressionAdjustmentHints_mode: AdjustmentHintsModeDef = "\"prefix\"",
         /// Whether to show inlay type hints for elided lifetimes in function signatures.
         inlayHints_lifetimeElisionHints_enable: LifetimeElisionDef = "\"never\"",
         /// Whether to prefer using parameter names as the name for elided lifetime hints if possible.
         inlayHints_lifetimeElisionHints_useParameterNames: bool    = "false",
+        /// Whether to use location links for parts of type mentioned in inlay hints.
+        inlayHints_locationLinks: bool                             = "true",
         /// Maximum length for inlay hints. Set to null to have an unlimited length.
         inlayHints_maxLength: Option<usize>                        = "25",
         /// Whether to show function parameter name inlay hints at the call
@@ -403,6 +414,9 @@ config_data! {
         /// Whether to show `can't find Cargo.toml` error message.
         notifications_cargoTomlNotFound: bool      = "true",
 
+        /// How many worker threads in the main loop. The default `null` means to pick automatically.
+        numThreads: Option<usize> = "null",
+
         /// Expand attribute macros. Requires `#rust-analyzer.procMacro.enable#` to be set.
         procMacro_attributes_enable: bool = "true",
         /// Enable support for procedural macros, implies `#rust-analyzer.cargo.buildScripts.enable#`.
@@ -714,6 +728,19 @@ impl Config {
         }
     }
 
+    pub fn client_specific_adjustments(&mut self, client_info: &Option<ClientInfo>) {
+        // FIXME: remove this when we drop support for vscode 1.65 and below
+        if let Some(client) = client_info {
+            if client.name.contains("Code") || client.name.contains("Codium") {
+                if let Some(version) = &client.version {
+                    if version.as_str() < "1.76" {
+                        self.data.inlayHints_locationLinks = false;
+                    }
+                }
+            }
+        }
+    }
+
     pub fn update(&mut self, mut json: serde_json::Value) -> Result<(), ConfigUpdateError> {
         tracing::info!("updating config from JSON: {:#}", json);
         if json.is_null() || json.as_object().map_or(false, |it| it.is_empty()) {
@@ -767,9 +794,9 @@ impl Config {
 
     fn validate(&self, error_sink: &mut Vec<(String, serde_json::Error)>) {
         use serde::de::Error;
-        if self.data.checkOnSave_command.is_empty() {
+        if self.data.check_command.is_empty() {
             error_sink.push((
-                "/checkOnSave/command".to_string(),
+                "/check/command".to_string(),
                 serde_json::Error::custom("expected a non-empty string"),
             ));
         }
@@ -981,6 +1008,11 @@ impl Config {
         self.experimental("serverStatusNotification")
     }
 
+    /// Whether the client supports colored output for full diagnostics from `checkOnSave`.
+    pub fn color_diagnostic_output(&self) -> bool {
+        self.experimental("colorDiagnosticOutput")
+    }
+
     pub fn publish_diagnostics(&self) -> bool {
         self.data.diagnostics_enable
     }
@@ -1014,7 +1046,7 @@ impl Config {
 
     pub fn check_on_save_extra_env(&self) -> FxHashMap<String, String> {
         let mut extra_env = self.data.cargo_extraEnv.clone();
-        extra_env.extend(self.data.checkOnSave_extraEnv.clone());
+        extra_env.extend(self.data.check_extraEnv.clone());
         extra_env
     }
 
@@ -1125,11 +1157,8 @@ impl Config {
         }
     }
 
-    pub fn flycheck(&self) -> Option<FlycheckConfig> {
-        if !self.data.checkOnSave_enable {
-            return None;
-        }
-        let flycheck_config = match &self.data.checkOnSave_overrideCommand {
+    pub fn flycheck(&self) -> FlycheckConfig {
+        match &self.data.check_overrideCommand {
             Some(args) if !args.is_empty() => {
                 let mut args = args.clone();
                 let command = args.remove(0);
@@ -1137,13 +1166,13 @@ impl Config {
                     command,
                     args,
                     extra_env: self.check_on_save_extra_env(),
-                    invocation_strategy: match self.data.checkOnSave_invocationStrategy {
+                    invocation_strategy: match self.data.check_invocationStrategy {
                         InvocationStrategy::Once => flycheck::InvocationStrategy::Once,
                         InvocationStrategy::PerWorkspace => {
                             flycheck::InvocationStrategy::PerWorkspace
                         }
                     },
-                    invocation_location: match self.data.checkOnSave_invocationLocation {
+                    invocation_location: match self.data.check_invocationLocation {
                         InvocationLocation::Root => {
                             flycheck::InvocationLocation::Root(self.root_path.clone())
                         }
@@ -1152,34 +1181,43 @@ impl Config {
                 }
             }
             Some(_) | None => FlycheckConfig::CargoCommand {
-                command: self.data.checkOnSave_command.clone(),
-                target_triples: match &self.data.checkOnSave_target.0[..] {
-                    [] => self.data.cargo_target.clone().into_iter().collect(),
-                    targets => targets.into(),
-                },
-                all_targets: self.data.checkOnSave_allTargets,
+                command: self.data.check_command.clone(),
+                target_triples: self
+                    .data
+                    .check_targets
+                    .clone()
+                    .and_then(|targets| match &targets.0[..] {
+                        [] => None,
+                        targets => Some(targets.into()),
+                    })
+                    .unwrap_or_else(|| self.data.cargo_target.clone().into_iter().collect()),
+                all_targets: self.data.check_allTargets,
                 no_default_features: self
                     .data
-                    .checkOnSave_noDefaultFeatures
+                    .check_noDefaultFeatures
                     .unwrap_or(self.data.cargo_noDefaultFeatures),
                 all_features: matches!(
-                    self.data.checkOnSave_features.as_ref().unwrap_or(&self.data.cargo_features),
+                    self.data.check_features.as_ref().unwrap_or(&self.data.cargo_features),
                     CargoFeaturesDef::All
                 ),
                 features: match self
                     .data
-                    .checkOnSave_features
+                    .check_features
                     .clone()
                     .unwrap_or_else(|| self.data.cargo_features.clone())
                 {
                     CargoFeaturesDef::All => vec![],
                     CargoFeaturesDef::Selected(it) => it,
                 },
-                extra_args: self.data.checkOnSave_extraArgs.clone(),
+                extra_args: self.data.check_extraArgs.clone(),
                 extra_env: self.check_on_save_extra_env(),
+                ansi_color_output: self.color_diagnostic_output(),
             },
-        };
-        Some(flycheck_config)
+        }
+    }
+
+    pub fn check_on_save(&self) -> bool {
+        self.data.checkOnSave
     }
 
     pub fn runnables(&self) -> RunnablesConfig {
@@ -1191,10 +1229,16 @@ impl Config {
 
     pub fn inlay_hints(&self) -> InlayHintsConfig {
         InlayHintsConfig {
+            location_links: self.data.inlayHints_locationLinks,
             render_colons: self.data.inlayHints_renderColons,
             type_hints: self.data.inlayHints_typeHints_enable,
             parameter_hints: self.data.inlayHints_parameterHints_enable,
             chaining_hints: self.data.inlayHints_chainingHints_enable,
+            discriminant_hints: match self.data.inlayHints_discriminantHints_enable {
+                DiscriminantHintsDef::Always => ide::DiscriminantHints::Always,
+                DiscriminantHintsDef::Never => ide::DiscriminantHints::Never,
+                DiscriminantHintsDef::Fieldless => ide::DiscriminantHints::Fieldless,
+            },
             closure_return_type_hints: match self.data.inlayHints_closureReturnTypeHints_enable {
                 ClosureReturnTypeHintsDef::Always => ide::ClosureReturnTypeHints::Always,
                 ClosureReturnTypeHintsDef::Never => ide::ClosureReturnTypeHints::Never,
@@ -1219,6 +1263,15 @@ impl Config {
                 },
                 AdjustmentHintsDef::Reborrow => ide::AdjustmentHints::ReborrowOnly,
             },
+            adjustment_hints_mode: match self.data.inlayHints_expressionAdjustmentHints_mode {
+                AdjustmentHintsModeDef::Prefix => ide::AdjustmentHintsMode::Prefix,
+                AdjustmentHintsModeDef::Postfix => ide::AdjustmentHintsMode::Postfix,
+                AdjustmentHintsModeDef::PreferPrefix => ide::AdjustmentHintsMode::PreferPrefix,
+                AdjustmentHintsModeDef::PreferPostfix => ide::AdjustmentHintsMode::PreferPostfix,
+            },
+            adjustment_hints_hide_outside_unsafe: self
+                .data
+                .inlayHints_expressionAdjustmentHints_hideOutsideUnsafe,
             binding_mode_hints: self.data.inlayHints_bindingModeHints_enable,
             param_names_for_lifetime_elision_hints: self
                 .data
@@ -1449,6 +1502,10 @@ impl Config {
         }
     }
 
+    pub fn main_loop_num_threads(&self) -> usize {
+        self.data.numThreads.unwrap_or(num_cpus::get_physical().try_into().unwrap_or(1))
+    }
+
     pub fn typing_autoclose_angle(&self) -> bool {
         self.data.typing_autoClosingAngleBrackets_enable
     }
@@ -1553,6 +1610,7 @@ mod de_unit_v {
     named_unit_variant!(skip_trivial);
     named_unit_variant!(mutable);
     named_unit_variant!(reborrow);
+    named_unit_variant!(fieldless);
     named_unit_variant!(with_block);
 }
 
@@ -1716,6 +1774,26 @@ enum AdjustmentHintsDef {
     Reborrow,
 }
 
+#[derive(Deserialize, Debug, Clone)]
+#[serde(untagged)]
+enum DiscriminantHintsDef {
+    #[serde(deserialize_with = "true_or_always")]
+    Always,
+    #[serde(deserialize_with = "false_or_never")]
+    Never,
+    #[serde(deserialize_with = "de_unit_v::fieldless")]
+    Fieldless,
+}
+
+#[derive(Deserialize, Debug, Clone)]
+#[serde(rename_all = "snake_case")]
+enum AdjustmentHintsModeDef {
+    Prefix,
+    Postfix,
+    PreferPrefix,
+    PreferPostfix,
+}
+
 #[derive(Deserialize, Debug, Clone)]
 #[serde(rename_all = "snake_case")]
 enum FilesWatcherDef {
@@ -1817,40 +1895,35 @@ fn get_field<T: DeserializeOwned>(
     alias: Option<&'static str>,
     default: &str,
 ) -> T {
-    let default = serde_json::from_str(default).unwrap();
     // XXX: check alias first, to work-around the VS Code where it pre-fills the
     // defaults instead of sending an empty object.
     alias
         .into_iter()
         .chain(iter::once(field))
-        .find_map(move |field| {
+        .filter_map(move |field| {
             let mut pointer = field.replace('_', "/");
             pointer.insert(0, '/');
-            json.pointer_mut(&pointer).and_then(|it| match serde_json::from_value(it.take()) {
-                Ok(it) => Some(it),
-                Err(e) => {
-                    tracing::warn!("Failed to deserialize config field at {}: {:?}", pointer, e);
-                    error_sink.push((pointer, e));
-                    None
-                }
-            })
+            json.pointer_mut(&pointer)
+                .map(|it| serde_json::from_value(it.take()).map_err(|e| (e, pointer)))
         })
-        .unwrap_or(default)
+        .find(Result::is_ok)
+        .and_then(|res| match res {
+            Ok(it) => Some(it),
+            Err((e, pointer)) => {
+                tracing::warn!("Failed to deserialize config field at {}: {:?}", pointer, e);
+                error_sink.push((pointer, e));
+                None
+            }
+        })
+        .unwrap_or_else(|| serde_json::from_str(default).unwrap())
 }
 
 fn schema(fields: &[(&'static str, &'static str, &[&str], &str)]) -> serde_json::Value {
-    for ((f1, ..), (f2, ..)) in fields.iter().zip(&fields[1..]) {
-        fn key(f: &str) -> &str {
-            f.splitn(2, '_').next().unwrap()
-        }
-        assert!(key(f1) <= key(f2), "wrong field order: {:?} {:?}", f1, f2);
-    }
-
     let map = fields
         .iter()
         .map(|(field, ty, doc, default)| {
             let name = field.replace('_', ".");
-            let name = format!("rust-analyzer.{}", name);
+            let name = format!("rust-analyzer.{name}");
             let props = field_props(field, ty, doc, default);
             (name, props)
         })
@@ -1863,9 +1936,7 @@ fn field_props(field: &str, ty: &str, doc: &[&str], default: &str) -> serde_json
     let doc = doc.trim_end_matches('\n');
     assert!(
         doc.ends_with('.') && doc.starts_with(char::is_uppercase),
-        "bad docs for {}: {:?}",
-        field,
-        doc
+        "bad docs for {field}: {doc:?}"
     );
     let default = default.parse::<serde_json::Value>().unwrap();
 
@@ -1921,15 +1992,6 @@ fn field_props(field: &str, ty: &str, doc: &[&str], default: &str) -> serde_json
             "type": ["null", "array"],
             "items": { "type": "string" },
         },
-        "MergeBehaviorDef" => set! {
-            "type": "string",
-            "enum": ["none", "crate", "module"],
-            "enumDescriptions": [
-                "Do not merge imports at all.",
-                "Merge imports from the same crate into a single `use` statement.",
-                "Merge imports from the same module into a single `use` statement."
-            ],
-        },
         "ExprFillDefaultDef" => set! {
             "type": "string",
             "enum": ["todo", "default"],
@@ -2038,6 +2100,34 @@ fn field_props(field: &str, ty: &str, doc: &[&str], default: &str) -> serde_json
                 "Only show auto borrow and dereference adjustment hints."
             ]
         },
+        "DiscriminantHintsDef" => set! {
+            "type": "string",
+            "enum": [
+                "always",
+                "never",
+                "fieldless"
+            ],
+            "enumDescriptions": [
+                "Always show all discriminant hints.",
+                "Never show discriminant hints.",
+                "Only show discriminant hints on fieldless enum variants."
+            ]
+        },
+        "AdjustmentHintsModeDef" => set! {
+            "type": "string",
+            "enum": [
+                "prefix",
+                "postfix",
+                "prefer_prefix",
+                "prefer_postfix",
+            ],
+            "enumDescriptions": [
+                "Always show adjustment hints as prefix (`*expr`).",
+                "Always show adjustment hints as postfix (`expr.*`).",
+                "Show prefix or postfix depending on which uses less parenthesis, prefering prefix.",
+                "Show prefix or postfix depending on which uses less parenthesis, prefering postfix.",
+            ]
+        },
         "CargoFeaturesDef" => set! {
             "anyOf": [
                 {
@@ -2126,8 +2216,11 @@ fn field_props(field: &str, ty: &str, doc: &[&str], default: &str) -> serde_json
                 "The command will be executed in the project root."
             ],
         },
-        "CheckOnSaveTargets" => set! {
+        "Option<CheckOnSaveTargets>" => set! {
             "anyOf": [
+                {
+                    "type": "null"
+                },
                 {
                     "type": "string",
                 },
@@ -2137,7 +2230,7 @@ fn field_props(field: &str, ty: &str, doc: &[&str], default: &str) -> serde_json
                 },
             ],
         },
-        _ => panic!("missing entry for {}: {}", ty, default),
+        _ => panic!("missing entry for {ty}: {default}"),
     }
 
     map.into()
@@ -2149,30 +2242,29 @@ fn manual(fields: &[(&'static str, &'static str, &[&str], &str)]) -> String {
         .iter()
         .map(|(field, _ty, doc, default)| {
             let name = format!("rust-analyzer.{}", field.replace('_', "."));
-            let doc = doc_comment_to_string(*doc);
+            let doc = doc_comment_to_string(doc);
             if default.contains('\n') {
                 format!(
-                    r#"[[{}]]{}::
+                    r#"[[{name}]]{name}::
 +
 --
 Default:
 ----
-{}
+{default}
 ----
-{}
+{doc}
 --
-"#,
-                    name, name, default, doc
+"#
                 )
             } else {
-                format!("[[{}]]{} (default: `{}`)::\n+\n--\n{}--\n", name, name, default, doc)
+                format!("[[{name}]]{name} (default: `{default}`)::\n+\n--\n{doc}--\n")
             }
         })
         .collect::<String>()
 }
 
 fn doc_comment_to_string(doc: &[&str]) -> String {
-    doc.iter().map(|it| it.strip_prefix(' ').unwrap_or(it)).map(|it| format!("{}\n", it)).collect()
+    doc.iter().map(|it| it.strip_prefix(' ').unwrap_or(it)).map(|it| format!("{it}\n")).collect()
 }
 
 #[cfg(test)]
@@ -2186,7 +2278,7 @@ mod tests {
     #[test]
     fn generate_package_json_config() {
         let s = Config::json_schema();
-        let schema = format!("{:#}", s);
+        let schema = format!("{s:#}");
         let mut schema = schema
             .trim_start_matches('{')
             .trim_end_matches('}')
diff --git a/crates/rust-analyzer/src/config/patch_old_style.rs b/crates/rust-analyzer/src/config/patch_old_style.rs
index 472e2e0eee..de6ac946a6 100644
--- a/crates/rust-analyzer/src/config/patch_old_style.rs
+++ b/crates/rust-analyzer/src/config/patch_old_style.rs
@@ -4,6 +4,9 @@ use serde_json::{json, Value};
 /// This function patches the json config to the new expected keys.
 /// That is we try to load old known config keys here and convert them to the new ones.
 /// See https://github.com/rust-lang/rust-analyzer/pull/12010
+///
+/// We already have an alias system for simple cases, but if we make structural changes
+/// the alias infra fails down.
 pub(super) fn patch_json_for_outdated_configs(json: &mut Value) {
     let copy = json.clone();
 
@@ -105,9 +108,9 @@ pub(super) fn patch_json_for_outdated_configs(json: &mut Value) {
         merge(json, json!({ "cargo": { "features": "all" } }));
     }
 
-    // checkOnSave_allFeatures, checkOnSave_features -> checkOnSave_features
+    // checkOnSave_allFeatures, checkOnSave_features -> check_features
     if let Some(Value::Bool(true)) = copy.pointer("/checkOnSave/allFeatures") {
-        merge(json, json!({ "checkOnSave": { "features": "all" } }));
+        merge(json, json!({ "check": { "features": "all" } }));
     }
 
     // completion_addCallArgumentSnippets completion_addCallParenthesis -> completion_callable_snippets
@@ -116,11 +119,21 @@ pub(super) fn patch_json_for_outdated_configs(json: &mut Value) {
         copy.pointer("/completion/addCallParenthesis"),
     ) {
         (Some(Value::Bool(true)), Some(Value::Bool(true))) => json!("fill_arguments"),
-        (Some(Value::Bool(true)), _) => json!("add_parentheses"),
+        (_, Some(Value::Bool(true))) => json!("add_parentheses"),
         (Some(Value::Bool(false)), Some(Value::Bool(false))) => json!("none"),
         (_, _) => return,
     };
     merge(json, json!({ "completion": { "callable": {"snippets": res }} }));
+
+    // We need to do this due to the checkOnSave_enable -> checkOnSave change, as that key now can either be an object or a bool
+    // checkOnSave_* -> check_*
+    if let Some(Value::Object(obj)) = copy.pointer("/checkOnSave") {
+        // checkOnSave_enable -> checkOnSave
+        if let Some(b @ Value::Bool(_)) = obj.get("enable") {
+            merge(json, json!({ "checkOnSave": b }));
+        }
+        merge(json, json!({ "check": obj }));
+    }
 }
 
 fn merge(dst: &mut Value, src: Value) {
diff --git a/crates/rust-analyzer/src/diagnostics.rs b/crates/rust-analyzer/src/diagnostics.rs
index f516c194da..83b03fe473 100644
--- a/crates/rust-analyzer/src/diagnostics.rs
+++ b/crates/rust-analyzer/src/diagnostics.rs
@@ -101,8 +101,7 @@ impl DiagnosticCollection {
         file_id: FileId,
     ) -> impl Iterator<Item = &lsp_types::Diagnostic> {
         let native = self.native.get(&file_id).into_iter().flatten();
-        let check =
-            self.check.values().filter_map(move |it| it.get(&file_id)).into_iter().flatten();
+        let check = self.check.values().filter_map(move |it| it.get(&file_id)).flatten();
         native.chain(check)
     }
 
diff --git a/crates/rust-analyzer/src/diagnostics/to_proto.rs b/crates/rust-analyzer/src/diagnostics/to_proto.rs
index beb23c54c9..acb416a068 100644
--- a/crates/rust-analyzer/src/diagnostics/to_proto.rs
+++ b/crates/rust-analyzer/src/diagnostics/to_proto.rs
@@ -161,7 +161,7 @@ fn resolve_path(
         .iter()
         .find_map(|(from, to)| file_name.strip_prefix(from).map(|file_name| (to, file_name)))
     {
-        Some((to, file_name)) => workspace_root.join(format!("{}{}", to, file_name)),
+        Some((to, file_name)) => workspace_root.join(format!("{to}{file_name}")),
         None => workspace_root.join(file_name),
     }
 }
@@ -191,6 +191,7 @@ fn map_rust_child_diagnostic(
 
     let mut edit_map: HashMap<lsp_types::Url, Vec<lsp_types::TextEdit>> = HashMap::new();
     let mut suggested_replacements = Vec::new();
+    let mut is_preferred = true;
     for &span in &spans {
         if let Some(suggested_replacement) = &span.suggested_replacement {
             if !suggested_replacement.is_empty() {
@@ -209,6 +210,8 @@ fn map_rust_child_diagnostic(
             ) {
                 edit_map.entry(location.uri).or_default().push(edit);
             }
+            is_preferred &=
+                matches!(span.suggestion_applicability, Some(Applicability::MachineApplicable));
         }
     }
 
@@ -218,7 +221,7 @@ fn map_rust_child_diagnostic(
     if !suggested_replacements.is_empty() {
         message.push_str(": ");
         let suggestions =
-            suggested_replacements.iter().map(|suggestion| format!("`{}`", suggestion)).join(", ");
+            suggested_replacements.iter().map(|suggestion| format!("`{suggestion}`")).join(", ");
         message.push_str(&suggestions);
     }
 
@@ -251,7 +254,7 @@ fn map_rust_child_diagnostic(
                         document_changes: None,
                         change_annotations: None,
                     }),
-                    is_preferred: Some(true),
+                    is_preferred: Some(is_preferred),
                     data: None,
                     command: None,
                 },
@@ -493,7 +496,7 @@ fn rustc_code_description(code: Option<&str>) -> Option<lsp_types::CodeDescripti
             && chars.next().is_none()
     })
     .and_then(|code| {
-        lsp_types::Url::parse(&format!("https://doc.rust-lang.org/error-index.html#{}", code))
+        lsp_types::Url::parse(&format!("https://doc.rust-lang.org/error-index.html#{code}"))
             .ok()
             .map(|href| lsp_types::CodeDescription { href })
     })
@@ -502,8 +505,7 @@ fn rustc_code_description(code: Option<&str>) -> Option<lsp_types::CodeDescripti
 fn clippy_code_description(code: Option<&str>) -> Option<lsp_types::CodeDescription> {
     code.and_then(|code| {
         lsp_types::Url::parse(&format!(
-            "https://rust-lang.github.io/rust-clippy/master/index.html#{}",
-            code
+            "https://rust-lang.github.io/rust-clippy/master/index.html#{code}"
         ))
         .ok()
         .map(|href| lsp_types::CodeDescription { href })
diff --git a/crates/rust-analyzer/src/dispatch.rs b/crates/rust-analyzer/src/dispatch.rs
index 57899b5991..715804449a 100644
--- a/crates/rust-analyzer/src/dispatch.rs
+++ b/crates/rust-analyzer/src/dispatch.rs
@@ -145,7 +145,7 @@ impl<'a> RequestDispatcher<'a> {
         match res {
             Ok(params) => {
                 let panic_context =
-                    format!("\nversion: {}\nrequest: {} {:#?}", version(), R::METHOD, params);
+                    format!("\nversion: {}\nrequest: {} {params:#?}", version(), R::METHOD);
                 Some((req, params, panic_context))
             }
             Err(err) => {
diff --git a/crates/rust-analyzer/src/from_proto.rs b/crates/rust-analyzer/src/from_proto.rs
index dd433b0f4d..2dbb14fcd9 100644
--- a/crates/rust-analyzer/src/from_proto.rs
+++ b/crates/rust-analyzer/src/from_proto.rs
@@ -25,12 +25,9 @@ pub(crate) fn vfs_path(url: &lsp_types::Url) -> Result<vfs::VfsPath> {
 
 pub(crate) fn offset(line_index: &LineIndex, position: lsp_types::Position) -> Result<TextSize> {
     let line_col = match line_index.encoding {
-        PositionEncoding::Utf8 => {
-            LineCol { line: position.line as u32, col: position.character as u32 }
-        }
+        PositionEncoding::Utf8 => LineCol { line: position.line, col: position.character },
         PositionEncoding::Utf16 => {
-            let line_col =
-                LineColUtf16 { line: position.line as u32, col: position.character as u32 };
+            let line_col = LineColUtf16 { line: position.line, col: position.character };
             line_index.index.to_utf8(line_col)
         }
     };
@@ -67,7 +64,15 @@ pub(crate) fn file_range(
     text_document_identifier: lsp_types::TextDocumentIdentifier,
     range: lsp_types::Range,
 ) -> Result<FileRange> {
-    let file_id = file_id(snap, &text_document_identifier.uri)?;
+    file_range_uri(snap, &text_document_identifier.uri, range)
+}
+
+pub(crate) fn file_range_uri(
+    snap: &GlobalStateSnapshot,
+    document: &lsp_types::Url,
+    range: lsp_types::Range,
+) -> Result<FileRange> {
+    let file_id = file_id(snap, document)?;
     let line_index = snap.file_line_index(file_id)?;
     let range = text_range(&line_index, range)?;
     Ok(FileRange { file_id, range })
diff --git a/crates/rust-analyzer/src/global_state.rs b/crates/rust-analyzer/src/global_state.rs
index 4e8bc8d646..c6f4e9ce07 100644
--- a/crates/rust-analyzer/src/global_state.rs
+++ b/crates/rust-analyzer/src/global_state.rs
@@ -134,7 +134,7 @@ impl GlobalState {
 
         let task_pool = {
             let (sender, receiver) = unbounded();
-            let handle = TaskPool::new(sender);
+            let handle = TaskPool::new_with_threads(sender, config.main_loop_num_threads());
             Handle { handle, receiver }
         };
 
@@ -429,6 +429,6 @@ pub(crate) fn file_id_to_url(vfs: &vfs::Vfs, id: FileId) -> Url {
 
 pub(crate) fn url_to_file_id(vfs: &vfs::Vfs, url: &Url) -> Result<FileId> {
     let path = from_proto::vfs_path(url)?;
-    let res = vfs.file_id(&path).ok_or_else(|| format!("file not found: {}", path))?;
+    let res = vfs.file_id(&path).ok_or_else(|| format!("file not found: {path}"))?;
     Ok(res)
 }
diff --git a/crates/rust-analyzer/src/handlers.rs b/crates/rust-analyzer/src/handlers.rs
index d190a9f4e2..59bdd30612 100644
--- a/crates/rust-analyzer/src/handlers.rs
+++ b/crates/rust-analyzer/src/handlers.rs
@@ -28,7 +28,8 @@ use lsp_types::{
 use project_model::{ManifestPath, ProjectWorkspace, TargetKind};
 use serde_json::json;
 use stdx::{format_to, never};
-use syntax::{algo, ast, AstNode, TextRange, TextSize, T};
+use syntax::{algo, ast, AstNode, TextRange, TextSize};
+use tracing::error;
 use vfs::AbsPathBuf;
 
 use crate::{
@@ -729,7 +730,7 @@ pub(crate) fn handle_runnables(
         Some(spec) => {
             for cmd in ["check", "test"] {
                 res.push(lsp_ext::Runnable {
-                    label: format!("cargo {} -p {} --all-targets", cmd, spec.package),
+                    label: format!("cargo {cmd} -p {} --all-targets", spec.package),
                     location: None,
                     kind: lsp_ext::RunnableKind::Cargo,
                     args: lsp_ext::CargoRunnable {
@@ -812,18 +813,6 @@ pub(crate) fn handle_completion(
     let completion_trigger_character =
         params.context.and_then(|ctx| ctx.trigger_character).and_then(|s| s.chars().next());
 
-    if Some(':') == completion_trigger_character {
-        let source_file = snap.analysis.parse(position.file_id)?;
-        let left_token = source_file.syntax().token_at_offset(position.offset).left_biased();
-        let completion_triggered_after_single_colon = match left_token {
-            Some(left_token) => left_token.kind() == T![:],
-            None => true,
-        };
-        if completion_triggered_after_single_colon {
-            return Ok(None);
-        }
-    }
-
     let completion_config = &snap.config.completion();
     let items = match snap.analysis.completions(
         completion_config,
@@ -910,7 +899,7 @@ pub(crate) fn handle_folding_range(
     let line_folding_only = snap.config.line_folding_only();
     let res = folds
         .into_iter()
-        .map(|it| to_proto::folding_range(&*text, &line_index, line_folding_only, it))
+        .map(|it| to_proto::folding_range(&text, &line_index, line_folding_only, it))
         .collect();
     Ok(Some(res))
 }
@@ -990,7 +979,7 @@ pub(crate) fn handle_rename(
     let position = from_proto::file_position(&snap, params.text_document_position)?;
 
     let mut change =
-        snap.analysis.rename(position, &*params.new_name)?.map_err(to_proto::rename_error)?;
+        snap.analysis.rename(position, &params.new_name)?.map_err(to_proto::rename_error)?;
 
     // this is kind of a hack to prevent double edits from happening when moving files
     // When a module gets renamed by renaming the mod declaration this causes the file to move
@@ -1112,9 +1101,7 @@ pub(crate) fn handle_code_action(
     }
 
     // Fixes from `cargo check`.
-    for fix in
-        snap.check_fixes.values().filter_map(|it| it.get(&frange.file_id)).into_iter().flatten()
-    {
+    for fix in snap.check_fixes.values().filter_map(|it| it.get(&frange.file_id)).flatten() {
         // FIXME: this mapping is awkward and shouldn't exist. Refactor
         // `snap.check_fixes` to not convert to LSP prematurely.
         let intersect_fix_range = fix
@@ -1157,8 +1144,8 @@ pub(crate) fn handle_code_action_resolve(
         Ok(parsed_data) => parsed_data,
         Err(e) => {
             return Err(invalid_params_error(format!(
-                "Failed to parse action id string '{}': {}",
-                params.id, e
+                "Failed to parse action id string '{}': {e}",
+                params.id
             ))
             .into())
         }
@@ -1202,7 +1189,7 @@ fn parse_action_id(action_id: &str) -> Result<(usize, SingleResolve), String> {
             let assist_kind: AssistKind = assist_kind_string.parse()?;
             let index: usize = match index_string.parse() {
                 Ok(index) => index,
-                Err(e) => return Err(format!("Incorrect index string: {}", e)),
+                Err(e) => return Err(format!("Incorrect index string: {e}")),
             };
             Ok((index, SingleResolve { assist_id: assist_id_string.to_string(), assist_kind }))
         }
@@ -1384,9 +1371,26 @@ pub(crate) fn handle_inlay_hints_resolve(
 
     let resolve_data: lsp_ext::InlayHintResolveData = serde_json::from_value(data)?;
 
-    let file_range = from_proto::file_range(
+    match snap.url_file_version(&resolve_data.text_document.uri) {
+        Some(version) if version == resolve_data.text_document.version => {}
+        Some(version) => {
+            error!(
+                "attempted inlayHints/resolve of '{}' at version {} while server version is {}",
+                resolve_data.text_document.uri, resolve_data.text_document.version, version,
+            );
+            return Ok(hint);
+        }
+        None => {
+            error!(
+                "attempted inlayHints/resolve of unknown file '{}' at version {}",
+                resolve_data.text_document.uri, resolve_data.text_document.version,
+            );
+            return Ok(hint);
+        }
+    }
+    let file_range = from_proto::file_range_uri(
         &snap,
-        resolve_data.text_document,
+        &resolve_data.text_document.uri,
         match resolve_data.position {
             PositionOrRange::Position(pos) => Range::new(pos, pos),
             PositionOrRange::Range(range) => range,
@@ -1782,14 +1786,15 @@ fn run_rustfmt(
     let file_id = from_proto::file_id(snap, &text_document.uri)?;
     let file = snap.analysis.file_text(file_id)?;
 
-    // find the edition of the package the file belongs to
-    // (if it belongs to multiple we'll just pick the first one and pray)
-    let edition = snap
+    // Determine the edition of the crate the file belongs to (if there's multiple, we pick the
+    // highest edition).
+    let editions = snap
         .analysis
         .relevant_crates_for(file_id)?
         .into_iter()
-        .find_map(|crate_id| snap.cargo_target_for_crate_root(crate_id))
-        .map(|(ws, target)| ws[ws[target].package].edition);
+        .map(|crate_id| snap.analysis.crate_edition(crate_id))
+        .collect::<Result<Vec<_>, _>>()?;
+    let edition = editions.iter().copied().max();
 
     let line_index = snap.file_line_index(file_id)?;
 
@@ -1863,7 +1868,7 @@ fn run_rustfmt(
         .stdout(Stdio::piped())
         .stderr(Stdio::piped())
         .spawn()
-        .context(format!("Failed to spawn {:?}", command))?;
+        .context(format!("Failed to spawn {command:?}"))?;
 
     rustfmt.stdin.as_mut().unwrap().write_all(file.as_bytes())?;
 
@@ -1896,9 +1901,9 @@ fn run_rustfmt(
                     format!(
                         r#"rustfmt exited with:
                            Status: {}
-                           stdout: {}
-                           stderr: {}"#,
-                        output.status, captured_stdout, captured_stderr,
+                           stdout: {captured_stdout}
+                           stderr: {captured_stderr}"#,
+                        output.status,
                     ),
                 )
                 .into())
diff --git a/crates/rust-analyzer/src/integrated_benchmarks.rs b/crates/rust-analyzer/src/integrated_benchmarks.rs
index 96b1cb6b12..405d261db6 100644
--- a/crates/rust-analyzer/src/integrated_benchmarks.rs
+++ b/crates/rust-analyzer/src/integrated_benchmarks.rs
@@ -48,7 +48,7 @@ fn integrated_highlighting_benchmark() {
     let file_id = {
         let file = workspace_to_load.join(file);
         let path = VfsPath::from(AbsPathBuf::assert(file));
-        vfs.file_id(&path).unwrap_or_else(|| panic!("can't find virtual file for {}", path))
+        vfs.file_id(&path).unwrap_or_else(|| panic!("can't find virtual file for {path}"))
     };
 
     {
@@ -102,7 +102,7 @@ fn integrated_completion_benchmark() {
     let file_id = {
         let file = workspace_to_load.join(file);
         let path = VfsPath::from(AbsPathBuf::assert(file));
-        vfs.file_id(&path).unwrap_or_else(|| panic!("can't find virtual file for {}", path))
+        vfs.file_id(&path).unwrap_or_else(|| panic!("can't find virtual file for {path}"))
     };
 
     {
diff --git a/crates/rust-analyzer/src/lib.rs b/crates/rust-analyzer/src/lib.rs
index 552379752f..32dc3750fd 100644
--- a/crates/rust-analyzer/src/lib.rs
+++ b/crates/rust-analyzer/src/lib.rs
@@ -55,7 +55,7 @@ pub type Result<T, E = Error> = std::result::Result<T, E>;
 
 pub fn from_json<T: DeserializeOwned>(what: &'static str, json: &serde_json::Value) -> Result<T> {
     let res = serde_json::from_value(json.clone())
-        .map_err(|e| format!("Failed to deserialize {}: {}; {}", what, e, json))?;
+        .map_err(|e| format!("Failed to deserialize {what}: {e}; {json}"))?;
     Ok(res)
 }
 
diff --git a/crates/rust-analyzer/src/lsp_ext.rs b/crates/rust-analyzer/src/lsp_ext.rs
index 8cc5648f3c..65620b4209 100644
--- a/crates/rust-analyzer/src/lsp_ext.rs
+++ b/crates/rust-analyzer/src/lsp_ext.rs
@@ -3,11 +3,11 @@
 use std::{collections::HashMap, path::PathBuf};
 
 use lsp_types::request::Request;
-use lsp_types::PositionEncodingKind;
 use lsp_types::{
     notification::Notification, CodeActionKind, DocumentOnTypeFormattingParams,
     PartialResultParams, Position, Range, TextDocumentIdentifier, WorkDoneProgressParams,
 };
+use lsp_types::{PositionEncodingKind, VersionedTextDocumentIdentifier};
 use serde::{Deserialize, Serialize};
 
 pub enum AnalyzerStatus {}
@@ -132,12 +132,31 @@ pub struct ExpandedMacro {
 
 pub enum CancelFlycheck {}
 
-impl Request for CancelFlycheck {
+impl Notification for CancelFlycheck {
     type Params = ();
-    type Result = ();
     const METHOD: &'static str = "rust-analyzer/cancelFlycheck";
 }
 
+pub enum RunFlycheck {}
+
+impl Notification for RunFlycheck {
+    type Params = RunFlycheckParams;
+    const METHOD: &'static str = "rust-analyzer/runFlycheck";
+}
+
+pub enum ClearFlycheck {}
+
+impl Notification for ClearFlycheck {
+    type Params = ();
+    const METHOD: &'static str = "rust-analyzer/clearFlycheck";
+}
+
+#[derive(Deserialize, Serialize, Debug)]
+#[serde(rename_all = "camelCase")]
+pub struct RunFlycheckParams {
+    pub text_document: Option<TextDocumentIdentifier>,
+}
+
 pub enum MatchingBrace {}
 
 impl Request for MatchingBrace {
@@ -550,7 +569,7 @@ pub struct CompletionResolveData {
 
 #[derive(Debug, Serialize, Deserialize)]
 pub struct InlayHintResolveData {
-    pub text_document: TextDocumentIdentifier,
+    pub text_document: VersionedTextDocumentIdentifier,
     pub position: PositionOrRange,
 }
 
diff --git a/crates/rust-analyzer/src/lsp_utils.rs b/crates/rust-analyzer/src/lsp_utils.rs
index 0971dc36f3..dcaee92857 100644
--- a/crates/rust-analyzer/src/lsp_utils.rs
+++ b/crates/rust-analyzer/src/lsp_utils.rs
@@ -98,7 +98,7 @@ impl GlobalState {
         });
         let cancellable = Some(cancel_token.is_some());
         let token = lsp_types::ProgressToken::String(
-            cancel_token.unwrap_or_else(|| format!("rustAnalyzer/{}", title)),
+            cancel_token.unwrap_or_else(|| format!("rustAnalyzer/{title}")),
         );
         let work_done_progress = match state {
             Progress::Begin => {
diff --git a/crates/rust-analyzer/src/main_loop.rs b/crates/rust-analyzer/src/main_loop.rs
index 274588ce0e..0bc940dfe8 100644
--- a/crates/rust-analyzer/src/main_loop.rs
+++ b/crates/rust-analyzer/src/main_loop.rs
@@ -229,8 +229,8 @@ impl GlobalState {
 
                             message = match &report.crates_currently_indexing[..] {
                                 [crate_name] => Some(format!(
-                                    "{}/{} ({})",
-                                    report.crates_done, report.crates_total, crate_name
+                                    "{}/{} ({crate_name})",
+                                    report.crates_done, report.crates_total
                                 )),
                                 [crate_name, rest @ ..] => Some(format!(
                                     "{}/{} ({} + {} more)",
@@ -414,10 +414,7 @@ impl GlobalState {
         let loop_duration = loop_start.elapsed();
         if loop_duration > Duration::from_millis(100) && was_quiescent {
             tracing::warn!("overly long loop turn: {:?}", loop_duration);
-            self.poke_rust_analyzer_developer(format!(
-                "overly long loop turn: {:?}",
-                loop_duration
-            ));
+            self.poke_rust_analyzer_developer(format!("overly long loop turn: {loop_duration:?}"));
         }
         Ok(())
     }
@@ -516,7 +513,7 @@ impl GlobalState {
                 self.report_progress(
                     "Roots Scanned",
                     state,
-                    Some(format!("{}/{}", n_done, n_total)),
+                    Some(format!("{n_done}/{n_total}")),
                     Some(Progress::fraction(n_done, n_total)),
                     None,
                 )
@@ -561,10 +558,7 @@ impl GlobalState {
                     flycheck::Progress::DidCheckCrate(target) => (Progress::Report, Some(target)),
                     flycheck::Progress::DidCancel => (Progress::End, None),
                     flycheck::Progress::DidFailToRestart(err) => {
-                        self.show_and_log_error(
-                            "cargo check failed".to_string(),
-                            Some(err.to_string()),
-                        );
+                        self.show_and_log_error("cargo check failed".to_string(), Some(err));
                         return;
                     }
                     flycheck::Progress::DidFinish(result) => {
@@ -581,10 +575,7 @@ impl GlobalState {
                 // When we're running multiple flychecks, we have to include a disambiguator in
                 // the title, or the editor complains. Note that this is a user-facing string.
                 let title = if self.flycheck.len() == 1 {
-                    match self.config.flycheck() {
-                        Some(config) => format!("{}", config),
-                        None => "cargo check".to_string(),
-                    }
+                    format!("{}", self.config.flycheck())
                 } else {
                     format!("cargo check (#{})", id + 1)
                 };
@@ -593,7 +584,7 @@ impl GlobalState {
                     state,
                     message,
                     None,
-                    Some(format!("rust-analyzer/checkOnSave/{}", id)),
+                    Some(format!("rust-analyzer/flycheck/{id}")),
                 );
             }
         }
@@ -638,7 +629,6 @@ impl GlobalState {
             .on_sync_mut::<lsp_ext::ReloadWorkspace>(handlers::handle_workspace_reload)
             .on_sync_mut::<lsp_ext::MemoryUsage>(handlers::handle_memory_usage)
             .on_sync_mut::<lsp_ext::ShuffleCrateGraph>(handlers::handle_shuffle_crate_graph)
-            .on_sync_mut::<lsp_ext::CancelFlycheck>(handlers::handle_cancel_flycheck)
             .on_sync::<lsp_ext::JoinLines>(handlers::handle_join_lines)
             .on_sync::<lsp_ext::OnEnter>(handlers::handle_on_enter)
             .on_sync::<lsp_types::request::SelectionRangeRequest>(handlers::handle_selection_range)
@@ -703,6 +693,88 @@ impl GlobalState {
 
     /// Handles an incoming notification.
     fn on_notification(&mut self, not: Notification) -> Result<()> {
+        // FIXME: Move these implementations out into a module similar to on_request
+        fn run_flycheck(this: &mut GlobalState, vfs_path: VfsPath) -> bool {
+            let file_id = this.vfs.read().0.file_id(&vfs_path);
+            if let Some(file_id) = file_id {
+                let world = this.snapshot();
+                let mut updated = false;
+                let task = move || -> std::result::Result<(), ide::Cancelled> {
+                    // Trigger flychecks for all workspaces that depend on the saved file
+                    // Crates containing or depending on the saved file
+                    let crate_ids: Vec<_> = world
+                        .analysis
+                        .crates_for(file_id)?
+                        .into_iter()
+                        .flat_map(|id| world.analysis.transitive_rev_deps(id))
+                        .flatten()
+                        .sorted()
+                        .unique()
+                        .collect();
+
+                    let crate_root_paths: Vec<_> = crate_ids
+                        .iter()
+                        .filter_map(|&crate_id| {
+                            world
+                                .analysis
+                                .crate_root(crate_id)
+                                .map(|file_id| {
+                                    world
+                                        .file_id_to_file_path(file_id)
+                                        .as_path()
+                                        .map(ToOwned::to_owned)
+                                })
+                                .transpose()
+                        })
+                        .collect::<ide::Cancellable<_>>()?;
+                    let crate_root_paths: Vec<_> =
+                        crate_root_paths.iter().map(Deref::deref).collect();
+
+                    // Find all workspaces that have at least one target containing the saved file
+                    let workspace_ids =
+                        world.workspaces.iter().enumerate().filter(|(_, ws)| match ws {
+                            project_model::ProjectWorkspace::Cargo { cargo, .. } => {
+                                cargo.packages().any(|pkg| {
+                                    cargo[pkg].targets.iter().any(|&it| {
+                                        crate_root_paths.contains(&cargo[it].root.as_path())
+                                    })
+                                })
+                            }
+                            project_model::ProjectWorkspace::Json { project, .. } => project
+                                .crates()
+                                .any(|(c, _)| crate_ids.iter().any(|&crate_id| crate_id == c)),
+                            project_model::ProjectWorkspace::DetachedFiles { .. } => false,
+                        });
+
+                    // Find and trigger corresponding flychecks
+                    for flycheck in world.flycheck.iter() {
+                        for (id, _) in workspace_ids.clone() {
+                            if id == flycheck.id() {
+                                updated = true;
+                                flycheck.restart();
+                                continue;
+                            }
+                        }
+                    }
+                    // No specific flycheck was triggered, so let's trigger all of them.
+                    if !updated {
+                        for flycheck in world.flycheck.iter() {
+                            flycheck.restart();
+                        }
+                    }
+                    Ok(())
+                };
+                this.task_pool.handle.spawn_with_sender(move |_| {
+                    if let Err(e) = std::panic::catch_unwind(task) {
+                        tracing::error!("flycheck task panicked: {e:?}")
+                    }
+                });
+                true
+            } else {
+                false
+            }
+        }
+
         NotificationDispatcher { not: Some(not), global_state: self }
             .on::<lsp_types::notification::Cancel>(|this, params| {
                 let id: lsp_server::RequestId = match params.id {
@@ -714,7 +786,7 @@ impl GlobalState {
             })?
             .on::<lsp_types::notification::WorkDoneProgressCancel>(|this, params| {
                 if let lsp_types::NumberOrString::String(s) = &params.token {
-                    if let Some(id) = s.strip_prefix("rust-analyzer/checkOnSave/") {
+                    if let Some(id) = s.strip_prefix("rust-analyzer/flycheck/") {
                         if let Ok(id) = u32::from_str_radix(id, 10) {
                             if let Some(flycheck) = this.flycheck.get(id as usize) {
                                 flycheck.cancel();
@@ -743,6 +815,7 @@ impl GlobalState {
                 }
                 Ok(())
             })?
+            .on::<lsp_ext::CancelFlycheck>(handlers::handle_cancel_flycheck)?
             .on::<lsp_types::notification::DidChangeTextDocument>(|this, params| {
                 if let Ok(path) = from_proto::vfs_path(&params.text_document.uri) {
                     match this.mem_docs.get_mut(&path) {
@@ -782,99 +855,42 @@ impl GlobalState {
                 }
                 Ok(())
             })?
+            .on::<lsp_ext::ClearFlycheck>(|this, ()| {
+                this.diagnostics.clear_check_all();
+                Ok(())
+            })?
+            .on::<lsp_ext::RunFlycheck>(|this, params| {
+                if let Some(text_document) = params.text_document {
+                    if let Ok(vfs_path) = from_proto::vfs_path(&text_document.uri) {
+                        if run_flycheck(this, vfs_path) {
+                            return Ok(());
+                        }
+                    }
+                }
+                // No specific flycheck was triggered, so let's trigger all of them.
+                for flycheck in this.flycheck.iter() {
+                    flycheck.restart();
+                }
+                Ok(())
+            })?
             .on::<lsp_types::notification::DidSaveTextDocument>(|this, params| {
                 if let Ok(vfs_path) = from_proto::vfs_path(&params.text_document.uri) {
                     // Re-fetch workspaces if a workspace related file has changed
                     if let Some(abs_path) = vfs_path.as_path() {
-                        if reload::should_refresh_for_change(&abs_path, ChangeKind::Modify) {
+                        if reload::should_refresh_for_change(abs_path, ChangeKind::Modify) {
                             this.fetch_workspaces_queue
                                 .request_op(format!("DidSaveTextDocument {}", abs_path.display()));
                         }
                     }
 
-                    let file_id = this.vfs.read().0.file_id(&vfs_path);
-                    if let Some(file_id) = file_id {
-                        let world = this.snapshot();
-                        let mut updated = false;
-                        let task = move || -> std::result::Result<(), ide::Cancelled> {
-                            // Trigger flychecks for all workspaces that depend on the saved file
-                            // Crates containing or depending on the saved file
-                            let crate_ids: Vec<_> = world
-                                .analysis
-                                .crates_for(file_id)?
-                                .into_iter()
-                                .flat_map(|id| world.analysis.transitive_rev_deps(id))
-                                .flatten()
-                                .sorted()
-                                .unique()
-                                .collect();
-
-                            let crate_root_paths: Vec<_> = crate_ids
-                                .iter()
-                                .filter_map(|&crate_id| {
-                                    world
-                                        .analysis
-                                        .crate_root(crate_id)
-                                        .map(|file_id| {
-                                            world
-                                                .file_id_to_file_path(file_id)
-                                                .as_path()
-                                                .map(ToOwned::to_owned)
-                                        })
-                                        .transpose()
-                                })
-                                .collect::<ide::Cancellable<_>>()?;
-                            let crate_root_paths: Vec<_> =
-                                crate_root_paths.iter().map(Deref::deref).collect();
-
-                            // Find all workspaces that have at least one target containing the saved file
-                            let workspace_ids =
-                                world.workspaces.iter().enumerate().filter(|(_, ws)| match ws {
-                                    project_model::ProjectWorkspace::Cargo { cargo, .. } => {
-                                        cargo.packages().any(|pkg| {
-                                            cargo[pkg].targets.iter().any(|&it| {
-                                                crate_root_paths.contains(&cargo[it].root.as_path())
-                                            })
-                                        })
-                                    }
-                                    project_model::ProjectWorkspace::Json { project, .. } => {
-                                        project.crates().any(|(c, _)| {
-                                            crate_ids.iter().any(|&crate_id| crate_id == c)
-                                        })
-                                    }
-                                    project_model::ProjectWorkspace::DetachedFiles { .. } => false,
-                                });
-
-                            // Find and trigger corresponding flychecks
-                            for flycheck in world.flycheck.iter() {
-                                for (id, _) in workspace_ids.clone() {
-                                    if id == flycheck.id() {
-                                        updated = true;
-                                        flycheck.restart();
-                                        continue;
-                                    }
-                                }
-                            }
-                            // No specific flycheck was triggered, so let's trigger all of them.
-                            if !updated {
-                                for flycheck in world.flycheck.iter() {
-                                    flycheck.restart();
-                                }
-                            }
-                            Ok(())
-                        };
-                        this.task_pool.handle.spawn_with_sender(move |_| {
-                            if let Err(e) = std::panic::catch_unwind(task) {
-                                tracing::error!("DidSaveTextDocument flycheck task panicked: {e:?}")
-                            }
-                        });
+                    if !this.config.check_on_save() || run_flycheck(this, vfs_path) {
                         return Ok(());
                     }
-                }
-
-                // No specific flycheck was triggered, so let's trigger all of them.
-                for flycheck in this.flycheck.iter() {
-                    flycheck.restart();
+                } else if this.config.check_on_save() {
+                    // No specific flycheck was triggered, so let's trigger all of them.
+                    for flycheck in this.flycheck.iter() {
+                        flycheck.restart();
+                    }
                 }
                 Ok(())
             })?
diff --git a/crates/rust-analyzer/src/reload.rs b/crates/rust-analyzer/src/reload.rs
index fcfe4be0b8..9bbce70ec0 100644
--- a/crates/rust-analyzer/src/reload.rs
+++ b/crates/rust-analyzer/src/reload.rs
@@ -158,8 +158,10 @@ impl GlobalState {
                     .collect::<Vec<_>>();
 
                 if !detached_files.is_empty() {
-                    workspaces
-                        .push(project_model::ProjectWorkspace::load_detached_files(detached_files));
+                    workspaces.push(project_model::ProjectWorkspace::load_detached_files(
+                        detached_files,
+                        &cargo_config,
+                    ));
                 }
 
                 tracing::info!("did fetch workspaces {:?}", workspaces);
@@ -224,6 +226,7 @@ impl GlobalState {
 
                     build_scripts: _,
                     toolchain: _,
+                    target_layout: _,
                 } => Some((cargo, sysroot, rustc, rustc_cfg, cfg_overrides)),
                 _ => None,
             };
@@ -447,15 +450,7 @@ impl GlobalState {
 
     fn reload_flycheck(&mut self) {
         let _p = profile::span("GlobalState::reload_flycheck");
-        let config = match self.config.flycheck() {
-            Some(it) => it,
-            None => {
-                self.flycheck = Arc::new([]);
-                self.diagnostics.clear_check_all();
-                return;
-            }
-        };
-
+        let config = self.config.flycheck();
         let sender = self.flycheck_sender.clone();
         let invocation_strategy = match config {
             FlycheckConfig::CargoCommand { .. } => flycheck::InvocationStrategy::PerWorkspace,
@@ -466,7 +461,7 @@ impl GlobalState {
             flycheck::InvocationStrategy::Once => vec![FlycheckHandle::spawn(
                 0,
                 Box::new(move |msg| sender.send(msg).unwrap()),
-                config.clone(),
+                config,
                 self.config.root_path().clone(),
             )],
             flycheck::InvocationStrategy::PerWorkspace => {
diff --git a/crates/rust-analyzer/src/semantic_tokens.rs b/crates/rust-analyzer/src/semantic_tokens.rs
index c48410ed55..c2cc3f422d 100644
--- a/crates/rust-analyzer/src/semantic_tokens.rs
+++ b/crates/rust-analyzer/src/semantic_tokens.rs
@@ -161,8 +161,8 @@ impl SemanticTokensBuilder {
 
     /// Push a new token onto the builder
     pub(crate) fn push(&mut self, range: Range, token_index: u32, modifier_bitset: u32) {
-        let mut push_line = range.start.line as u32;
-        let mut push_char = range.start.character as u32;
+        let mut push_line = range.start.line;
+        let mut push_char = range.start.character;
 
         if !self.data.is_empty() {
             push_line -= self.prev_line;
@@ -177,15 +177,15 @@ impl SemanticTokensBuilder {
         let token = SemanticToken {
             delta_line: push_line,
             delta_start: push_char,
-            length: token_len as u32,
+            length: token_len,
             token_type: token_index,
             token_modifiers_bitset: modifier_bitset,
         };
 
         self.data.push(token);
 
-        self.prev_line = range.start.line as u32;
-        self.prev_char = range.start.character as u32;
+        self.prev_line = range.start.line;
+        self.prev_char = range.start.character;
     }
 
     pub(crate) fn build(self) -> SemanticTokens {
diff --git a/crates/rust-analyzer/src/task_pool.rs b/crates/rust-analyzer/src/task_pool.rs
index aeeb3b7c58..616e449984 100644
--- a/crates/rust-analyzer/src/task_pool.rs
+++ b/crates/rust-analyzer/src/task_pool.rs
@@ -8,12 +8,13 @@ pub(crate) struct TaskPool<T> {
 }
 
 impl<T> TaskPool<T> {
-    pub(crate) fn new(sender: Sender<T>) -> TaskPool<T> {
+    pub(crate) fn new_with_threads(sender: Sender<T>, threads: usize) -> TaskPool<T> {
         const STACK_SIZE: usize = 8 * 1024 * 1024;
 
         let inner = threadpool::Builder::new()
             .thread_name("Worker".into())
             .thread_stack_size(STACK_SIZE)
+            .num_threads(threads)
             .build();
         TaskPool { sender, inner }
     }
diff --git a/crates/rust-analyzer/src/to_proto.rs b/crates/rust-analyzer/src/to_proto.rs
index 81cc1952ba..e736b2ff9a 100644
--- a/crates/rust-analyzer/src/to_proto.rs
+++ b/crates/rust-analyzer/src/to_proto.rs
@@ -228,7 +228,7 @@ fn completion_item(
     max_relevance: u32,
     item: CompletionItem,
 ) {
-    let insert_replace_support = config.insert_replace_support().then(|| tdpp.position);
+    let insert_replace_support = config.insert_replace_support().then_some(tdpp.position);
     let mut additional_text_edits = Vec::new();
 
     // LSP does not allow arbitrary edits in completion, so we have to do a
@@ -258,7 +258,7 @@ fn completion_item(
         text_edit.unwrap()
     };
 
-    let insert_text_format = item.is_snippet().then(|| lsp_types::InsertTextFormat::SNIPPET);
+    let insert_text_format = item.is_snippet().then_some(lsp_types::InsertTextFormat::SNIPPET);
     let tags = item.deprecated().then(|| vec![lsp_types::CompletionItemTag::DEPRECATED]);
     let command = if item.trigger_call_info() && config.client_commands().trigger_parameter_hints {
         Some(command::trigger_parameter_hints())
@@ -342,7 +342,7 @@ fn completion_item(
         // by the client. Hex format is used because it is easier to
         // visually compare very large values, which the sort text
         // tends to be since it is the opposite of the score.
-        res.sort_text = Some(format!("{:08x}", sort_score));
+        res.sort_text = Some(format!("{sort_score:08x}"));
     }
 }
 
@@ -434,42 +434,52 @@ pub(crate) fn inlay_hint(
         InlayKind::ParameterHint if render_colons => inlay_hint.label.append_str(":"),
         InlayKind::TypeHint if render_colons => inlay_hint.label.prepend_str(": "),
         InlayKind::ClosureReturnTypeHint => inlay_hint.label.prepend_str(" -> "),
+        InlayKind::DiscriminantHint => inlay_hint.label.prepend_str(" = "),
         _ => {}
     }
 
     Ok(lsp_types::InlayHint {
         position: match inlay_hint.kind {
             // before annotated thing
-            InlayKind::ParameterHint | InlayKind::AdjustmentHint | InlayKind::BindingModeHint => {
-                position(line_index, inlay_hint.range.start())
-            }
+            InlayKind::OpeningParenthesis
+            | InlayKind::ParameterHint
+            | InlayKind::AdjustmentHint
+            | InlayKind::BindingModeHint => position(line_index, inlay_hint.range.start()),
             // after annotated thing
             InlayKind::ClosureReturnTypeHint
             | InlayKind::TypeHint
+            | InlayKind::DiscriminantHint
             | InlayKind::ChainingHint
             | InlayKind::GenericParamListHint
-            | InlayKind::AdjustmentHintClosingParenthesis
+            | InlayKind::ClosingParenthesis
+            | InlayKind::AdjustmentHintPostfix
             | InlayKind::LifetimeHint
             | InlayKind::ClosingBraceHint => position(line_index, inlay_hint.range.end()),
         },
         padding_left: Some(match inlay_hint.kind {
             InlayKind::TypeHint => !render_colons,
             InlayKind::ChainingHint | InlayKind::ClosingBraceHint => true,
-            InlayKind::AdjustmentHintClosingParenthesis
+            InlayKind::ClosingParenthesis
+            | InlayKind::DiscriminantHint
+            | InlayKind::OpeningParenthesis
             | InlayKind::BindingModeHint
             | InlayKind::ClosureReturnTypeHint
             | InlayKind::GenericParamListHint
             | InlayKind::AdjustmentHint
+            | InlayKind::AdjustmentHintPostfix
             | InlayKind::LifetimeHint
             | InlayKind::ParameterHint => false,
         }),
         padding_right: Some(match inlay_hint.kind {
-            InlayKind::AdjustmentHintClosingParenthesis
+            InlayKind::ClosingParenthesis
+            | InlayKind::OpeningParenthesis
             | InlayKind::ChainingHint
             | InlayKind::ClosureReturnTypeHint
             | InlayKind::GenericParamListHint
             | InlayKind::AdjustmentHint
+            | InlayKind::AdjustmentHintPostfix
             | InlayKind::TypeHint
+            | InlayKind::DiscriminantHint
             | InlayKind::ClosingBraceHint => false,
             InlayKind::BindingModeHint => inlay_hint.label.as_simple_str() != Some("&"),
             InlayKind::ParameterHint | InlayKind::LifetimeHint => true,
@@ -479,11 +489,14 @@ pub(crate) fn inlay_hint(
             InlayKind::ClosureReturnTypeHint | InlayKind::TypeHint | InlayKind::ChainingHint => {
                 Some(lsp_types::InlayHintKind::TYPE)
             }
-            InlayKind::AdjustmentHintClosingParenthesis
+            InlayKind::ClosingParenthesis
+            | InlayKind::DiscriminantHint
+            | InlayKind::OpeningParenthesis
             | InlayKind::BindingModeHint
             | InlayKind::GenericParamListHint
             | InlayKind::LifetimeHint
             | InlayKind::AdjustmentHint
+            | InlayKind::AdjustmentHintPostfix
             | InlayKind::ClosingBraceHint => None,
         },
         text_edits: None,
@@ -492,7 +505,10 @@ pub(crate) fn inlay_hint(
                 let uri = url(snap, file_id);
                 let line_index = snap.file_line_index(file_id).ok()?;
 
-                let text_document = lsp_types::TextDocumentIdentifier { uri };
+                let text_document = lsp_types::VersionedTextDocumentIdentifier {
+                    version: snap.url_file_version(&uri)?,
+                    uri,
+                };
                 to_value(lsp_ext::InlayHintResolveData {
                     text_document,
                     position: lsp_ext::PositionOrRange::Position(position(&line_index, offset)),
@@ -501,7 +517,10 @@ pub(crate) fn inlay_hint(
             }
             Some(ide::InlayTooltip::HoverRanged(file_id, text_range)) => {
                 let uri = url(snap, file_id);
-                let text_document = lsp_types::TextDocumentIdentifier { uri };
+                let text_document = lsp_types::VersionedTextDocumentIdentifier {
+                    version: snap.url_file_version(&uri)?,
+                    uri,
+                };
                 let line_index = snap.file_line_index(file_id).ok()?;
                 to_value(lsp_ext::InlayHintResolveData {
                     text_document,
@@ -1103,7 +1122,7 @@ pub(crate) fn code_action(
         (Some(it), _) => res.edit = Some(snippet_workspace_edit(snap, it)?),
         (None, Some((index, code_action_params))) => {
             res.data = Some(lsp_ext::CodeActionData {
-                id: format!("{}:{}:{}", assist.id.0, assist.id.1.name(), index),
+                id: format!("{}:{}:{index}", assist.id.0, assist.id.1.name()),
                 code_action_params,
             });
         }
@@ -1164,7 +1183,10 @@ pub(crate) fn code_lens(
             let r = runnable(snap, run)?;
 
             let lens_config = snap.config.lens();
-            if lens_config.run && client_commands_config.run_single {
+            if lens_config.run
+                && client_commands_config.run_single
+                && r.args.workspace_root.is_some()
+            {
                 let command = command::run_single(&r, &title);
                 acc.push(lsp_types::CodeLens {
                     range: annotation_range,
@@ -1339,7 +1361,7 @@ pub(crate) fn implementation_title(count: usize) -> String {
     if count == 1 {
         "1 implementation".into()
     } else {
-        format!("{} implementations", count)
+        format!("{count} implementations")
     }
 }
 
@@ -1347,7 +1369,7 @@ pub(crate) fn reference_title(count: usize) -> String {
     if count == 1 {
         "1 reference".into()
     } else {
-        format!("{} references", count)
+        format!("{count} references")
     }
 }
 
diff --git a/crates/rust-analyzer/tests/slow-tests/main.rs b/crates/rust-analyzer/tests/slow-tests/main.rs
index fa55f7d90c..5e3e19d44d 100644
--- a/crates/rust-analyzer/tests/slow-tests/main.rs
+++ b/crates/rust-analyzer/tests/slow-tests/main.rs
@@ -263,7 +263,7 @@ mod tests {
     for runnable in ["consumer", "dependency", "devdependency"] {
         server.request::<Runnables>(
             RunnablesParams {
-                text_document: server.doc_id(&format!("{}/src/lib.rs", runnable)),
+                text_document: server.doc_id(&format!("{runnable}/src/lib.rs")),
                 position: None,
             },
             json!([
@@ -528,14 +528,13 @@ fn test_missing_module_code_action_in_json_project() {
     let code = format!(
         r#"
 //- /rust-project.json
-{PROJECT}
+{project}
 
 //- /src/lib.rs
 mod bar;
 
 fn main() {{}}
 "#,
-        PROJECT = project,
     );
 
     let server =
@@ -595,8 +594,8 @@ fn diagnostics_dont_block_typing() {
         return;
     }
 
-    let librs: String = (0..10).map(|i| format!("mod m{};", i)).collect();
-    let libs: String = (0..10).map(|i| format!("//- /src/m{}.rs\nfn foo() {{}}\n\n", i)).collect();
+    let librs: String = (0..10).map(|i| format!("mod m{i};")).collect();
+    let libs: String = (0..10).map(|i| format!("//- /src/m{i}.rs\nfn foo() {{}}\n\n")).collect();
     let server = Project::with_fixture(&format!(
         r#"
 //- /Cargo.toml
@@ -605,13 +604,12 @@ name = "foo"
 version = "0.0.0"
 
 //- /src/lib.rs
-{}
+{librs}
 
-{}
+{libs}
 
 fn main() {{}}
-"#,
-        librs, libs
+"#
     ))
     .with_config(serde_json::json!({
         "cargo": { "sysroot": "discover" }
@@ -622,7 +620,7 @@ fn main() {{}}
     for i in 0..10 {
         server.notification::<DidOpenTextDocument>(DidOpenTextDocumentParams {
             text_document: TextDocumentItem {
-                uri: server.doc_id(&format!("src/m{}.rs", i)).uri,
+                uri: server.doc_id(&format!("src/m{i}.rs")).uri,
                 language_id: "rust".to_string(),
                 version: 0,
                 text: "/// Docs\nfn foo() {}".to_string(),
@@ -645,7 +643,7 @@ fn main() {{}}
         }]),
     );
     let elapsed = start.elapsed();
-    assert!(elapsed.as_millis() < 2000, "typing enter took {:?}", elapsed);
+    assert!(elapsed.as_millis() < 2000, "typing enter took {elapsed:?}");
 }
 
 #[test]
@@ -942,7 +940,7 @@ fn test_will_rename_files_same_level() {
     let tmp_dir = TestDir::new();
     let tmp_dir_path = tmp_dir.path().to_owned();
     let tmp_dir_str = tmp_dir_path.to_str().unwrap();
-    let base_path = PathBuf::from(format!("file://{}", tmp_dir_str));
+    let base_path = PathBuf::from(format!("file://{tmp_dir_str}"));
 
     let code = r#"
 //- /Cargo.toml
diff --git a/crates/rust-analyzer/tests/slow-tests/sourcegen.rs b/crates/rust-analyzer/tests/slow-tests/sourcegen.rs
index e6ac018a05..2eafb0da69 100644
--- a/crates/rust-analyzer/tests/slow-tests/sourcegen.rs
+++ b/crates/rust-analyzer/tests/slow-tests/sourcegen.rs
@@ -14,7 +14,7 @@ fn sourcegen_feature_docs() {
         contents.trim()
     );
     let dst = sourcegen::project_root().join("docs/user/generated_features.adoc");
-    fs::write(&dst, &contents).unwrap();
+    fs::write(dst, contents).unwrap();
 }
 
 #[derive(Debug)]
@@ -42,7 +42,7 @@ impl Feature {
             for block in comment_blocks {
                 let id = block.id;
                 if let Err(msg) = is_valid_feature_name(&id) {
-                    panic!("invalid feature name: {:?}:\n  {}", id, msg)
+                    panic!("invalid feature name: {id:?}:\n  {msg}")
                 }
                 let doc = block.contents.join("\n");
                 let location = sourcegen::Location { file: path.clone(), line: block.line };
@@ -63,11 +63,11 @@ fn is_valid_feature_name(feature: &str) -> Result<(), String> {
         }
         for short in ["To", "And"] {
             if word == short {
-                return Err(format!("Don't capitalize {:?}", word));
+                return Err(format!("Don't capitalize {word:?}"));
             }
         }
         if !word.starts_with(char::is_uppercase) {
-            return Err(format!("Capitalize {:?}", word));
+            return Err(format!("Capitalize {word:?}"));
         }
     }
     Ok(())
diff --git a/crates/rust-analyzer/tests/slow-tests/support.rs b/crates/rust-analyzer/tests/slow-tests/support.rs
index 7257445dab..269212ebb9 100644
--- a/crates/rust-analyzer/tests/slow-tests/support.rs
+++ b/crates/rust-analyzer/tests/slow-tests/support.rs
@@ -216,7 +216,7 @@ impl Server {
     fn send_request_(&self, r: Request) -> Value {
         let id = r.id.clone();
         self.client.sender.send(r.clone().into()).unwrap();
-        while let Some(msg) = self.recv().unwrap_or_else(|Timeout| panic!("timeout: {:?}", r)) {
+        while let Some(msg) = self.recv().unwrap_or_else(|Timeout| panic!("timeout: {r:?}")) {
             match msg {
                 Message::Request(req) => {
                     if req.method == "client/registerCapability" {
@@ -228,19 +228,19 @@ impl Server {
                             continue;
                         }
                     }
-                    panic!("unexpected request: {:?}", req)
+                    panic!("unexpected request: {req:?}")
                 }
                 Message::Notification(_) => (),
                 Message::Response(res) => {
                     assert_eq!(res.id, id);
                     if let Some(err) = res.error {
-                        panic!("error response: {:#?}", err);
+                        panic!("error response: {err:#?}");
                     }
                     return res.result.unwrap();
                 }
             }
         }
-        panic!("no response for {:?}", r);
+        panic!("no response for {r:?}");
     }
     pub(crate) fn wait_until_workspace_is_loaded(self) -> Server {
         self.wait_for_message_cond(1, &|msg: &Message| match msg {
diff --git a/crates/rust-analyzer/tests/slow-tests/testdir.rs b/crates/rust-analyzer/tests/slow-tests/testdir.rs
index 3bec23a911..f7fceb5888 100644
--- a/crates/rust-analyzer/tests/slow-tests/testdir.rs
+++ b/crates/rust-analyzer/tests/slow-tests/testdir.rs
@@ -28,7 +28,7 @@ impl TestDir {
         static CNT: AtomicUsize = AtomicUsize::new(0);
         for _ in 0..100 {
             let cnt = CNT.fetch_add(1, Ordering::Relaxed);
-            let path = base.join(format!("{}_{}", pid, cnt));
+            let path = base.join(format!("{pid}_{cnt}"));
             if path.is_dir() {
                 continue;
             }
@@ -53,7 +53,7 @@ impl Drop for TestDir {
             return;
         }
         remove_dir_all(&self.path).unwrap_or_else(|err| {
-            panic!("failed to remove temporary directory {}: {}", self.path.display(), err)
+            panic!("failed to remove temporary directory {}: {err}", self.path.display())
         })
     }
 }
diff --git a/crates/rust-analyzer/tests/slow-tests/tidy.rs b/crates/rust-analyzer/tests/slow-tests/tidy.rs
index 24e68eca67..35b5af7319 100644
--- a/crates/rust-analyzer/tests/slow-tests/tidy.rs
+++ b/crates/rust-analyzer/tests/slow-tests/tidy.rs
@@ -56,12 +56,11 @@ fn check_lsp_extensions_docs() {
             "
 lsp_ext.rs was changed without touching lsp-extensions.md.
 
-Expected hash: {:x}
-Actual hash:   {:x}
+Expected hash: {expected_hash:x}
+Actual hash:   {actual_hash:x}
 
 Please adjust docs/dev/lsp-extensions.md.
-",
-            expected_hash, actual_hash
+"
         )
     }
 }
@@ -194,6 +193,7 @@ MIT OR Apache-2.0
 MIT OR Apache-2.0 OR Zlib
 MIT OR Zlib OR Apache-2.0
 MIT/Apache-2.0
+Unlicense OR MIT
 Unlicense/MIT
 Zlib OR Apache-2.0 OR MIT
 "
@@ -216,18 +216,18 @@ Zlib OR Apache-2.0 OR MIT
         diff.push_str("New Licenses:\n");
         for &l in licenses.iter() {
             if !expected.contains(&l) {
-                diff += &format!("  {}\n", l)
+                diff += &format!("  {l}\n")
             }
         }
 
         diff.push_str("\nMissing Licenses:\n");
         for &l in expected.iter() {
             if !licenses.contains(&l) {
-                diff += &format!("  {}\n", l)
+                diff += &format!("  {l}\n")
             }
         }
 
-        panic!("different set of licenses!\n{}", diff);
+        panic!("different set of licenses!\n{diff}");
     }
     assert_eq!(licenses, expected);
 }
@@ -316,7 +316,7 @@ fn check_test_attrs(path: &Path, text: &str) {
         "ide-assists/src/tests/generated.rs",
     ];
     if text.contains("#[ignore") && !need_ignore.iter().any(|p| path.ends_with(p)) {
-        panic!("\ndon't `#[ignore]` tests, see:\n\n    {}\n\n   {}\n", ignore_rule, path.display(),)
+        panic!("\ndon't `#[ignore]` tests, see:\n\n    {ignore_rule}\n\n   {}\n", path.display(),)
     }
 
     let panic_rule =
@@ -438,7 +438,7 @@ impl TidyMarks {
             self.hits.symmetric_difference(&self.checks).map(|it| it.as_str()).collect();
 
         if !diff.is_empty() {
-            panic!("unpaired marks: {:?}", diff)
+            panic!("unpaired marks: {diff:?}")
         }
     }
 }
diff --git a/crates/sourcegen/src/lib.rs b/crates/sourcegen/src/lib.rs
index 4e0ee63f32..72d26635c3 100644
--- a/crates/sourcegen/src/lib.rs
+++ b/crates/sourcegen/src/lib.rs
@@ -57,7 +57,7 @@ impl CommentBlock {
     pub fn extract(tag: &str, text: &str) -> Vec<CommentBlock> {
         assert!(tag.starts_with(char::is_uppercase));
 
-        let tag = format!("{}:", tag);
+        let tag = format!("{tag}:");
         // Would be nice if we had `.retain_mut` here!
         CommentBlock::extract_untagged(text)
             .into_iter()
@@ -65,10 +65,7 @@ impl CommentBlock {
                 let first = block.contents.remove(0);
                 first.strip_prefix(&tag).map(|id| {
                     if block.is_doc {
-                        panic!(
-                            "Use plain (non-doc) comments with tags like {}:\n    {}",
-                            tag, first
-                        );
+                        panic!("Use plain (non-doc) comments with tags like {tag}:\n    {first}");
                     }
 
                     block.id = id.trim().to_string();
@@ -122,7 +119,7 @@ pub struct Location {
 
 impl fmt::Display for Location {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        let path = self.file.strip_prefix(&project_root()).unwrap().display().to_string();
+        let path = self.file.strip_prefix(project_root()).unwrap().display().to_string();
         let path = path.replace('\\', "/");
         let name = self.file.file_name().unwrap();
         write!(
@@ -163,7 +160,7 @@ pub fn reformat(text: String) -> String {
 }
 
 pub fn add_preamble(generator: &'static str, mut text: String) -> String {
-    let preamble = format!("//! Generated by `{}`, do not edit by hand.\n\n", generator);
+    let preamble = format!("//! Generated by `{generator}`, do not edit by hand.\n\n");
     text.insert_str(0, &preamble);
     text
 }
@@ -178,7 +175,7 @@ pub fn ensure_file_contents(file: &Path, contents: &str) {
         }
     }
 
-    let display_path = file.strip_prefix(&project_root()).unwrap_or(file);
+    let display_path = file.strip_prefix(project_root()).unwrap_or(file);
     eprintln!(
         "\n\x1b[31;1merror\x1b[0m: {} was not up-to-date, updating\n",
         display_path.display()
diff --git a/crates/stdx/src/hash.rs b/crates/stdx/src/hash.rs
index 9909d71bdf..0c21d2674b 100644
--- a/crates/stdx/src/hash.rs
+++ b/crates/stdx/src/hash.rs
@@ -51,7 +51,7 @@ impl Hasher for NoHashHasher {
     }
 
     fn write_u64(&mut self, i: u64) {
-        self.0 = i as u64;
+        self.0 = i;
     }
 
     fn write_usize(&mut self, i: usize) {
diff --git a/crates/stdx/src/panic_context.rs b/crates/stdx/src/panic_context.rs
index f8fafc5a67..c3e8813b0e 100644
--- a/crates/stdx/src/panic_context.rs
+++ b/crates/stdx/src/panic_context.rs
@@ -25,7 +25,7 @@ impl PanicContext {
                 if !ctx.is_empty() {
                     eprintln!("Panic context:");
                     for frame in ctx.iter() {
-                        eprintln!("> {}\n", frame);
+                        eprintln!("> {frame}\n");
                     }
                 }
                 default_hook(panic_info);
@@ -45,5 +45,5 @@ fn with_ctx(f: impl FnOnce(&mut Vec<String>)) {
     thread_local! {
         static CTX: RefCell<Vec<String>> = RefCell::new(Vec::new());
     }
-    CTX.with(|ctx| f(&mut *ctx.borrow_mut()));
+    CTX.with(|ctx| f(&mut ctx.borrow_mut()));
 }
diff --git a/crates/syntax/rust.ungram b/crates/syntax/rust.ungram
index 0a0cb0290d..2c67586a39 100644
--- a/crates/syntax/rust.ungram
+++ b/crates/syntax/rust.ungram
@@ -359,6 +359,7 @@ Expr =
 | TupleExpr
 | WhileExpr
 | YieldExpr
+| YeetExpr
 | LetExpr
 | UnderscoreExpr
 
@@ -503,6 +504,9 @@ ReturnExpr =
 YieldExpr =
   Attr* 'yield' Expr?
 
+YeetExpr =
+  Attr* 'do' 'yeet' Expr?
+
 LetExpr =
   Attr* 'let' Pat '=' Expr
 
diff --git a/crates/syntax/src/algo.rs b/crates/syntax/src/algo.rs
index 8b14789dd9..c402a7bcea 100644
--- a/crates/syntax/src/algo.rs
+++ b/crates/syntax/src/algo.rs
@@ -616,7 +616,7 @@ fn main() {
 
         let fmt_syntax = |syn: &SyntaxElement| match syn.kind() {
             SyntaxKind::WHITESPACE => format!("{:?}", syn.to_string()),
-            _ => format!("{}", syn),
+            _ => format!("{syn}"),
         };
 
         let insertions =
@@ -637,7 +637,7 @@ fn main() {
             .iter()
             .sorted_by_key(|(syntax, _)| syntax.text_range().start())
             .format_with("\n", |(k, v), f| {
-                f(&format!("Line {}: {:?} -> {}", line_number(k), k, fmt_syntax(v)))
+                f(&format!("Line {}: {k:?} -> {}", line_number(k), fmt_syntax(v)))
             });
 
         let deletions = diff
@@ -646,8 +646,7 @@ fn main() {
             .format_with("\n", |v, f| f(&format!("Line {}: {}", line_number(v), &fmt_syntax(v))));
 
         let actual = format!(
-            "insertions:\n\n{}\n\nreplacements:\n\n{}\n\ndeletions:\n\n{}\n",
-            insertions, replacements, deletions
+            "insertions:\n\n{insertions}\n\nreplacements:\n\n{replacements}\n\ndeletions:\n\n{deletions}\n"
         );
         expected_diff.assert_eq(&actual);
 
diff --git a/crates/syntax/src/ast.rs b/crates/syntax/src/ast.rs
index 4aa64d0d6e..10c0457583 100644
--- a/crates/syntax/src/ast.rs
+++ b/crates/syntax/src/ast.rs
@@ -9,6 +9,7 @@ mod operators;
 pub mod edit;
 pub mod edit_in_place;
 pub mod make;
+pub mod prec;
 
 use std::marker::PhantomData;
 
diff --git a/crates/syntax/src/ast/edit.rs b/crates/syntax/src/ast/edit.rs
index 15805dfc86..5bc6b780e4 100644
--- a/crates/syntax/src/ast/edit.rs
+++ b/crates/syntax/src/ast/edit.rs
@@ -87,7 +87,7 @@ impl IndentLevel {
         for token in tokens {
             if let Some(ws) = ast::Whitespace::cast(token) {
                 if ws.text().contains('\n') {
-                    let new_ws = make::tokens::whitespace(&format!("{}{}", ws.syntax(), self));
+                    let new_ws = make::tokens::whitespace(&format!("{}{self}", ws.syntax()));
                     ted::replace(ws.syntax(), &new_ws);
                 }
             }
@@ -103,7 +103,7 @@ impl IndentLevel {
             if let Some(ws) = ast::Whitespace::cast(token) {
                 if ws.text().contains('\n') {
                     let new_ws = make::tokens::whitespace(
-                        &ws.syntax().text().replace(&format!("\n{}", self), "\n"),
+                        &ws.syntax().text().replace(&format!("\n{self}"), "\n"),
                     );
                     ted::replace(ws.syntax(), &new_ws);
                 }
diff --git a/crates/syntax/src/ast/edit_in_place.rs b/crates/syntax/src/ast/edit_in_place.rs
index 660c057e99..a493c92e7d 100644
--- a/crates/syntax/src/ast/edit_in_place.rs
+++ b/crates/syntax/src/ast/edit_in_place.rs
@@ -481,7 +481,7 @@ impl ast::AssocItemList {
             },
         };
         let elements: Vec<SyntaxElement<_>> = vec![
-            make::tokens::whitespace(&format!("{}{}", whitespace, indent)).into(),
+            make::tokens::whitespace(&format!("{whitespace}{indent}")).into(),
             item.syntax().clone().into(),
         ];
         ted::insert_all(position, elements);
@@ -537,7 +537,7 @@ impl ast::MatchArmList {
             },
         };
         let indent = IndentLevel::from_node(self.syntax()) + 1;
-        elements.push(make::tokens::whitespace(&format!("\n{}", indent)).into());
+        elements.push(make::tokens::whitespace(&format!("\n{indent}")).into());
         elements.push(arm.syntax().clone().into());
         if needs_comma(&arm) {
             ted::append_child(arm.syntax(), make::token(SyntaxKind::COMMA));
@@ -555,7 +555,7 @@ impl ast::RecordExprFieldList {
         let is_multiline = self.syntax().text().contains_char('\n');
         let whitespace = if is_multiline {
             let indent = IndentLevel::from_node(self.syntax()) + 1;
-            make::tokens::whitespace(&format!("\n{}", indent))
+            make::tokens::whitespace(&format!("\n{indent}"))
         } else {
             make::tokens::single_space()
         };
@@ -616,7 +616,7 @@ impl ast::RecordPatFieldList {
         let is_multiline = self.syntax().text().contains_char('\n');
         let whitespace = if is_multiline {
             let indent = IndentLevel::from_node(self.syntax()) + 1;
-            make::tokens::whitespace(&format!("\n{}", indent))
+            make::tokens::whitespace(&format!("\n{indent}"))
         } else {
             make::tokens::single_space()
         };
@@ -681,7 +681,7 @@ impl ast::VariantList {
             },
         };
         let elements: Vec<SyntaxElement<_>> = vec![
-            make::tokens::whitespace(&format!("{}{}", "\n", indent)).into(),
+            make::tokens::whitespace(&format!("{}{indent}", "\n")).into(),
             variant.syntax().clone().into(),
             ast::make::token(T![,]).into(),
         ];
@@ -704,11 +704,11 @@ fn normalize_ws_between_braces(node: &SyntaxNode) -> Option<()> {
     match l.next_sibling_or_token() {
         Some(ws) if ws.kind() == SyntaxKind::WHITESPACE => {
             if ws.next_sibling_or_token()?.into_token()? == r {
-                ted::replace(ws, make::tokens::whitespace(&format!("\n{}", indent)));
+                ted::replace(ws, make::tokens::whitespace(&format!("\n{indent}")));
             }
         }
         Some(ws) if ws.kind() == T!['}'] => {
-            ted::insert(Position::after(l), make::tokens::whitespace(&format!("\n{}", indent)));
+            ted::insert(Position::after(l), make::tokens::whitespace(&format!("\n{indent}")));
         }
         _ => (),
     }
@@ -888,6 +888,6 @@ enum Foo {
         let enum_ = ast_mut_from_text::<ast::Enum>(before);
         enum_.variant_list().map(|it| it.add_variant(variant));
         let after = enum_.to_string();
-        assert_eq_text!(&trim_indent(expected.trim()), &trim_indent(&after.trim()));
+        assert_eq_text!(&trim_indent(expected.trim()), &trim_indent(after.trim()));
     }
 }
diff --git a/crates/syntax/src/ast/generated/nodes.rs b/crates/syntax/src/ast/generated/nodes.rs
index 2ea715f47f..a214a5e446 100644
--- a/crates/syntax/src/ast/generated/nodes.rs
+++ b/crates/syntax/src/ast/generated/nodes.rs
@@ -1063,6 +1063,17 @@ impl YieldExpr {
     pub fn expr(&self) -> Option<Expr> { support::child(&self.syntax) }
 }
 
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct YeetExpr {
+    pub(crate) syntax: SyntaxNode,
+}
+impl ast::HasAttrs for YeetExpr {}
+impl YeetExpr {
+    pub fn do_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![do]) }
+    pub fn yeet_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![yeet]) }
+    pub fn expr(&self) -> Option<Expr> { support::child(&self.syntax) }
+}
+
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub struct LetExpr {
     pub(crate) syntax: SyntaxNode,
@@ -1541,6 +1552,7 @@ pub enum Expr {
     TupleExpr(TupleExpr),
     WhileExpr(WhileExpr),
     YieldExpr(YieldExpr),
+    YeetExpr(YeetExpr),
     LetExpr(LetExpr),
     UnderscoreExpr(UnderscoreExpr),
 }
@@ -2694,6 +2706,17 @@ impl AstNode for YieldExpr {
     }
     fn syntax(&self) -> &SyntaxNode { &self.syntax }
 }
+impl AstNode for YeetExpr {
+    fn can_cast(kind: SyntaxKind) -> bool { kind == YEET_EXPR }
+    fn cast(syntax: SyntaxNode) -> Option<Self> {
+        if Self::can_cast(syntax.kind()) {
+            Some(Self { syntax })
+        } else {
+            None
+        }
+    }
+    fn syntax(&self) -> &SyntaxNode { &self.syntax }
+}
 impl AstNode for LetExpr {
     fn can_cast(kind: SyntaxKind) -> bool { kind == LET_EXPR }
     fn cast(syntax: SyntaxNode) -> Option<Self> {
@@ -3382,6 +3405,9 @@ impl From<WhileExpr> for Expr {
 impl From<YieldExpr> for Expr {
     fn from(node: YieldExpr) -> Expr { Expr::YieldExpr(node) }
 }
+impl From<YeetExpr> for Expr {
+    fn from(node: YeetExpr) -> Expr { Expr::YeetExpr(node) }
+}
 impl From<LetExpr> for Expr {
     fn from(node: LetExpr) -> Expr { Expr::LetExpr(node) }
 }
@@ -3422,6 +3448,7 @@ impl AstNode for Expr {
                 | TUPLE_EXPR
                 | WHILE_EXPR
                 | YIELD_EXPR
+                | YEET_EXPR
                 | LET_EXPR
                 | UNDERSCORE_EXPR
         )
@@ -3458,6 +3485,7 @@ impl AstNode for Expr {
             TUPLE_EXPR => Expr::TupleExpr(TupleExpr { syntax }),
             WHILE_EXPR => Expr::WhileExpr(WhileExpr { syntax }),
             YIELD_EXPR => Expr::YieldExpr(YieldExpr { syntax }),
+            YEET_EXPR => Expr::YeetExpr(YeetExpr { syntax }),
             LET_EXPR => Expr::LetExpr(LetExpr { syntax }),
             UNDERSCORE_EXPR => Expr::UnderscoreExpr(UnderscoreExpr { syntax }),
             _ => return None,
@@ -3496,6 +3524,7 @@ impl AstNode for Expr {
             Expr::TupleExpr(it) => &it.syntax,
             Expr::WhileExpr(it) => &it.syntax,
             Expr::YieldExpr(it) => &it.syntax,
+            Expr::YeetExpr(it) => &it.syntax,
             Expr::LetExpr(it) => &it.syntax,
             Expr::UnderscoreExpr(it) => &it.syntax,
         }
@@ -3892,7 +3921,7 @@ impl AnyHasArgList {
 impl AstNode for AnyHasArgList {
     fn can_cast(kind: SyntaxKind) -> bool { matches!(kind, CALL_EXPR | METHOD_CALL_EXPR) }
     fn cast(syntax: SyntaxNode) -> Option<Self> {
-        Self::can_cast(syntax.kind()).then(|| AnyHasArgList { syntax })
+        Self::can_cast(syntax.kind()).then_some(AnyHasArgList { syntax })
     }
     fn syntax(&self) -> &SyntaxNode { &self.syntax }
 }
@@ -3963,6 +3992,7 @@ impl AstNode for AnyHasAttrs {
                 | TUPLE_EXPR
                 | WHILE_EXPR
                 | YIELD_EXPR
+                | YEET_EXPR
                 | LET_EXPR
                 | UNDERSCORE_EXPR
                 | STMT_LIST
@@ -3976,7 +4006,7 @@ impl AstNode for AnyHasAttrs {
         )
     }
     fn cast(syntax: SyntaxNode) -> Option<Self> {
-        Self::can_cast(syntax.kind()).then(|| AnyHasAttrs { syntax })
+        Self::can_cast(syntax.kind()).then_some(AnyHasAttrs { syntax })
     }
     fn syntax(&self) -> &SyntaxNode { &self.syntax }
 }
@@ -4013,7 +4043,7 @@ impl AstNode for AnyHasDocComments {
         )
     }
     fn cast(syntax: SyntaxNode) -> Option<Self> {
-        Self::can_cast(syntax.kind()).then(|| AnyHasDocComments { syntax })
+        Self::can_cast(syntax.kind()).then_some(AnyHasDocComments { syntax })
     }
     fn syntax(&self) -> &SyntaxNode { &self.syntax }
 }
@@ -4028,7 +4058,7 @@ impl AstNode for AnyHasGenericParams {
         matches!(kind, ENUM | FN | IMPL | STRUCT | TRAIT | TYPE_ALIAS | UNION)
     }
     fn cast(syntax: SyntaxNode) -> Option<Self> {
-        Self::can_cast(syntax.kind()).then(|| AnyHasGenericParams { syntax })
+        Self::can_cast(syntax.kind()).then_some(AnyHasGenericParams { syntax })
     }
     fn syntax(&self) -> &SyntaxNode { &self.syntax }
 }
@@ -4041,7 +4071,7 @@ impl AnyHasLoopBody {
 impl AstNode for AnyHasLoopBody {
     fn can_cast(kind: SyntaxKind) -> bool { matches!(kind, FOR_EXPR | LOOP_EXPR | WHILE_EXPR) }
     fn cast(syntax: SyntaxNode) -> Option<Self> {
-        Self::can_cast(syntax.kind()).then(|| AnyHasLoopBody { syntax })
+        Self::can_cast(syntax.kind()).then_some(AnyHasLoopBody { syntax })
     }
     fn syntax(&self) -> &SyntaxNode { &self.syntax }
 }
@@ -4054,7 +4084,7 @@ impl AnyHasModuleItem {
 impl AstNode for AnyHasModuleItem {
     fn can_cast(kind: SyntaxKind) -> bool { matches!(kind, MACRO_ITEMS | SOURCE_FILE | ITEM_LIST) }
     fn cast(syntax: SyntaxNode) -> Option<Self> {
-        Self::can_cast(syntax.kind()).then(|| AnyHasModuleItem { syntax })
+        Self::can_cast(syntax.kind()).then_some(AnyHasModuleItem { syntax })
     }
     fn syntax(&self) -> &SyntaxNode { &self.syntax }
 }
@@ -4089,7 +4119,7 @@ impl AstNode for AnyHasName {
         )
     }
     fn cast(syntax: SyntaxNode) -> Option<Self> {
-        Self::can_cast(syntax.kind()).then(|| AnyHasName { syntax })
+        Self::can_cast(syntax.kind()).then_some(AnyHasName { syntax })
     }
     fn syntax(&self) -> &SyntaxNode { &self.syntax }
 }
@@ -4107,7 +4137,7 @@ impl AstNode for AnyHasTypeBounds {
         )
     }
     fn cast(syntax: SyntaxNode) -> Option<Self> {
-        Self::can_cast(syntax.kind()).then(|| AnyHasTypeBounds { syntax })
+        Self::can_cast(syntax.kind()).then_some(AnyHasTypeBounds { syntax })
     }
     fn syntax(&self) -> &SyntaxNode { &self.syntax }
 }
@@ -4141,7 +4171,7 @@ impl AstNode for AnyHasVisibility {
         )
     }
     fn cast(syntax: SyntaxNode) -> Option<Self> {
-        Self::can_cast(syntax.kind()).then(|| AnyHasVisibility { syntax })
+        Self::can_cast(syntax.kind()).then_some(AnyHasVisibility { syntax })
     }
     fn syntax(&self) -> &SyntaxNode { &self.syntax }
 }
@@ -4655,6 +4685,11 @@ impl std::fmt::Display for YieldExpr {
         std::fmt::Display::fmt(self.syntax(), f)
     }
 }
+impl std::fmt::Display for YeetExpr {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        std::fmt::Display::fmt(self.syntax(), f)
+    }
+}
 impl std::fmt::Display for LetExpr {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         std::fmt::Display::fmt(self.syntax(), f)
diff --git a/crates/syntax/src/ast/make.rs b/crates/syntax/src/ast/make.rs
index 8c26009add..d5b3296980 100644
--- a/crates/syntax/src/ast/make.rs
+++ b/crates/syntax/src/ast/make.rs
@@ -339,10 +339,10 @@ pub fn tail_only_block_expr(tail_expr: ast::Expr) -> ast::BlockExpr {
 }
 
 /// Ideally this function wouldn't exist since it involves manual indenting.
-/// It differs from `make::block_expr` by also supporting comments.
+/// It differs from `make::block_expr` by also supporting comments and whitespace.
 ///
 /// FIXME: replace usages of this with the mutable syntax tree API
-pub fn hacky_block_expr_with_comments(
+pub fn hacky_block_expr(
     elements: impl IntoIterator<Item = crate::SyntaxElement>,
     tail_expr: Option<ast::Expr>,
 ) -> ast::BlockExpr {
@@ -350,10 +350,17 @@ pub fn hacky_block_expr_with_comments(
     for node_or_token in elements.into_iter() {
         match node_or_token {
             rowan::NodeOrToken::Node(n) => format_to!(buf, "    {n}\n"),
-            rowan::NodeOrToken::Token(t) if t.kind() == SyntaxKind::COMMENT => {
-                format_to!(buf, "    {t}\n")
+            rowan::NodeOrToken::Token(t) => {
+                let kind = t.kind();
+                if kind == SyntaxKind::COMMENT {
+                    format_to!(buf, "    {t}\n")
+                } else if kind == SyntaxKind::WHITESPACE {
+                    let content = t.text().trim_matches(|c| c != '\n');
+                    if content.len() >= 1 {
+                        format_to!(buf, "{}", &content[1..])
+                    }
+                }
             }
-            _ => (),
         }
     }
     if let Some(tail_expr) = tail_expr {
@@ -719,12 +726,23 @@ pub fn param_list(
     ast_from_text(&list)
 }
 
-pub fn type_param(name: ast::Name, ty: Option<ast::TypeBoundList>) -> ast::TypeParam {
-    let bound = match ty {
-        Some(it) => format!(": {it}"),
-        None => String::new(),
-    };
-    ast_from_text(&format!("fn f<{name}{bound}>() {{ }}"))
+pub fn type_bound(bound: &str) -> ast::TypeBound {
+    ast_from_text(&format!("fn f<T: {bound}>() {{ }}"))
+}
+
+pub fn type_bound_list(
+    bounds: impl IntoIterator<Item = ast::TypeBound>,
+) -> Option<ast::TypeBoundList> {
+    let bounds = bounds.into_iter().map(|it| it.to_string()).unique().join(" + ");
+    if bounds.is_empty() {
+        return None;
+    }
+    Some(ast_from_text(&format!("fn f<T: {bounds}>() {{ }}")))
+}
+
+pub fn type_param(name: ast::Name, bounds: Option<ast::TypeBoundList>) -> ast::TypeParam {
+    let bounds = bounds.map_or_else(String::new, |it| format!(": {it}"));
+    ast_from_text(&format!("fn f<{name}{bounds}>() {{ }}"))
 }
 
 pub fn lifetime_param(lifetime: ast::Lifetime) -> ast::LifetimeParam {
diff --git a/crates/syntax/src/ast/prec.rs b/crates/syntax/src/ast/prec.rs
new file mode 100644
index 0000000000..4ec388914e
--- /dev/null
+++ b/crates/syntax/src/ast/prec.rs
@@ -0,0 +1,328 @@
+//! Precedence representation.
+
+use crate::{
+    ast::{self, BinaryOp, Expr, HasArgList},
+    match_ast, AstNode, SyntaxNode,
+};
+
+impl Expr {
+    // Implementation is based on
+    // - https://doc.rust-lang.org/reference/expressions.html#expression-precedence
+    // - https://matklad.github.io/2020/04/13/simple-but-powerful-pratt-parsing.html
+    // - rustc source, including, but not limited to
+    //   - https://github.com/rust-lang/rust/blob/b6852428a8ea9728369b64b9964cad8e258403d3/compiler/rustc_ast/src/util/parser.rs#L296
+
+    /// Returns `true` if `self` would need to be wrapped in parentheses given that its parent is `parent`.
+    pub fn needs_parens_in(&self, parent: SyntaxNode) -> bool {
+        match_ast! {
+            match parent {
+                ast::Expr(e) => self.needs_parens_in_expr(&e),
+                ast::Stmt(e) => self.needs_parens_in_stmt(Some(&e)),
+                ast::StmtList(_) => self.needs_parens_in_stmt(None),
+                ast::ArgList(_) => false,
+                ast::MatchArm(_) => false,
+                _ => false,
+            }
+        }
+    }
+
+    fn needs_parens_in_expr(&self, parent: &Expr) -> bool {
+        // Special-case block weirdness
+        if parent.child_is_followed_by_a_block() {
+            use Expr::*;
+            match self {
+                // Cases like `if return {}` (need parens or else `{}` is returned, instead of being `if`'s body)
+                ReturnExpr(e) if e.expr().is_none() => return true,
+                BreakExpr(e) if e.expr().is_none() => return true,
+                YieldExpr(e) if e.expr().is_none() => return true,
+
+                // Same but with `..{}`
+                RangeExpr(e) if matches!(e.end(), Some(BlockExpr(..))) => return true,
+
+                // Similarly with struct literals, e.g. `if S{} == 1 {}`
+                _ if self.contains_exterior_struct_lit() => return true,
+                _ => {}
+            }
+        }
+
+        // Special-case `return.f()`
+        if self.is_ret_like_with_no_value() && parent.is_postfix() {
+            return false;
+        }
+
+        if self.is_paren_like()
+            || parent.is_paren_like()
+            || self.is_prefix() && (parent.is_prefix() || !self.is_ordered_before(parent))
+            || self.is_postfix() && (parent.is_postfix() || self.is_ordered_before(parent))
+        {
+            return false;
+        }
+
+        let (left, right, inv) = match self.is_ordered_before(parent) {
+            true => (self, parent, false),
+            false => (parent, self, true),
+        };
+
+        let (_, left_right_bp) = left.binding_power();
+        let (right_left_bp, _) = right.binding_power();
+
+        (left_right_bp < right_left_bp) ^ inv
+    }
+
+    fn needs_parens_in_stmt(&self, stmt: Option<&ast::Stmt>) -> bool {
+        use Expr::*;
+
+        // Prevent false-positives in cases like `fn x() -> u8 { ({ 0 } + 1) }`,
+        // `{ { 0 } + 1 }` won't parse -- `{ 0 }` would be parsed as a self-contained stmt,
+        // leaving `+ 1` as a parse error.
+        let mut innermost = self.clone();
+        loop {
+            let next = match &innermost {
+                BinExpr(e) => e.lhs(),
+                CallExpr(e) => e.expr(),
+                CastExpr(e) => e.expr(),
+                IndexExpr(e) => e.base(),
+                _ => break,
+            };
+
+            if let Some(next) = next {
+                innermost = next;
+                if !innermost.requires_semi_to_be_stmt() {
+                    return true;
+                }
+            } else {
+                break;
+            }
+        }
+
+        // Not every expression can be followed by `else` in the `let-else`
+        if let Some(ast::Stmt::LetStmt(e)) = stmt {
+            if e.let_else().is_some() {
+                match self {
+                    BinExpr(e)
+                        if e.op_kind()
+                            .map(|op| matches!(op, BinaryOp::LogicOp(_)))
+                            .unwrap_or(false) =>
+                    {
+                        return true
+                    }
+                    _ if self.clone().trailing_brace().is_some() => return true,
+                    _ => {}
+                }
+            }
+        }
+
+        false
+    }
+
+    /// Returns left and right so-called "binding powers" of this expression.
+    fn binding_power(&self) -> (u8, u8) {
+        use ast::{ArithOp::*, BinaryOp::*, Expr::*, LogicOp::*};
+
+        match self {
+            // (0, 0)   -- paren-like/nullary
+            // (0, N)   -- prefix
+            // (N, 0)   -- postfix
+            // (N, N)   -- infix, requires parens
+            // (N, N+1) -- infix, left to right associative
+            // (N+1, N) -- infix, right to left associative
+            // N is odd
+            //
+            ContinueExpr(_) => (0, 0),
+
+            ClosureExpr(_) | ReturnExpr(_) | YieldExpr(_) | YeetExpr(_) | BreakExpr(_) => (0, 1),
+
+            RangeExpr(_) => (5, 5),
+
+            BinExpr(e) => {
+                // Return a dummy value if we don't know the op
+                let Some(op) = e.op_kind() else { return (0, 0) };
+                match op {
+                    Assignment { .. } => (4, 3),
+                    //
+                    // Ranges are here in order :)
+                    //
+                    LogicOp(op) => match op {
+                        Or => (7, 8),
+                        And => (9, 10),
+                    },
+                    CmpOp(_) => (11, 11),
+                    ArithOp(op) => match op {
+                        BitOr => (13, 14),
+                        BitXor => (15, 16),
+                        BitAnd => (17, 18),
+                        Shl | Shr => (19, 20),
+                        Add | Sub => (21, 22),
+                        Mul | Div | Rem => (23, 24),
+                    },
+                }
+            }
+
+            CastExpr(_) => (25, 26),
+
+            BoxExpr(_) | RefExpr(_) | LetExpr(_) | PrefixExpr(_) => (0, 27),
+
+            AwaitExpr(_) | CallExpr(_) | MethodCallExpr(_) | IndexExpr(_) | TryExpr(_)
+            | MacroExpr(_) => (29, 0),
+
+            FieldExpr(_) => (31, 32),
+
+            ArrayExpr(_) | TupleExpr(_) | Literal(_) | PathExpr(_) | ParenExpr(_) | IfExpr(_)
+            | WhileExpr(_) | ForExpr(_) | LoopExpr(_) | MatchExpr(_) | BlockExpr(_)
+            | RecordExpr(_) | UnderscoreExpr(_) => (0, 0),
+        }
+    }
+
+    fn is_paren_like(&self) -> bool {
+        matches!(self.binding_power(), (0, 0))
+    }
+
+    fn is_prefix(&self) -> bool {
+        matches!(self.binding_power(), (0, 1..))
+    }
+
+    fn is_postfix(&self) -> bool {
+        matches!(self.binding_power(), (1.., 0))
+    }
+
+    /// Returns `true` if this expression can't be a standalone statement.
+    fn requires_semi_to_be_stmt(&self) -> bool {
+        use Expr::*;
+        !matches!(
+            self,
+            IfExpr(..) | MatchExpr(..) | BlockExpr(..) | WhileExpr(..) | LoopExpr(..) | ForExpr(..)
+        )
+    }
+
+    /// If an expression ends with `}`, returns the innermost expression ending in this `}`.
+    fn trailing_brace(mut self) -> Option<Expr> {
+        use Expr::*;
+
+        loop {
+            let rhs = match self {
+                RefExpr(e) => e.expr(),
+                BinExpr(e) => e.rhs(),
+                BoxExpr(e) => e.expr(),
+                BreakExpr(e) => e.expr(),
+                LetExpr(e) => e.expr(),
+                RangeExpr(e) => e.end(),
+                ReturnExpr(e) => e.expr(),
+                PrefixExpr(e) => e.expr(),
+                YieldExpr(e) => e.expr(),
+                ClosureExpr(e) => e.body(),
+
+                BlockExpr(..) | ForExpr(..) | IfExpr(..) | LoopExpr(..) | MatchExpr(..)
+                | RecordExpr(..) | WhileExpr(..) => break Some(self),
+                _ => break None,
+            };
+
+            self = rhs?;
+        }
+    }
+
+    /// Expressions that syntactically contain an "exterior" struct literal i.e., not surrounded by any
+    /// parens or other delimiters, e.g., `X { y: 1 }`, `X { y: 1 }.method()`, `foo == X { y: 1 }` and
+    /// `X { y: 1 } == foo` all do, but `(X { y: 1 }) == foo` does not.
+    fn contains_exterior_struct_lit(&self) -> bool {
+        return contains_exterior_struct_lit_inner(self).is_some();
+
+        fn contains_exterior_struct_lit_inner(expr: &Expr) -> Option<()> {
+            use Expr::*;
+
+            match expr {
+                RecordExpr(..) => Some(()),
+
+                // X { y: 1 } + X { y: 2 }
+                BinExpr(e) => e
+                    .lhs()
+                    .as_ref()
+                    .and_then(contains_exterior_struct_lit_inner)
+                    .or_else(|| e.rhs().as_ref().and_then(contains_exterior_struct_lit_inner)),
+
+                // `&X { y: 1 }`, `X { y: 1 }.y`, `X { y: 1 }.bar(...)`, etc
+                IndexExpr(e) => contains_exterior_struct_lit_inner(&e.base()?),
+                AwaitExpr(e) => contains_exterior_struct_lit_inner(&e.expr()?),
+                PrefixExpr(e) => contains_exterior_struct_lit_inner(&e.expr()?),
+                CastExpr(e) => contains_exterior_struct_lit_inner(&e.expr()?),
+                FieldExpr(e) => contains_exterior_struct_lit_inner(&e.expr()?),
+                MethodCallExpr(e) => contains_exterior_struct_lit_inner(&e.receiver()?),
+
+                _ => None,
+            }
+        }
+    }
+
+    /// Returns true if self is one of `return`, `break`, `continue` or `yield` with **no associated value**.
+    fn is_ret_like_with_no_value(&self) -> bool {
+        use Expr::*;
+
+        match self {
+            ReturnExpr(e) => e.expr().is_none(),
+            BreakExpr(e) => e.expr().is_none(),
+            ContinueExpr(_) => true,
+            YieldExpr(e) => e.expr().is_none(),
+            _ => false,
+        }
+    }
+
+    fn is_ordered_before(&self, other: &Expr) -> bool {
+        use Expr::*;
+
+        return order(self) < order(other);
+
+        /// Returns text range that can be used to compare two expression for order (which goes first).
+        fn order(this: &Expr) -> rowan::TextSize {
+            // For non-paren-like operators: get the operator itself
+            let token = match this {
+                RangeExpr(e) => e.op_token(),
+                BinExpr(e) => e.op_token(),
+                CastExpr(e) => e.as_token(),
+                FieldExpr(e) => e.dot_token(),
+                AwaitExpr(e) => e.dot_token(),
+                BoxExpr(e) => e.box_token(),
+                BreakExpr(e) => e.break_token(),
+                CallExpr(e) => e.arg_list().and_then(|args| args.l_paren_token()),
+                ClosureExpr(e) => e.param_list().and_then(|params| params.l_paren_token()),
+                ContinueExpr(e) => e.continue_token(),
+                IndexExpr(e) => e.l_brack_token(),
+                MethodCallExpr(e) => e.dot_token(),
+                PrefixExpr(e) => e.op_token(),
+                RefExpr(e) => e.amp_token(),
+                ReturnExpr(e) => e.return_token(),
+                TryExpr(e) => e.question_mark_token(),
+                YieldExpr(e) => e.yield_token(),
+                YeetExpr(e) => e.do_token(),
+                LetExpr(e) => e.let_token(),
+
+                ArrayExpr(_) | TupleExpr(_) | Literal(_) | PathExpr(_) | ParenExpr(_)
+                | IfExpr(_) | WhileExpr(_) | ForExpr(_) | LoopExpr(_) | MatchExpr(_)
+                | BlockExpr(_) | RecordExpr(_) | UnderscoreExpr(_) | MacroExpr(_) => None,
+            };
+
+            token.map(|t| t.text_range()).unwrap_or_else(|| this.syntax().text_range()).start()
+        }
+    }
+
+    fn child_is_followed_by_a_block(&self) -> bool {
+        use Expr::*;
+
+        match self {
+            ArrayExpr(_) | AwaitExpr(_) | BlockExpr(_) | CallExpr(_) | CastExpr(_)
+            | ClosureExpr(_) | FieldExpr(_) | IndexExpr(_) | Literal(_) | LoopExpr(_)
+            | MacroExpr(_) | MethodCallExpr(_) | ParenExpr(_) | PathExpr(_) | RecordExpr(_)
+            | TryExpr(_) | TupleExpr(_) | UnderscoreExpr(_) => false,
+
+            // For BinExpr and RangeExpr this is technically wrong -- the child can be on the left...
+            BinExpr(_) | RangeExpr(_) | BoxExpr(_) | BreakExpr(_) | ContinueExpr(_)
+            | PrefixExpr(_) | RefExpr(_) | ReturnExpr(_) | YieldExpr(_) | YeetExpr(_)
+            | LetExpr(_) => self
+                .syntax()
+                .parent()
+                .and_then(Expr::cast)
+                .map(|e| e.child_is_followed_by_a_block())
+                .unwrap_or(false),
+
+            ForExpr(_) | IfExpr(_) | MatchExpr(_) | WhileExpr(_) => true,
+        }
+    }
+}
diff --git a/crates/syntax/src/ast/token_ext.rs b/crates/syntax/src/ast/token_ext.rs
index 8990f7a7d4..2cd312e7f4 100644
--- a/crates/syntax/src/ast/token_ext.rs
+++ b/crates/syntax/src/ast/token_ext.rs
@@ -436,9 +436,7 @@ mod tests {
 
     fn check_string_value<'a>(lit: &str, expected: impl Into<Option<&'a str>>) {
         assert_eq!(
-            ast::String { syntax: make::tokens::literal(&format!("\"{}\"", lit)) }
-                .value()
-                .as_deref(),
+            ast::String { syntax: make::tokens::literal(&format!("\"{lit}\"")) }.value().as_deref(),
             expected.into()
         );
     }
@@ -461,7 +459,7 @@ bcde", "abcde",
         expected: impl Into<Option<&'a [u8; N]>>,
     ) {
         assert_eq!(
-            ast::ByteString { syntax: make::tokens::literal(&format!("b\"{}\"", lit)) }
+            ast::ByteString { syntax: make::tokens::literal(&format!("b\"{lit}\"")) }
                 .value()
                 .as_deref(),
             expected.into().map(|value| &value[..])
@@ -483,7 +481,7 @@ bcde", b"abcde",
 
     #[test]
     fn test_value_underscores() {
-        check_float_value("3.141592653589793_f64", 3.141592653589793_f64);
+        check_float_value("1.234567891011121_f64", 1.234567891011121_f64);
         check_float_value("1__0.__0__f32", 10.0);
         check_int_value("0b__1_0_", 2);
         check_int_value("1_1_1_1_1_1", 111111);
diff --git a/crates/syntax/src/fuzz.rs b/crates/syntax/src/fuzz.rs
index 7c7a60d629..239a89f9b2 100644
--- a/crates/syntax/src/fuzz.rs
+++ b/crates/syntax/src/fuzz.rs
@@ -36,7 +36,7 @@ impl CheckReparse {
         let delete_len = usize::from_str(lines.next()?).ok()?;
         let insert = lines.next()?.to_string();
         let text = lines.collect::<Vec<_>>().join("\n");
-        let text = format!("{}{}{}", PREFIX, text, SUFFIX);
+        let text = format!("{PREFIX}{text}{SUFFIX}");
         text.get(delete_start..delete_start.checked_add(delete_len)?)?; // make sure delete is a valid range
         let delete =
             TextRange::at(delete_start.try_into().unwrap(), delete_len.try_into().unwrap());
@@ -60,8 +60,8 @@ impl CheckReparse {
                 eprint!("reparsed:\n{:#?}", new_parse.tree().syntax());
                 eprint!("full reparse:\n{:#?}", full_reparse.tree().syntax());
                 assert_eq!(
-                    format!("{:?}", a),
-                    format!("{:?}", b),
+                    format!("{a:?}"),
+                    format!("{b:?}"),
                     "different syntax tree produced by the full reparse"
                 );
             }
diff --git a/crates/syntax/src/hacks.rs b/crates/syntax/src/hacks.rs
index ec3d3d444c..a3023c3195 100644
--- a/crates/syntax/src/hacks.rs
+++ b/crates/syntax/src/hacks.rs
@@ -6,7 +6,7 @@ use crate::{ast, AstNode};
 
 pub fn parse_expr_from_str(s: &str) -> Option<ast::Expr> {
     let s = s.trim();
-    let file = ast::SourceFile::parse(&format!("const _: () = {};", s));
+    let file = ast::SourceFile::parse(&format!("const _: () = {s};"));
     let expr = file.syntax_node().descendants().find_map(ast::Expr::cast)?;
     if expr.syntax().text() != s {
         return None;
diff --git a/crates/syntax/src/ptr.rs b/crates/syntax/src/ptr.rs
index a886972fff..1d4a89201a 100644
--- a/crates/syntax/src/ptr.rs
+++ b/crates/syntax/src/ptr.rs
@@ -82,7 +82,7 @@ impl<N: AstNode> AstPtr<N> {
 
     /// Like `SyntaxNodePtr::cast` but the trait bounds work out.
     pub fn try_from_raw(raw: SyntaxNodePtr) -> Option<AstPtr<N>> {
-        N::can_cast(raw.kind()).then(|| AstPtr { raw, _ty: PhantomData })
+        N::can_cast(raw.kind()).then_some(AstPtr { raw, _ty: PhantomData })
     }
 }
 
diff --git a/crates/syntax/src/ted.rs b/crates/syntax/src/ted.rs
index a47b4b11c0..29788d05e8 100644
--- a/crates/syntax/src/ted.rs
+++ b/crates/syntax/src/ted.rs
@@ -157,7 +157,7 @@ fn ws_before(position: &Position, new: &SyntaxElement) -> Option<SyntaxToken> {
         if let Some(item_list) = prev.parent().and_then(ast::ItemList::cast) {
             let mut indent = IndentLevel::from_element(&item_list.syntax().clone().into());
             indent.0 += 1;
-            return Some(make::tokens::whitespace(&format!("\n{}", indent)));
+            return Some(make::tokens::whitespace(&format!("\n{indent}")));
         }
     }
 
@@ -165,7 +165,7 @@ fn ws_before(position: &Position, new: &SyntaxElement) -> Option<SyntaxToken> {
         if let Some(stmt_list) = prev.parent().and_then(ast::StmtList::cast) {
             let mut indent = IndentLevel::from_element(&stmt_list.syntax().clone().into());
             indent.0 += 1;
-            return Some(make::tokens::whitespace(&format!("\n{}", indent)));
+            return Some(make::tokens::whitespace(&format!("\n{indent}")));
         }
     }
 
@@ -200,7 +200,7 @@ fn ws_between(left: &SyntaxElement, right: &SyntaxElement) -> Option<SyntaxToken
         if left.kind() == SyntaxKind::USE {
             indent.0 = IndentLevel::from_element(right).0.max(indent.0);
         }
-        return Some(make::tokens::whitespace(&format!("\n{}", indent)));
+        return Some(make::tokens::whitespace(&format!("\n{indent}")));
     }
     Some(make::tokens::single_space())
 }
diff --git a/crates/syntax/src/tests.rs b/crates/syntax/src/tests.rs
index 58fba8cfa8..168439053c 100644
--- a/crates/syntax/src/tests.rs
+++ b/crates/syntax/src/tests.rs
@@ -108,7 +108,7 @@ fn self_hosting_parsing() {
             .into_iter()
             .map(|(path, err)| format!("{}: {:?}\n", path.display(), err[0]))
             .collect::<String>();
-        panic!("Parsing errors:\n{}\n", errors);
+        panic!("Parsing errors:\n{errors}\n");
     }
 }
 
@@ -157,7 +157,7 @@ fn collect_rust_files(root_dir: &Path, paths: &[&str]) -> Vec<(PathBuf, String)>
 /// Collects paths to all `.rs` files from `dir` in a sorted `Vec<PathBuf>`.
 fn rust_files_in_dir(dir: &Path) -> Vec<PathBuf> {
     let mut acc = Vec::new();
-    for file in fs::read_dir(&dir).unwrap() {
+    for file in fs::read_dir(dir).unwrap() {
         let file = file.unwrap();
         let path = file.path();
         if path.extension().unwrap_or_default() == "rs" {
@@ -181,6 +181,6 @@ fn rust_files_in_dir(dir: &Path) -> Vec<PathBuf> {
 /// so this should always be correct.
 fn read_text(path: &Path) -> String {
     fs::read_to_string(path)
-        .unwrap_or_else(|_| panic!("File at {:?} should be valid", path))
+        .unwrap_or_else(|_| panic!("File at {path:?} should be valid"))
         .replace("\r\n", "\n")
 }
diff --git a/crates/syntax/src/tests/ast_src.rs b/crates/syntax/src/tests/ast_src.rs
index cf5be1c30f..3ff6e03006 100644
--- a/crates/syntax/src/tests/ast_src.rs
+++ b/crates/syntax/src/tests/ast_src.rs
@@ -65,12 +65,12 @@ pub(crate) const KINDS_SRC: KindsSrc<'_> = KindsSrc {
         (">>=", "SHREQ"),
     ],
     keywords: &[
-        "as", "async", "await", "box", "break", "const", "continue", "crate", "dyn", "else",
+        "as", "async", "await", "box", "break", "const", "continue", "crate", "do", "dyn", "else",
         "enum", "extern", "false", "fn", "for", "if", "impl", "in", "let", "loop", "macro",
         "match", "mod", "move", "mut", "pub", "ref", "return", "self", "Self", "static", "struct",
         "super", "trait", "true", "try", "type", "unsafe", "use", "where", "while", "yield",
     ],
-    contextual_keywords: &["auto", "default", "existential", "union", "raw", "macro_rules"],
+    contextual_keywords: &["auto", "default", "existential", "union", "raw", "macro_rules", "yeet"],
     literals: &["INT_NUMBER", "FLOAT_NUMBER", "CHAR", "BYTE", "STRING", "BYTE_STRING"],
     tokens: &["ERROR", "IDENT", "WHITESPACE", "LIFETIME_IDENT", "COMMENT", "SHEBANG"],
     nodes: &[
@@ -142,6 +142,7 @@ pub(crate) const KINDS_SRC: KindsSrc<'_> = KindsSrc {
         "STMT_LIST",
         "RETURN_EXPR",
         "YIELD_EXPR",
+        "YEET_EXPR",
         "LET_EXPR",
         "UNDERSCORE_EXPR",
         "MACRO_EXPR",
diff --git a/crates/syntax/src/tests/sourcegen_ast.rs b/crates/syntax/src/tests/sourcegen_ast.rs
index 712ef5f63b..03aa2c451e 100644
--- a/crates/syntax/src/tests/sourcegen_ast.rs
+++ b/crates/syntax/src/tests/sourcegen_ast.rs
@@ -253,7 +253,7 @@ fn generate_nodes(kinds: KindsSrc<'_>, grammar: &AstSrc) -> String {
                             matches!(kind, #(#kinds)|*)
                         }
                         fn cast(syntax: SyntaxNode) -> Option<Self> {
-                            Self::can_cast(syntax.kind()).then(|| #name { syntax })
+                            Self::can_cast(syntax.kind()).then_some(#name { syntax })
                         }
                         fn syntax(&self) -> &SyntaxNode {
                             &self.syntax
@@ -328,7 +328,7 @@ fn generate_nodes(kinds: KindsSrc<'_>, grammar: &AstSrc) -> String {
 
 fn write_doc_comment(contents: &[String], dest: &mut String) {
     for line in contents {
-        writeln!(dest, "///{}", line).unwrap();
+        writeln!(dest, "///{line}").unwrap();
     }
 }
 
@@ -501,7 +501,7 @@ fn to_pascal_case(s: &str) -> String {
 }
 
 fn pluralize(s: &str) -> String {
-    format!("{}s", s)
+    format!("{s}s")
 }
 
 impl Field {
@@ -637,7 +637,7 @@ fn lower_rule(acc: &mut Vec<Field>, grammar: &Grammar, label: Option<&String>, r
             let mut name = grammar[*token].name.clone();
             if name != "int_number" && name != "string" {
                 if "[]{}()".contains(&name) {
-                    name = format!("'{}'", name);
+                    name = format!("'{name}'");
                 }
                 let field = Field::Token(name);
                 acc.push(field);
@@ -651,7 +651,7 @@ fn lower_rule(acc: &mut Vec<Field>, grammar: &Grammar, label: Option<&String>, r
                 acc.push(field);
                 return;
             }
-            panic!("unhandled rule: {:?}", rule)
+            panic!("unhandled rule: {rule:?}")
         }
         Rule::Labeled { label: l, rule } => {
             assert!(label.is_none());
diff --git a/crates/syntax/src/validation.rs b/crates/syntax/src/validation.rs
index 1eea234645..fb2381110b 100644
--- a/crates/syntax/src/validation.rs
+++ b/crates/syntax/src/validation.rs
@@ -196,7 +196,7 @@ pub(crate) fn validate_block_structure(root: &SyntaxNode) {
 
 fn validate_numeric_name(name_ref: Option<ast::NameRef>, errors: &mut Vec<SyntaxError>) {
     if let Some(int_token) = int_token(name_ref) {
-        if int_token.text().chars().any(|c| !c.is_digit(10)) {
+        if int_token.text().chars().any(|c| !c.is_ascii_digit()) {
             errors.push(SyntaxError::new(
                 "Tuple (struct) field access is only allowed through \
                 decimal integers with no underscores or suffix",
diff --git a/crates/test-utils/src/assert_linear.rs b/crates/test-utils/src/assert_linear.rs
index 24502ddb41..15c30c52a5 100644
--- a/crates/test-utils/src/assert_linear.rs
+++ b/crates/test-utils/src/assert_linear.rs
@@ -83,7 +83,7 @@ impl Round {
 
         let a = mean_y - b * mean_x;
 
-        self.plot = format!("y_pred = {:.3} + {:.3} * x\n\nx     y     y_pred\n", a, b);
+        self.plot = format!("y_pred = {a:.3} + {b:.3} * x\n\nx     y     y_pred\n");
 
         let mut se = 0.0;
         let mut max_error = 0.0f64;
@@ -100,7 +100,7 @@ impl Round {
 
         self.linear = rmse < 0.05 && max_error < 0.1 && a > -0.1;
 
-        fn normalize(xs: &mut Vec<f64>) {
+        fn normalize(xs: &mut [f64]) {
             let max = xs.iter().copied().max_by(|a, b| a.partial_cmp(b).unwrap()).unwrap();
             xs.iter_mut().for_each(|it| *it /= max);
         }
diff --git a/crates/test-utils/src/bench_fixture.rs b/crates/test-utils/src/bench_fixture.rs
index 979156263d..9296fd2e68 100644
--- a/crates/test-utils/src/bench_fixture.rs
+++ b/crates/test-utils/src/bench_fixture.rs
@@ -36,10 +36,10 @@ struct S{} {{
 
 pub fn glorious_old_parser() -> String {
     let path = project_root().join("bench_data/glorious_old_parser");
-    fs::read_to_string(&path).unwrap()
+    fs::read_to_string(path).unwrap()
 }
 
 pub fn numerous_macro_rules() -> String {
     let path = project_root().join("bench_data/numerous_macro_rules");
-    fs::read_to_string(&path).unwrap()
+    fs::read_to_string(path).unwrap()
 }
diff --git a/crates/test-utils/src/fixture.rs b/crates/test-utils/src/fixture.rs
index c824f5af72..d1afd0039a 100644
--- a/crates/test-utils/src/fixture.rs
+++ b/crates/test-utils/src/fixture.rs
@@ -78,6 +78,7 @@ pub struct Fixture {
     pub edition: Option<String>,
     pub env: FxHashMap<String, String>,
     pub introduce_new_source_root: Option<String>,
+    pub target_data_layout: Option<String>,
 }
 
 pub struct MiniCore {
@@ -134,11 +135,9 @@ impl Fixture {
             if line.contains("//-") {
                 assert!(
                     line.starts_with("//-"),
-                    "Metadata line {} has invalid indentation. \
+                    "Metadata line {ix} has invalid indentation. \
                      All metadata lines need to have the same indentation.\n\
-                     The offending line: {:?}",
-                    ix,
-                    line
+                     The offending line: {line:?}"
                 );
             }
 
@@ -152,7 +151,7 @@ impl Fixture {
                     && !line.contains('.')
                     && line.chars().all(|it| !it.is_uppercase())
                 {
-                    panic!("looks like invalid metadata line: {:?}", line);
+                    panic!("looks like invalid metadata line: {line:?}");
                 }
 
                 if let Some(entry) = res.last_mut() {
@@ -171,7 +170,7 @@ impl Fixture {
         let components = meta.split_ascii_whitespace().collect::<Vec<_>>();
 
         let path = components[0].to_string();
-        assert!(path.starts_with('/'), "fixture path does not start with `/`: {:?}", path);
+        assert!(path.starts_with('/'), "fixture path does not start with `/`: {path:?}");
 
         let mut krate = None;
         let mut deps = Vec::new();
@@ -181,10 +180,10 @@ impl Fixture {
         let mut cfg_key_values = Vec::new();
         let mut env = FxHashMap::default();
         let mut introduce_new_source_root = None;
+        let mut target_data_layout = None;
         for component in components[1..].iter() {
-            let (key, value) = component
-                .split_once(':')
-                .unwrap_or_else(|| panic!("invalid meta line: {:?}", meta));
+            let (key, value) =
+                component.split_once(':').unwrap_or_else(|| panic!("invalid meta line: {meta:?}"));
             match key {
                 "crate" => krate = Some(value.to_string()),
                 "deps" => deps = value.split(',').map(|it| it.to_string()).collect(),
@@ -213,16 +212,15 @@ impl Fixture {
                     }
                 }
                 "new_source_root" => introduce_new_source_root = Some(value.to_string()),
-                _ => panic!("bad component: {:?}", component),
+                "target_data_layout" => target_data_layout = Some(value.to_string()),
+                _ => panic!("bad component: {component:?}"),
             }
         }
 
         for prelude_dep in extern_prelude.iter().flatten() {
             assert!(
                 deps.contains(prelude_dep),
-                "extern-prelude {:?} must be a subset of deps {:?}",
-                extern_prelude,
-                deps
+                "extern-prelude {extern_prelude:?} must be a subset of deps {deps:?}"
             );
         }
 
@@ -237,6 +235,7 @@ impl Fixture {
             edition,
             env,
             introduce_new_source_root,
+            target_data_layout,
         }
     }
 }
@@ -249,7 +248,7 @@ impl MiniCore {
     #[track_caller]
     fn assert_valid_flag(&self, flag: &str) {
         if !self.valid_flags.iter().any(|it| it == flag) {
-            panic!("invalid flag: {:?}, valid flags: {:?}", flag, self.valid_flags);
+            panic!("invalid flag: {flag:?}, valid flags: {:?}", self.valid_flags);
         }
     }
 
@@ -259,7 +258,7 @@ impl MiniCore {
         let line = line.strip_prefix("//- minicore:").unwrap().trim();
         for entry in line.split(", ") {
             if res.has_flag(entry) {
-                panic!("duplicate minicore flag: {:?}", entry);
+                panic!("duplicate minicore flag: {entry:?}");
             }
             res.activated_flags.push(entry.to_owned());
         }
@@ -345,11 +344,7 @@ impl MiniCore {
 
             let mut keep = true;
             for &region in &active_regions {
-                assert!(
-                    !region.starts_with(' '),
-                    "region marker starts with a space: {:?}",
-                    region
-                );
+                assert!(!region.starts_with(' '), "region marker starts with a space: {region:?}");
                 self.assert_valid_flag(region);
                 seen_regions.push(region);
                 keep &= self.has_flag(region);
@@ -365,7 +360,7 @@ impl MiniCore {
 
         for flag in &self.valid_flags {
             if !seen_regions.iter().any(|it| it == flag) {
-                panic!("unused minicore flag: {:?}", flag);
+                panic!("unused minicore flag: {flag:?}");
             }
         }
         buf
diff --git a/crates/test-utils/src/lib.rs b/crates/test-utils/src/lib.rs
index 8a9cfb6c22..a7a52e08e7 100644
--- a/crates/test-utils/src/lib.rs
+++ b/crates/test-utils/src/lib.rs
@@ -146,8 +146,8 @@ pub fn extract_range_or_offset(text: &str) -> (RangeOrOffset, String) {
 
 /// Extracts ranges, marked with `<tag> </tag>` pairs from the `text`
 pub fn extract_tags(mut text: &str, tag: &str) -> (Vec<(TextRange, Option<String>)>, String) {
-    let open = format!("<{}", tag);
-    let close = format!("</{}>", tag);
+    let open = format!("<{tag}");
+    let close = format!("</{tag}>");
     let mut ranges = Vec::new();
     let mut res = String::new();
     let mut stack = Vec::new();
@@ -169,8 +169,7 @@ pub fn extract_tags(mut text: &str, tag: &str) -> (Vec<(TextRange, Option<String
                     stack.push((from, attr));
                 } else if text.starts_with(&close) {
                     text = &text[close.len()..];
-                    let (from, attr) =
-                        stack.pop().unwrap_or_else(|| panic!("unmatched </{}>", tag));
+                    let (from, attr) = stack.pop().unwrap_or_else(|| panic!("unmatched </{tag}>"));
                     let to = TextSize::of(&res);
                     ranges.push((TextRange::new(from, to), attr));
                 } else {
@@ -180,7 +179,7 @@ pub fn extract_tags(mut text: &str, tag: &str) -> (Vec<(TextRange, Option<String
             }
         }
     }
-    assert!(stack.is_empty(), "unmatched <{}>", tag);
+    assert!(stack.is_empty(), "unmatched <{tag}>");
     ranges.sort_by_key(|r| (r.0.start(), r.0.end()));
     (ranges, res)
 }
@@ -397,7 +396,7 @@ pub fn skip_slow_tests() -> bool {
         eprintln!("ignoring slow test");
     } else {
         let path = project_root().join("./target/.slow_tests_cookie");
-        fs::write(&path, ".").unwrap();
+        fs::write(path, ".").unwrap();
     }
     should_skip
 }
@@ -413,8 +412,8 @@ pub fn format_diff(chunks: Vec<dissimilar::Chunk<'_>>) -> String {
     for chunk in chunks {
         let formatted = match chunk {
             dissimilar::Chunk::Equal(text) => text.into(),
-            dissimilar::Chunk::Delete(text) => format!("\x1b[41m{}\x1b[0m", text),
-            dissimilar::Chunk::Insert(text) => format!("\x1b[42m{}\x1b[0m", text),
+            dissimilar::Chunk::Delete(text) => format!("\x1b[41m{text}\x1b[0m"),
+            dissimilar::Chunk::Insert(text) => format!("\x1b[42m{text}\x1b[0m"),
         };
         buf.push_str(&formatted);
     }
@@ -480,7 +479,7 @@ pub fn try_ensure_file_contents(file: &Path, contents: &str) -> Result<(), ()> {
         }
         _ => (),
     }
-    let display_path = file.strip_prefix(&project_root()).unwrap_or(file);
+    let display_path = file.strip_prefix(project_root()).unwrap_or(file);
     eprintln!(
         "\n\x1b[31;1merror\x1b[0m: {} was not up-to-date, updating\n",
         display_path.display()
diff --git a/crates/test-utils/src/minicore.rs b/crates/test-utils/src/minicore.rs
index 69d2e62b25..3ca63fcab9 100644
--- a/crates/test-utils/src/minicore.rs
+++ b/crates/test-utils/src/minicore.rs
@@ -20,6 +20,7 @@
 //!     derive:
 //!     drop:
 //!     eq: sized
+//!     error: fmt
 //!     fmt: result
 //!     fn:
 //!     from: sized
@@ -29,13 +30,16 @@
 //!     index: sized
 //!     iterator: option
 //!     iterators: iterator, fn
+//!     non_zero:
 //!     option:
 //!     ord: eq, option
 //!     pin:
 //!     range:
 //!     result:
+//!     send: sized
 //!     sized:
 //!     slice:
+//!     sync: sized
 //!     try:
 //!     unsize: sized
 
@@ -47,6 +51,24 @@ pub mod marker {
     pub trait Sized {}
     // endregion:sized
 
+    // region:send
+    pub unsafe auto trait Send {}
+
+    impl<T: ?Sized> !Send for *const T {}
+    impl<T: ?Sized> !Send for *mut T {}
+    // region:sync
+    unsafe impl<T: Sync + ?Sized> Send for &T {}
+    unsafe impl<T: Send + ?Sized> Send for &mut T {}
+    // endregion:sync
+    // endregion:send
+
+    // region:sync
+    pub unsafe auto trait Sync {}
+
+    impl<T: ?Sized> !Sync for *const T {}
+    impl<T: ?Sized> !Sync for *mut T {}
+    // endregion:sync
+
     // region:unsize
     #[lang = "unsize"]
     pub trait Unsize<T: ?Sized> {}
@@ -91,7 +113,7 @@ pub mod default {
         fn default() -> Self;
     }
     // region:derive
-    #[rustc_builtin_macro]
+    #[rustc_builtin_macro(Default, attributes(default))]
     pub macro Default($item:item) {}
     // endregion:derive
 }
@@ -360,6 +382,12 @@ pub mod ops {
         type Output;
         fn add(self, rhs: Rhs) -> Self::Output;
     }
+
+    #[lang = "add_assign"]
+    #[const_trait]
+    pub trait AddAssign<Rhs = Self> {
+        fn add_assign(&mut self, rhs: Rhs);
+    }
     // endregion:add
 
     // region:generator
@@ -438,6 +466,9 @@ pub mod fmt {
     pub trait Debug {
         fn fmt(&self, f: &mut Formatter<'_>) -> Result;
     }
+    pub trait Display {
+        fn fmt(&self, f: &mut Formatter<'_>) -> Result;
+    }
 }
 // endregion:fmt
 
@@ -680,6 +711,15 @@ mod macros {
 }
 // endregion:derive
 
+// region:non_zero
+pub mod num {
+    #[repr(transparent)]
+    #[rustc_layout_scalar_valid_range_start(1)]
+    #[rustc_nonnull_optimization_guaranteed]
+    pub struct NonZeroU8(u8);
+}
+// endregion:non_zero
+
 // region:bool_impl
 #[lang = "bool"]
 impl bool {
@@ -693,6 +733,17 @@ impl bool {
 }
 // endregion:bool_impl
 
+// region:error
+pub mod error {
+    #[rustc_has_incoherent_inherent_impls]
+    pub trait Error: crate::fmt::Debug + crate::fmt::Display {
+        fn source(&self) -> Option<&(dyn Error + 'static)> {
+            None
+        }
+    }
+}
+// endregion:error
+
 pub mod prelude {
     pub mod v1 {
         pub use crate::{
@@ -705,7 +756,9 @@ pub mod prelude {
             iter::{IntoIterator, Iterator},     // :iterator
             macros::builtin::derive,            // :derive
             marker::Copy,                       // :copy
+            marker::Send,                       // :send
             marker::Sized,                      // :sized
+            marker::Sync,                       // :sync
             mem::drop,                          // :drop
             ops::Drop,                          // :drop
             ops::{Fn, FnMut, FnOnce},           // :fn
diff --git a/crates/toolchain/src/lib.rs b/crates/toolchain/src/lib.rs
index b05da76916..67bdad2aad 100644
--- a/crates/toolchain/src/lib.rs
+++ b/crates/toolchain/src/lib.rs
@@ -35,7 +35,7 @@ fn get_path_for_executable(executable_name: &'static str) -> PathBuf {
     //      example: for cargo, this tries ~/.cargo/bin/cargo
     //      It seems that this is a reasonable place to try for cargo, rustc, and rustup
     let env_var = executable_name.to_ascii_uppercase();
-    if let Some(path) = env::var_os(&env_var) {
+    if let Some(path) = env::var_os(env_var) {
         return path.into();
     }
 
diff --git a/crates/tt/src/buffer.rs b/crates/tt/src/buffer.rs
index 69226bd4c4..d27a7aa0d4 100644
--- a/crates/tt/src/buffer.rs
+++ b/crates/tt/src/buffer.rs
@@ -190,7 +190,7 @@ impl<'a> Cursor<'a> {
     pub fn token_tree(self) -> Option<TokenTreeRef<'a>> {
         match self.entry() {
             Some(Entry::Leaf(tt)) => match tt {
-                TokenTree::Leaf(leaf) => Some(TokenTreeRef::Leaf(leaf, *tt)),
+                TokenTree::Leaf(leaf) => Some(TokenTreeRef::Leaf(leaf, tt)),
                 TokenTree::Subtree(subtree) => Some(TokenTreeRef::Subtree(subtree, Some(tt))),
             },
             Some(Entry::Subtree(tt, subtree, _)) => Some(TokenTreeRef::Subtree(subtree, *tt)),
diff --git a/crates/tt/src/lib.rs b/crates/tt/src/lib.rs
index a54861de95..353b09fd8c 100644
--- a/crates/tt/src/lib.rs
+++ b/crates/tt/src/lib.rs
@@ -86,10 +86,20 @@ pub enum Spacing {
 
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub struct Ident {
+    /// Identifier or keyword. Unlike rustc, we keep "r#" prefix when it represents a raw identifier.
     pub text: SmolStr,
     pub id: TokenId,
 }
 
+impl Ident {
+    /// Constructor intended to be used only by proc macro server. `text` should not contain raw
+    /// identifier prefix.
+    pub fn new_with_is_raw(text: SmolStr, id: TokenId, is_raw: bool) -> Self {
+        let text = if is_raw { SmolStr::from_iter(["r#", &text]) } else { text };
+        Ident { text, id }
+    }
+}
+
 impl Leaf {
     pub fn id(&self) -> TokenId {
         match self {
@@ -105,15 +115,15 @@ fn print_debug_subtree(f: &mut fmt::Formatter<'_>, subtree: &Subtree, level: usi
 
     let aux = match subtree.delimiter.map(|it| (it.kind, it.id.0)) {
         None => "$".to_string(),
-        Some((DelimiterKind::Parenthesis, id)) => format!("() {}", id),
-        Some((DelimiterKind::Brace, id)) => format!("{{}} {}", id),
-        Some((DelimiterKind::Bracket, id)) => format!("[] {}", id),
+        Some((DelimiterKind::Parenthesis, id)) => format!("() {id}"),
+        Some((DelimiterKind::Brace, id)) => format!("{{}} {id}"),
+        Some((DelimiterKind::Bracket, id)) => format!("[] {id}"),
     };
 
     if subtree.token_trees.is_empty() {
-        write!(f, "{}SUBTREE {}", align, aux)?;
+        write!(f, "{align}SUBTREE {aux}")?;
     } else {
-        writeln!(f, "{}SUBTREE {}", align, aux)?;
+        writeln!(f, "{align}SUBTREE {aux}")?;
         for (idx, child) in subtree.token_trees.iter().enumerate() {
             print_debug_token(f, child, level + 1)?;
             if idx != subtree.token_trees.len() - 1 {
@@ -130,7 +140,7 @@ fn print_debug_token(f: &mut fmt::Formatter<'_>, tkn: &TokenTree, level: usize)
 
     match tkn {
         TokenTree::Leaf(leaf) => match leaf {
-            Leaf::Literal(lit) => write!(f, "{}LITERAL {} {}", align, lit.text, lit.id.0)?,
+            Leaf::Literal(lit) => write!(f, "{align}LITERAL {} {}", lit.text, lit.id.0)?,
             Leaf::Punct(punct) => write!(
                 f,
                 "{}PUNCH   {} [{}] {}",
@@ -139,7 +149,7 @@ fn print_debug_token(f: &mut fmt::Formatter<'_>, tkn: &TokenTree, level: usize)
                 if punct.spacing == Spacing::Alone { "alone" } else { "joint" },
                 punct.id.0
             )?,
-            Leaf::Ident(ident) => write!(f, "{}IDENT   {} {}", align, ident.text, ident.id.0)?,
+            Leaf::Ident(ident) => write!(f, "{align}IDENT   {} {}", ident.text, ident.id.0)?,
         },
         TokenTree::Subtree(subtree) => {
             print_debug_subtree(f, subtree, level)?;
@@ -302,7 +312,7 @@ pub fn pretty(tkns: &[TokenTree]) -> String {
                     Some(DelimiterKind::Parenthesis) => ("(", ")"),
                     Some(DelimiterKind::Bracket) => ("[", "]"),
                 };
-                format!("{}{}{}", open, content, close)
+                format!("{open}{content}{close}")
             }
         }
     }
diff --git a/crates/vfs/src/file_set.rs b/crates/vfs/src/file_set.rs
index e0ef737b3f..700aebe0b3 100644
--- a/crates/vfs/src/file_set.rs
+++ b/crates/vfs/src/file_set.rs
@@ -140,16 +140,11 @@ impl FileSetConfig {
 }
 
 /// Builder for [`FileSetConfig`].
+#[derive(Default)]
 pub struct FileSetConfigBuilder {
     roots: Vec<Vec<VfsPath>>,
 }
 
-impl Default for FileSetConfigBuilder {
-    fn default() -> Self {
-        FileSetConfigBuilder { roots: Vec::new() }
-    }
-}
-
 impl FileSetConfigBuilder {
     /// Returns the number of sets currently held.
     pub fn len(&self) -> usize {
diff --git a/crates/vfs/src/lib.rs b/crates/vfs/src/lib.rs
index afc9a0fa6f..c61f30387b 100644
--- a/crates/vfs/src/lib.rs
+++ b/crates/vfs/src/lib.rs
@@ -59,15 +59,10 @@ pub use paths::{AbsPath, AbsPathBuf};
 /// Handle to a file in [`Vfs`]
 ///
 /// Most functions in rust-analyzer use this when they need to refer to a file.
-#[derive(Copy, Clone, Debug, Ord, PartialOrd, Eq, PartialEq)]
+#[derive(Copy, Clone, Debug, Ord, PartialOrd, Eq, PartialEq, Hash)]
 pub struct FileId(pub u32);
 
 impl stdx::hash::NoHashHashable for FileId {}
-impl std::hash::Hash for FileId {
-    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
-        self.0.hash(state);
-    }
-}
 
 /// Storage for all files read by rust-analyzer.
 ///
diff --git a/crates/vfs/src/path_interner.rs b/crates/vfs/src/path_interner.rs
index 6e049f0d40..64f5197605 100644
--- a/crates/vfs/src/path_interner.rs
+++ b/crates/vfs/src/path_interner.rs
@@ -9,16 +9,11 @@ use rustc_hash::FxHasher;
 use crate::{FileId, VfsPath};
 
 /// Structure to map between [`VfsPath`] and [`FileId`].
+#[derive(Default)]
 pub(crate) struct PathInterner {
     map: IndexSet<VfsPath, BuildHasherDefault<FxHasher>>,
 }
 
-impl Default for PathInterner {
-    fn default() -> Self {
-        Self { map: IndexSet::default() }
-    }
-}
-
 impl PathInterner {
     /// Get the id corresponding to `path`.
     ///
diff --git a/crates/vfs/src/vfs_path.rs b/crates/vfs/src/vfs_path.rs
index 668c7320d4..b23c9f1966 100644
--- a/crates/vfs/src/vfs_path.rs
+++ b/crates/vfs/src/vfs_path.rs
@@ -364,7 +364,7 @@ impl VirtualPath {
             path = &path["../".len()..];
         }
         path = path.trim_start_matches("./");
-        res.0 = format!("{}/{}", res.0, path);
+        res.0 = format!("{}/{path}", res.0);
         Some(res)
     }
 
diff --git a/docs/dev/README.md b/docs/dev/README.md
index 4ac75b4bbf..cdab6b0992 100644
--- a/docs/dev/README.md
+++ b/docs/dev/README.md
@@ -200,7 +200,7 @@ Look for `fn benchmark_xxx` tests for a quick way to reproduce performance probl
 
 ## Release Process
 
-Release process is handled by `release`, `dist` and `promote` xtasks, `release` being the main one.
+Release process is handled by `release`, `dist`, `publish-release-notes` and `promote` xtasks, `release` being the main one.
 
 `release` assumes that you have checkouts of `rust-analyzer`, `rust-analyzer.github.io`, and `rust-lang/rust` in the same directory:
 
@@ -231,8 +231,9 @@ Release steps:
    * create a new changelog in `rust-analyzer.github.io`
 3. While the release is in progress, fill in the changelog
 4. Commit & push the changelog
-5. Tweet
-6. Inside `rust-analyzer`, run `cargo xtask promote` -- this will create a PR to rust-lang/rust updating rust-analyzer's subtree.
+5. Run `cargo xtask publish-release-notes <CHANGELOG>` -- this will convert the changelog entry in AsciiDoc to Markdown and update the body of GitHub Releases entry.
+6. Tweet
+7. Inside `rust-analyzer`, run `cargo xtask promote` -- this will create a PR to rust-lang/rust updating rust-analyzer's subtree.
    Self-approve the PR.
 
 If the GitHub Actions release fails because of a transient problem like a timeout, you can re-run the job from the Actions console.
diff --git a/docs/dev/lsp-extensions.md b/docs/dev/lsp-extensions.md
index fe316fcae9..a4780af1a2 100644
--- a/docs/dev/lsp-extensions.md
+++ b/docs/dev/lsp-extensions.md
@@ -1,5 +1,5 @@
 <!---
-lsp_ext.rs hash: 62068e53ac202dc8
+lsp_ext.rs hash: 45bd7985265725c5
 
 If you need to change the above hash to make the test pass, please check if you
 need to adjust this doc as well and ping this issue:
@@ -459,6 +459,45 @@ Note that this functionality is intended primarily to inform the end user about
 In particular, it's valid for the client to completely ignore this extension.
 Clients are discouraged from but are allowed to use the `health` status to decide if it's worth sending a request to the server.
 
+### Controlling Flycheck
+
+The flycheck/checkOnSave feature can be controlled via notifications sent by the client to the server.
+
+**Method:** `rust-analyzer/runFlycheck`
+
+**Notification:**
+
+```typescript
+interface RunFlycheckParams {
+    /// The text document whose cargo workspace flycheck process should be started.
+    /// If the document is null or does not belong to a cargo workspace all flycheck processes will be started.
+    textDocument: lc.TextDocumentIdentifier | null;
+}
+```
+
+Triggers the flycheck processes.
+
+
+**Method:** `rust-analyzer/clearFlycheck`
+
+**Notification:**
+
+```typescript
+interface ClearFlycheckParams {}
+```
+
+Clears the flycheck diagnostics.
+
+**Method:** `rust-analyzer/cancelFlycheck`
+
+**Notification:**
+
+```typescript
+interface CancelFlycheckParams {}
+```
+
+Cancels all running flycheck processes.
+
 ## Syntax Tree
 
 **Method:** `rust-analyzer/syntaxTree`
@@ -753,3 +792,29 @@ export interface ClientCommandOptions {
     commands: string[];
 }
 ```
+
+## Colored Diagnostic Output
+
+**Experimental Client Capability:** `{ "colorDiagnosticOutput": boolean }`
+
+If this capability is set, the "full compiler diagnostics" provided by `checkOnSave`
+will include ANSI color and style codes to render the diagnostic in a similar manner
+as `cargo`. This is translated into `--message-format=json-diagnostic-rendered-ansi`
+when flycheck is run, instead of the default `--message-format=json`.
+
+The full compiler rendered diagnostics are included in the server response
+regardless of this capability:
+
+```typescript
+// https://microsoft.github.io/language-server-protocol/specifications/specification-current#diagnostic
+export interface Diagnostic {
+    ...
+    data?: {
+        /**
+         * The human-readable compiler output as it would be printed to a terminal.
+         * Includes ANSI color and style codes if the client has set the experimental
+         * `colorDiagnosticOutput` capability.
+         */
+        rendered?: string;
+    };
+}
diff --git a/docs/dev/style.md b/docs/dev/style.md
index a80eebd632..d2a03fba40 100644
--- a/docs/dev/style.md
+++ b/docs/dev/style.md
@@ -101,7 +101,7 @@ Including a description and GIF suitable for the changelog means less work for t
 
 We don't enforce Clippy.
 A number of default lints have high false positive rate.
-Selectively patching false-positives with `allow(clippy)` is considered worse than not using Clippy at all.
+Selectively patching false-positives with `allow(clippy)` is probably worse than entirely disabling a problematic lint.
 There's a `cargo lint` command which runs a subset of low-FPR lints.
 Careful tweaking of `lint` is welcome.
 Of course, applying Clippy suggestions is welcome as long as they indeed improve the code.
diff --git a/docs/user/generated_config.adoc b/docs/user/generated_config.adoc
index 57f950034c..b33a2e7952 100644
--- a/docs/user/generated_config.adoc
+++ b/docs/user/generated_config.adoc
@@ -109,33 +109,33 @@ Compilation target override (target triple).
 --
 Unsets `#[cfg(test)]` for the specified crates.
 --
-[[rust-analyzer.checkOnSave.allTargets]]rust-analyzer.checkOnSave.allTargets (default: `true`)::
+[[rust-analyzer.checkOnSave]]rust-analyzer.checkOnSave (default: `true`)::
++
+--
+Run the check command for diagnostics on save.
+--
+[[rust-analyzer.check.allTargets]]rust-analyzer.check.allTargets (default: `true`)::
 +
 --
 Check all targets and tests (`--all-targets`).
 --
-[[rust-analyzer.checkOnSave.command]]rust-analyzer.checkOnSave.command (default: `"check"`)::
+[[rust-analyzer.check.command]]rust-analyzer.check.command (default: `"check"`)::
 +
 --
 Cargo command to use for `cargo check`.
 --
-[[rust-analyzer.checkOnSave.enable]]rust-analyzer.checkOnSave.enable (default: `true`)::
-+
---
-Run specified `cargo check` command for diagnostics on save.
---
-[[rust-analyzer.checkOnSave.extraArgs]]rust-analyzer.checkOnSave.extraArgs (default: `[]`)::
+[[rust-analyzer.check.extraArgs]]rust-analyzer.check.extraArgs (default: `[]`)::
 +
 --
 Extra arguments for `cargo check`.
 --
-[[rust-analyzer.checkOnSave.extraEnv]]rust-analyzer.checkOnSave.extraEnv (default: `{}`)::
+[[rust-analyzer.check.extraEnv]]rust-analyzer.check.extraEnv (default: `{}`)::
 +
 --
 Extra environment variables that will be set when running `cargo check`.
 Extends `#rust-analyzer.cargo.extraEnv#`.
 --
-[[rust-analyzer.checkOnSave.features]]rust-analyzer.checkOnSave.features (default: `null`)::
+[[rust-analyzer.check.features]]rust-analyzer.check.features (default: `null`)::
 +
 --
 List of features to activate. Defaults to
@@ -143,7 +143,7 @@ List of features to activate. Defaults to
 
 Set to `"all"` to pass `--all-features` to Cargo.
 --
-[[rust-analyzer.checkOnSave.invocationLocation]]rust-analyzer.checkOnSave.invocationLocation (default: `"workspace"`)::
+[[rust-analyzer.check.invocationLocation]]rust-analyzer.check.invocationLocation (default: `"workspace"`)::
 +
 --
 Specifies the working directory for running checks.
@@ -153,7 +153,7 @@ Specifies the working directory for running checks.
 This config only has an effect when `#rust-analyzer.cargo.buildScripts.overrideCommand#`
 is set.
 --
-[[rust-analyzer.checkOnSave.invocationStrategy]]rust-analyzer.checkOnSave.invocationStrategy (default: `"per_workspace"`)::
+[[rust-analyzer.check.invocationStrategy]]rust-analyzer.check.invocationStrategy (default: `"per_workspace"`)::
 +
 --
 Specifies the invocation strategy to use when running the checkOnSave command.
@@ -162,18 +162,20 @@ If `once` is set, the command will be executed once.
 This config only has an effect when `#rust-analyzer.cargo.buildScripts.overrideCommand#`
 is set.
 --
-[[rust-analyzer.checkOnSave.noDefaultFeatures]]rust-analyzer.checkOnSave.noDefaultFeatures (default: `null`)::
+[[rust-analyzer.check.noDefaultFeatures]]rust-analyzer.check.noDefaultFeatures (default: `null`)::
 +
 --
 Whether to pass `--no-default-features` to Cargo. Defaults to
 `#rust-analyzer.cargo.noDefaultFeatures#`.
 --
-[[rust-analyzer.checkOnSave.overrideCommand]]rust-analyzer.checkOnSave.overrideCommand (default: `null`)::
+[[rust-analyzer.check.overrideCommand]]rust-analyzer.check.overrideCommand (default: `null`)::
 +
 --
 Override the command rust-analyzer uses instead of `cargo check` for
 diagnostics on save. The command is required to output json and
-should therefore include `--message-format=json` or a similar option.
+should therefore include `--message-format=json` or a similar option
+(if your client supports the `colorDiagnosticOutput` experimental
+capability, you can use `--message-format=json-diagnostic-rendered-ansi`).
 
 If you're changing this because you're using some tool wrapping
 Cargo, you might also want to change
@@ -190,7 +192,7 @@ cargo check --workspace --message-format=json --all-targets
 ```
 .
 --
-[[rust-analyzer.checkOnSave.target]]rust-analyzer.checkOnSave.target (default: `[]`)::
+[[rust-analyzer.check.targets]]rust-analyzer.check.targets (default: `null`)::
 +
 --
 Check for specific targets. Defaults to `#rust-analyzer.cargo.target#` if empty.
@@ -454,11 +456,26 @@ to always show them).
 --
 Whether to show inlay type hints for return types of closures.
 --
+[[rust-analyzer.inlayHints.discriminantHints.enable]]rust-analyzer.inlayHints.discriminantHints.enable (default: `"never"`)::
++
+--
+Whether to show enum variant discriminant hints.
+--
 [[rust-analyzer.inlayHints.expressionAdjustmentHints.enable]]rust-analyzer.inlayHints.expressionAdjustmentHints.enable (default: `"never"`)::
 +
 --
 Whether to show inlay hints for type adjustments.
 --
+[[rust-analyzer.inlayHints.expressionAdjustmentHints.hideOutsideUnsafe]]rust-analyzer.inlayHints.expressionAdjustmentHints.hideOutsideUnsafe (default: `false`)::
++
+--
+Whether to hide inlay hints for type adjustments outside of `unsafe` blocks.
+--
+[[rust-analyzer.inlayHints.expressionAdjustmentHints.mode]]rust-analyzer.inlayHints.expressionAdjustmentHints.mode (default: `"prefix"`)::
++
+--
+Whether to show inlay hints as postfix ops (`.*` instead of `*`, etc).
+--
 [[rust-analyzer.inlayHints.lifetimeElisionHints.enable]]rust-analyzer.inlayHints.lifetimeElisionHints.enable (default: `"never"`)::
 +
 --
@@ -469,6 +486,11 @@ Whether to show inlay type hints for elided lifetimes in function signatures.
 --
 Whether to prefer using parameter names as the name for elided lifetime hints if possible.
 --
+[[rust-analyzer.inlayHints.locationLinks]]rust-analyzer.inlayHints.locationLinks (default: `true`)::
++
+--
+Whether to use location links for parts of type mentioned in inlay hints.
+--
 [[rust-analyzer.inlayHints.maxLength]]rust-analyzer.inlayHints.maxLength (default: `25`)::
 +
 --
@@ -604,6 +626,11 @@ Number of syntax trees rust-analyzer keeps in memory. Defaults to 128.
 --
 Whether to show `can't find Cargo.toml` error message.
 --
+[[rust-analyzer.numThreads]]rust-analyzer.numThreads (default: `null`)::
++
+--
+How many worker threads in the main loop. The default `null` means to pick automatically.
+--
 [[rust-analyzer.procMacro.attributes.enable]]rust-analyzer.procMacro.attributes.enable (default: `true`)::
 +
 --
diff --git a/editors/code/package-lock.json b/editors/code/package-lock.json
index 0b25564e28..4844837a06 100644
--- a/editors/code/package-lock.json
+++ b/editors/code/package-lock.json
@@ -9,8 +9,9 @@
             "version": "0.5.0-dev",
             "license": "MIT OR Apache-2.0",
             "dependencies": {
+                "anser": "^2.1.1",
                 "d3": "^7.6.1",
-                "d3-graphviz": "^4.1.1",
+                "d3-graphviz": "^5.0.2",
                 "vscode-languageclient": "^8.0.2"
             },
             "devDependencies": {
@@ -54,14 +55,14 @@
             }
         },
         "node_modules/@hpcc-js/wasm": {
-            "version": "1.12.8",
-            "resolved": "https://registry.npmjs.org/@hpcc-js/wasm/-/wasm-1.12.8.tgz",
-            "integrity": "sha512-n4q9ARKco2hpCLsuVaW6Az3cDVaua7B3DSONHkc49WtEzgY/btvcDG5Zr1P6PZDv0sQ7oPnAi9Y+W2DI++MgcQ==",
+            "version": "2.5.0",
+            "resolved": "https://registry.npmjs.org/@hpcc-js/wasm/-/wasm-2.5.0.tgz",
+            "integrity": "sha512-G26BamgaHW46f6P8bmkygapgNcy+tTDMwIvCzmMzdp39sxUS1u4gaT/vR2SSDc4x3SfL5RE4B2B8ef/wd429Hg==",
             "dependencies": {
-                "yargs": "^17.3.1"
+                "yargs": "17.6.2"
             },
             "bin": {
-                "dot-wasm": "bin/cli.js"
+                "dot-wasm": "bin/dot-wasm.js"
             }
         },
         "node_modules/@humanwhocodes/config-array": {
@@ -394,6 +395,11 @@
                 "url": "https://github.com/sponsors/epoberezkin"
             }
         },
+        "node_modules/anser": {
+            "version": "2.1.1",
+            "resolved": "https://registry.npmjs.org/anser/-/anser-2.1.1.tgz",
+            "integrity": "sha512-nqLm4HxOTpeLOxcmB3QWmV5TcDFhW9y/fyQ+hivtDFcK4OQ+pQ5fzPnXHM1Mfcm0VkLtvVi1TCPr++Qy0Q/3EQ=="
+        },
         "node_modules/ansi-regex": {
             "version": "5.0.1",
             "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
@@ -698,13 +704,16 @@
             "dev": true
         },
         "node_modules/cliui": {
-            "version": "7.0.4",
-            "resolved": "https://registry.npmjs.org/cliui/-/cliui-7.0.4.tgz",
-            "integrity": "sha512-OcRE68cOsVMXp1Yvonl/fzkQOyjLSu/8bhPDfQt0e0/Eb283TKP20Fs2MqoPsr9SwA595rRCA+QMzYc9nBP+JQ==",
+            "version": "8.0.1",
+            "resolved": "https://registry.npmjs.org/cliui/-/cliui-8.0.1.tgz",
+            "integrity": "sha512-BSeNnyus75C4//NQ9gQt1/csTXyo/8Sb+afLAkzAptFuMsod9HFokGNudZpi/oQV73hnVK+sR+5PVRMd+Dr7YQ==",
             "dependencies": {
                 "string-width": "^4.2.0",
-                "strip-ansi": "^6.0.0",
+                "strip-ansi": "^6.0.1",
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-                    "resolved": "https://registry.npmjs.org/d3-timer/-/d3-timer-2.0.0.tgz",
-                    "integrity": "sha512-TO4VLh0/420Y/9dO3+f9abDEFYeCUr2WZRlxJvbp4HPTQcSylXNiL6yZa9FIUvV1yRiFufl1bszTCLDqv9PWNA=="
-                },
-                "d3-transition": {
-                    "version": "2.0.0",
-                    "resolved": "https://registry.npmjs.org/d3-transition/-/d3-transition-2.0.0.tgz",
-                    "integrity": "sha512-42ltAGgJesfQE3u9LuuBHNbGrI/AJjNL2OAUdclE70UE6Vy239GCBEYD38uBPoLeNsOhFStGpPI0BAOV+HMxog==",
-                    "requires": {
-                        "d3-color": "1 - 2",
-                        "d3-dispatch": "1 - 2",
-                        "d3-ease": "1 - 2",
-                        "d3-interpolate": "1 - 2",
-                        "d3-timer": "1 - 2"
-                    }
-                },
-                "d3-zoom": {
-                    "version": "2.0.0",
-                    "resolved": "https://registry.npmjs.org/d3-zoom/-/d3-zoom-2.0.0.tgz",
-                    "integrity": "sha512-fFg7aoaEm9/jf+qfstak0IYpnesZLiMX6GZvXtUSdv8RH2o4E2qeelgdU09eKS6wGuiGMfcnMI0nTIqWzRHGpw==",
-                    "requires": {
-                        "d3-dispatch": "1 - 2",
-                        "d3-drag": "2",
-                        "d3-interpolate": "1 - 2",
-                        "d3-selection": "2",
-                        "d3-transition": "2"
-                    }
-                }
+                "@hpcc-js/wasm": "2.5.0",
+                "d3-dispatch": "^3.0.1",
+                "d3-format": "^3.1.0",
+                "d3-interpolate": "^3.0.1",
+                "d3-path": "^3.1.0",
+                "d3-timer": "^3.0.1",
+                "d3-transition": "^3.0.1",
+                "d3-zoom": "^3.0.0"
             }
         },
         "d3-hierarchy": {
@@ -4757,9 +4585,9 @@
             }
         },
         "d3-path": {
-            "version": "3.0.1",
-            "resolved": "https://registry.npmjs.org/d3-path/-/d3-path-3.0.1.tgz",
-            "integrity": "sha512-gq6gZom9AFZby0YLduxT1qmrp4xpBA1YZr19OI717WIdKE2OM5ETq5qrHLb301IgxhLwcuxvGZVLeeWc/k1I6w=="
+            "version": "3.1.0",
+            "resolved": "https://registry.npmjs.org/d3-path/-/d3-path-3.1.0.tgz",
+            "integrity": "sha512-p3KP5HCf/bvjBSSKuXid6Zqijx7wIfNW+J/maPs+iwR35at5JCbLUT0LzF1cnjbCHWhqzQTIN2Jpe8pRebIEFQ=="
         },
         "d3-polygon": {
             "version": "3.0.1",
@@ -4798,9 +4626,9 @@
             }
         },
         "d3-selection": {
-            "version": "2.0.0",
-            "resolved": "https://registry.npmjs.org/d3-selection/-/d3-selection-2.0.0.tgz",
-            "integrity": "sha512-XoGGqhLUN/W14NmaqcO/bb1nqjDAw5WtSYb2X8wiuQWvSZUsUVYsOSkOybUrNvcBjaywBdYPy03eXHMXjk9nZA=="
+            "version": "3.0.0",
+            "resolved": "https://registry.npmjs.org/d3-selection/-/d3-selection-3.0.0.tgz",
+            "integrity": "sha512-fmTRWbNMmsmWq6xJV8D19U/gw/bwrHfNXxrIN+HfZgnzqTHp9jOmKMhsTUjXOJnZOdZY9Q28y4yebKzqDKlxlQ=="
         },
         "d3-shape": {
             "version": "3.1.0",
@@ -6720,23 +6548,23 @@
             "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A=="
         },
         "yargs": {
-            "version": "17.5.1",
-            "resolved": "https://registry.npmjs.org/yargs/-/yargs-17.5.1.tgz",
-            "integrity": "sha512-t6YAJcxDkNX7NFYiVtKvWUz8l+PaKTLiL63mJYWR2GnHq2gjEWISzsLp9wg3aY36dY1j+gfIEL3pIF+XlJJfbA==",
+            "version": "17.6.2",
+            "resolved": "https://registry.npmjs.org/yargs/-/yargs-17.6.2.tgz",
+            "integrity": "sha512-1/9UrdHjDZc0eOU0HxOHoS78C69UD3JRMvzlJ7S79S2nTaWRA/whGCTV8o9e/N/1Va9YIV7Q4sOxD8VV4pCWOw==",
             "requires": {
-                "cliui": "^7.0.2",
+                "cliui": "^8.0.1",
                 "escalade": "^3.1.1",
                 "get-caller-file": "^2.0.5",
                 "require-directory": "^2.1.1",
                 "string-width": "^4.2.3",
                 "y18n": "^5.0.5",
-                "yargs-parser": "^21.0.0"
+                "yargs-parser": "^21.1.1"
             }
         },
         "yargs-parser": {
-            "version": "21.0.1",
-            "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-21.0.1.tgz",
-            "integrity": "sha512-9BK1jFpLzJROCI5TzwZL/TU4gqjK5xiHV/RfWLOahrjAko/e4DJkRDZQXfvqAsiZzzYhgAzbgz6lg48jcm4GLg=="
+            "version": "21.1.1",
+            "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-21.1.1.tgz",
+            "integrity": "sha512-tVpsJW7DdjecAiFpbIB1e3qxIQsE6NoPc5/eTdrbbIC4h0LVsWhnoa3g+m2HclBIujHzsxZ4VJVA+GUuc2/LBw=="
         },
         "yauzl": {
             "version": "2.10.0",
diff --git a/editors/code/package.json b/editors/code/package.json
index c4d4e428ea..930564bd7c 100644
--- a/editors/code/package.json
+++ b/editors/code/package.json
@@ -35,8 +35,9 @@
         "test": "cross-env TEST_VARIABLE=test node ./out/tests/runTests.js"
     },
     "dependencies": {
+        "anser": "^2.1.1",
         "d3": "^7.6.1",
-        "d3-graphviz": "^4.1.1",
+        "d3-graphviz": "^5.0.2",
         "vscode-languageclient": "^8.0.2"
     },
     "devDependencies": {
@@ -246,6 +247,16 @@
                 "command": "rust-analyzer.cancelFlycheck",
                 "title": "Cancel running flychecks",
                 "category": "rust-analyzer"
+            },
+            {
+                "command": "rust-analyzer.runFlycheck",
+                "title": "Run flycheck",
+                "category": "rust-analyzer"
+            },
+            {
+                "command": "rust-analyzer.clearFlycheck",
+                "title": "Clear flycheck diagnostics",
+                "category": "rust-analyzer"
             }
         ],
         "keybindings": [
@@ -401,6 +412,11 @@
                     "default": false,
                     "type": "boolean"
                 },
+                "rust-analyzer.diagnostics.useRustcErrorCode": {
+                    "markdownDescription": "Whether to use the rustc error code.",
+                    "default": false,
+                    "type": "boolean"
+                },
                 "$generated-start": {},
                 "rust-analyzer.assist.emitMustUse": {
                     "markdownDescription": "Whether to insert #[must_use] when generating `as_` methods\nfor enum variants.",
@@ -541,22 +557,22 @@
                         "type": "string"
                     }
                 },
-                "rust-analyzer.checkOnSave.allTargets": {
+                "rust-analyzer.checkOnSave": {
+                    "markdownDescription": "Run the check command for diagnostics on save.",
+                    "default": true,
+                    "type": "boolean"
+                },
+                "rust-analyzer.check.allTargets": {
                     "markdownDescription": "Check all targets and tests (`--all-targets`).",
                     "default": true,
                     "type": "boolean"
                 },
-                "rust-analyzer.checkOnSave.command": {
+                "rust-analyzer.check.command": {
                     "markdownDescription": "Cargo command to use for `cargo check`.",
                     "default": "check",
                     "type": "string"
                 },
-                "rust-analyzer.checkOnSave.enable": {
-                    "markdownDescription": "Run specified `cargo check` command for diagnostics on save.",
-                    "default": true,
-                    "type": "boolean"
-                },
-                "rust-analyzer.checkOnSave.extraArgs": {
+                "rust-analyzer.check.extraArgs": {
                     "markdownDescription": "Extra arguments for `cargo check`.",
                     "default": [],
                     "type": "array",
@@ -564,12 +580,12 @@
                         "type": "string"
                     }
                 },
-                "rust-analyzer.checkOnSave.extraEnv": {
+                "rust-analyzer.check.extraEnv": {
                     "markdownDescription": "Extra environment variables that will be set when running `cargo check`.\nExtends `#rust-analyzer.cargo.extraEnv#`.",
                     "default": {},
                     "type": "object"
                 },
-                "rust-analyzer.checkOnSave.features": {
+                "rust-analyzer.check.features": {
                     "markdownDescription": "List of features to activate. Defaults to\n`#rust-analyzer.cargo.features#`.\n\nSet to `\"all\"` to pass `--all-features` to Cargo.",
                     "default": null,
                     "anyOf": [
@@ -593,7 +609,7 @@
                         }
                     ]
                 },
-                "rust-analyzer.checkOnSave.invocationLocation": {
+                "rust-analyzer.check.invocationLocation": {
                     "markdownDescription": "Specifies the working directory for running checks.\n- \"workspace\": run checks for workspaces in the corresponding workspaces' root directories.\n    This falls back to \"root\" if `#rust-analyzer.cargo.checkOnSave.invocationStrategy#` is set to `once`.\n- \"root\": run checks in the project's root directory.\nThis config only has an effect when `#rust-analyzer.cargo.buildScripts.overrideCommand#`\nis set.",
                     "default": "workspace",
                     "type": "string",
@@ -606,7 +622,7 @@
                         "The command will be executed in the project root."
                     ]
                 },
-                "rust-analyzer.checkOnSave.invocationStrategy": {
+                "rust-analyzer.check.invocationStrategy": {
                     "markdownDescription": "Specifies the invocation strategy to use when running the checkOnSave command.\nIf `per_workspace` is set, the command will be executed for each workspace.\nIf `once` is set, the command will be executed once.\nThis config only has an effect when `#rust-analyzer.cargo.buildScripts.overrideCommand#`\nis set.",
                     "default": "per_workspace",
                     "type": "string",
@@ -619,7 +635,7 @@
                         "The command will be executed once."
                     ]
                 },
-                "rust-analyzer.checkOnSave.noDefaultFeatures": {
+                "rust-analyzer.check.noDefaultFeatures": {
                     "markdownDescription": "Whether to pass `--no-default-features` to Cargo. Defaults to\n`#rust-analyzer.cargo.noDefaultFeatures#`.",
                     "default": null,
                     "type": [
@@ -627,8 +643,8 @@
                         "boolean"
                     ]
                 },
-                "rust-analyzer.checkOnSave.overrideCommand": {
-                    "markdownDescription": "Override the command rust-analyzer uses instead of `cargo check` for\ndiagnostics on save. The command is required to output json and\nshould therefore include `--message-format=json` or a similar option.\n\nIf you're changing this because you're using some tool wrapping\nCargo, you might also want to change\n`#rust-analyzer.cargo.buildScripts.overrideCommand#`.\n\nIf there are multiple linked projects, this command is invoked for\neach of them, with the working directory being the project root\n(i.e., the folder containing the `Cargo.toml`).\n\nAn example command would be:\n\n```bash\ncargo check --workspace --message-format=json --all-targets\n```\n.",
+                "rust-analyzer.check.overrideCommand": {
+                    "markdownDescription": "Override the command rust-analyzer uses instead of `cargo check` for\ndiagnostics on save. The command is required to output json and\nshould therefore include `--message-format=json` or a similar option\n(if your client supports the `colorDiagnosticOutput` experimental\ncapability, you can use `--message-format=json-diagnostic-rendered-ansi`).\n\nIf you're changing this because you're using some tool wrapping\nCargo, you might also want to change\n`#rust-analyzer.cargo.buildScripts.overrideCommand#`.\n\nIf there are multiple linked projects, this command is invoked for\neach of them, with the working directory being the project root\n(i.e., the folder containing the `Cargo.toml`).\n\nAn example command would be:\n\n```bash\ncargo check --workspace --message-format=json --all-targets\n```\n.",
                     "default": null,
                     "type": [
                         "null",
@@ -638,10 +654,13 @@
                         "type": "string"
                     }
                 },
-                "rust-analyzer.checkOnSave.target": {
+                "rust-analyzer.check.targets": {
                     "markdownDescription": "Check for specific targets. Defaults to `#rust-analyzer.cargo.target#` if empty.\n\nCan be a single target, e.g. `\"x86_64-unknown-linux-gnu\"` or a list of targets, e.g.\n`[\"aarch64-apple-darwin\", \"x86_64-apple-darwin\"]`.\n\nAliased as `\"checkOnSave.targets\"`.",
-                    "default": [],
+                    "default": null,
                     "anyOf": [
+                        {
+                            "type": "null"
+                        },
                         {
                             "type": "string"
                         },
@@ -947,6 +966,21 @@
                         "Only show type hints for return types of closures with blocks."
                     ]
                 },
+                "rust-analyzer.inlayHints.discriminantHints.enable": {
+                    "markdownDescription": "Whether to show enum variant discriminant hints.",
+                    "default": "never",
+                    "type": "string",
+                    "enum": [
+                        "always",
+                        "never",
+                        "fieldless"
+                    ],
+                    "enumDescriptions": [
+                        "Always show all discriminant hints.",
+                        "Never show discriminant hints.",
+                        "Only show discriminant hints on fieldless enum variants."
+                    ]
+                },
                 "rust-analyzer.inlayHints.expressionAdjustmentHints.enable": {
                     "markdownDescription": "Whether to show inlay hints for type adjustments.",
                     "default": "never",
@@ -962,6 +996,28 @@
                         "Only show auto borrow and dereference adjustment hints."
                     ]
                 },
+                "rust-analyzer.inlayHints.expressionAdjustmentHints.hideOutsideUnsafe": {
+                    "markdownDescription": "Whether to hide inlay hints for type adjustments outside of `unsafe` blocks.",
+                    "default": false,
+                    "type": "boolean"
+                },
+                "rust-analyzer.inlayHints.expressionAdjustmentHints.mode": {
+                    "markdownDescription": "Whether to show inlay hints as postfix ops (`.*` instead of `*`, etc).",
+                    "default": "prefix",
+                    "type": "string",
+                    "enum": [
+                        "prefix",
+                        "postfix",
+                        "prefer_prefix",
+                        "prefer_postfix"
+                    ],
+                    "enumDescriptions": [
+                        "Always show adjustment hints as prefix (`*expr`).",
+                        "Always show adjustment hints as postfix (`expr.*`).",
+                        "Show prefix or postfix depending on which uses less parenthesis, prefering prefix.",
+                        "Show prefix or postfix depending on which uses less parenthesis, prefering postfix."
+                    ]
+                },
                 "rust-analyzer.inlayHints.lifetimeElisionHints.enable": {
                     "markdownDescription": "Whether to show inlay type hints for elided lifetimes in function signatures.",
                     "default": "never",
@@ -982,6 +1038,11 @@
                     "default": false,
                     "type": "boolean"
                 },
+                "rust-analyzer.inlayHints.locationLinks": {
+                    "markdownDescription": "Whether to use location links for parts of type mentioned in inlay hints.",
+                    "default": true,
+                    "type": "boolean"
+                },
                 "rust-analyzer.inlayHints.maxLength": {
                     "markdownDescription": "Maximum length for inlay hints. Set to null to have an unlimited length.",
                     "default": 25,
@@ -1134,6 +1195,15 @@
                     "default": true,
                     "type": "boolean"
                 },
+                "rust-analyzer.numThreads": {
+                    "markdownDescription": "How many worker threads in the main loop. The default `null` means to pick automatically.",
+                    "default": null,
+                    "type": [
+                        "null",
+                        "integer"
+                    ],
+                    "minimum": 0
+                },
                 "rust-analyzer.procMacro.attributes.enable": {
                     "markdownDescription": "Expand attribute macros. Requires `#rust-analyzer.procMacro.enable#` to be set.",
                     "default": true,
@@ -1493,6 +1563,11 @@
                 "description": "Style for derives",
                 "superType": "attribute"
             },
+            {
+                "id": "deriveHelper",
+                "description": "Style for derive helpers",
+                "superType": "attribute"
+            },
             {
                 "id": "dot",
                 "description": "Style for .",
@@ -1780,6 +1855,12 @@
                     "group": "navigation@1000"
                 }
             ]
-        }
+        },
+        "jsonValidation": [
+            {
+                "fileMatch": "rust-project.json",
+                "url": "https://json.schemastore.org/rust-project.json"
+            }
+        ]
     }
 }
diff --git a/editors/code/src/client.ts b/editors/code/src/client.ts
index 23e039722e..82cdf0390a 100644
--- a/editors/code/src/client.ts
+++ b/editors/code/src/client.ts
@@ -1,8 +1,10 @@
+import * as anser from "anser";
 import * as lc from "vscode-languageclient/node";
 import * as vscode from "vscode";
 import * as ra from "../src/lsp_ext";
 import * as Is from "vscode-languageclient/lib/common/utils/is";
 import { assert } from "./util";
+import * as diagnostics from "./diagnostics";
 import { WorkspaceEdit } from "vscode";
 import { Config, substituteVSCodeVariables } from "./config";
 import { randomUUID } from "crypto";
@@ -100,13 +102,32 @@ export async function createClient(
                     }
                 },
             },
+            async provideInlayHints(document, viewPort, token, next) {
+                const inlays = await next(document, viewPort, token);
+                if (!inlays) {
+                    return inlays;
+                }
+                // U+200C is a zero-width non-joiner to prevent the editor from forming a ligature
+                // between code and hints
+                for (const inlay of inlays) {
+                    if (typeof inlay.label === "string") {
+                        inlay.label = `\u{200c}${inlay.label}\u{200c}`;
+                    } else if (Array.isArray(inlay.label)) {
+                        for (const it of inlay.label) {
+                            it.value = `\u{200c}${it.value}\u{200c}`;
+                        }
+                    }
+                }
+                return inlays;
+            },
             async handleDiagnostics(
                 uri: vscode.Uri,
-                diagnostics: vscode.Diagnostic[],
+                diagnosticList: vscode.Diagnostic[],
                 next: lc.HandleDiagnosticsSignature
             ) {
                 const preview = config.previewRustcOutput;
-                diagnostics.forEach((diag, idx) => {
+                const errorCode = config.useRustcErrorCode;
+                diagnosticList.forEach((diag, idx) => {
                     // Abuse the fact that VSCode leaks the LSP diagnostics data field through the
                     // Diagnostic class, if they ever break this we are out of luck and have to go
                     // back to the worst diagnostics experience ever:)
@@ -119,23 +140,33 @@ export async function createClient(
                         ?.rendered;
                     if (rendered) {
                         if (preview) {
-                            const index = rendered.match(/^(note|help):/m)?.index || 0;
-                            diag.message = rendered
+                            const decolorized = anser.ansiToText(rendered);
+                            const index =
+                                decolorized.match(/^(note|help):/m)?.index || rendered.length;
+                            diag.message = decolorized
                                 .substring(0, index)
                                 .replace(/^ -->[^\n]+\n/m, "");
                         }
+                        let value;
+                        if (errorCode) {
+                            if (typeof diag.code === "string" || typeof diag.code === "number") {
+                                value = diag.code;
+                            } else {
+                                value = diag.code?.value;
+                            }
+                        }
                         diag.code = {
                             target: vscode.Uri.from({
-                                scheme: "rust-analyzer-diagnostics-view",
-                                path: "/diagnostic message",
+                                scheme: diagnostics.URI_SCHEME,
+                                path: `/diagnostic message [${idx.toString()}]`,
                                 fragment: uri.toString(),
                                 query: idx.toString(),
                             }),
-                            value: "Click for full compiler diagnostic",
+                            value: value ?? "Click for full compiler diagnostic",
                         };
                     }
                 });
-                return next(uri, diagnostics);
+                return next(uri, diagnosticList);
             },
             async provideHover(
                 document: vscode.TextDocument,
@@ -302,6 +333,7 @@ class ExperimentalFeatures implements lc.StaticFeature {
         caps.codeActionGroup = true;
         caps.hoverActions = true;
         caps.serverStatusNotification = true;
+        caps.colorDiagnosticOutput = true;
         caps.commands = {
             commands: [
                 "rust-analyzer.runSingle",
diff --git a/editors/code/src/commands.ts b/editors/code/src/commands.ts
index 312087e4cf..cb4e13e2c6 100644
--- a/editors/code/src/commands.ts
+++ b/editors/code/src/commands.ts
@@ -788,8 +788,23 @@ export function openDocs(ctx: CtxInit): Cmd {
 
 export function cancelFlycheck(ctx: CtxInit): Cmd {
     return async () => {
+        await ctx.client.sendNotification(ra.cancelFlycheck);
+    };
+}
+
+export function clearFlycheck(ctx: CtxInit): Cmd {
+    return async () => {
+        await ctx.client.sendNotification(ra.clearFlycheck);
+    };
+}
+
+export function runFlycheck(ctx: CtxInit): Cmd {
+    return async () => {
+        const editor = ctx.activeRustEditor;
         const client = ctx.client;
-        await client.sendRequest(ra.cancelFlycheck);
+        const params = editor ? { uri: editor.document.uri.toString() } : null;
+
+        await client.sendNotification(ra.runFlycheck, { textDocument: params });
     };
 }
 
@@ -797,12 +812,12 @@ export function resolveCodeAction(ctx: CtxInit): Cmd {
     return async (params: lc.CodeAction) => {
         const client = ctx.client;
         params.command = undefined;
-        const item = await client?.sendRequest(lc.CodeActionResolveRequest.type, params);
+        const item = await client.sendRequest(lc.CodeActionResolveRequest.type, params);
         if (!item?.edit) {
             return;
         }
         const itemEdit = item.edit;
-        const edit = await client?.protocol2CodeConverter.asWorkspaceEdit(itemEdit);
+        const edit = await client.protocol2CodeConverter.asWorkspaceEdit(itemEdit);
         // filter out all text edits and recreate the WorkspaceEdit without them so we can apply
         // snippet edits on our own
         const lcFileSystemEdit = {
diff --git a/editors/code/src/config.ts b/editors/code/src/config.ts
index d8dbd1df16..eb4f965291 100644
--- a/editors/code/src/config.ts
+++ b/editors/code/src/config.ts
@@ -241,6 +241,10 @@ export class Config {
     get previewRustcOutput() {
         return this.get<boolean>("diagnostics.previewRustcOutput");
     }
+
+    get useRustcErrorCode() {
+        return this.get<boolean>("diagnostics.useRustcErrorCode");
+    }
 }
 
 const VarRegex = new RegExp(/\$\{(.+?)\}/g);
diff --git a/editors/code/src/diagnostics.ts b/editors/code/src/diagnostics.ts
new file mode 100644
index 0000000000..9695d8bf26
--- /dev/null
+++ b/editors/code/src/diagnostics.ts
@@ -0,0 +1,212 @@
+import * as anser from "anser";
+import * as vscode from "vscode";
+import { ProviderResult, Range, TextEditorDecorationType, ThemeColor, window } from "vscode";
+import { Ctx } from "./ctx";
+
+export const URI_SCHEME = "rust-analyzer-diagnostics-view";
+
+export class TextDocumentProvider implements vscode.TextDocumentContentProvider {
+    private _onDidChange = new vscode.EventEmitter<vscode.Uri>();
+
+    public constructor(private readonly ctx: Ctx) {}
+
+    get onDidChange(): vscode.Event<vscode.Uri> {
+        return this._onDidChange.event;
+    }
+
+    triggerUpdate(uri: vscode.Uri) {
+        if (uri.scheme === URI_SCHEME) {
+            this._onDidChange.fire(uri);
+        }
+    }
+
+    dispose() {
+        this._onDidChange.dispose();
+    }
+
+    async provideTextDocumentContent(uri: vscode.Uri): Promise<string> {
+        const contents = getRenderedDiagnostic(this.ctx, uri);
+        return anser.ansiToText(contents);
+    }
+}
+
+function getRenderedDiagnostic(ctx: Ctx, uri: vscode.Uri): string {
+    const diags = ctx.client?.diagnostics?.get(vscode.Uri.parse(uri.fragment, true));
+    if (!diags) {
+        return "Unable to find original rustc diagnostic";
+    }
+
+    const diag = diags[parseInt(uri.query)];
+    if (!diag) {
+        return "Unable to find original rustc diagnostic";
+    }
+    const rendered = (diag as unknown as { data?: { rendered?: string } }).data?.rendered;
+
+    if (!rendered) {
+        return "Unable to find original rustc diagnostic";
+    }
+
+    return rendered;
+}
+
+interface AnserStyle {
+    fg: string;
+    bg: string;
+    fg_truecolor: string;
+    bg_truecolor: string;
+    decorations: Array<anser.DecorationName>;
+}
+
+export class AnsiDecorationProvider implements vscode.Disposable {
+    private _decorationTypes = new Map<AnserStyle, TextEditorDecorationType>();
+
+    public constructor(private readonly ctx: Ctx) {}
+
+    dispose(): void {
+        for (const decorationType of this._decorationTypes.values()) {
+            decorationType.dispose();
+        }
+
+        this._decorationTypes.clear();
+    }
+
+    async provideDecorations(editor: vscode.TextEditor) {
+        if (editor.document.uri.scheme !== URI_SCHEME) {
+            return;
+        }
+
+        const decorations = (await this._getDecorations(editor.document.uri)) || [];
+        for (const [decorationType, ranges] of decorations) {
+            editor.setDecorations(decorationType, ranges);
+        }
+    }
+
+    private _getDecorations(
+        uri: vscode.Uri
+    ): ProviderResult<[TextEditorDecorationType, Range[]][]> {
+        const stringContents = getRenderedDiagnostic(this.ctx, uri);
+        const lines = stringContents.split("\n");
+
+        const result = new Map<TextEditorDecorationType, Range[]>();
+        // Populate all known decoration types in the result. This forces any
+        // lingering decorations to be cleared if the text content changes to
+        // something without ANSI codes for a given decoration type.
+        for (const decorationType of this._decorationTypes.values()) {
+            result.set(decorationType, []);
+        }
+
+        for (const [lineNumber, line] of lines.entries()) {
+            const totalEscapeLength = 0;
+
+            // eslint-disable-next-line camelcase
+            const parsed = anser.ansiToJson(line, { use_classes: true });
+
+            let offset = 0;
+
+            for (const span of parsed) {
+                const { content, ...style } = span;
+
+                const range = new Range(
+                    lineNumber,
+                    offset - totalEscapeLength,
+                    lineNumber,
+                    offset + content.length - totalEscapeLength
+                );
+
+                offset += content.length;
+
+                const decorationType = this._getDecorationType(style);
+
+                if (!result.has(decorationType)) {
+                    result.set(decorationType, []);
+                }
+
+                result.get(decorationType)!.push(range);
+            }
+        }
+
+        return [...result];
+    }
+
+    private _getDecorationType(style: AnserStyle): TextEditorDecorationType {
+        let decorationType = this._decorationTypes.get(style);
+
+        if (decorationType) {
+            return decorationType;
+        }
+
+        const fontWeight = style.decorations.find((s) => s === "bold");
+        const fontStyle = style.decorations.find((s) => s === "italic");
+        const textDecoration = style.decorations.find((s) => s === "underline");
+
+        decorationType = window.createTextEditorDecorationType({
+            backgroundColor: AnsiDecorationProvider._convertColor(style.bg, style.bg_truecolor),
+            color: AnsiDecorationProvider._convertColor(style.fg, style.fg_truecolor),
+            fontWeight,
+            fontStyle,
+            textDecoration,
+        });
+
+        this._decorationTypes.set(style, decorationType);
+
+        return decorationType;
+    }
+
+    // NOTE: This could just be a kebab-case to camelCase conversion, but I think it's
+    // a short enough list to just write these by hand
+    static readonly _anserToThemeColor: Record<string, ThemeColor> = {
+        "ansi-black": "ansiBlack",
+        "ansi-white": "ansiWhite",
+        "ansi-red": "ansiRed",
+        "ansi-green": "ansiGreen",
+        "ansi-yellow": "ansiYellow",
+        "ansi-blue": "ansiBlue",
+        "ansi-magenta": "ansiMagenta",
+        "ansi-cyan": "ansiCyan",
+
+        "ansi-bright-black": "ansiBrightBlack",
+        "ansi-bright-white": "ansiBrightWhite",
+        "ansi-bright-red": "ansiBrightRed",
+        "ansi-bright-green": "ansiBrightGreen",
+        "ansi-bright-yellow": "ansiBrightYellow",
+        "ansi-bright-blue": "ansiBrightBlue",
+        "ansi-bright-magenta": "ansiBrightMagenta",
+        "ansi-bright-cyan": "ansiBrightCyan",
+    };
+
+    private static _convertColor(
+        color?: string,
+        truecolor?: string
+    ): ThemeColor | string | undefined {
+        if (!color) {
+            return undefined;
+        }
+
+        if (color === "ansi-truecolor") {
+            if (!truecolor) {
+                return undefined;
+            }
+            return `rgb(${truecolor})`;
+        }
+
+        const paletteMatch = color.match(/ansi-palette-(.+)/);
+        if (paletteMatch) {
+            const paletteColor = paletteMatch[1];
+            // anser won't return both the RGB and the color name at the same time,
+            // so just fake a single foreground control char with the palette number:
+            const spans = anser.ansiToJson(`\x1b[38;5;${paletteColor}m`);
+            const rgb = spans[1].fg;
+
+            if (rgb) {
+                return `rgb(${rgb})`;
+            }
+        }
+
+        const themeColor = AnsiDecorationProvider._anserToThemeColor[color];
+        if (themeColor) {
+            return new ThemeColor("terminal." + themeColor);
+        }
+
+        return undefined;
+    }
+}
diff --git a/editors/code/src/lsp_ext.ts b/editors/code/src/lsp_ext.ts
index 875261c48a..29349cc20f 100644
--- a/editors/code/src/lsp_ext.ts
+++ b/editors/code/src/lsp_ext.ts
@@ -79,7 +79,11 @@ export const relatedTests = new lc.RequestType<lc.TextDocumentPositionParams, Te
     "rust-analyzer/relatedTests"
 );
 
-export const cancelFlycheck = new lc.RequestType0<void, void>("rust-analyzer/cancelFlycheck");
+export const cancelFlycheck = new lc.NotificationType0("rust-analyzer/cancelFlycheck");
+export const clearFlycheck = new lc.NotificationType0("rust-analyzer/clearFlycheck");
+export const runFlycheck = new lc.NotificationType<{
+    textDocument: lc.TextDocumentIdentifier | null;
+}>("rust-analyzer/runFlycheck");
 
 // Experimental extensions
 
diff --git a/editors/code/src/main.ts b/editors/code/src/main.ts
index 25f1e83d10..dd439317c7 100644
--- a/editors/code/src/main.ts
+++ b/editors/code/src/main.ts
@@ -3,6 +3,7 @@ import * as lc from "vscode-languageclient/node";
 
 import * as commands from "./commands";
 import { CommandFactory, Ctx, fetchWorkspace } from "./ctx";
+import * as diagnostics from "./diagnostics";
 import { activateTaskProvider } from "./tasks";
 import { setContextValue } from "./util";
 
@@ -48,30 +49,52 @@ async function activateServer(ctx: Ctx): Promise<RustAnalyzerExtensionApi> {
         ctx.pushExtCleanup(activateTaskProvider(ctx.config));
     }
 
+    const diagnosticProvider = new diagnostics.TextDocumentProvider(ctx);
     ctx.pushExtCleanup(
         vscode.workspace.registerTextDocumentContentProvider(
-            "rust-analyzer-diagnostics-view",
-            new (class implements vscode.TextDocumentContentProvider {
-                async provideTextDocumentContent(uri: vscode.Uri): Promise<string> {
-                    const diags = ctx.client?.diagnostics?.get(
-                        vscode.Uri.parse(uri.fragment, true)
-                    );
-                    if (!diags) {
-                        return "Unable to find original rustc diagnostic";
-                    }
-
-                    const diag = diags[parseInt(uri.query)];
-                    if (!diag) {
-                        return "Unable to find original rustc diagnostic";
-                    }
-                    const rendered = (diag as unknown as { data?: { rendered?: string } }).data
-                        ?.rendered;
-                    return rendered ?? "Unable to find original rustc diagnostic";
-                }
-            })()
+            diagnostics.URI_SCHEME,
+            diagnosticProvider
         )
     );
 
+    const decorationProvider = new diagnostics.AnsiDecorationProvider(ctx);
+    ctx.pushExtCleanup(decorationProvider);
+
+    async function decorateVisibleEditors(document: vscode.TextDocument) {
+        for (const editor of vscode.window.visibleTextEditors) {
+            if (document === editor.document) {
+                await decorationProvider.provideDecorations(editor);
+            }
+        }
+    }
+
+    vscode.workspace.onDidChangeTextDocument(
+        async (event) => await decorateVisibleEditors(event.document),
+        null,
+        ctx.subscriptions
+    );
+    vscode.workspace.onDidOpenTextDocument(decorateVisibleEditors, null, ctx.subscriptions);
+    vscode.window.onDidChangeActiveTextEditor(
+        async (editor) => {
+            if (editor) {
+                diagnosticProvider.triggerUpdate(editor.document.uri);
+                await decorateVisibleEditors(editor.document);
+            }
+        },
+        null,
+        ctx.subscriptions
+    );
+    vscode.window.onDidChangeVisibleTextEditors(
+        async (visibleEditors) => {
+            for (const editor of visibleEditors) {
+                diagnosticProvider.triggerUpdate(editor.document.uri);
+                await decorationProvider.provideDecorations(editor);
+            }
+        },
+        null,
+        ctx.subscriptions
+    );
+
     vscode.workspace.onDidChangeWorkspaceFolders(
         async (_) => ctx.onWorkspaceFolderChanges(),
         null,
@@ -79,7 +102,7 @@ async function activateServer(ctx: Ctx): Promise<RustAnalyzerExtensionApi> {
     );
     vscode.workspace.onDidChangeConfiguration(
         async (_) => {
-            await ctx.client?.sendNotification("workspace/didChangeConfiguration", {
+            await ctx.client?.sendNotification(lc.DidChangeConfigurationNotification.type, {
                 settings: "",
             });
         },
@@ -150,6 +173,8 @@ function createCommands(): Record<string, CommandFactory> {
         moveItemUp: { enabled: commands.moveItemUp },
         moveItemDown: { enabled: commands.moveItemDown },
         cancelFlycheck: { enabled: commands.cancelFlycheck },
+        clearFlycheck: { enabled: commands.clearFlycheck },
+        runFlycheck: { enabled: commands.runFlycheck },
         ssr: { enabled: commands.ssr },
         serverVersion: { enabled: commands.serverVersion },
         // Internal commands which are invoked by the server.
diff --git a/lib/la-arena/src/map.rs b/lib/la-arena/src/map.rs
index 5f347e2745..b9d491da3c 100644
--- a/lib/la-arena/src/map.rs
+++ b/lib/la-arena/src/map.rs
@@ -86,6 +86,14 @@ impl<T, V> ArenaMap<Idx<T>, V> {
         self.v.iter().enumerate().filter_map(|(idx, o)| Some((Self::from_idx(idx), o.as_ref()?)))
     }
 
+    /// Returns an iterator over the arena indexes and values in the map.
+    pub fn iter_mut(&mut self) -> impl Iterator<Item = (Idx<T>, &mut V)> {
+        self.v
+            .iter_mut()
+            .enumerate()
+            .filter_map(|(idx, o)| Some((Self::from_idx(idx), o.as_mut()?)))
+    }
+
     /// Gets the given key's corresponding entry in the map for in-place manipulation.
     pub fn entry(&mut self, idx: Idx<T>) -> Entry<'_, Idx<T>, V> {
         let idx = Self::to_idx(idx);
diff --git a/lib/lsp-server/examples/goto_def.rs b/lib/lsp-server/examples/goto_def.rs
index ca7ad0b536..2f270afbbf 100644
--- a/lib/lsp-server/examples/goto_def.rs
+++ b/lib/lsp-server/examples/goto_def.rs
@@ -80,32 +80,32 @@ fn main_loop(
     let _params: InitializeParams = serde_json::from_value(params).unwrap();
     eprintln!("starting example main loop");
     for msg in &connection.receiver {
-        eprintln!("got msg: {:?}", msg);
+        eprintln!("got msg: {msg:?}");
         match msg {
             Message::Request(req) => {
                 if connection.handle_shutdown(&req)? {
                     return Ok(());
                 }
-                eprintln!("got request: {:?}", req);
+                eprintln!("got request: {req:?}");
                 match cast::<GotoDefinition>(req) {
                     Ok((id, params)) => {
-                        eprintln!("got gotoDefinition request #{}: {:?}", id, params);
+                        eprintln!("got gotoDefinition request #{id}: {params:?}");
                         let result = Some(GotoDefinitionResponse::Array(Vec::new()));
                         let result = serde_json::to_value(&result).unwrap();
                         let resp = Response { id, result: Some(result), error: None };
                         connection.sender.send(Message::Response(resp))?;
                         continue;
                     }
-                    Err(err @ ExtractError::JsonError { .. }) => panic!("{:?}", err),
+                    Err(err @ ExtractError::JsonError { .. }) => panic!("{err:?}"),
                     Err(ExtractError::MethodMismatch(req)) => req,
                 };
                 // ...
             }
             Message::Response(resp) => {
-                eprintln!("got response: {:?}", resp);
+                eprintln!("got response: {resp:?}");
             }
             Message::Notification(not) => {
-                eprintln!("got notification: {:?}", not);
+                eprintln!("got notification: {not:?}");
             }
         }
     }
diff --git a/lib/lsp-server/src/lib.rs b/lib/lsp-server/src/lib.rs
index d567077d4a..beccde40a8 100644
--- a/lib/lsp-server/src/lib.rs
+++ b/lib/lsp-server/src/lib.rs
@@ -114,30 +114,21 @@ impl Connection {
     /// ```
     pub fn initialize_start(&self) -> Result<(RequestId, serde_json::Value), ProtocolError> {
         loop {
-            match self.receiver.recv() {
-                Ok(Message::Request(req)) if req.is_initialize() => {
-                    return Ok((req.id, req.params))
-                }
+            break match self.receiver.recv() {
+                Ok(Message::Request(req)) if req.is_initialize() => Ok((req.id, req.params)),
                 // Respond to non-initialize requests with ServerNotInitialized
                 Ok(Message::Request(req)) => {
                     let resp = Response::new_err(
                         req.id.clone(),
                         ErrorCode::ServerNotInitialized as i32,
-                        format!("expected initialize request, got {:?}", req),
+                        format!("expected initialize request, got {req:?}"),
                     );
                     self.sender.send(resp.into()).unwrap();
+                    continue;
                 }
-                Ok(msg) => {
-                    return Err(ProtocolError(format!(
-                        "expected initialize request, got {:?}",
-                        msg
-                    )))
-                }
+                Ok(msg) => Err(ProtocolError(format!("expected initialize request, got {msg:?}"))),
                 Err(e) => {
-                    return Err(ProtocolError(format!(
-                        "expected initialize request, got error: {}",
-                        e
-                    )))
+                    Err(ProtocolError(format!("expected initialize request, got error: {e}")))
                 }
             };
         }
@@ -152,21 +143,14 @@ impl Connection {
         let resp = Response::new_ok(initialize_id, initialize_result);
         self.sender.send(resp.into()).unwrap();
         match &self.receiver.recv() {
-            Ok(Message::Notification(n)) if n.is_initialized() => (),
+            Ok(Message::Notification(n)) if n.is_initialized() => Ok(()),
             Ok(msg) => {
-                return Err(ProtocolError(format!(
-                    "expected Message::Notification, got: {:?}",
-                    msg,
-                )))
+                Err(ProtocolError(format!(r#"expected initialized notification, got: {msg:?}"#)))
             }
             Err(e) => {
-                return Err(ProtocolError(format!(
-                    "expected initialized notification, got error: {}",
-                    e,
-                )))
+                Err(ProtocolError(format!("expected initialized notification, got error: {e}",)))
             }
         }
-        Ok(())
     }
 
     /// Initialize the connection. Sends the server capabilities
@@ -221,11 +205,9 @@ impl Connection {
         match &self.receiver.recv_timeout(std::time::Duration::from_secs(30)) {
             Ok(Message::Notification(n)) if n.is_exit() => (),
             Ok(msg) => {
-                return Err(ProtocolError(format!("unexpected message during shutdown: {:?}", msg)))
-            }
-            Err(e) => {
-                return Err(ProtocolError(format!("unexpected error during shutdown: {}", e)))
+                return Err(ProtocolError(format!("unexpected message during shutdown: {msg:?}")))
             }
+            Err(e) => return Err(ProtocolError(format!("unexpected error during shutdown: {e}"))),
         }
         Ok(true)
     }
diff --git a/xtask/Cargo.toml b/xtask/Cargo.toml
index 95e27beab5..2dd01796c6 100644
--- a/xtask/Cargo.toml
+++ b/xtask/Cargo.toml
@@ -12,4 +12,5 @@ flate2 = "1.0.24"
 write-json = "0.1.2"
 xshell = "0.2.2"
 xflags = "0.3.0"
+zip = { version = "0.6", default-features = false, features = ["deflate", "time"] }
 # Avoid adding more dependencies to this crate
diff --git a/xtask/src/dist.rs b/xtask/src/dist.rs
index 686aec4ae5..74715c53ea 100644
--- a/xtask/src/dist.rs
+++ b/xtask/src/dist.rs
@@ -1,12 +1,13 @@
 use std::{
     env,
     fs::File,
-    io,
+    io::{self, BufWriter},
     path::{Path, PathBuf},
 };
 
 use flate2::{write::GzEncoder, Compression};
 use xshell::{cmd, Shell};
+use zip::{write::FileOptions, DateTime, ZipWriter};
 
 use crate::{date_iso, flags, project_root};
 
@@ -26,10 +27,10 @@ impl flags::Dist {
 
         if let Some(patch_version) = self.client_patch_version {
             let version = if stable {
-                format!("{}.{}", VERSION_STABLE, patch_version)
+                format!("{VERSION_STABLE}.{patch_version}")
             } else {
                 // A hack to make VS Code prefer nightly over stable.
-                format!("{}.{}", VERSION_NIGHTLY, patch_version)
+                format!("{VERSION_NIGHTLY}.{patch_version}")
             };
             dist_server(sh, &format!("{version}-standalone"), &target)?;
             let release_tag = if stable { date_iso(sh)? } else { "nightly".to_string() };
@@ -59,10 +60,10 @@ fn dist_client(
     let mut patch = Patch::new(sh, "./package.json")?;
     patch
         .replace(
-            &format!(r#""version": "{}.0-dev""#, VERSION_DEV),
-            &format!(r#""version": "{}""#, version),
+            &format!(r#""version": "{VERSION_DEV}.0-dev""#),
+            &format!(r#""version": "{version}""#),
         )
-        .replace(r#""releaseTag": null"#, &format!(r#""releaseTag": "{}""#, release_tag))
+        .replace(r#""releaseTag": null"#, &format!(r#""releaseTag": "{release_tag}""#))
         .replace(r#""$generated-start": {},"#, "")
         .replace(",\n                \"$generated-end\": {}", "")
         .replace(r#""enabledApiProposals": [],"#, r#""#);
@@ -89,6 +90,9 @@ fn dist_server(sh: &Shell, release: &str, target: &Target) -> anyhow::Result<()>
 
     let dst = Path::new("dist").join(&target.artifact_name);
     gzip(&target.server_path, &dst.with_extension("gz"))?;
+    if target_name.contains("-windows-") {
+        zip(&target.server_path, target.symbols_path.as_ref(), &dst.with_extension("zip"))?;
+    }
 
     Ok(())
 }
@@ -101,6 +105,38 @@ fn gzip(src_path: &Path, dest_path: &Path) -> anyhow::Result<()> {
     Ok(())
 }
 
+fn zip(src_path: &Path, symbols_path: Option<&PathBuf>, dest_path: &Path) -> anyhow::Result<()> {
+    let file = File::create(dest_path)?;
+    let mut writer = ZipWriter::new(BufWriter::new(file));
+    writer.start_file(
+        src_path.file_name().unwrap().to_str().unwrap(),
+        FileOptions::default()
+            .last_modified_time(
+                DateTime::from_time(std::fs::metadata(src_path)?.modified()?.into()).unwrap(),
+            )
+            .unix_permissions(0o755)
+            .compression_method(zip::CompressionMethod::Deflated)
+            .compression_level(Some(9)),
+    )?;
+    let mut input = io::BufReader::new(File::open(src_path)?);
+    io::copy(&mut input, &mut writer)?;
+    if let Some(symbols_path) = symbols_path {
+        writer.start_file(
+            symbols_path.file_name().unwrap().to_str().unwrap(),
+            FileOptions::default()
+                .last_modified_time(
+                    DateTime::from_time(std::fs::metadata(src_path)?.modified()?.into()).unwrap(),
+                )
+                .compression_method(zip::CompressionMethod::Deflated)
+                .compression_level(Some(9)),
+        )?;
+        let mut input = io::BufReader::new(File::open(symbols_path)?);
+        io::copy(&mut input, &mut writer)?;
+    }
+    writer.finish()?;
+    Ok(())
+}
+
 struct Target {
     name: String,
     server_path: PathBuf,
@@ -130,8 +166,8 @@ impl Target {
         } else {
             (String::new(), None)
         };
-        let server_path = out_path.join(format!("rust-analyzer{}", exe_suffix));
-        let artifact_name = format!("rust-analyzer-{}{}", name, exe_suffix);
+        let server_path = out_path.join(format!("rust-analyzer{exe_suffix}"));
+        let artifact_name = format!("rust-analyzer-{name}{exe_suffix}");
         Self { name, server_path, symbols_path, artifact_name }
     }
 }
diff --git a/xtask/src/flags.rs b/xtask/src/flags.rs
index 0fce488983..2100479701 100644
--- a/xtask/src/flags.rs
+++ b/xtask/src/flags.rs
@@ -34,6 +34,13 @@ xflags::xflags! {
         cmd dist {
             optional --client-patch-version version: String
         }
+        /// Read a changelog AsciiDoc file and update the GitHub Releases entry in Markdown.
+        cmd publish-release-notes {
+            /// Only run conversion and show the result.
+            optional --dry-run
+            /// Target changelog file.
+            required changelog: String
+        }
         cmd metrics {
             optional --dry-run
         }
@@ -59,6 +66,7 @@ pub enum XtaskCmd {
     Release(Release),
     Promote(Promote),
     Dist(Dist),
+    PublishReleaseNotes(PublishReleaseNotes),
     Metrics(Metrics),
     Bb(Bb),
 }
@@ -90,6 +98,13 @@ pub struct Dist {
     pub client_patch_version: Option<String>,
 }
 
+#[derive(Debug)]
+pub struct PublishReleaseNotes {
+    pub changelog: String,
+
+    pub dry_run: bool,
+}
+
 #[derive(Debug)]
 pub struct Metrics {
     pub dry_run: bool,
diff --git a/xtask/src/install.rs b/xtask/src/install.rs
index ae978d5512..83223a551d 100644
--- a/xtask/src/install.rs
+++ b/xtask/src/install.rs
@@ -62,7 +62,7 @@ fn fix_path_for_mac(sh: &Shell) -> Result<()> {
         let mut paths = env::split_paths(&vars).collect::<Vec<_>>();
         paths.append(&mut vscode_path);
         let new_paths = env::join_paths(paths).context("build env PATH")?;
-        sh.set_var("PATH", &new_paths);
+        sh.set_var("PATH", new_paths);
     }
 
     Ok(())
diff --git a/xtask/src/main.rs b/xtask/src/main.rs
index a37f469adc..6a45033ada 100644
--- a/xtask/src/main.rs
+++ b/xtask/src/main.rs
@@ -15,6 +15,7 @@ mod flags;
 mod install;
 mod release;
 mod dist;
+mod publish;
 mod metrics;
 
 use anyhow::bail;
@@ -36,6 +37,7 @@ fn main() -> anyhow::Result<()> {
         flags::XtaskCmd::Release(cmd) => cmd.run(sh),
         flags::XtaskCmd::Promote(cmd) => cmd.run(sh),
         flags::XtaskCmd::Dist(cmd) => cmd.run(sh),
+        flags::XtaskCmd::PublishReleaseNotes(cmd) => cmd.run(sh),
         flags::XtaskCmd::Metrics(cmd) => cmd.run(sh),
         flags::XtaskCmd::Bb(cmd) => {
             {
diff --git a/xtask/src/metrics.rs b/xtask/src/metrics.rs
index ebeb873463..b6f730dbf1 100644
--- a/xtask/src/metrics.rs
+++ b/xtask/src/metrics.rs
@@ -87,7 +87,7 @@ impl Metrics {
         self.measure_analysis_stats_path(
             sh,
             bench,
-            &format!("./target/rustc-perf/collector/benchmarks/{}", bench),
+            &format!("./target/rustc-perf/collector/benchmarks/{bench}"),
         )
     }
     fn measure_analysis_stats_path(
diff --git a/xtask/src/publish.rs b/xtask/src/publish.rs
new file mode 100644
index 0000000000..79b5f3d2f6
--- /dev/null
+++ b/xtask/src/publish.rs
@@ -0,0 +1,109 @@
+mod notes;
+
+use crate::flags;
+use anyhow::{anyhow, bail, Result};
+use std::env;
+use xshell::{cmd, Shell};
+
+impl flags::PublishReleaseNotes {
+    pub(crate) fn run(self, sh: &Shell) -> Result<()> {
+        let asciidoc = sh.read_file(&self.changelog)?;
+        let mut markdown = notes::convert_asciidoc_to_markdown(std::io::Cursor::new(&asciidoc))?;
+        let file_name = check_file_name(self.changelog)?;
+        let tag_name = &file_name[0..10];
+        let original_changelog_url = create_original_changelog_url(&file_name);
+        let additional_paragraph =
+            format!("\nSee also [original changelog]({original_changelog_url}).");
+        markdown.push_str(&additional_paragraph);
+        if self.dry_run {
+            println!("{markdown}");
+        } else {
+            update_release(sh, tag_name, &markdown)?;
+        }
+        Ok(())
+    }
+}
+
+fn check_file_name<P: AsRef<std::path::Path>>(path: P) -> Result<String> {
+    let file_name = path
+        .as_ref()
+        .file_name()
+        .ok_or_else(|| anyhow!("file name is not specified as `changelog`"))?
+        .to_string_lossy();
+
+    let mut chars = file_name.chars();
+    if file_name.len() >= 10
+        && chars.next().unwrap().is_ascii_digit()
+        && chars.next().unwrap().is_ascii_digit()
+        && chars.next().unwrap().is_ascii_digit()
+        && chars.next().unwrap().is_ascii_digit()
+        && chars.next().unwrap() == '-'
+        && chars.next().unwrap().is_ascii_digit()
+        && chars.next().unwrap().is_ascii_digit()
+        && chars.next().unwrap() == '-'
+        && chars.next().unwrap().is_ascii_digit()
+        && chars.next().unwrap().is_ascii_digit()
+    {
+        Ok(file_name.to_string())
+    } else {
+        bail!("unexpected file name format; no date information prefixed")
+    }
+}
+
+fn create_original_changelog_url(file_name: &str) -> String {
+    let year = &file_name[0..4];
+    let month = &file_name[5..7];
+    let day = &file_name[8..10];
+    let mut stem = &file_name[11..];
+    if let Some(stripped) = stem.strip_suffix(".adoc") {
+        stem = stripped;
+    }
+    format!("https://rust-analyzer.github.io/thisweek/{year}/{month}/{day}/{stem}.html")
+}
+
+fn update_release(sh: &Shell, tag_name: &str, release_notes: &str) -> Result<()> {
+    let token = match env::var("GITHUB_TOKEN") {
+        Ok(token) => token,
+        Err(_) => bail!("Please obtain a personal access token from https://github.com/settings/tokens and set the `GITHUB_TOKEN` environment variable."),
+    };
+    let accept = "Accept: application/vnd.github+json";
+    let authorization = format!("Authorization: Bearer {token}");
+    let api_version = "X-GitHub-Api-Version: 2022-11-28";
+    let release_url = "https://api.github.com/repos/rust-lang/rust-analyzer/releases";
+
+    let release_json = cmd!(
+        sh,
+        "curl -sf -H {accept} -H {authorization} -H {api_version} {release_url}/tags/{tag_name}"
+    )
+    .read()?;
+    let release_id = cmd!(sh, "jq .id").stdin(release_json).read()?;
+
+    let mut patch = String::new();
+    write_json::object(&mut patch)
+        .string("tag_name", tag_name)
+        .string("target_commitish", "master")
+        .string("name", tag_name)
+        .string("body", release_notes)
+        .bool("draft", false)
+        .bool("prerelease", false);
+    let _ = cmd!(
+        sh,
+        "curl -sf -X PATCH -H {accept} -H {authorization} -H {api_version} {release_url}/{release_id} -d {patch}"
+    )
+    .read()?;
+
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn original_changelog_url_creation() {
+        let input = "2019-07-24-changelog-0.adoc";
+        let actual = create_original_changelog_url(input);
+        let expected = "https://rust-analyzer.github.io/thisweek/2019/07/24/changelog-0.html";
+        assert_eq!(actual, expected);
+    }
+}
diff --git a/xtask/src/publish/notes.rs b/xtask/src/publish/notes.rs
new file mode 100644
index 0000000000..c30267295b
--- /dev/null
+++ b/xtask/src/publish/notes.rs
@@ -0,0 +1,631 @@
+use anyhow::{anyhow, bail};
+use std::{
+    borrow::Cow,
+    io::{BufRead, Lines},
+    iter::Peekable,
+};
+
+const LISTING_DELIMITER: &str = "----";
+const IMAGE_BLOCK_PREFIX: &str = "image::";
+const VIDEO_BLOCK_PREFIX: &str = "video::";
+
+struct Converter<'a, 'b, R: BufRead> {
+    iter: &'a mut Peekable<Lines<R>>,
+    output: &'b mut String,
+}
+
+impl<'a, 'b, R: BufRead> Converter<'a, 'b, R> {
+    fn new(iter: &'a mut Peekable<Lines<R>>, output: &'b mut String) -> Self {
+        Self { iter, output }
+    }
+
+    fn process(&mut self) -> anyhow::Result<()> {
+        self.process_document_header()?;
+        self.skip_blank_lines()?;
+        self.output.push('\n');
+
+        loop {
+            let line = self.iter.peek().unwrap().as_deref().map_err(|e| anyhow!("{e}"))?;
+            if get_title(line).is_some() {
+                let line = self.iter.next().unwrap().unwrap();
+                let (level, title) = get_title(&line).unwrap();
+                self.write_title(level, title);
+            } else if get_list_item(line).is_some() {
+                self.process_list()?;
+            } else if line.starts_with('[') {
+                self.process_source_code_block(0)?;
+            } else if line.starts_with(LISTING_DELIMITER) {
+                self.process_listing_block(None, 0)?;
+            } else if line.starts_with('.') {
+                self.process_block_with_title(0)?;
+            } else if line.starts_with(IMAGE_BLOCK_PREFIX) {
+                self.process_image_block(None, 0)?;
+            } else if line.starts_with(VIDEO_BLOCK_PREFIX) {
+                self.process_video_block(None, 0)?;
+            } else {
+                self.process_paragraph(0, |line| line.is_empty())?;
+            }
+
+            self.skip_blank_lines()?;
+            if self.iter.peek().is_none() {
+                break;
+            }
+            self.output.push('\n');
+        }
+        Ok(())
+    }
+
+    fn process_document_header(&mut self) -> anyhow::Result<()> {
+        self.process_document_title()?;
+
+        while let Some(line) = self.iter.next() {
+            let line = line?;
+            if line.is_empty() {
+                break;
+            }
+            if !line.starts_with(':') {
+                self.write_line(&line, 0)
+            }
+        }
+
+        Ok(())
+    }
+
+    fn process_document_title(&mut self) -> anyhow::Result<()> {
+        if let Some(Ok(line)) = self.iter.next() {
+            if let Some((level, title)) = get_title(&line) {
+                let title = process_inline_macros(title)?;
+                if level == 1 {
+                    self.write_title(level, &title);
+                    return Ok(());
+                }
+            }
+        }
+        bail!("document title not found")
+    }
+
+    fn process_list(&mut self) -> anyhow::Result<()> {
+        let mut nesting = ListNesting::new();
+        while let Some(line) = self.iter.peek() {
+            let line = line.as_deref().map_err(|e| anyhow!("{e}"))?;
+
+            if get_list_item(line).is_some() {
+                let line = self.iter.next().unwrap()?;
+                let line = process_inline_macros(&line)?;
+                let (marker, item) = get_list_item(&line).unwrap();
+                nesting.set_current(marker);
+                self.write_list_item(item, &nesting);
+                self.process_paragraph(nesting.indent(), |line| {
+                    line.is_empty() || get_list_item(line).is_some() || line == "+"
+                })?;
+            } else if line == "+" {
+                let _ = self.iter.next().unwrap()?;
+                let line = self
+                    .iter
+                    .peek()
+                    .ok_or_else(|| anyhow!("list continuation unexpectedly terminated"))?;
+                let line = line.as_deref().map_err(|e| anyhow!("{e}"))?;
+
+                let indent = nesting.indent();
+                if line.starts_with('[') {
+                    self.write_line("", 0);
+                    self.process_source_code_block(indent)?;
+                } else if line.starts_with(LISTING_DELIMITER) {
+                    self.write_line("", 0);
+                    self.process_listing_block(None, indent)?;
+                } else if line.starts_with('.') {
+                    self.write_line("", 0);
+                    self.process_block_with_title(indent)?;
+                } else if line.starts_with(IMAGE_BLOCK_PREFIX) {
+                    self.write_line("", 0);
+                    self.process_image_block(None, indent)?;
+                } else if line.starts_with(VIDEO_BLOCK_PREFIX) {
+                    self.write_line("", 0);
+                    self.process_video_block(None, indent)?;
+                } else {
+                    self.write_line("", 0);
+                    let current = nesting.current().unwrap();
+                    self.process_paragraph(indent, |line| {
+                        line.is_empty()
+                            || get_list_item(line).filter(|(m, _)| m == current).is_some()
+                            || line == "+"
+                    })?;
+                }
+            } else {
+                break;
+            }
+            self.skip_blank_lines()?;
+        }
+
+        Ok(())
+    }
+
+    fn process_source_code_block(&mut self, level: usize) -> anyhow::Result<()> {
+        if let Some(Ok(line)) = self.iter.next() {
+            if let Some(styles) = line.strip_prefix("[source").and_then(|s| s.strip_suffix(']')) {
+                let mut styles = styles.split(',');
+                if !styles.next().unwrap().is_empty() {
+                    bail!("not a source code block");
+                }
+                let language = styles.next();
+                return self.process_listing_block(language, level);
+            }
+        }
+        bail!("not a source code block")
+    }
+
+    fn process_listing_block(&mut self, style: Option<&str>, level: usize) -> anyhow::Result<()> {
+        if let Some(Ok(line)) = self.iter.next() {
+            if line == LISTING_DELIMITER {
+                self.write_indent(level);
+                self.output.push_str("```");
+                if let Some(style) = style {
+                    self.output.push_str(style);
+                }
+                self.output.push('\n');
+                while let Some(line) = self.iter.next() {
+                    let line = line?;
+                    if line == LISTING_DELIMITER {
+                        self.write_line("```", level);
+                        return Ok(());
+                    } else {
+                        self.write_line(&line, level);
+                    }
+                }
+                bail!("listing block is not terminated")
+            }
+        }
+        bail!("not a listing block")
+    }
+
+    fn process_block_with_title(&mut self, level: usize) -> anyhow::Result<()> {
+        if let Some(Ok(line)) = self.iter.next() {
+            let title =
+                line.strip_prefix('.').ok_or_else(|| anyhow!("extraction of the title failed"))?;
+
+            let line = self
+                .iter
+                .peek()
+                .ok_or_else(|| anyhow!("target block for the title is not found"))?;
+            let line = line.as_deref().map_err(|e| anyhow!("{e}"))?;
+            if line.starts_with(IMAGE_BLOCK_PREFIX) {
+                return self.process_image_block(Some(title), level);
+            } else if line.starts_with(VIDEO_BLOCK_PREFIX) {
+                return self.process_video_block(Some(title), level);
+            } else {
+                bail!("title for that block type is not supported");
+            }
+        }
+        bail!("not a title")
+    }
+
+    fn process_image_block(&mut self, caption: Option<&str>, level: usize) -> anyhow::Result<()> {
+        if let Some(Ok(line)) = self.iter.next() {
+            if let Some((url, attrs)) = parse_media_block(&line, IMAGE_BLOCK_PREFIX) {
+                let alt = if let Some(stripped) =
+                    attrs.strip_prefix('"').and_then(|s| s.strip_suffix('"'))
+                {
+                    stripped
+                } else {
+                    attrs
+                };
+                if let Some(caption) = caption {
+                    self.write_caption_line(caption, level);
+                }
+                self.write_indent(level);
+                self.output.push_str("![");
+                self.output.push_str(alt);
+                self.output.push_str("](");
+                self.output.push_str(url);
+                self.output.push_str(")\n");
+                return Ok(());
+            }
+        }
+        bail!("not a image block")
+    }
+
+    fn process_video_block(&mut self, caption: Option<&str>, level: usize) -> anyhow::Result<()> {
+        if let Some(Ok(line)) = self.iter.next() {
+            if let Some((url, attrs)) = parse_media_block(&line, VIDEO_BLOCK_PREFIX) {
+                let html_attrs = match attrs {
+                    "options=loop" => "controls loop",
+                    r#"options="autoplay,loop""# => "autoplay controls loop",
+                    _ => bail!("unsupported video syntax"),
+                };
+                if let Some(caption) = caption {
+                    self.write_caption_line(caption, level);
+                }
+                self.write_indent(level);
+                self.output.push_str(r#"<video src=""#);
+                self.output.push_str(url);
+                self.output.push_str(r#"" "#);
+                self.output.push_str(html_attrs);
+                self.output.push_str(">Your browser does not support the video tag.</video>\n");
+                return Ok(());
+            }
+        }
+        bail!("not a video block")
+    }
+
+    fn process_paragraph<P>(&mut self, level: usize, predicate: P) -> anyhow::Result<()>
+    where
+        P: Fn(&str) -> bool,
+    {
+        while let Some(line) = self.iter.peek() {
+            let line = line.as_deref().map_err(|e| anyhow!("{e}"))?;
+            if predicate(line) {
+                break;
+            }
+
+            self.write_indent(level);
+            let line = self.iter.next().unwrap()?;
+            let line = line.trim_start();
+            let line = process_inline_macros(line)?;
+            if let Some(stripped) = line.strip_suffix('+') {
+                self.output.push_str(stripped);
+                self.output.push('\\');
+            } else {
+                self.output.push_str(&line);
+            }
+            self.output.push('\n');
+        }
+
+        Ok(())
+    }
+
+    fn skip_blank_lines(&mut self) -> anyhow::Result<()> {
+        while let Some(line) = self.iter.peek() {
+            if !line.as_deref().unwrap().is_empty() {
+                break;
+            }
+            self.iter.next().unwrap()?;
+        }
+        Ok(())
+    }
+
+    fn write_title(&mut self, indent: usize, title: &str) {
+        for _ in 0..indent {
+            self.output.push('#');
+        }
+        self.output.push(' ');
+        self.output.push_str(title);
+        self.output.push('\n');
+    }
+
+    fn write_list_item(&mut self, item: &str, nesting: &ListNesting) {
+        let (marker, indent) = nesting.marker();
+        self.write_indent(indent);
+        self.output.push_str(marker);
+        self.output.push_str(item);
+        self.output.push('\n');
+    }
+
+    fn write_caption_line(&mut self, caption: &str, indent: usize) {
+        self.write_indent(indent);
+        self.output.push('_');
+        self.output.push_str(caption);
+        self.output.push_str("_\\\n");
+    }
+
+    fn write_indent(&mut self, indent: usize) {
+        for _ in 0..indent {
+            self.output.push(' ');
+        }
+    }
+
+    fn write_line(&mut self, line: &str, indent: usize) {
+        self.write_indent(indent);
+        self.output.push_str(line);
+        self.output.push('\n');
+    }
+}
+
+pub(crate) fn convert_asciidoc_to_markdown<R>(input: R) -> anyhow::Result<String>
+where
+    R: BufRead,
+{
+    let mut output = String::new();
+    let mut iter = input.lines().peekable();
+
+    let mut converter = Converter::new(&mut iter, &mut output);
+    converter.process()?;
+
+    Ok(output)
+}
+
+fn get_title(line: &str) -> Option<(usize, &str)> {
+    strip_prefix_symbol(line, '=')
+}
+
+fn get_list_item(line: &str) -> Option<(ListMarker, &str)> {
+    const HYPHEN_MARKER: &str = "- ";
+    if let Some(text) = line.strip_prefix(HYPHEN_MARKER) {
+        Some((ListMarker::Hyphen, text))
+    } else if let Some((count, text)) = strip_prefix_symbol(line, '*') {
+        Some((ListMarker::Asterisk(count), text))
+    } else if let Some((count, text)) = strip_prefix_symbol(line, '.') {
+        Some((ListMarker::Dot(count), text))
+    } else {
+        None
+    }
+}
+
+fn strip_prefix_symbol(line: &str, symbol: char) -> Option<(usize, &str)> {
+    let mut iter = line.chars();
+    if iter.next()? != symbol {
+        return None;
+    }
+    let mut count = 1;
+    loop {
+        match iter.next() {
+            Some(ch) if ch == symbol => {
+                count += 1;
+            }
+            Some(' ') => {
+                break;
+            }
+            _ => return None,
+        }
+    }
+    Some((count, iter.as_str()))
+}
+
+fn parse_media_block<'a>(line: &'a str, prefix: &str) -> Option<(&'a str, &'a str)> {
+    if let Some(line) = line.strip_prefix(prefix) {
+        if let Some((url, rest)) = line.split_once('[') {
+            if let Some(attrs) = rest.strip_suffix(']') {
+                return Some((url, attrs));
+            }
+        }
+    }
+    None
+}
+
+#[derive(Debug)]
+struct ListNesting(Vec<ListMarker>);
+
+impl ListNesting {
+    fn new() -> Self {
+        Self(Vec::<ListMarker>::with_capacity(6))
+    }
+
+    fn current(&mut self) -> Option<&ListMarker> {
+        self.0.last()
+    }
+
+    fn set_current(&mut self, marker: ListMarker) {
+        let Self(markers) = self;
+        if let Some(index) = markers.iter().position(|m| *m == marker) {
+            markers.truncate(index + 1);
+        } else {
+            markers.push(marker);
+        }
+    }
+
+    fn indent(&self) -> usize {
+        self.0.iter().map(|m| m.in_markdown().len()).sum()
+    }
+
+    fn marker(&self) -> (&str, usize) {
+        let Self(markers) = self;
+        let indent = markers.iter().take(markers.len() - 1).map(|m| m.in_markdown().len()).sum();
+        let marker = match markers.last() {
+            None => "",
+            Some(marker) => marker.in_markdown(),
+        };
+        (marker, indent)
+    }
+}
+
+#[derive(Debug, PartialEq, Eq)]
+enum ListMarker {
+    Asterisk(usize),
+    Hyphen,
+    Dot(usize),
+}
+
+impl ListMarker {
+    fn in_markdown(&self) -> &str {
+        match self {
+            ListMarker::Asterisk(_) => "- ",
+            ListMarker::Hyphen => "- ",
+            ListMarker::Dot(_) => "1. ",
+        }
+    }
+}
+
+fn process_inline_macros(line: &str) -> anyhow::Result<Cow<'_, str>> {
+    let mut chars = line.char_indices();
+    loop {
+        let (start, end, a_macro) = match get_next_line_component(&mut chars) {
+            Component::None => break,
+            Component::Text => continue,
+            Component::Macro(s, e, m) => (s, e, m),
+        };
+        let mut src = line.chars();
+        let mut processed = String::new();
+        for _ in 0..start {
+            processed.push(src.next().unwrap());
+        }
+        processed.push_str(a_macro.process()?.as_str());
+        for _ in start..end {
+            let _ = src.next().unwrap();
+        }
+        let mut pos = end;
+
+        loop {
+            let (start, end, a_macro) = match get_next_line_component(&mut chars) {
+                Component::None => break,
+                Component::Text => continue,
+                Component::Macro(s, e, m) => (s, e, m),
+            };
+            for _ in pos..start {
+                processed.push(src.next().unwrap());
+            }
+            processed.push_str(a_macro.process()?.as_str());
+            for _ in start..end {
+                let _ = src.next().unwrap();
+            }
+            pos = end;
+        }
+        for ch in src {
+            processed.push(ch);
+        }
+        return Ok(Cow::Owned(processed));
+    }
+    Ok(Cow::Borrowed(line))
+}
+
+fn get_next_line_component(chars: &mut std::str::CharIndices<'_>) -> Component {
+    let (start, mut macro_name) = match chars.next() {
+        None => return Component::None,
+        Some((_, ch)) if ch == ' ' || !ch.is_ascii() => return Component::Text,
+        Some((pos, ch)) => (pos, String::from(ch)),
+    };
+    loop {
+        match chars.next() {
+            None => return Component::None,
+            Some((_, ch)) if ch == ' ' || !ch.is_ascii() => return Component::Text,
+            Some((_, ':')) => break,
+            Some((_, ch)) => macro_name.push(ch),
+        }
+    }
+
+    let mut macro_target = String::new();
+    loop {
+        match chars.next() {
+            None => return Component::None,
+            Some((_, ' ')) => return Component::Text,
+            Some((_, '[')) => break,
+            Some((_, ch)) => macro_target.push(ch),
+        }
+    }
+
+    let mut attr_value = String::new();
+    let end = loop {
+        match chars.next() {
+            None => return Component::None,
+            Some((pos, ']')) => break pos + 1,
+            Some((_, ch)) => attr_value.push(ch),
+        }
+    };
+
+    Component::Macro(start, end, Macro::new(macro_name, macro_target, attr_value))
+}
+
+enum Component {
+    None,
+    Text,
+    Macro(usize, usize, Macro),
+}
+
+struct Macro {
+    name: String,
+    target: String,
+    attrs: String,
+}
+
+impl Macro {
+    fn new(name: String, target: String, attrs: String) -> Self {
+        Self { name, target, attrs }
+    }
+
+    fn process(&self) -> anyhow::Result<String> {
+        let name = &self.name;
+        let text = match name.as_str() {
+            "https" => {
+                let url = &self.target;
+                let anchor_text = &self.attrs;
+                format!("[{anchor_text}](https:{url})")
+            }
+            "image" => {
+                let url = &self.target;
+                let alt = &self.attrs;
+                format!("![{alt}]({url})")
+            }
+            "kbd" => {
+                let keys = self.attrs.split('+').map(|k| Cow::Owned(format!("<kbd>{k}</kbd>")));
+                keys.collect::<Vec<_>>().join("+")
+            }
+            "pr" => {
+                let pr = &self.target;
+                let url = format!("https://github.com/rust-analyzer/rust-analyzer/pull/{pr}");
+                format!("[`#{pr}`]({url})")
+            }
+            "commit" => {
+                let hash = &self.target;
+                let short = &hash[0..7];
+                let url = format!("https://github.com/rust-analyzer/rust-analyzer/commit/{hash}");
+                format!("[`{short}`]({url})")
+            }
+            "release" => {
+                let date = &self.target;
+                let url = format!("https://github.com/rust-analyzer/rust-analyzer/releases/{date}");
+                format!("[`{date}`]({url})")
+            }
+            _ => bail!("macro not supported: {name}"),
+        };
+        Ok(text)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::fs::read_to_string;
+
+    #[test]
+    fn test_asciidoc_to_markdown_conversion() {
+        let input = read_to_string("test_data/input.adoc").unwrap();
+        let expected = read_to_string("test_data/expected.md").unwrap();
+        let actual = convert_asciidoc_to_markdown(std::io::Cursor::new(&input)).unwrap();
+
+        assert_eq!(actual, expected);
+    }
+
+    macro_rules! test_inline_macro_processing {
+        ($((
+            $name:ident,
+            $input:expr,
+            $expected:expr
+        ),)*) => ($(
+            #[test]
+            fn $name() {
+                let input = $input;
+                let actual = process_inline_macros(&input).unwrap();
+                let expected = $expected;
+                assert_eq!(actual, expected)
+            }
+        )*);
+    }
+
+    test_inline_macro_processing! {
+        (inline_macro_processing_for_empty_line, "", ""),
+        (inline_macro_processing_for_line_with_no_macro, "foo bar", "foo bar"),
+        (
+            inline_macro_processing_for_macro_in_line_start,
+            "kbd::[Ctrl+T] foo",
+            "<kbd>Ctrl</kbd>+<kbd>T</kbd> foo"
+        ),
+        (
+            inline_macro_processing_for_macro_in_line_end,
+            "foo kbd::[Ctrl+T]",
+            "foo <kbd>Ctrl</kbd>+<kbd>T</kbd>"
+        ),
+        (
+            inline_macro_processing_for_macro_in_the_middle_of_line,
+            "foo kbd::[Ctrl+T] foo",
+            "foo <kbd>Ctrl</kbd>+<kbd>T</kbd> foo"
+        ),
+        (
+            inline_macro_processing_for_several_macros,
+            "foo kbd::[Ctrl+T] foo kbd::[Enter] foo",
+            "foo <kbd>Ctrl</kbd>+<kbd>T</kbd> foo <kbd>Enter</kbd> foo"
+        ),
+        (
+            inline_macro_processing_for_several_macros_without_text_in_between,
+            "foo kbd::[Ctrl+T]kbd::[Enter] foo",
+            "foo <kbd>Ctrl</kbd>+<kbd>T</kbd><kbd>Enter</kbd> foo"
+        ),
+    }
+}
diff --git a/xtask/src/release.rs b/xtask/src/release.rs
index eda8fceef0..4a30691477 100644
--- a/xtask/src/release.rs
+++ b/xtask/src/release.rs
@@ -64,8 +64,8 @@ impl flags::Release {
         let prev_tag = tags.lines().filter(|line| is_release_tag(line)).last().unwrap();
 
         let contents = changelog::get_changelog(sh, changelog_n, &commit, prev_tag, &today)?;
-        let path = changelog_dir.join(format!("{}-changelog-{}.adoc", today, changelog_n));
-        sh.write_file(&path, &contents)?;
+        let path = changelog_dir.join(format!("{today}-changelog-{changelog_n}.adoc"));
+        sh.write_file(path, contents)?;
 
         Ok(())
     }
diff --git a/xtask/src/release/changelog.rs b/xtask/src/release/changelog.rs
index 2647f7794f..d2a1483e38 100644
--- a/xtask/src/release/changelog.rs
+++ b/xtask/src/release/changelog.rs
@@ -23,9 +23,9 @@ pub(crate) fn get_changelog(
     let mut others = String::new();
     for line in git_log.lines() {
         let line = line.trim_start();
-        if let Some(pr_num) = parse_pr_number(&line) {
+        if let Some(pr_num) = parse_pr_number(line) {
             let accept = "Accept: application/vnd.github.v3+json";
-            let authorization = format!("Authorization: token {}", token);
+            let authorization = format!("Authorization: token {token}");
             let pr_url = "https://api.github.com/repos/rust-lang/rust-analyzer/issues";
 
             // we don't use an HTTPS client or JSON parser to keep the build times low
@@ -57,36 +57,36 @@ pub(crate) fn get_changelog(
                 PrKind::Other => &mut others,
                 PrKind::Skip => continue,
             };
-            writeln!(s, "* pr:{}[] {}", pr_num, l.message.as_deref().unwrap_or(&pr_title)).unwrap();
+            writeln!(s, "* pr:{pr_num}[] {}", l.message.as_deref().unwrap_or(&pr_title)).unwrap();
         }
     }
 
     let contents = format!(
         "\
-= Changelog #{}
+= Changelog #{changelog_n}
 :sectanchors:
+:experimental:
 :page-layout: post
 
-Commit: commit:{}[] +
-Release: release:{}[]
+Commit: commit:{commit}[] +
+Release: release:{today}[]
 
 == New Features
 
-{}
+{features}
 
 == Fixes
 
-{}
+{fixes}
 
 == Internal Improvements
 
-{}
+{internal}
 
 == Others
 
-{}
-",
-        changelog_n, commit, today, features, fixes, internal, others
+{others}
+"
     );
     Ok(contents)
 }
@@ -112,11 +112,9 @@ fn unescape(s: &str) -> String {
 fn parse_pr_number(s: &str) -> Option<u32> {
     const BORS_PREFIX: &str = "Merge #";
     const HOMU_PREFIX: &str = "Auto merge of #";
-    if s.starts_with(BORS_PREFIX) {
-        let s = &s[BORS_PREFIX.len()..];
+    if let Some(s) = s.strip_prefix(BORS_PREFIX) {
         s.parse().ok()
-    } else if s.starts_with(HOMU_PREFIX) {
-        let s = &s[HOMU_PREFIX.len()..];
+    } else if let Some(s) = s.strip_prefix(HOMU_PREFIX) {
         if let Some(space) = s.find(' ') {
             s[..space].parse().ok()
         } else {
diff --git a/xtask/test_data/expected.md b/xtask/test_data/expected.md
new file mode 100644
index 0000000000..19c940c67b
--- /dev/null
+++ b/xtask/test_data/expected.md
@@ -0,0 +1,81 @@
+# Changelog #256
+
+Hello!
+
+Commit: [`0123456`](https://github.com/rust-analyzer/rust-analyzer/commit/0123456789abcdef0123456789abcdef01234567) \
+Release: [`2022-01-01`](https://github.com/rust-analyzer/rust-analyzer/releases/2022-01-01)
+
+## New Features
+
+- **BREAKING** [`#1111`](https://github.com/rust-analyzer/rust-analyzer/pull/1111) shortcut <kbd>ctrl</kbd>+<kbd>r</kbd>
+  - hyphen-prefixed list item
+- nested list item
+  - `foo` -> `foofoo`
+  - `bar` -> `barbar`
+- listing in the secondary level
+  1. install
+  1. add to config
+
+     ```json
+     {"foo":"bar"}
+     ```
+- list item with continuation
+
+  ![](https://example.com/animation.gif)
+
+  ![alt text](https://example.com/animation.gif)
+
+  <video src="https://example.com/movie.mp4" controls loop>Your browser does not support the video tag.</video>
+
+  <video src="https://example.com/movie.mp4" autoplay controls loop>Your browser does not support the video tag.</video>
+
+  _Image_\
+  ![](https://example.com/animation.gif)
+
+  _Video_\
+  <video src="https://example.com/movie.mp4" controls loop>Your browser does not support the video tag.</video>
+
+  ```bash
+  rustup update nightly
+  ```
+
+  ```
+  This is a plain listing.
+  ```
+- single line item followed by empty lines
+- multiline list
+  item followed by empty lines
+- multiline list
+  item with indent
+- multiline list
+  item not followed by empty lines
+- multiline list
+  item followed by different marker
+  - foo
+  - bar
+- multiline list
+  item followed by list continuation
+
+  paragraph
+  paragraph
+
+## Another Section
+
+- foo bar baz
+- list item with an inline image
+  ![](https://example.com/animation.gif)
+
+The highlight of the month is probably [`#1111`](https://github.com/rust-analyzer/rust-analyzer/pull/1111).
+See [online manual](https://example.com/manual) for more information.
+
+```bash
+rustup update nightly
+```
+
+```
+rustup update nightly
+```
+
+```
+This is a plain listing.
+```
diff --git a/xtask/test_data/input.adoc b/xtask/test_data/input.adoc
new file mode 100644
index 0000000000..105bd8df0d
--- /dev/null
+++ b/xtask/test_data/input.adoc
@@ -0,0 +1,90 @@
+= Changelog #256
+:sectanchors:
+:page-layout: post
+
+Hello!
+
+Commit: commit:0123456789abcdef0123456789abcdef01234567[] +
+Release: release:2022-01-01[]
+
+== New Features
+
+* **BREAKING** pr:1111[] shortcut kbd:[ctrl+r]
+- hyphen-prefixed list item
+* nested list item
+** `foo` -> `foofoo`
+** `bar` -> `barbar`
+* listing in the secondary level
+. install
+. add to config
++
+[source,json]
+----
+{"foo":"bar"}
+----
+* list item with continuation
++
+image::https://example.com/animation.gif[]
++
+image::https://example.com/animation.gif["alt text"]
++
+video::https://example.com/movie.mp4[options=loop]
++
+video::https://example.com/movie.mp4[options="autoplay,loop"]
++
+.Image
+image::https://example.com/animation.gif[]
++
+.Video
+video::https://example.com/movie.mp4[options=loop]
++
+[source,bash]
+----
+rustup update nightly
+----
++
+----
+This is a plain listing.
+----
+* single line item followed by empty lines
+
+* multiline list
+item followed by empty lines
+
+* multiline list
+  item with indent
+
+* multiline list
+item not followed by empty lines
+* multiline list
+item followed by different marker
+** foo
+** bar
+* multiline list
+item followed by list continuation
++
+paragraph
+paragraph
+
+== Another Section
+
+* foo bar baz
+* list item with an inline image
+  image:https://example.com/animation.gif[]
+
+The highlight of the month is probably pr:1111[].
+See https://example.com/manual[online manual] for more information.
+
+[source,bash]
+----
+rustup update nightly
+----
+
+[source]
+----
+rustup update nightly
+----
+
+----
+This is a plain listing.
+----