Merge #10617

10617: Set MSRV r=Veykril a=lnicola

Set the MSRV to `1.56` since we're already on the 2021 edition and building with older version fails.

From now on, there'll be a change in behavior: `xtask install` used to warn on old toolchains, but now the user will get an error. This isn't so bad because:

 - the check in `xtask install` wasn't always working (because sometimes `xtask` itself required a newer toolchain)
 - we generally bump the required version for a reason (when using a newer feature). We might forget to bump it, but when we do, older toolchains won't work

Co-authored-by: Laurențiu Nicola <lnicola@dend.ro>

crates/base_db/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.0.0"
 description = "TBD"
 license = "MIT OR Apache-2.0"
 edition = "2021"
+rust-version = "1.56"
 
 [lib]
 doctest = false

crates/cfg/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.0.0"
 description = "TBD"
 license = "MIT OR Apache-2.0"
 edition = "2021"
+rust-version = "1.56"
 
 [lib]
 doctest = false

crates/flycheck/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.0.0"
 description = "TBD"
 license = "MIT OR Apache-2.0"
 edition = "2021"
+rust-version = "1.56"
 
 [lib]
 doctest = false

crates/hir/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.0.0"
 description = "TBD"
 license = "MIT OR Apache-2.0"
 edition = "2021"
+rust-version = "1.56"
 
 [lib]
 doctest = false

crates/hir_def/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.0.0"
 description = "TBD"
 license = "MIT OR Apache-2.0"
 edition = "2021"
+rust-version = "1.56"
 
 [lib]
 doctest = false

crates/hir_expand/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.0.0"
 description = "TBD"
 license = "MIT OR Apache-2.0"
 edition = "2021"
+rust-version = "1.56"
 
 [lib]
 doctest = false

crates/hir_ty/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.0.0"
 description = "TBD"
 license = "MIT OR Apache-2.0"
 edition = "2021"
+rust-version = "1.56"
 
 [lib]
 doctest = false

crates/ide/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.0.0"
 description = "TBD"
 license = "MIT OR Apache-2.0"
 edition = "2021"
+rust-version = "1.56"
 
 [lib]
 doctest = false

crates/ide_assists/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.0.0"
 description = "TBD"
 license = "MIT OR Apache-2.0"
 edition = "2021"
+rust-version = "1.56"
 
 [lib]
 doctest = false

crates/ide_completion/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.0.0"
 description = "TBD"
 license = "MIT OR Apache-2.0"
 edition = "2021"
+rust-version = "1.56"
 
 [lib]
 doctest = false

crates/ide_db/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.0.0"
 description = "TBD"
 license = "MIT OR Apache-2.0"
 edition = "2021"
+rust-version = "1.56"
 
 [lib]
 doctest = false

crates/ide_diagnostics/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.0.0"
 description = "TBD"
 license = "MIT OR Apache-2.0"
 edition = "2021"
+rust-version = "1.56"
 
 [lib]
 doctest = false

crates/ide_ssr/Cargo.toml

@@ -5,6 +5,7 @@ description = "Structural search and replace of Rust code"
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/rust-analyzer/rust-analyzer"
 edition = "2021"
+rust-version = "1.56"
 
 [lib]
 doctest = false

crates/limit/Cargo.toml

@@ -5,6 +5,7 @@ description = "TBD"
 license = "MIT OR Apache-2.0"
 authors = ["rust-analyzer developers"]
 edition = "2021"
+rust-version = "1.56"
 
 [features]
 tracking = []

crates/mbe/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.0.0"
 description = "TBD"
 license = "MIT OR Apache-2.0"
 edition = "2021"
+rust-version = "1.56"
 
 [lib]
 doctest = false

crates/parser/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.0.0"
 description = "TBD"
 license = "MIT OR Apache-2.0"
 edition = "2021"
+rust-version = "1.56"
 
 [lib]
 doctest = false

crates/paths/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.0.0"
 description = "TBD"
 license = "MIT OR Apache-2.0"
 edition = "2021"
+rust-version = "1.56"
 
 [lib]
 doctest = false

crates/proc_macro_api/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.0.0"
 description = "TBD"
 license = "MIT OR Apache-2.0"
 edition = "2021"
+rust-version = "1.56"
 
 [lib]
 doctest = false

crates/proc_macro_srv/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.0.0"
 description = "TBD"
 license = "MIT OR Apache-2.0"
 edition = "2021"
+rust-version = "1.56"
 
 [lib]
 doctest = false

crates/proc_macro_test/Cargo.toml

@@ -3,6 +3,7 @@ name = "proc_macro_test"
 version = "0.0.0"
 license = "MIT OR Apache-2.0"
 edition = "2021"
+rust-version = "1.56"
 publish = false
 
 [lib]

crates/proc_macro_test/imp/Cargo.toml

@@ -3,6 +3,7 @@ name = "proc_macro_test_impl"
 version = "0.0.0"
 license = "MIT OR Apache-2.0"
 edition = "2021"
+rust-version = "1.56"
 publish = false
 
 [lib]

crates/profile/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.0.0"
 description = "TBD"
 license = "MIT OR Apache-2.0"
 edition = "2021"
+rust-version = "1.56"
 
 [lib]
 doctest = false

crates/project_model/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.0.0"
 description = "TBD"
 license = "MIT OR Apache-2.0"
 edition = "2021"
+rust-version = "1.56"
 
 [lib]
 doctest = false

crates/rust-analyzer/Cargo.toml

@@ -8,6 +8,7 @@ documentation = "https://rust-analyzer.github.io/manual.html"
 license = "MIT OR Apache-2.0"
 autobins = false
 edition = "2021"
+rust-version = "1.56"
 
 [lib]
 doctest = false

crates/sourcegen/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.0.0"
 description = "TBD"
 license = "MIT OR Apache-2.0"
 edition = "2021"
+rust-version = "1.56"
 
 [lib]
 doctest = false

crates/stdx/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.0.0"
 description = "TBD"
 license = "MIT OR Apache-2.0"
 edition = "2021"
+rust-version = "1.56"
 
 [lib]
 doctest = false

crates/syntax/Cargo.toml

@@ -5,6 +5,7 @@ description = "Comment and whitespace preserving parser for the Rust language"
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/rust-analyzer/rust-analyzer"
 edition = "2021"
+rust-version = "1.56"
 
 [lib]
 doctest = false

crates/syntax/fuzz/Cargo.toml

@@ -4,6 +4,7 @@ name = "syntax-fuzz"
 version = "0.0.1"
 publish = false
 edition = "2021"
+rust-version = "1.56"
 
 [package.metadata]
 cargo-fuzz = true

crates/test_utils/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.0.0"
 description = "TBD"
 license = "MIT OR Apache-2.0"
 edition = "2021"
+rust-version = "1.56"
 
 [lib]
 doctest = false

crates/text_edit/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.0.0"
 description = "TBD"
 license = "MIT OR Apache-2.0"
 edition = "2021"
+rust-version = "1.56"
 
 [lib]
 doctest = false

crates/toolchain/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.0.0"
 description = "TBD"
 license = "MIT OR Apache-2.0"
 edition = "2021"
+rust-version = "1.56"
 
 [lib]
 doctest = false

crates/tt/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.0.0"
 description = "TBD"
 license = "MIT OR Apache-2.0"
 edition = "2021"
+rust-version = "1.56"
 
 [lib]
 doctest = false

crates/vfs-notify/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.0.0"
 description = "TBD"
 license = "MIT OR Apache-2.0"
 edition = "2021"
+rust-version = "1.56"
 
 [lib]
 doctest = false

crates/vfs/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.0.0"
 description = "TBD"
 license = "MIT OR Apache-2.0"
 edition = "2021"
+rust-version = "1.56"
 
 [lib]
 doctest = false

lib/arena/Cargo.toml

@@ -7,3 +7,4 @@ repository = "https://github.com/rust-analyzer/rust-analyzer"
 documentation = "https://docs.rs/la-arena"
 categories = ["data-structures", "memory-management", "rust-patterns"]
 edition = "2021"
+rust-version = "1.56"

xtask/Cargo.toml

@@ -1,9 +1,10 @@
 [package]
-edition = "2021"
 name = "xtask"
 version = "0.1.0"
 publish = false
 license = "MIT OR Apache-2.0"
+edition = "2021"
+rust-version = "1.56"
 
 [dependencies]
 anyhow = "1.0.26"

xtask/src/install.rs

@@ -7,9 +7,6 @@ use xshell::{cmd, pushd};
 
 use crate::flags;
 
-// Latest stable, feel free to send a PR if this lags behind.
-const REQUIRED_RUST_VERSION: u32 = 56;
-
 impl flags::Install {
     pub(crate) fn run(self) -> Result<()> {
         if cfg!(target_os = "macos") {
@@ -137,19 +134,6 @@ fn install_client(client_opt: ClientOpt) -> Result<()> {
 }
 
 fn install_server(opts: ServerOpt) -> Result<()> {
-    let mut old_rust = false;
-    if let Ok(stdout) = cmd!("cargo --version").read() {
-        if !check_version(&stdout, REQUIRED_RUST_VERSION) {
-            old_rust = true;
-        }
-    }
-
-    if old_rust {
-        eprintln!(
-            "\nWARNING: at least rust 1.{}.0 is required to compile rust-analyzer\n",
-            REQUIRED_RUST_VERSION,
-        );
-    }
     let features = match opts.malloc {
         Malloc::System => &[][..],
         Malloc::Mimalloc => &["--features", "mimalloc"],
@@ -157,25 +141,6 @@ fn install_server(opts: ServerOpt) -> Result<()> {
     };
 
     let cmd = cmd!("cargo install --path crates/rust-analyzer --locked --force --features force-always-assert {features...}");
-    let res = cmd.run();
-
-    if res.is_err() && old_rust {
-        eprintln!(
-            "\nWARNING: at least rust 1.{}.0 is required to compile rust-analyzer\n",
-            REQUIRED_RUST_VERSION,
-        );
-    }
-
-    res?;
+    cmd.run()?;
     Ok(())
 }
-
-fn check_version(version_output: &str, min_minor_version: u32) -> bool {
-    // Parse second the number out of
-    //      cargo 1.39.0-beta (1c6ec66d5 2019-09-30)
-    let minor: Option<u32> = version_output.split('.').nth(1).and_then(|it| it.parse().ok());
-    match minor {
-        None => true,
-        Some(minor) => minor >= min_minor_version,
-    }
-}