Use array IntoIter

crates/base_db/src/fixture.rs

@@ -283,7 +283,7 @@ pub fn mirror(input: TokenStream) -> TokenStream {
     input
 }
 "#;
-    let proc_macros = std::array::IntoIter::new([
+    let proc_macros = [
         ProcMacro {
             name: "identity".into(),
             kind: crate::ProcMacroKind::Attr,
@@ -304,7 +304,8 @@ pub fn mirror(input: TokenStream) -> TokenStream {
             kind: crate::ProcMacroKind::FuncLike,
             expander: Arc::new(MirrorProcMacroExpander),
         },
-    ])
+    ]
+    .into_iter()
     .filter(|pm| proc_macros.iter().any(|name| name == pm.name))
     .collect();
     (proc_macros, source.into())

crates/hir/src/lib.rs

@@ -2392,7 +2392,7 @@ impl Type {
                 }
                 .cast(&Interner),
             ),
-            [TyVariableKind::General].iter().copied(),
+            [TyVariableKind::General].into_iter(),
         );
 
         match db.trait_solve(self.krate, goal)? {

crates/hir_def/src/nameres/collector.rs

@@ -507,12 +507,12 @@ impl DefCollector<'_> {
         };
         let path = ModPath::from_segments(
             path_kind.clone(),
-            [krate.clone(), name![prelude], edition].iter().cloned(),
+            [krate.clone(), name![prelude], edition].into_iter(),
         );
         // Fall back to the older `std::prelude::v1` for compatibility with Rust <1.52.0
         // FIXME remove this fallback
         let fallback_path =
-            ModPath::from_segments(path_kind, [krate, name![prelude], name![v1]].iter().cloned());
+            ModPath::from_segments(path_kind, [krate, name![prelude], name![v1]].into_iter());
 
         for path in &[path, fallback_path] {
             let (per_ns, _) = self.def_map.resolve_path(

crates/hir_ty/src/utils.rs

@@ -1,7 +1,7 @@
 //! Helper functions for working with def, which don't need to be a separate
 //! query, but can't be computed directly from `*Data` (ie, which need a `db`).
 
-use std::{array, iter};
+use std::iter;
 
 use base_db::CrateId;
 use chalk_ir::{fold::Shift, BoundVar, DebruijnIndex};
@@ -25,12 +25,14 @@ use crate::{
 };
 
 pub(crate) fn fn_traits(db: &dyn DefDatabase, krate: CrateId) -> impl Iterator<Item = TraitId> {
-    let fn_traits = [
+    [
         db.lang_item(krate, "fn".into()),
         db.lang_item(krate, "fn_mut".into()),
         db.lang_item(krate, "fn_once".into()),
-    ];
+    ]
-    array::IntoIter::new(fn_traits).into_iter().flatten().flat_map(|it| it.as_trait())
+    .into_iter()
+    .flatten()
+    .flat_map(|it| it.as_trait())
 }
 
 fn direct_super_traits(db: &dyn DefDatabase, trait_: TraitId) -> Vec<TraitId> {

crates/ide_assists/src/handlers/replace_try_expr_with_match.rs

@@ -76,8 +76,7 @@ pub(crate) fn replace_try_expr_with_match(acc: &mut Assists, ctx: &AssistContext
             );
             let sad_arm = make::match_arm(iter::once(sad_pat), None, sad_expr);
 
-            let match_arms = [happy_arm, sad_arm];
+            let match_arm_list = make::match_arm_list([happy_arm, sad_arm]);
-            let match_arm_list = make::match_arm_list(std::array::IntoIter::new(match_arms));
 
             let expr_match = make::expr_match(expr, match_arm_list)
                 .indent(IndentLevel::from_node(qm_kw_parent.syntax()));

crates/ide_assists/src/utils.rs

@@ -268,7 +268,7 @@ fn invert_special_case(expr: &ast::Expr) -> Option<ast::Expr> {
 }
 
 pub(crate) fn next_prev() -> impl Iterator<Item = Direction> {
-    [Direction::Next, Direction::Prev].iter().copied()
+    [Direction::Next, Direction::Prev].into_iter()
 }
 
 pub(crate) fn does_pat_match_variant(pat: &ast::Pat, var: &ast::Pat) -> bool {

crates/ide_completion/src/completions/attribute.rs

@@ -177,7 +177,7 @@ macro_rules! attrs {
 #[rustfmt::skip]
 static KIND_TO_ATTRIBUTES: Lazy<FxHashMap<SyntaxKind, &[&str]>> = Lazy::new(|| {
     use SyntaxKind::*;
-    std::array::IntoIter::new([
+    [
         (
             SOURCE_FILE,
             attrs!(
@@ -229,7 +229,8 @@ static KIND_TO_ATTRIBUTES: Lazy<FxHashMap<SyntaxKind, &[&str]>> = Lazy::new(|| {
         (MATCH_ARM, attrs!()),
         (IDENT_PAT, attrs!()),
         (RECORD_PAT_FIELD, attrs!()),
-    ])
+    ]
+    .into_iter()
     .collect()
 });
 const EXPR_ATTRIBUTES: &[&str] = attrs!();

crates/ide_completion/src/completions/attribute/cfg.rs

@@ -10,9 +10,9 @@ use crate::{
 };
 
 pub(crate) fn complete_cfg(acc: &mut Completions, ctx: &CompletionContext) {
-    let add_completion = |item: &&str| {
+    let add_completion = |item: &str| {
         let mut completion =
-            CompletionItem::new(CompletionKind::Attribute, ctx.source_range(), *item);
+            CompletionItem::new(CompletionKind::Attribute, ctx.source_range(), item);
         completion.insert_text(format!(r#""{}""#, item));
         completion.kind(CompletionItemKind::Attribute);
         acc.add(completion.build());
@@ -26,11 +26,11 @@ pub(crate) fn complete_cfg(acc: &mut Completions, ctx: &CompletionContext) {
     .find(|t| matches!(t.kind(), SyntaxKind::IDENT));
 
     match previous.as_ref().map(|p| p.text()) {
-        Some("target_arch") => KNOWN_ARCH.iter().for_each(add_completion),
+        Some("target_arch") => KNOWN_ARCH.iter().copied().for_each(add_completion),
-        Some("target_env") => KNOWN_ENV.iter().for_each(add_completion),
+        Some("target_env") => KNOWN_ENV.iter().copied().for_each(add_completion),
-        Some("target_os") => KNOWN_OS.iter().for_each(add_completion),
+        Some("target_os") => KNOWN_OS.iter().copied().for_each(add_completion),
-        Some("target_vendor") => KNOWN_VENDOR.iter().for_each(add_completion),
+        Some("target_vendor") => KNOWN_VENDOR.iter().copied().for_each(add_completion),
-        Some("target_endian") => ["little", "big"].iter().for_each(add_completion),
+        Some("target_endian") => ["little", "big"].into_iter().for_each(add_completion),
         Some(name) => {
             if let Some(krate) = ctx.krate {
                 krate.potential_cfg(ctx.db).get_cfg_values(&name).iter().for_each(|s| {

crates/ide_completion/src/completions/unqualified_path.rs

@@ -19,11 +19,10 @@ pub(crate) fn complete_unqualified_path(acc: &mut Completions, ctx: &CompletionC
             }
         });
 
-        std::array::IntoIter::new(["self::", "super::", "crate::"])
+        ["self::", "super::", "crate::"].into_iter().for_each(|kw| acc.add_keyword(ctx, kw));
-            .for_each(|kw| acc.add_keyword(ctx, kw));
         return;
     }
-    std::array::IntoIter::new(["self", "super", "crate"]).for_each(|kw| acc.add_keyword(ctx, kw));
+    ["self", "super", "crate"].into_iter().for_each(|kw| acc.add_keyword(ctx, kw));
 
     match &ctx.completion_location {
         Some(ImmediateLocation::Visibility(_)) => return,

crates/proc_macro_srv/src/abis/abi_1_56/proc_macro/quote.rs

@@ -28,8 +28,7 @@ macro_rules! quote_ts {
         [
             TokenTree::from(Punct::new(':', Spacing::Joint)),
             TokenTree::from(Punct::new(':', Spacing::Alone)),
-        ].iter()
+        ].into_iter()
-            .cloned()
             .map(|mut x| {
                 x.set_span(Span::def_site());
                 x
@@ -52,7 +51,7 @@ macro_rules! quote {
     ($($t:tt)*) => {
         [
             $(TokenStream::from(quote_ts!($t)),)*
-        ].iter().cloned().collect::<TokenStream>()
+        ].into_iter().collect::<TokenStream>()
     };
 }
 

crates/project_model/src/rustc_cfg.rs

@@ -12,8 +12,8 @@ pub(crate) fn get(cargo_toml: Option<&ManifestPath>, target: Option<&str>) -> Ve
 
     // Some nightly-only cfgs, which are required for stdlib
     res.push(CfgFlag::Atom("target_thread_local".into()));
-    for &ty in ["8", "16", "32", "64", "cas", "ptr"].iter() {
+    for ty in ["8", "16", "32", "64", "cas", "ptr"] {
-        for &key in ["target_has_atomic", "target_has_atomic_load_store"].iter() {
+        for key in ["target_has_atomic", "target_has_atomic_load_store"] {
             res.push(CfgFlag::KeyValue { key: key.to_string(), value: ty.into() });
         }
     }

crates/rust-analyzer/src/handlers.rs

@@ -706,7 +706,7 @@ pub(crate) fn handle_runnables(
     let config = snap.config.runnables();
     match cargo_spec {
         Some(spec) => {
-            for &cmd in ["check", "test"].iter() {
+            for cmd in ["check", "test"] {
                 res.push(lsp_ext::Runnable {
                     label: format!("cargo {} -p {} --all-targets", cmd, spec.package),
                     location: None,

crates/rust-analyzer/tests/slow-tests/sourcegen.rs

@@ -56,12 +56,12 @@ impl Feature {
 
 fn is_valid_feature_name(feature: &str) -> Result<(), String> {
     'word: for word in feature.split_whitespace() {
-        for &short in ["to", "and"].iter() {
+        for short in ["to", "and"] {
             if word == short {
                 continue 'word;
             }
         }
-        for &short in ["To", "And"].iter() {
+        for short in ["To", "And"] {
             if word == short {
                 return Err(format!("Don't capitalize {:?}", word));
             }