Rustup to rust-lang/rust#59545

clippy_lints/src/utils/mod.rs

@@ -39,8 +39,8 @@ use rustc::ty::{
  subst::Kind,
  Binder, Ty, TyCtxt,
 };
-use rustc_data_structures::sync::Lrc;
 use rustc_errors::Applicability;
+use smallvec::SmallVec;
 use syntax::ast::{self, LitKind};
 use syntax::attr;
 use syntax::ext::hygiene::ExpnFormat;
@@ -248,7 +248,8 @@ pub fn path_to_res(cx: &LateContext<'_, '_>, path: &[&str]) -> Option<(def::Res)
  None => return None,
  };
 
- for item in mem::replace(&mut items, Lrc::new(vec![])).iter() {
+ let result = SmallVec::<[_; 8]>::new();
+ for item in mem::replace(&mut items, cx.tcx.arena.alloc_slice(&result)).iter() {
  if item.ident.name.as_str() == *segment {
  if path_it.peek().is_none() {
  return Some(item.res);

tests/ui/for_loop.stderr

@@ -66,83 +66,83 @@ error: it is more concise to loop over references to containers instead of using
  --> $DIR/for_loop.rs:107:15
  |
 LL | for _v in vec.iter() {}
- | ^^^^^^^^^^
+ | ^^^^^^^^^^ help: to write this more concisely, try: `&vec`
  |
  = note: `-D clippy::explicit-iter-loop` implied by `-D warnings`
 
 error: it is more concise to loop over references to containers instead of using explicit iteration methods
  --> $DIR/for_loop.rs:109:15
  |
 LL | for _v in vec.iter_mut() {}
- | ^^^^^^^^^^^^^^
+ | ^^^^^^^^^^^^^^ help: to write this more concisely, try: `&mut vec`
 
 error: it is more concise to loop over containers instead of using explicit iteration methods`
  --> $DIR/for_loop.rs:112:15
  |
 LL | for _v in out_vec.into_iter() {}
- | ^^^^^^^^^^^^^^^^^^^
+ | ^^^^^^^^^^^^^^^^^^^ help: to write this more concisely, try: `out_vec`
  |
  = note: `-D clippy::explicit-into-iter-loop` implied by `-D warnings`
 
 error: it is more concise to loop over references to containers instead of using explicit iteration methods
  --> $DIR/for_loop.rs:115:15
  |
 LL | for _v in array.into_iter() {}
- | ^^^^^^^^^^^^^^^^^
+ | ^^^^^^^^^^^^^^^^^ help: to write this more concisely, try: `&array`
 
 error: it is more concise to loop over references to containers instead of using explicit iteration methods
  --> $DIR/for_loop.rs:120:15
  |
 LL | for _v in [1, 2, 3].iter() {}
- | ^^^^^^^^^^^^^^^^
+ | ^^^^^^^^^^^^^^^^ help: to write this more concisely, try: `&[1, 2, 3]`
 
 error: it is more concise to loop over references to containers instead of using explicit iteration methods
  --> $DIR/for_loop.rs:124:15
  |
 LL | for _v in [0; 32].iter() {}
- | ^^^^^^^^^^^^^^
+ | ^^^^^^^^^^^^^^ help: to write this more concisely, try: `&[0; 32]`
 
 error: it is more concise to loop over references to containers instead of using explicit iteration methods
  --> $DIR/for_loop.rs:129:15
  |
 LL | for _v in ll.iter() {}
- | ^^^^^^^^^
+ | ^^^^^^^^^ help: to write this more concisely, try: `&ll`
 
 error: it is more concise to loop over references to containers instead of using explicit iteration methods
  --> $DIR/for_loop.rs:132:15
  |
 LL | for _v in vd.iter() {}
- | ^^^^^^^^^
+ | ^^^^^^^^^ help: to write this more concisely, try: `&vd`
 
 error: it is more concise to loop over references to containers instead of using explicit iteration methods
  --> $DIR/for_loop.rs:135:15
  |
 LL | for _v in bh.iter() {}
- | ^^^^^^^^^
+ | ^^^^^^^^^ help: to write this more concisely, try: `&bh`
 
 error: it is more concise to loop over references to containers instead of using explicit iteration methods
  --> $DIR/for_loop.rs:138:15
  |
 LL | for _v in hm.iter() {}
- | ^^^^^^^^^
+ | ^^^^^^^^^ help: to write this more concisely, try: `&hm`
 
 error: it is more concise to loop over references to containers instead of using explicit iteration methods
  --> $DIR/for_loop.rs:141:15
  |
 LL | for _v in bt.iter() {}
- | ^^^^^^^^^
+ | ^^^^^^^^^ help: to write this more concisely, try: `&bt`
 
 error: it is more concise to loop over references to containers instead of using explicit iteration methods
  --> $DIR/for_loop.rs:144:15
  |
 LL | for _v in hs.iter() {}
- | ^^^^^^^^^
+ | ^^^^^^^^^ help: to write this more concisely, try: `&hs`
 
 error: it is more concise to loop over references to containers instead of using explicit iteration methods
  --> $DIR/for_loop.rs:147:15
  |
 LL | for _v in bs.iter() {}
- | ^^^^^^^^^
+ | ^^^^^^^^^ help: to write this more concisely, try: `&bs`
 
 error: you are iterating over `Iterator::next()` which is an Option; this will compile but is probably not what you want
  --> $DIR/for_loop.rs:149:15