avoid temporary vectors

Avoid collecting an interator just to re-iterate immediately.
Rather reuse the previous iterator. (clippy::needless_collect)

1 files changed, 2 insertions, 2 deletions

diff --git a/compiler/rustc_infer/src/infer/error_reporting/mod.rs b/compiler/rustc_infer/src/infer/error_reporting/mod.rs
index e3a79fe2653..a5a804a2916 100644
--- a/compiler/rustc_infer/src/infer/error_reporting/mod.rs
+++ b/compiler/rustc_infer/src/infer/error_reporting/mod.rs
@@ -2134,7 +2134,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
         let new_lt = generics
             .as_ref()
             .and_then(|(parent_g, g)| {
-                let possible: Vec<_> = (b'a'..=b'z').map(|c| format!("'{}", c as char)).collect();
+                let mut possible = (b'a'..=b'z').map(|c| format!("'{}", c as char));
                 let mut lts_names = g
                     .params
                     .iter()
@@ -2150,7 +2150,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
                     );
                 }
                 let lts = lts_names.iter().map(|s| -> &str { &*s }).collect::<Vec<_>>();
-                possible.into_iter().find(|candidate| !lts.contains(&candidate.as_str()))
+                possible.find(|candidate| !lts.contains(&candidate.as_str()))
             })
             .unwrap_or("'lt".to_string());
         let add_lt_sugg = generics