Push to result vector instead of allocating

Co-authored-by: lcnr <bastian_kauschke@hotmail.de>

1 files changed, 1 insertions, 4 deletions

diff --git a/compiler/rustc_trait_selection/src/traits/select/candidate_assembly.rs b/compiler/rustc_trait_selection/src/traits/select/candidate_assembly.rs
index b0bfb4ad173..ea18a689065 100644
--- a/compiler/rustc_trait_selection/src/traits/select/candidate_assembly.rs
+++ b/compiler/rustc_trait_selection/src/traits/select/candidate_assembly.rs
@@ -353,16 +353,13 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
             all_bounds.filter(|p| p.def_id() == stack.obligation.predicate.def_id());
 
         // Keep only those bounds which may apply, and propagate overflow if it occurs.
-        let mut param_candidates = vec![];
         for bound in matching_bounds {
             let wc = self.evaluate_where_clause(stack, bound)?;
             if wc.may_apply() {
-                param_candidates.push(ParamCandidate(bound));
+                candidates.vec.push(ParamCandidate(bound));
             }
         }
 
-        candidates.vec.extend(param_candidates);
-
         Ok(())
     }