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evaluate_added_goals_step improve using capacity #158254

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evaluate_added_goals_step improve using capacity #158254

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3 changes: 2 additions & 1 deletion compiler/rustc_next_trait_solver/src/solve/eval_ctxt/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1001,7 +1001,8 @@ where
) -> Result<Option<Certainty>, NoSolutionOrRerunNonErased> {
// If this loop did not result in any progress, what's our final certainty.
let mut unchanged_certainty = Some(Certainty::Yes);
for (source, goal, stalled_on) in mem::take(&mut self.nested_goals) {
let new_nested_goals = Vec::with_capacity(self.nested_goals.len());
for (source, goal, stalled_on) in mem::replace(&mut self.nested_goals, new_nested_goals) {
// We never handle `NormalizesTo` as a nested goal
debug_assert!(!matches!(
goal.predicate.kind().skip_binder(),
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