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Use a consistent way to filter out bounds instead of splitting it into three places #126471

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Merged
merged 1 commit into from
Jun 15, 2024
Merged

Use a consistent way to filter out bounds instead of splitting it into three places #126471

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17 changes: 6 additions & 11 deletions compiler/rustc_trait_selection/src/traits/select/candidate_assembly.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -239,24 +239,19 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
return Ok(());
}

let all_bounds = stack
let bounds = stack
.obligation
.param_env
.caller_bounds()
.iter()
.filter(|p| !p.references_error())
.filter_map(|p| p.as_trait_clause());

// Micro-optimization: filter out predicates relating to different traits.
let matching_bounds =
all_bounds.filter(|p| p.def_id() == stack.obligation.predicate.def_id());
.filter_map(|p| p.as_trait_clause())
// Micro-optimization: filter out predicates relating to different traits.
.filter(|p| p.def_id() == stack.obligation.predicate.def_id())
.filter(|p| p.polarity() == stack.obligation.predicate.polarity());

// Keep only those bounds which may apply, and propagate overflow if it occurs.
for bound in matching_bounds {
if bound.skip_binder().polarity != stack.obligation.predicate.skip_binder().polarity {
continue;
}

for bound in bounds {
// FIXME(oli-obk): it is suspicious that we are dropping the constness and
// polarity here.
let wc = self.where_clause_may_apply(stack, bound.map_bound(|t| t.trait_ref))?;
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