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traits::select: quickly filter out predicates from other traits #41486

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Merged
bors merged 1 commit into from
Apr 24, 2017
Merged

traits::select: quickly filter out predicates from other traits #41486

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7 changes: 6 additions & 1 deletion src/librustc/traits/select.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1300,8 +1300,13 @@ impl<'cx, 'gcx, 'tcx> SelectionContext<'cx, 'gcx, 'tcx> {
.iter()
.filter_map(|o| o.to_opt_poly_trait_ref());

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

let matching_bounds =
matching_bounds.filter(
|bound| self.evaluate_where_clause(stack, bound.clone()).may_apply());

let param_candidates =
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