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Fix duplicate bounds for const_trait_impl

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Deadbeef 2021-09-11 09:40:19 +00:00
parent 497ee321af
commit a0b83f542f
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2 changed files with 12 additions and 6 deletions
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5
compiler/rustc_trait_selection/src/traits/select/mod.rs
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@ -1487,10 +1487,11 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
) => false,
(ParamCandidate(other), ParamCandidate(victim)) => {
let value_same_except_bound_vars = other.value.skip_binder()
let same_except_bound_vars = other.value.skip_binder()
== victim.value.skip_binder()
&& other.constness == victim.constness
&& !other.value.skip_binder().has_escaping_bound_vars();
if value_same_except_bound_vars {
if same_except_bound_vars {
// See issue #84398. In short, we can generate multiple ParamCandidates which are
// the same except for unused bound vars. Just pick the one with the fewest bound vars
// or the current one if tied (they should both evaluate to the same answer). This is