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Fix for the supertrait example in #43784

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This commit is contained in:
scalexm 2017-08-10 14:41:24 +02:00
parent c2de81f4c9
commit 1ebc7eff46
1 changed files with 11 additions and 0 deletions
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11
src/librustc/ty/wf.rs
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@ -141,6 +141,17 @@ impl<'a, 'gcx, 'tcx> WfPredicates<'a, 'gcx, 'tcx> {
let cause = self.cause(traits::MiscObligation);
let param_env = self.param_env;
let implied_obligations = traits::elaborate_predicates(self.infcx.tcx, vec![
ty::Predicate::Trait(ty::Binder(
ty::TraitPredicate { trait_ref: *trait_ref }
))
]);
let implied_obligations = implied_obligations.map(|pred| {
traits::Obligation::new(cause.clone(), param_env, pred)
});
self.out.extend(implied_obligations);
self.out.extend(
trait_ref.substs.types()
.filter(|ty| !ty.has_escaping_regions())