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Elaborate trait obligations when typechecking impls

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Fixes #43784.
This commit is contained in:
scalexm 2017-08-10 15:02:41 +02:00
parent 1ebc7eff46
commit 488dccbe87
1 changed files with 6 additions and 7 deletions
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13
src/librustc/ty/wf.rs
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@ -137,20 +137,19 @@ impl<'a, 'gcx, 'tcx> WfPredicates<'a, 'gcx, 'tcx> {
/// `self.out`.
fn compute_trait_ref(&mut self, trait_ref: &ty::TraitRef<'tcx>) {
let obligations = self.nominal_obligations(trait_ref.def_id, trait_ref.substs);
self.out.extend(obligations);
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 predicates = obligations.iter()
.map(|obligation| obligation.predicate.clone())
.collect();
let implied_obligations = traits::elaborate_predicates(self.infcx.tcx, predicates);
let implied_obligations = implied_obligations.map(|pred| {
traits::Obligation::new(cause.clone(), param_env, pred)
});
self.out.extend(implied_obligations);
self.out.extend(implied_obligations.chain(obligations));
self.out.extend(
trait_ref.substs.types()