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Add an always-ambiguous predicate to make sure that we don't accidentlally allow trait resolution to prove false things during coherence

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This commit is contained in:
Oli Scherer
2022-11-02 15:10:05 +00:00
parent 94fe30ff2f
commit ae80c764d4
35 changed files with 102 additions and 17 deletions
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2
compiler/rustc_trait_selection/src/traits/wf.rs
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@@ -155,6 +155,7 @@ pub fn predicate_obligations<'tcx>(
wf.compute(c1.into());
wf.compute(c2.into());
}
ty::PredicateKind::Ambiguous => {}
ty::PredicateKind::TypeWellFormedFromEnv(..) => {
bug!("TypeWellFormedFromEnv is only used for Chalk")
}
@@ -878,6 +879,7 @@ pub(crate) fn required_region_bounds<'tcx>(
| ty::PredicateKind::RegionOutlives(..)
| ty::PredicateKind::ConstEvaluatable(..)
| ty::PredicateKind::ConstEquate(..)
| ty::PredicateKind::Ambiguous
| ty::PredicateKind::TypeWellFormedFromEnv(..) => None,
ty::PredicateKind::TypeOutlives(ty::OutlivesPredicate(ref t, ref r)) => {
// Search for a bound of the form `erased_self_ty