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

2022-11-02 15:10:05 +00:00
parent 94fe30ff2f
commit ae80c764d4
35 changed files with 102 additions and 17 deletions
--- a/compiler/rustc_trait_selection/src/traits/auto_trait.rs
+++ b/compiler/rustc_trait_selection/src/traits/auto_trait.rs
@@ -843,6 +843,7 @@ impl<'tcx> AutoTraitFinder<'tcx> {
                | ty::PredicateKind::ConstEvaluatable(..)
                | ty::PredicateKind::Coerce(..)
                | ty::PredicateKind::TypeWellFormedFromEnv(..) => {}
+                ty::PredicateKind::Ambiguous => return false,
            };
        }
        true