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_middle/src/ty/structural_impls.rs
+++ b/compiler/rustc_middle/src/ty/structural_impls.rs
@@ -173,6 +173,7 @@ impl<'tcx> fmt::Debug for ty::PredicateKind<'tcx> {
            ty::PredicateKind::TypeWellFormedFromEnv(ty) => {
                write!(f, "TypeWellFormedFromEnv({:?})", ty)
            }
+            ty::PredicateKind::Ambiguous => write!(f, "Ambiguous"),
        }
    }
 }