1 files changed, 9 insertions, 2 deletions
diff --git a/compiler/rustc_middle/src/ty/context.rs b/compiler/rustc_middle/src/ty/context.rs
index bd86c1c284e..61e449b8b56 100644
--- a/compiler/rustc_middle/src/ty/context.rs
+++ b/compiler/rustc_middle/src/ty/context.rs
@@ -28,7 +28,7 @@ use crate::ty::{
     self, AdtDef, AdtDefData, AdtKind, Binder, Clause, Const, ConstData, GenericParamDefKind,
     ImplPolarity, List, ParamConst, ParamTy, PolyExistentialPredicate, PolyFnSig, Predicate,
     PredicateKind, Region, RegionKind, ReprOptions, TraitObjectVisitor, Ty, TyKind, TyVid,
-    Visibility,
+    TypeVisitable, Visibility,
 };
 use crate::ty::{GenericArg, GenericArgs, GenericArgsRef};
 use rustc_ast::{self as ast, attr};
@@ -87,7 +87,9 @@ impl<'tcx> Interner for TyCtxt<'tcx> {
     type GenericArg = ty::GenericArg<'tcx>;
     type Term = ty::Term<'tcx>;
 
-    type Binder<T> = Binder<'tcx, T>;
+    type Binder<T: TypeVisitable<TyCtxt<'tcx>>> = Binder<'tcx, T>;
+    type BoundVars = &'tcx List<ty::BoundVariableKind>;
+    type BoundVar = ty::BoundVariableKind;
     type CanonicalVars = CanonicalVarInfos<'tcx>;
 
     type Ty = Ty<'tcx>;
@@ -151,6 +153,11 @@ impl<'tcx> Interner for TyCtxt<'tcx> {
     ) -> Self::Const {
         Const::new_bound(self, debruijn, var, ty)
     }
+
+    fn expect_error_or_delayed_bug() {
+        let has_errors = ty::tls::with(|tcx| tcx.dcx().has_errors_or_lint_errors_or_delayed_bugs());
+        assert!(has_errors.is_some());
+    }
 }
 
 type InternedSet<'tcx, T> = ShardedHashMap<InternedInSet<'tcx, T>, ()>;