Remove dead expect_error_or_delayed_bug method.

Author: nnethercote

Diff for: compiler/rustc_middle/src/ty/context.rs

@@ -153,11 +153,6 @@ 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>, ()>;

Diff for: compiler/rustc_type_ir/src/interner.rs

@@ -95,9 +95,6 @@ pub trait Interner: Sized {
     fn mk_bound_ty(self, debruijn: DebruijnIndex, var: BoundVar) -> Self::Ty;
     fn mk_bound_region(self, debruijn: DebruijnIndex, var: BoundVar) -> Self::Region;
     fn mk_bound_const(self, debruijn: DebruijnIndex, var: BoundVar, ty: Self::Ty) -> Self::Const;
-
-    /// Assert that an error has been delayed or emitted.
-    fn expect_error_or_delayed_bug();
 }
 
 /// Common capabilities of placeholder kinds