Create some minimal HIR for associated opaque types

compiler/rustc_lint/src/late.rs

@@ -356,7 +356,7 @@ pub fn late_lint_mod<'tcx, T: LateLintPass<'tcx> + 'tcx>(
         cached_typeck_results: Cell::new(None),
         param_env: ty::ParamEnv::empty(),
         effective_visibilities: tcx.effective_visibilities(()),
-        last_node_with_lint_attrs: tcx.local_def_id_to_hir_id(module_def_id.into()),
+        last_node_with_lint_attrs: tcx.local_def_id_to_hir_id(module_def_id),
         generics: None,
         only_module: true,
     };

compiler/rustc_lint/src/levels.rs

@@ -190,6 +190,7 @@ fn shallow_lint_levels_on(tcx: TyCtxt<'_>, owner: hir::OwnerId) -> ShallowLintLe
                 levels.add_id(hir::CRATE_HIR_ID);
                 levels.visit_mod(mod_, mod_.spans.inner_span, hir::CRATE_HIR_ID)
             }
+            hir::OwnerNode::AssocOpaqueTy(..) => unreachable!(),
         },
     }