{"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"assert_eq!(metadata_def_id,"}]}
        assert_eq!(metadata_def_id, goal.predicate.def_id());
        let metadata_def_id = cx.require_lang_item(TraitSolverLangItem::Metadata);
        let metadata_ty = match goal.predicate.self_ty().kind() {