{"ast_node_type":"variable","tokens":[{"end":84,"kind":"keyword","start":0,"text":"let"}]}
        let args = trait_ref.args.extend_to(tcx, method.def_id, only_region_params);
        // `own_requires_monomorphization` on both the impl and method.
        let instance = ty::Instance::expect_resolve(tcx, typing_env, method.def_id, args, DUMMY_SP);