{"ast_node_type":"other","tokens":[{"end":81,"kind":"keyword","start":0,"text":"(res,"}]}
            (res, Some(ty::GenericArgs::identity_for_item(tcx, tcx.parent(def))))
            // requires providing generic arguments for `[T, M, N]`.
        } else if let Res::SelfCtor(impl_def_id) = res {