{"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":")"}]}
    ) -> Result<&'tcx CoroutineLayout<'tcx>, &'tcx LayoutError<'tcx>> {
        args: GenericArgsRef<'tcx>,
        let ty = || Ty::new_coroutine(self, def_id, args);