{"ast_node_type":"other","tokens":[{"end":85,"kind":"keyword","start":0,"text":")"}]}
            ) if coroutine_a == coroutine_b => zip_substs(self, None, sub_a, sub_b)?,
                TyKind::CoroutineWitness(coroutine_b, sub_b),
            (TyKind::Function(fn_ptr_a), TyKind::Function(fn_ptr_b))