{"ast_node_type":"other","tokens":[{"end":92,"kind":"keyword","start":0,"text":"CoroutineKind::Gen"}]}
            CoroutineKind::Gen { return_impl_trait_id, .. } => (return_impl_trait_id, None),
            CoroutineKind::Async { return_impl_trait_id, .. } => (return_impl_trait_id, None),
            CoroutineKind::AsyncGen { return_impl_trait_id, .. } => {