{"ast_node_type":"other","tokens":[{"end":99,"kind":"keyword","start":0,"text":"Some(CoroutineKind::Gen"}]}
            Some(CoroutineKind::Gen { span, .. }) | Some(CoroutineKind::AsyncGen { span, .. }) => {
            Some(CoroutineKind::Async { .. }) => {}
                // Feature-gate `gen ||` and `async gen ||` closures.