{"ast_node_type":"other","tokens":[{"end":69,"kind":"keyword","start":0,"text":"//"}]}
                // Feature-gate `gen ||` and `async gen ||` closures.
            Some(CoroutineKind::Gen { span, .. }) | Some(CoroutineKind::AsyncGen { span, .. }) => {
                // FIXME(gen_blocks): This perhaps should be a different gate.