{"ast_node_type":"other","tokens":[{"end":67,"kind":"keyword","start":0,"text":"self.psess.gated_spans.gate(sym::gen_blocks,"}]}
                self.psess.gated_spans.gate(sym::gen_blocks, span);
            Some(CoroutineKind::Gen { span, .. }) | Some(CoroutineKind::AsyncGen { span, .. }) => {
            }