{"ast_node_type":"other","tokens":[{"end":99,"kind":"keyword","start":0,"text":"Some(CoroutineKind::Gen"}]}
            Some(CoroutineKind::Gen { span, .. }) | Some(CoroutineKind::AsyncGen { span, .. }) => {
        match coroutine_kind {
                self.psess.gated_spans.gate(sym::gen_blocks, span);