{"ast_node_type":"other","tokens":[{"end":53,"kind":"keyword","start":0,"text":"CoroutineKind::AsyncGen"}]}
            CoroutineKind::AsyncGen { span, .. } => {
            CoroutineKind::Gen { .. } => hir::CoroutineDesugaring::Gen,
                span_bug!(span, "only async closures and `iter!` closures are supported currently")