syntax_data: {"ast_node_type":"other","tokens":[{"end":75,"kind":"keyword","start":0,"text":"CoroutineKind::Desugared(CoroutineDesugaring::AsyncGen,"}]}
source_snippet:             CoroutineKind::Desugared(CoroutineDesugaring::AsyncGen, _) => {
context_before:             // `async gen` continues to return `Poll::Ready(None)`
context_after:                 let ty::Adt(_poll_adt, args) = *self.old_yield_ty.kind() else { bug!() };