syntax_data: {"ast_node_type":"other","tokens":[{"end":86,"kind":"keyword","start":0,"text":"hir::CoroutineKind::Desugared(hir::CoroutineDesugaring::Async,"}]}
source_snippet:                 hir::CoroutineKind::Desugared(hir::CoroutineDesugaring::Async, _) => {
context_before:             let (resume_ty, ret_ty) = match coroutine_kind {
context_after:                     // The signature should be `Future::poll(_, &mut Context<'_>) -> Poll<Output>`