syntax_data: {"ast_node_type":"other","tokens":[{"end":95,"kind":"keyword","start":0,"text":"hir::CoroutineKind::Desugared(hir::CoroutineDesugaring::Async,"}]}
source_snippet:                     hir::CoroutineKind::Desugared(hir::CoroutineDesugaring::Async, ..) => "an",
context_before:                 match coroutine_kind {
context_after:                     hir::CoroutineKind::Desugared(hir::CoroutineDesugaring::AsyncGen, ..) => "an",