syntax_data: {"ast_node_type":"other","tokens":[{"end":92,"kind":"keyword","start":0,"text":"hir::CoroutineKind::Desugared(hir::CoroutineDesugaring::Gen,"}]}
source_snippet:                     hir::CoroutineKind::Desugared(hir::CoroutineDesugaring::Gen, ..) => "a",
context_before:                     hir::CoroutineKind::Desugared(hir::CoroutineDesugaring::AsyncGen, ..) => "an",
context_after:                     hir::CoroutineKind::Coroutine(_) => "a",