syntax_data: {"ast_node_type":"other","tokens":[{"end":92,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:         if matches!(coroutine_kind, CoroutineKind::Desugared(CoroutineDesugaring::Gen, _)) {
context_before:         // Remove the context argument within generator bodies.
context_after:             transform_gen_context(body);