syntax_data: {"ast_node_type":"other","tokens":[{"end":14,"kind":"keyword","start":0,"text":"_"}]}
source_snippet:         _ => {
context_before:         CoroutineKind::Desugared(CoroutineDesugaring::Gen, _) => {}
context_after:             make_coroutine_state_argument_pinned(tcx, &mut body);