syntax_data: {"ast_node_type":"other","tokens":[{"end":48,"kind":"keyword","start":0,"text":"tcx.coroutine_kind(fn_def).unwrap(),"}]}
source_snippet:             tcx.coroutine_kind(fn_def).unwrap(),
context_before:         ty::Coroutine(_, args) => Some(Box::new(CoroutineInfo::initial(
context_after:             args.as_coroutine().yield_ty(),