syntax_data: {"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":"ty::Coroutine(_,"}]}
source_snippet:         ty::Coroutine(_, args) => Some(Box::new(CoroutineInfo::initial(
context_before:     let coroutine = match tcx.type_of(fn_def).instantiate_identity().kind() {
context_after:             tcx.coroutine_kind(fn_def).unwrap(),