syntax_data: {"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"Some(Box::new(CoroutineInfo::initial("}]}
source_snippet:                         Some(Box::new(CoroutineInfo::initial(
context_before:                         return_ty,
context_after:                             tcx.coroutine_kind(def_id).unwrap(),