syntax_data: {"ast_node_type":"other","tokens":[{"end":47,"kind":"keyword","start":0,"text":"ty::CoroutineClosure(def_id,"}]}
source_snippet:         ty::CoroutineClosure(def_id, args) => {
context_before:         }
context_after:             let coroutine_ty = Ty::new_coroutine_closure(tcx, def_id, args);