{"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"assert_eq!(self.mir_def.to_def_id(),"}]}
                assert_eq!(self.mir_def.to_def_id(), def_id);
            DefiningTy::CoroutineClosure(def_id, args) => {
                let closure_sig = args.as_coroutine_closure().coroutine_closure_sig();