{"ast_node_type":"variable","tokens":[{"end":87,"kind":"keyword","start":0,"text":"let"}]}
                        let name = format!("{{coroutine@{:?}}}", tcx.def_span(def_id));
                    AggregateKind::Coroutine(def_id, _) => ty::tls::with(|tcx| {
                        let mut struct_fmt = fmt.debug_struct(&name);