{"ast_node_type":"other","tokens":[{"end":77,"kind":"keyword","start":0,"text":"box"}]}
                    box AggregateKind::Closure(def_id, _) => (def_id, false),
                let (&def_id, is_coroutine) = match kind {
                    box AggregateKind::Coroutine(def_id, _) => (def_id, true),