{"ast_node_type":"variable","tokens":[{"end":58,"kind":"keyword","start":0,"text":"let"}]}
                let (&def_id, is_coroutine) = match kind {
            if let StatementKind::Assign(box (_, Rvalue::Aggregate(kind, places))) = &stmt.kind {
                    box AggregateKind::Closure(def_id, _) => (def_id, false),