{"ast_node_type":"variable","tokens":[{"end":100,"kind":"keyword","start":0,"text":"let"}]}
        let status = EncoderState::new(encoder, sess.opts.unstable_opts.incremental_info, previous);
            .then(|| Lock::new(DepGraphQuery::new(prev_node_count)));
        GraphEncoder { status, record_graph, profiler: sess.prof.clone() }