{"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":"ref_tracking_for_consts.seen.insert(val);"}]}
        ref_tracking_for_consts.seen.insert(val);
            RefTracking { seen: FxHashSet::default(), todo: vec![(val.clone(), PATH::default())] };
        ref_tracking_for_consts