{"ast_node_type":"variable","tokens":[{"end":26,"kind":"keyword","start":0,"text":"let"}]}
        let mut start = 0;
        let mut scc_regions = FxIndexMap::default();
        for chunk in paired_scc_regions.chunk_by(|&(scc1, _), &(scc2, _)| scc1 == scc2) {