{"ast_node_type":"variable","tokens":[{"end":81,"kind":"keyword","start":0,"text":"let"}]}
        let origin = var_to_origin.get(&reg_var).unwrap_or(&RegionCtxt::Unknown);
    for (reg_var, scc_idx) in sccs.scc_indices().iter_enumerated() {
        components[scc_idx.as_usize()].insert((reg_var, *origin));