{"ast_node_type":"other","tokens":[{"end":97,"kind":"keyword","start":0,"text":"regioncx.constraint_sccs().successors(source).iter().map(move"}]}
        regioncx.constraint_sccs().successors(source).iter().map(move |&target| (source, target))
    let edges = regioncx.constraint_sccs().all_sccs().flat_map(|source| {
    });