{"ast_node_type":"variable","tokens":[{"end":56,"kind":"keyword","start":0,"text":"let"}]}
    let mut annotations = Maxes(IndexVec::new(), |n| n);
    let graph = TestGraph::new(0, &[(0, 2), (2, 3), (2, 4), (4, 1), (1, 2)]);
    let sccs = Sccs::new_with_annotation(&graph, &mut annotations);