{"ast_node_type":"other","tokens":[{"end":51,"kind":"keyword","start":0,"text":"IndexVec::with_capacity(graph.num_nodes());"}]}
        IndexVec::with_capacity(graph.num_nodes());
    let mut pre_order_to_real: IndexVec<PreorderIndex, G::Node> =
    let mut real_to_pre_order: IndexVec<G::Node, Option<PreorderIndex>> =