{"ast_node_type":"other","tokens":[{"end":51,"kind":"keyword","start":0,"text":"trace!(\"Walk"}]}
        trace!("Walk unvisited node: {initial:?}");
    fn walk_unvisited_node(&mut self, initial: G::Node) -> WalkReturn<A::SccIdx, A::Ann> {
        struct VisitingNodeFrame<G: DirectedGraph, Successors, A> {