{"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":"#[instrument(skip(self,"}]}
    #[instrument(skip(self, initial), level = "trace")]
    /// us to maintain an allocated stack for nodes on the path between calls.
    fn walk_unvisited_node(&mut self, initial: G::Node) -> WalkReturn<A::SccIdx, A::Ann> {