{"ast_node_type":"other","tokens":[{"end":96,"kind":"keyword","start":0,"text":"///"}]}
/// reachable from it have been examined. This allows us to differentiate between "tree", "back"
/// becomes `Visited` when it is first examined by the DFS and is `Settled` when all nodes
/// and "forward" edges (see [`TriColorVisitor::node_examined`]).