{"ast_node_type":"other","tokens":[{"end":92,"kind":"keyword","start":0,"text":"assert!(is_unvisited.is_empty(),"}]}
        assert!(is_unvisited.is_empty(), "some nodes were never visited: {is_unvisited:?}");
        let Self { ref span_edges, ref is_unvisited, ref counter_terms, .. } = self;
        debug_assert!(