// used in this graph
      for (const auto& pair : g->name_map) {
        const string& name = pair.first;
        if ((name == prefix) || absl::StartsWith(name, prefix_cmp)) {
          status->status = InvalidArgument(
              "prefix [", prefix,
              "] conflicts with existing node in the graph named [", name, "]");
          return;
        }