// size of `callee_ref_nodes` but for now we don't ceare.
    if (!callee_ref_nodes.empty()) {
      return true;
    }
  }

  return false;
}

// Helper for GetNodesRelatedToRefVariables that traverses the graph in one
// direction.
Status GetNodesRelatedToRefVariablesInDirection(
    const Graph& graph, FunctionLibraryRuntime* lib_runtime,

  FunctionLibraryRuntime* lib_runtime =
      pflr->GetFLR(ProcessFunctionLibraryRuntime::kDefaultFLRDevice);

  TF_ASSIGN_OR_RETURN(absl::flat_hash_set<Node*> nodes_related_to_ref_vars,
                      GetNodesRelatedToRefVariables(*graph, lib_runtime));

  std::vector<string> names;
  absl::c_transform(nodes_related_to_ref_vars, std::back_inserter(names),
                    [](Node* n) { return n->name(); });
  absl::c_sort(names);