// 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,