NodeBuilder::NodeOut enter_input(enter_output.node(), enter_output.index());

  const int next_output_index = 0;
  DataType dtype = enter_output.node()->output_type(0);
  NodeBuilder::NodeOut next_input(NextIterationName(scope, loop_var_idx),
                                  next_output_index, dtype);

  std::vector<NodeBuilder::NodeOut> input_list({enter_input, next_input});