FIFOQueue::Capacity(3));
  auto dequeue0 =
      QueueDequeue(root.WithOpName(kDequeueOp0), q0, {DataType::DT_INT32});
  auto enqueue1 = QueueEnqueue(root.WithOpName(kEnqueueOp1), q1, {dequeue0[0]});
  auto dequeue1 =
      QueueDequeue(root.WithOpName(kDequeueOp1), q1, {DataType::DT_INT32});
  auto close1 = QueueClose(root.WithOpName(kCloseOp1), q1);

namespace tensorflow {
namespace ops {
namespace {

REGISTER_NO_GRADIENT_OP("Queue");
REGISTER_NO_GRADIENT_OP("QueueEnqueue");
REGISTER_NO_GRADIENT_OP("QueueEnqueueMany");
REGISTER_NO_GRADIENT_OP("QueueDequeue");
REGISTER_NO_GRADIENT_OP("QueueDequeueMany");
REGISTER_NO_GRADIENT_OP("QueueDequeueUpTo");
REGISTER_NO_GRADIENT_OP("QueueClose");
REGISTER_NO_GRADIENT_OP("QueueSize");
REGISTER_NO_GRADIENT_OP("Stack");