TFE_OpAttrsSerialize(attributes, serialized_attr_values, status);
  CHECK_EQ(TF_OK, TF_GetCode(status)) << TF_Message(status);
  tensorflow::NameAttrList name_and_attrs;
  ASSERT_TRUE(name_and_attrs.ParseFromArray(serialized_attr_values->data,
                                            serialized_attr_values->length));
  ASSERT_EQ("VarHandleOp", name_and_attrs.name());
  ASSERT_EQ(tensorflow::DT_INT64,