unsigned char is_list;

  // Length of the list if is_list is true. Undefined otherwise.
  int64_t list_size;

  // Type of elements of the list if is_list != 0.
  // Type of the single value stored in the attribute if is_list == 0.
  TF_AttrType type;

  // Total size the attribute value.
  // The units of total_size depend on is_list and type.

  TFE_OpAddAttrs(copy_op, attributes);
  unsigned char is_list = 0;
  ASSERT_EQ(TF_ATTR_TYPE,
            TFE_OpGetAttrType(copy_op, "dtype", &is_list, status));
  CHECK_EQ(TF_OK, TF_GetCode(status)) << TF_Message(status);
  ASSERT_EQ(TF_ATTR_SHAPE,
            TFE_OpGetAttrType(copy_op, "shape", &is_list, status));
  CHECK_EQ(TF_OK, TF_GetCode(status)) << TF_Message(status);

      EXPECT_EQ("Operation 'add' has no attr named '_class'.",
                std::string(TF_Message(s_)));
      return;
    }
    EXPECT_EQ(TF_OK, TF_GetCode(s_)) << TF_Message(s_);
    EXPECT_EQ(1, m.is_list);
    EXPECT_EQ(expected.size(), m.list_size);
    EXPECT_EQ(TF_ATTR_STRING, m.type);
    std::vector<void*> values(expected.size());
    std::vector<size_t> lens(expected.size());