* MoreObjects.toStringHelper(this)
   *     .omitNullValues()
   *     .add("x", 1)
   *     .add("y", null)
   *     .toString();
   * }</pre>
   *
   * <p>Note that in GWT, class names are often obfuscated.
   *
   * @param self the object to generate the string for (typically {@code this}), used only for its
   *     class name
   * @since 18.0 (since 2.0 as {@code Objects.toStringHelper()}).
   */

   * MoreObjects.toStringHelper(this)
   *     .omitNullValues()
   *     .add("x", 1)
   *     .add("y", null)
   *     .toString();
   * }</pre>
   *
   * <p>Note that in GWT, class names are often obfuscated.
   *
   * @param self the object to generate the string for (typically {@code this}), used only for its
   *     class name
   * @since 18.0 (since 2.0 as {@code Objects.toStringHelper()}).
   */