An empty artifact that Guava depends on to signal that it is providing
    ListenableFuture -- but is also available in a second "version" that
    contains com.google.common.util.concurrent.ListenableFuture class, without
    any other Guava classes. The idea is:

    - If users want only ListenableFuture, they depend on listenablefuture-1.0.

    - If users want all of Guava, they depend on guava, which, as of Guava
    27.0, depends on

        }
        final PrunedTag other = (PrunedTag) obj;
        return StringUtils.compare(tag, other.tag) == 0 //
                && StringUtils.compare(css, other.css) == 0 //
                && StringUtils.compare(id, other.id) == 0 //
                && StringUtils.compare(attrName, other.attrName) == 0 //
                && StringUtils.compare(attrValue, other.attrValue) == 0;
    }

    /**

    ToOptionalState combine(ToOptionalState other) {
      if (element == null) {
        return other;
      } else if (other.element == null) {
        return this;
      } else {
        if (extras.isEmpty()) {
          // Replace immutable empty list with mutable list.
          extras = new ArrayList<>();
        }
        extras.add(other.element);
        extras.addAll(other.extras);

  patent or other intellectual property rights of any other entity.
  Each Contributor disclaims any liability to Recipient for claims
  brought by any other entity based on infringement of intellectual
  property rights or otherwise. As a condition to exercising the
  rights and licenses granted hereunder, each Recipient hereby
  assumes sole responsibility to secure any other intellectual

  public void testPutAllTable() {
    table = create("foo", 1, 'a', "bar", 1, 'b', "foo", 3, 'c');
    Table<String, Integer, @NonNull C> other = HashBasedTable.create();
    other.put("foo", 1, cellValue('d'));
    other.put("bar", 2, cellValue('e'));
    other.put("cat", 2, cellValue('f'));
    table.putAll(other);
    assertEquals((Character) 'd', table.get("foo", 1));
    assertEquals((Character) 'b', table.get("bar", 1));

    for details.

    The summary is that it ignores one file in favor of the other.
    util.concurrent, like nearly all our packages, has two .gwt.xml files: one
    for prod and one for tests. However, unlike our other packages, as of this
    writing it has test supersource but no prod supersource.

    GWT happens to use the prod .gwt.xml, so it looks for no supersource for

     * For other types of values, they are registered directly.
     *
     * @param data the RenderData object to register the value in
     * @param key the key to associate with the value
     * @param value the value to register; can be null, Entity, Collection, or any other object
     */

    } //-- int hashCode()

    /**
     * Checks equality based on {@link #getType()} and {@link #getProvides()} values.
     */
    public boolean equals(Object other) {
        if (this == other) {
            return true;
        } else if (other instanceof ToolchainModel that) {
            return java.util.Objects.equals(this.getType(), that.getType())

    for details.

    The summary is that it ignores one file in favor of the other.
    util.concurrent, like nearly all our packages, has two .gwt.xml files: one
    for prod and one for tests. However, unlike our other packages, as of this
    writing it has test supersource but no prod supersource.

    GWT happens to use the prod .gwt.xml, so it looks for no supersource for

   *   <li>The space character " " is converted into %20.
   *   <li>All other characters are converted into one or more bytes using UTF-8 encoding and each
   *       byte is then represented by the 3-character string "%XY", where "XY" is the two-digit,
   *       uppercase, hexadecimal representation of the byte value.
   * </ul>
   *
   * <p><b>Note:</b> Unlike other escapers, URL escapers produce <a