}

  @CanIgnoreReturnValue
  @Override
  @CheckForNull
  public E poll() {
    return isEmpty() ? null : removeAndGet(0);
  }

  @SuppressWarnings("unchecked") // we must carefully only allow Es to get in
  E elementData(int index) {
    /*
     * requireNonNull is safe as long as we're careful to call this method only with populated
     * indexes.
     */
    return (E) requireNonNull(queue[index]);

   *
   * <p>NOTE: an IPv6 address coerced to an IPv4 address can only be used for such purposes as
   * rudimentary identification or indexing into a collection of real {@link InetAddress}es. They
   * cannot be used as real addresses for the purposes of network communication.
   *
   * @param ip {@link InetAddress} to convert
   * @return {@code int}, "coerced" if ip is not an IPv4 address
   * @since 7.0

   *
   * <p><b>Performance note:</b> the instance returned is a singleton.
   */
  @SuppressWarnings({"unchecked"}) // fully variant implementation (never actually produces any Es)
  public static <E> ImmutableSet<E> of() {
    return (ImmutableSet<E>) RegularImmutableSet.EMPTY;
  }

  /**
   * Returns an immutable set containing {@code element}. Preferred over {@link

  /**
   * Returns an iterable whose iterator returns the given elements in order. The elements are copied
   * out of the source collection at the time this method is called.
   */
  @SuppressWarnings("unchecked") // Es come in, Es go out
  public static <E extends @Nullable Object> MinimalIterable<E> from(Collection<E> elements) {
    return (MinimalIterable) of(elements.toArray());
  }

  private @Nullable Iterator<E> iterator;

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  @Override
  @GwtIncompatible // Not supported.
  public Set<Entry<K, V>> entrySet() {
    // does not impact recency ordering
    Set<Entry<K, V>> es = entrySet;
    return (es != null) ? es : (entrySet = new EntrySet());
  }

  // Iterator Support

  abstract class HashIterator<T> implements Iterator<T> {

    int nextSegmentIndex;
    int nextTableIndex;

      @Override
      public boolean add(@ParametricNullness E element) {
        throw new UnsupportedOperationException();
      }

      @Override
      public boolean addAll(Collection<? extends E> es) {
        throw new UnsupportedOperationException();
      }
    };
  }

  private static <E extends @Nullable Object> SortedSet<E> removeOnlySortedSet(
      final SortedSet<E> set) {

            covered by testModule.gwt.xml. Maybe I'll try it someday.

            [*] https://code.google.com/p/google-web-toolkit/wiki/ResourceOracle#When_multiple_PathPrefix_es_have_the_same_path
                https://code.google.com/p/google-web-toolkit/issues/detail?id=7581
            -->
          <execution>
            <id>gwt-test</id>
            <goals>