* @param otherElements the rest of the elements the set should contain
   * @return an immutable set containing those elements, minus duplicates
   */
  // http://code.google.com/p/google-web-toolkit/issues/detail?id=3028
  @GwtCompatible(serializable = true)
  public static <E extends Enum<E>> ImmutableSet<E> immutableEnumSet(
      E anElement, E... otherElements) {

   * @param otherElements the rest of the elements the set should contain
   * @return an immutable set containing those elements, minus duplicates
   */
  // http://code.google.com/p/google-web-toolkit/issues/detail?id=3028
  @GwtCompatible(serializable = true)
  public static <E extends Enum<E>> ImmutableSet<E> immutableEnumSet(
      E anElement, E... otherElements) {

    }

    private abstract class SubOuter extends BaseOuter {
      private abstract class SubInner extends BaseInner {}
    }
  }

  // For Guava bug http://code.google.com/p/guava-libraries/issues/detail?id=1025
  public void testDespiteGenericSignatureFormatError() {
    ImmutableSet<?> unused =
        ImmutableSet.copyOf(
            TypeToken.of(ToReproduceGenericSignatureFormatError.SubOuter.SubInner.class)

 * Caffeine}</a> class. Caffeine offers better performance, more features (including asynchronous
 * loading), and fewer <a
 * href="https://github.com/google/guava/issues?q=is%3Aopen+is%3Aissue+label%3Apackage%3Dcache+label%3Atype%3Ddefect">bugs</a>.
 *
 * <p>Caffeine defines its own interfaces (<a

   * in a name which is a key in this map, it is a public suffix.
   */
  public static final ImmutableMap<String, PublicSuffixType> UNDER =
      TrieParser.parseTrie(

   * in a name which is a key in this map, it is a public suffix.
   */
  public static final ImmutableMap<String, PublicSuffixType> UNDER =
      TrieParser.parseTrie(

   * checkNotNull *should* be annotated to require it to be non-null.
   *
   * However, for a variety of reasons, Google developers have written a ton of code over the past
   * decade that assumes that they can use checkNotNull for non-precondition checks. I had hoped to
   * take a principled stand on this, but the amount of such code is simply overwhelming. To avoid

    // waiter.
    // requireNonNull is safe because value is always set before TOMBSTONE.
    return getDoneValue(requireNonNull(value));
  }

  /** Unboxes {@code obj}. Assumes that obj is not {@code null} or a {@link SetFuture}. */
  @ParametricNullness
  private V getDoneValue(Object obj) throws ExecutionException {

    // waiter.
    // requireNonNull is safe because value is always set before TOMBSTONE.
    return getDoneValue(requireNonNull(value));
  }

  /** Unboxes {@code obj}. Assumes that obj is not {@code null} or a {@link SetFuture}. */
  @ParametricNullness
  private V getDoneValue(Object obj) throws ExecutionException {

  // For a (long) discussion about this specific issue and the general futility of life.
  //
  // For the time being we are OK with the problem discussed above since it requires a caller to
  // introduce a very specific kind of data-race. And given the other operations performed by these
  // methods that involve volatile read/write operations, in practice there is no issue. Also, the