public abstract class ForwardingSet<E extends @Nullable Object> extends ForwardingCollection<E>
    implements Set<E> {
  // TODO(lowasser): identify places where thread safety is actually lost

  /** Constructor for use by subclasses. */
  protected ForwardingSet() {}

  @Override
  protected abstract Set<E> delegate();

  @Override
  public boolean equals(@Nullable Object object) {
    return object == this || delegate().equals(object);
  }

  }

  /**
   * A sensible definition of {@link #subMultiset(Object, BoundType, Object, BoundType)} in terms of
   * {@link #headMultiset(Object, BoundType) headMultiset} and {@link #tailMultiset(Object,
   * BoundType) tailMultiset}.
   *
   * <p>If you override either of these methods, you may wish to override {@link
   * #subMultiset(Object, BoundType, Object, BoundType)} to forward to this implementation.
   */

		err = NotImplemented{}
	case "OutOfRangeInput":
		err = ObjectNameInvalid{
			Bucket: bucket,
			Object: object,
		}
	default:
		switch statusCode {
		case http.StatusNotFound:
			if object != "" {
				err = ObjectNotFound{
					Bucket: bucket,
					Object: object,
				}
			} else {
				err = BucketNotFound{Bucket: bucket}
			}
		case http.StatusBadRequest:

    void optionsMap_notMutated_verifyNoWrites() {
        // Arrange: create a regular map first, then spy on it
        Map<String, Object> originalMap = new HashMap<>();
        originalMap.put("refreshKrb5Config", "true");

        @SuppressWarnings("unchecked")
        Map<String, Object> spyOpts = spy(originalMap);

        // Reset the spy to clear any prior invocations from setup
        reset(spyOpts);

public final class SafeTreeMap<K, V> implements Serializable, NavigableMap<K, V> {
  @SuppressWarnings("unchecked")
  private static final Comparator<Object> NATURAL_ORDER =
      new Comparator<Object>() {
        @Override
        public int compare(Object o1, Object o2) {
          return ((Comparable<Object>) o1).compareTo(o2);
        }
      };

  private final NavigableMap<K, V> delegate;

  public SafeTreeMap() {

    private final Object[] cellValues;
    private final int[] cellRowIndices;
    private final int[] cellColumnIndices;

    private SerializedForm(
        Object[] rowKeys,
        Object[] columnKeys,
        Object[] cellValues,
        int[] cellRowIndices,
        int[] cellColumnIndices) {
      this.rowKeys = rowKeys;
      this.columnKeys = columnKeys;
      this.cellValues = cellValues;

 * An XML writer request.
 *
 * @since 4.0.0
 * @param <T> the object type to read
 */
@Experimental
public interface XmlWriterRequest<T> {

    @Nullable
    Path getPath();

    @Nullable
    OutputStream getOutputStream();

    @Nullable
    Writer getWriter();

    @Nonnull
    T getContent();

    @Nullable
    Function<Object, String> getInputLocationFormatter();

   */

  public static List<BlockingQueue<Object>> blockingQueues() {
    return ImmutableList.<BlockingQueue<Object>>of(
        new LinkedBlockingQueue<Object>(),
        new LinkedBlockingQueue<Object>(10),
        new SynchronousQueue<Object>(),
        new ArrayBlockingQueue<Object>(10),
        new LinkedBlockingDeque<Object>(),
        new LinkedBlockingDeque<Object>(10),

    if (length == 0) {
      return new Object[0];
    }
    @Nullable Object[] result = new Object[length];
    arraycopy(elements, offset, result, 0, length);
    return result;
  }

  @CanIgnoreReturnValue
  private static @Nullable Object[] fillArray(Iterable<?> elements, @Nullable Object[] array) {
    int i = 0;
    for (Object element : elements) {
      array[i++] = element;
    }

/**
 * An unhashable object to be used in testing as values in our collections.
 *
 * @author Regina O'Dell
 */
@GwtCompatible
public class UnhashableObject implements Comparable<UnhashableObject> {
  private final int value;

  public UnhashableObject(int value) {
    this.value = value;
  }

  @Override
  public boolean equals(@Nullable Object object) {
    if (object instanceof UnhashableObject) {