} else {
      assertNull(task.get(UNEXPECTED_HANG_DELAY_MILLIS, TimeUnit.MILLISECONDS));
    }
  }

  @Override
  protected void tearDown() throws Exception {
    // We don't want to leave stray threads running after each test. At this point, every thread
    // launched by this test is either:
    //
    // (a) Blocked attempting to enter the monitor.
    // (b) Waiting for the single guard to become satisfied.

public abstract class UnmodifiableIterator<E extends @Nullable Object> implements Iterator<E> {
  /** Constructor for use by subclasses. */
  protected UnmodifiableIterator() {}

  /**
   * Guaranteed to throw an exception and leave the underlying data unmodified.
   *
   * @throws UnsupportedOperationException always
   * @deprecated Unsupported operation.
   */
  @Deprecated
  @Override
  @DoNotCall("Always throws UnsupportedOperationException")

  int internalArrayEnd() {
    throw new UnsupportedOperationException();
  }

  @Override
  public abstract boolean contains(@CheckForNull Object object);

  /**
   * Guaranteed to throw an exception and leave the collection unmodified.
   *
   * @throws UnsupportedOperationException always
   * @deprecated Unsupported operation.
   */
  @CanIgnoreReturnValue
  @Deprecated
  @Override

			return err
		}
		defer func() {
			err := threadNS.Set() // switch back
			if err == nil {
				// Unlock the current thread only when we successfully switched back
				// to the original namespace; otherwise leave the thread locked which
				// will force the runtime to scrap the current thread, that is maybe
				// not as optimal but at least always safe to do.
				runtime.UnlockOSThread()
			}
		}()

		return toRun()
	}

    this.map = map;
    this.size = size;
  }

  // mutators (not supported)

  /**
   * Guaranteed to throw an exception and leave the multimap unmodified.
   *
   * @throws UnsupportedOperationException always
   * @deprecated Unsupported operation.
   */
  @CanIgnoreReturnValue
  @Deprecated
  @Override

            for (Node child : getChildren()) {
                if (!child.accept(visitor)) {
                    break;
                }
            }
        }
        return visitor.leave(this);
    }

    @Override
    public Node filter(Predicate<Node> filter) {
        List<Node> children =
                getChildren().stream().filter(filter).map(n -> n.filter(filter)).collect(Collectors.toList());

    this.map = map;
    this.size = size;
  }

  // mutators (not supported)

  /**
   * Guaranteed to throw an exception and leave the multimap unmodified.
   *
   * @throws UnsupportedOperationException always
   * @deprecated Unsupported operation.
   */
  @CanIgnoreReturnValue
  @Deprecated
  @Override

 * for exclusive consumption by the repository system and is opaque to the cache implementation.
 *
 */
@Deprecated
//
// Used by Tycho and will break users and force them to upgrade to Maven 3.1 so we should really leave
// this here, possibly indefinitely.
//
public interface RepositoryCache {

    /**
     * Puts the specified data into the cache. <strong>Warning:</strong> The cache will directly save the provided

   *
   * @throws UnsupportedOperationException always
   * @deprecated Unsupported operation.
   */
  @Deprecated
  @Override
  @DoNotCall("Always throws UnsupportedOperationException")
  public void remove(Range<C> range) {
    throw new UnsupportedOperationException();
  }

  /**

   *
   * @throws UnsupportedOperationException always
   * @deprecated Unsupported operation.
   */
  @Deprecated
  @Override
  @DoNotCall("Always throws UnsupportedOperationException")
  public void remove(Range<C> range) {
    throw new UnsupportedOperationException();
  }

  /**