@Override
  public void forEach(BiConsumer<? super K, ? super V> action) {
    delegate.forEach(action);
  }

  @Override
  boolean isPartialView() {
    return false;
  }

  // All callers of the constructor are restricted to <K extends Enum<K>>.
  @Override
  @J2ktIncompatible // serialization
  Object writeReplace() {
    return new EnumSerializedForm<>(delegate);
  }

         * requireNonNull is safe because the callers promise to put non-null objects in the first
         * `length` array elements.
         */
        @SuppressWarnings("unchecked") // our callers put only E instances into the array
        E onlyElement = (E) requireNonNull(elements[0]);
        return of(onlyElement);
      default:
        /*
         * The suppression is safe because the callers promise to put non-null objects in the first

 * initiate a graceful shutdown (close code 1001) and `send()` will return `false`. No exception is
 * thrown and no [WebSocketListener.onFailure] callback is triggered, so callers should always check
 * the return value of `send()`.
 *
 * Use [queueSize] to monitor backpressure before sending. For large payloads, consider breaking
 * them into smaller messages or using HTTP requests instead.
 */

  }

  /** Returns an {@link EndpointPair} representing the endpoints of an undirected edge. */
  public static <N> EndpointPair<N> unordered(N nodeU, N nodeV) {
    // Swap nodes on purpose to prevent callers from relying on the "ordering" of an unordered pair.
    return new Unordered<>(nodeV, nodeU);
  }

  /** Returns an {@link EndpointPair} representing the endpoints of an edge in {@code graph}. */

   *     the {@link ExecutionException} thrown by {@code input.get()} or, if {@code get()} throws a
   *     different kind of exception, that exception itself. To avoid hiding bugs and other
   *     unrecoverable errors, callers should prefer more specific types, avoiding {@code
   *     Throwable.class} in particular.
   * @param fallback the {@link Function} to be called if {@code input} fails with the expected

    return transitiveClosure.build();
  }

  /**
   * Equivalent to {@code transitiveClosure(graph, ADD_SELF_LOOPS_ALWAYS)}. Callers should look at
   * the different strategy options that the new method supports rather than simply migrating to the
   * new method with the existing behavior; we believe that most callers will want to use the {@code
   * ADD_SELF_LOOPS_FOR_CYCLES} strategy.
   *

  public final @Nullable V getOrDefault(@Nullable Object key, @Nullable V defaultValue) {
    /*
     * Even though it's weird to pass a defaultValue that is null, some callers do so. Those who
     * pass a literal "null" should probably just use `get`, but I would expect other callers to
     * pass an expression that *might* be null. This could happen with:
     *
     * - a `getFooOrDefault(@Nullable Foo defaultValue)` method that returns

     * <p>For example, if horizon is {@code [[a, b], [c, d], [e]]}, {@code visitNext()} will return
     * {@code [a, b, null, c, d, null, e, null]} sequentially, encoding the topological structure.
     * (Note, however, that the callers of {@code visitNext()} often insert additional iterators
     * into {@code horizon} between calls to {@code visitNext()}. This causes them to receive
     * additional values interleaved with those shown above.)
     */

            }
          }
        };
    thread.setDaemon(true);
    thread.start();
    awaitUninterruptibly(latch);
    return thread;
  }

  // We are implementing Condition, so our callers are responsible for the loop.
  @SuppressWarnings("WaitNotInLoop")
  private static class TestCondition implements Condition {
    private final Lock lock;
    private final Condition condition;

    public Integer get(int index) {
      checkElementIndex(index, size());
      return array[start + index];
    }

    @Override
    /*
     * This is an override that is not directly visible to callers, so NewApi will catch calls to
     * Collection.spliterator() where necessary.
     */
    @IgnoreJRERequirement
    public Spliterator.OfInt spliterator() {
      return Spliterators.spliterator(array, start, end, 0);