*
   * @since 19.0
   */
  public static HashFunction concatenating(
      HashFunction first, HashFunction second, HashFunction... rest) {
    // We can't use Lists.asList() here because there's no hash->collect dependency
    List<HashFunction> list = new ArrayList<>();
    list.add(first);
    list.add(second);
    Collections.addAll(list, rest);

    throw new UnsupportedOperationException();
  }

  private <T> T pickInstance(T[] instances, T defaultValue) {
    return pickInstance(Arrays.asList(instances), defaultValue);
  }

  private <T> T pickInstance(Collection<T> instances, T defaultValue) {
    if (instances.isEmpty()) {
      return defaultValue;
    }
    // generateInt() is 1-based.

    throw new UnsupportedOperationException();
  }

  private <T> T pickInstance(T[] instances, T defaultValue) {
    return pickInstance(Arrays.asList(instances), defaultValue);
  }

  private <T> T pickInstance(Collection<T> instances, T defaultValue) {
    if (instances.isEmpty()) {
      return defaultValue;
    }
    // generateInt() is 1-based.

  fun recoverFromMultipleCancelReusesConnection() {
    val responseDequeuedLatches =
      Arrays.asList(
        CountDownLatch(1),
        // No synchronization for the last request, which is not canceled:
        CountDownLatch(1),
        CountDownLatch(0),
      )
    val requestCanceledLatches =
      Arrays.asList(
        CountDownLatch(1),
        CountDownLatch(1),
        CountDownLatch(0),
      )

            // Samba woes on these
            // Smb2SessionSetupRequest + X -> INTERNAL_ERROR
            // Smb2TreeConnectRequest + IoCtl -> NETWORK_NAME_DELETED
            this.disallowCompound = new HashSet<>(Arrays.asList("Smb2SessionSetupRequest", "Smb2TreeConnectRequest"));
        }

        // Initialize multi-channel defaults if not set
        // Note: useMultiChannel defaults are handled by PropertyConfiguration

          }
        };
    List<Object> list = Collections.singletonList(object);
    for (int i = 0; i < 10; i++) {
      Object[] array = new Object[500];
      Arrays.fill(array, list);
      list = Arrays.asList(array);
    }
    future2.set(list);

    unused = future.toString();
  }

  public void testToString_notDone() throws Exception {
    AbstractFuture<Object> testFuture =

        if (file.isDirectory()) {
          File[] files = file.listFiles();
          if (files != null) {
            return unmodifiableList(Arrays.asList(files));
          }
        }

        return ImmutableList.of();
      };

  /**
   * Returns a predicate that returns the result of {@link File#isDirectory} on input files.
   *

   * elements.
   *
   * <p>To cycle over the elements {@code n} times, use the following: {@code
   * Iterables.concat(Collections.nCopies(n, Arrays.asList(elements)))}
   *
   * <p><b>Java 8+ users:</b> If passing a single element {@code e}, the {@code Stream} equivalent
   * of this method is {@code Stream.generate(() -> e)}. Otherwise, put the elements in a collection

    return ImmutableGraph.copyOf(graph);
  }

  private static void assertEqualCharNodes(Iterable<Character> result, String expectedCharacters) {
    assertThat(result)
        .containsExactlyElementsIn(Chars.asList(expectedCharacters.toCharArray()))
        .inOrder();
  }

  private static class RequestSavingGraph implements SuccessorsFunction<Character> {
    private final SuccessorsFunction<Character> delegate;

   * elements.
   *
   * <p>To cycle over the elements {@code n} times, use the following: {@code
   * Iterables.concat(Collections.nCopies(n, Arrays.asList(elements)))}
   *
   * <p><b>Java 8+ users:</b> If passing a single element {@code e}, the {@code Stream} equivalent
   * of this method is {@code Stream.generate(() -> e)}. Otherwise, put the elements in a collection