ImmutableList<? extends ListenableFuture<? extends Object>> inputs =
        ImmutableList.of(future1, future2, future3);
    ImmutableList<ListenableFuture<Object>> futures = inCompletionOrder(inputs);
    future2.set("1L");
    future1.set(2L);
    future3.set(3);

    ImmutableList<?> expected = ImmutableList.of("1L", 2L, 3);
    for (int i = 0; i < expected.size(); i++) {

    ImmutableList<? extends ListenableFuture<? extends Object>> inputs =
        ImmutableList.of(future1, future2, future3);
    ImmutableList<ListenableFuture<Object>> futures = inCompletionOrder(inputs);
    future2.set("1L");
    future1.set(2L);
    future3.set(3);

    ImmutableList<?> expected = ImmutableList.of("1L", 2L, 3);
    for (int i = 0; i < expected.size(); i++) {

   * <p>Only for use by a {@link CombiningCallable} or {@link AsyncCombiningCallable} object.
   */
  public static final class Peeker {
    private final ImmutableList<ClosingFuture<?>> futures;
    private volatile boolean beingCalled;

    private Peeker(ImmutableList<ClosingFuture<?>> futures) {
      this.futures = checkNotNull(futures);
    }

    /**
     * Returns the value of {@code closingFuture}.
     *

      List<ReferenceEntry<K, V>> writeOrder) {
    if (map.evictsBySize() || map.expiresAfterAccess()) {
      assertSameEntries(readOrder, ImmutableList.copyOf(segment.accessQueue));
    }
    if (map.expiresAfterWrite()) {
      assertSameEntries(writeOrder, ImmutableList.copyOf(segment.writeQueue));
    }
  }

  private static <K, V> void assertSameEntries(

      List<ReferenceEntry<K, V>> writeOrder) {
    if (map.evictsBySize() || map.expiresAfterAccess()) {
      assertSameEntries(readOrder, ImmutableList.copyOf(segment.accessQueue));
    }
    if (map.expiresAfterWrite()) {
      assertSameEntries(writeOrder, ImmutableList.copyOf(segment.writeQueue));
    }
  }

  private static <K, V> void assertSameEntries(