assertThat(Comparators.max(a, b)).isSameInstanceAs(a);
  }

  public void testMinMaxComparator() {
    Comparator<Integer> natural = Ordering.natural();
    Comparator<Integer> reverse = Collections.reverseOrder(natural);
    assertThat(Comparators.min(1, 2, reverse)).isEqualTo(2);
    assertThat(Comparators.min(2, 1, reverse)).isEqualTo(2);
    assertThat(Comparators.max(1, 2, reverse)).isEqualTo(1);

    return elements;
  }

  @Override
  ImmutableSortedSet<E> createDescendingSet() {
    Comparator<? super E> reversedOrder = Collections.reverseOrder(comparator);
    return isEmpty()
        ? emptySet(reversedOrder)
        : new RegularImmutableSortedSet<E>(elements.reverse(), reversedOrder);
  }

  // redeclare to help optimizers with b/310253115
  @SuppressWarnings("RedundantOverride")
  @Override

                logger.debug("{} does not exists.", dir);
            }
            return;
        }
        try (Stream<Path> walk = Files.walk(dir, FileVisitOption.FOLLOW_LINKS)) {
            walk.sorted(Comparator.reverseOrder()).forEach(f -> {
                if (logger.isDebugEnabled()) {
                    logger.debug("Deleting {}", f);
                }
                try {
                    Files.delete(f);

  }

  @Override
  ImmutableSortedSet<E> createDescendingSet() {
    Comparator<? super E> reversedOrder = Collections.reverseOrder(comparator);
    return isEmpty()
        ? emptySet(reversedOrder)
        : new RegularImmutableSortedSet<E>(elements.reverse(), reversedOrder);
  }

  // redeclare to help optimizers with b/310253115
  @SuppressWarnings("RedundantOverride")
  @Override