assertEquals(ImmutableSortedSet.of(2, 4, 6), Sets.subSet(set, Range.atMost(7)));
    assertEquals(set, Sets.subSet(set, Range.atMost(20)));
  }

  @GwtIncompatible // NavigableSet
  public void testSubSet_unboundedRange() {
    ImmutableSortedSet<Integer> set = ImmutableSortedSet.of(2, 4, 6, 8, 10);

    assertEquals(set, Sets.subSet(set, Range.<Integer>all()));
  }

  @GwtIncompatible // NavigableSet