new DerivedComparable("bar"),
            new DerivedComparable("bar"),
            new DerivedComparable("foo"),
            new DerivedComparable("foo"))
        .inOrder();
  }

  public void testNewTreeMultisetNonGeneric() {
    TreeMultiset<LegacyComparable> set = TreeMultiset.create();
    assertTrue(set.isEmpty());
    set.add(new LegacyComparable("foo"), 2);
    set.add(new LegacyComparable("bar"), 3);
    assertThat(set)