* equivalence relations, for example if {@code set1} is a {@link HashSet} and {@code set2} is a
   * {@link TreeSet} or the {@link Map#keySet} of an {@code IdentityHashMap}.
   */
  public static <E extends @Nullable Object> SetView<E> difference(Set<E> set1, Set<?> set2) {
    checkNotNull(set1, "set1");
    checkNotNull(set2, "set2");

    return new SetView<E>() {

      Set<? extends E> set1, Set<? extends E> set2) {
    checkNotNull(set1, "set1");
    checkNotNull(set2, "set2");

    return new SetView<E>() {
      @Override
      public int size() {
        int size = set1.size();
        for (E e : set2) {
          if (!set1.contains(e)) {
            size++;
          }
        }
        return size;
      }

    BiPredicate<ImmutableSet<TypeWithDuplicates>, ImmutableSet<TypeWithDuplicates>> equivalence =
        (set1, set2) -> {
          if (!set1.equals(set2)) {
            return false;
          }
          for (int i = 0; i < set1.size(); i++) {
            if (!set1.asList().get(i).fullEquals(set2.asList().get(i))) {
              return false;
            }
          }
          return true;
        };

    BiPredicate<ImmutableSortedSet<String>, ImmutableSortedSet<String>> equivalence =
        (set1, set2) ->
            set1.equals(set2)
                && set1.asList().equals(set2.asList())
                && set1.comparator().equals(set2.comparator());
    ImmutableSortedSet<String> expected =
        ImmutableSortedSet.orderedBy(String.CASE_INSENSITIVE_ORDER).add("a", "B", "c", "d").build();

    assertThat(set1).containsExactly(LegacyComparable.Z);

    @SuppressWarnings("unchecked") // using a legacy comparable
    ImmutableSortedSet<LegacyComparable> set2 =
        ImmutableSortedSet.of(LegacyComparable.Z, LegacyComparable.Y);
    assertThat(set2).containsExactly(LegacyComparable.Y, LegacyComparable.Z);
  }

  public void testLegacyComparable_copyOf_collection() {
    ImmutableSortedSet<LegacyComparable> set =

        final Map<String, Object> source = new LinkedHashMap<>();
        source.put("title", "Test");
        source.put("content", "Body");
        source.put("cache", "cached");
        source.put("segment", "seg1");
        source.put("host", "example.com");

        final Set<String> excludeFields = Set.of("cache", "segment");
        final String html = new HtmlIndexExportFormatter().format(source, excludeFields);

			}
			a.Type = obj.TYPE_REG
			a.Reg = r1
			if r2 != 0 {
				// Form is R1:R2. It is on RHS and the second register
				// needs to go into the LHS.
				panic("cannot happen (Addr.Reg2)")
			}
		}
		// fmt.Printf("REG %s\n", obj.Dconv(&emptyProg, 0, a))
		p.expectOperandEnd()
		return
	}

	// Constant.
	haveConstant := false
	switch tok.ScanToken {

   * NavigableMap<K, V> map2 = map.subMap(foo, false, bar, true);
   *
   * // Needn't be in synchronized block
   * NavigableSet<K> set2 = map2.descendingKeySet();
   *
   * synchronized (map) { // Synchronizing on map, not map2 or set2!
   *   Iterator<K> it = set2.iterator(); // Must be in synchronized block
   *   while (it.hasNext()) {
   *     foo(it.next());
   *   }
   * }
   * }
   *

   * NavigableMap<K, V> map2 = map.subMap(foo, false, bar, true);
   *
   * // Needn't be in synchronized block
   * NavigableSet<K> set2 = map2.descendingKeySet();
   *
   * synchronized (map) { // Synchronizing on map, not map2 or set2!
   *   Iterator<K> it = set2.iterator(); // Must be in synchronized block
   *   while (it.hasNext()) {
   *     foo(it.next());
   *   }
   * }
   * }
   *

        "norwegian_stop": {
          "type":       "stop",