* {@link TreeSet} or the {@link Map#keySet} of an {@code IdentityHashMap}.
   *
   * <p><b>Note:</b> The returned view performs slightly better when {@code set1} is the smaller of
   * the two sets. If you have reason to believe one of your sets will generally be smaller than the
   * other, pass it first. Unfortunately, since this method sets the generic type of the returned

 * better) behavior</a> when multiple threads attempt concurrent mutations. Its equivalent to {@code
 * CacheBuilder} is its <a
 * href="https://www.javadoc.io/doc/com.github.ben-manes.caffeine/caffeine/latest/com.github.benmanes.caffeine/com/github/benmanes/caffeine/cache/Caffeine.html">{@code
 * Caffeine}</a> class. Caffeine offers better performance, more features (including asynchronous

  public static class Chars extends SampleElements<Character> {
    public Chars() {
      // elements aren't sorted, to better test SortedSet iteration ordering
      super('b', 'a', 'c', 'd', 'e');
    }
  }

  public static class Enums extends SampleElements<AnEnum> {
    public Enums() {
      // elements aren't sorted, to better test SortedSet iteration ordering
      super(AnEnum.B, AnEnum.A, AnEnum.C, AnEnum.D, AnEnum.E);
    }
  }

  public static class Chars extends SampleElements<Character> {
    public Chars() {
      // elements aren't sorted, to better test SortedSet iteration ordering
      super('b', 'a', 'c', 'd', 'e');
    }
  }

  public static class Enums extends SampleElements<AnEnum> {
    public Enums() {
      // elements aren't sorted, to better test SortedSet iteration ordering
      super(AnEnum.B, AnEnum.A, AnEnum.C, AnEnum.D, AnEnum.E);
    }
  }

            }
        }
        return null;
    }

    private boolean isSafelyCacheable(RepositorySystemSession session, Artifact artifact) {
        /*
         * The workspace/reactor is in flux so we better not assume definitive information for any of its
         * artifacts/projects.
         */

        WorkspaceReader workspace = session.getWorkspaceReader();
        if (workspace == null) {

 * one can get a better result, as only a few registry suffixes are addressable. However, the most
 * useful test to determine if a domain is a plausible web host is {@link #hasPublicSuffix()}. This
 * will return {@code true} for many domains which (currently) are not hosts, such as {@code "com"},
 * but given that any public suffix may become a host without warning, it is better to err on the

    }

    @Override
    public CharMatcher and(CharMatcher other) {
      return other.matches(match) ? super.and(other) : other;
    }

    @Override
    public CharMatcher or(CharMatcher other) {
      return other.matches(match) ? any() : this;
    }

    @GwtIncompatible // used only from other GwtIncompatible code
    @Override
    void setBits(BitSet table) {

   *
   * <p><b>Performance note:</b> According to our
   * benchmarking
   * on Open JDK 7, {@link #immutableSortedCopy} generally performs better (in both time and space)
   * than this method, and this method in turn generally performs better than copying the list and
   * calling {@link Collections#sort(List)}.
   */
  // TODO(kevinb): rerun benchmarks including new options

    Builder<String, Integer> builder =
        new Builder<String, Integer>()
            .put("one", 1)
            .put("one", 1); // throwing on this line would be even better

    try {
      builder.build();
      fail();
    } catch (IllegalArgumentException expected) {
      assertThat(expected.getMessage()).contains("one");
    }
  }

  public void testOf() {

                "Inactive only ||${project.basedir}||",
                "<plugin-in-inactive-only>Inactive only ||${project.basedir}||</plugin-in-inactive-only>");
    }

    // Some better conventions for the test poms needs to be created and each of these tests
    // that represent a verification of a specification item needs to be a couple lines at most.