* description of the returned view's behavior.
   *
   * <p><b>Warning:</b> {@code Range}s always represent a range of values using the values' natural
   * ordering. {@code NavigableSet} on the other hand can specify a custom ordering via a {@link
   * Comparator}, which can violate the natural ordering. Using this method (or in general using
   * {@code Range}) with unnaturally-ordered sets can lead to unexpected and undefined behavior.
   *

      return this;
    }

    @Override
    public CharMatcher negate() {
      return new NegatedFastMatcher(this);
    }
  }

  /** {@link FastMatcher} which overrides {@code toString()} with a custom name. */
  abstract static class NamedFastMatcher extends FastMatcher {

    private final String description;

    NamedFastMatcher(String description) {
      this.description = checkNotNull(description);

    }
  }

  final class ValueIterator extends HashIterator<V> {

    @Override
    public V next() {
      return nextEntry().getValue();
    }
  }

  /**
   * Custom Entry class used by EntryIterator.next(), that relays setValue changes to the underlying
   * map.
   */
  final class WriteThroughEntry extends AbstractMapEntry<K, V> {
    final K key; // non-null

  /*
   * We avoid using a method reference or lambda here for now:
   *
   * - method reference: Inside Google, CacheBuilder is used from the implementation of a custom
   *   ClassLoader that is sometimes used as a system classloader. That's a problem because
   *   method-reference linking tries to look up the system classloader, and it fails because there
   *   isn't one yet.
   *

      return this;
    }

    @Override
    public CharMatcher negate() {
      return new NegatedFastMatcher(this);
    }
  }

  /** {@link FastMatcher} which overrides {@code toString()} with a custom name. */
  abstract static class NamedFastMatcher extends FastMatcher {

    private final String description;

    NamedFastMatcher(String description) {
      this.description = checkNotNull(description);

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