@Override
    public String toString() {
      return "Functions.identity()";
    }
  }

  /**
   * Returns a function which performs a map lookup. The returned function throws an {@link
   * IllegalArgumentException} if given a key that does not exist in the map. See also {@link
   * #forMap(Map, Object)}, which returns a default value in this case.
   *

    @Override
    public String toString() {
      return "Functions.identity()";
    }
  }

  /**
   * Returns a function which performs a map lookup. The returned function throws an {@link
   * IllegalArgumentException} if given a key that does not exist in the map. See also {@link
   * #forMap(Map, Object)}, which returns a default value in this case.
   *

  }

  private static int decode(char ch) {
    if (ch >= '0' && ch <= '9') {
      return ch - '0';
    }
    if (ch >= 'a' && ch <= 'f') {
      return ch - 'a' + 10;
    }
    throw new IllegalArgumentException("Illegal hexadecimal character: " + ch);
  }

  /**
   * Returns {@code true} if {@code object} is a {@link HashCode} instance with the identical byte
   * representation to this hash code.
   *

    assertThat(set.subSet("g", "h")).isSameInstanceAs(this.<String>of());
    assertThat(set.subSet("c", "c")).isSameInstanceAs(this.<String>of());
    assertThrows(IllegalArgumentException.class, () -> set.subSet("e", "c"));
  }

  @J2ktIncompatible
  @GwtIncompatible // SerializableTester
  public void testOf_subSetSerialization() {
    SortedSet<String> set = of("e", "f", "b", "d", "c");

   * serializable if {@code e} is.
   *
   * @param e the element to be associated with the returned entry
   * @param n the count to be associated with the returned entry
   * @throws IllegalArgumentException if {@code n} is negative
   */
  public static <E extends @Nullable Object> Multiset.Entry<E> immutableEntry(
      @ParametricNullness E e, int n) {
    return new ImmutableEntry<>(e, n);
  }

   * serializable if {@code e} is.
   *
   * @param e the element to be associated with the returned entry
   * @param n the count to be associated with the returned entry
   * @throws IllegalArgumentException if {@code n} is negative
   */
  public static <E extends @Nullable Object> Multiset.Entry<E> immutableEntry(
      @ParametricNullness E e, int n) {
    return new ImmutableEntry<>(e, n);
  }

   *
   * @throws IllegalAccessException if this {@code Constructor} object enforces Java language access
   *     control and the underlying method or constructor is inaccessible.
   * @throws IllegalArgumentException if the number of actual and formal parameters differ; if an
   *     unwrapping conversion for primitive arguments fails; or if, after possible unwrapping, a

  }

  /**
   * Unregisters all subscriber methods on a registered {@code object}.
   *
   * @param object object whose subscriber methods should be unregistered.
   * @throws IllegalArgumentException if the object was not previously registered.
   */
  public void unregister(Object object) {
    subscribers.unregister(object);
  }

  /**

        // consistent state by removing the bad entry.
        itr.remove();
      }
    }
    if (broken != null) {
      throw new IllegalArgumentException("value already present: " + broken.getValue());
    }
  }

  @Override
  public void clear() {
    delegate.clear();
    inverse.delegate.clear();
  }

  // Views

  @Override

  @J2ktIncompatible
  @GwtIncompatible // reflection
  public static Method getMethod(Class<?> clazz, String name) {
    try {
      return clazz.getMethod(name);
    } catch (Exception e) {
      throw new IllegalArgumentException(e);
    }
  }

  /**
   * Useless constructor for a class of static utility methods.
   *
   * @deprecated Do not instantiate this utility class.
   */
  @Deprecated