* @since 16.0
   */
  public static <K0 extends Enum<K0>> MultimapBuilderWithKeys<K0> enumKeys(Class<K0> keyClass) {
    checkNotNull(keyClass);
    return new MultimapBuilderWithKeys<K0>() {
      @SuppressWarnings("unchecked")
      @Override
      <K extends K0, V extends @Nullable Object> Map<K, Collection<V>> createMap() {
        // K must actually be K0, since enums are effectively final
        // (their subclasses are inaccessible)

        JobNotFoundException exception = new JobNotFoundException("test");

        // Simply verify the exception can be created without issues
        // The serialVersionUID is compile-time checked
        assertNotNull(exception);
    }

    @Test
    public void test_stackTrace() {
        // Test that stack trace is properly captured

            if (compileOnlyArtifacts.contains(dep.getGroup() + ":" + dep.getName() + ":" + dep.getVersion())) {
                continue;
            }

            // only external dependencies are checked
            if (dep instanceof ProjectDependency) {
                continue;
            }

            final String url = createURL(dep.getGroup(), dep.getName(), dep.getVersion());

            .withFeatures(CollectionSize.ANY, CollectionFeature.ALLOWS_NULL_VALUES)
            .createTestSuite());

    return suite;
  }

  @SuppressWarnings({"rawtypes", "unchecked"})
  public void testForwarding() {
    new ForwardingWrapperTester()
        .testForwarding(
            Collection.class,
            new Function<Collection, Collection>() {
              @Override

                CollectionFeature.ALLOWS_NULL_VALUES,
                CollectionFeature.GENERAL_PURPOSE)
            .createTestSuite());

    return suite;
  }

  @SuppressWarnings({"rawtypes", "unchecked"})
  public void testForwarding() {
    new ForwardingWrapperTester()
        .testForwarding(
            Queue.class,
            new Function<Queue, Queue>() {
              @Override

        },
        finishToValueAndCloserExecutor);
    assertWithMessage("valueAndCloser was set")
        .that(awaitUninterruptibly(valueAndCloserSet, 10, SECONDS))
        .isTrue();
    @SuppressWarnings("unchecked")
    ValueAndCloser<V> valueAndCloserWithType = (ValueAndCloser<V>) valueAndCloser;
    return valueAndCloserWithType;
  }

  private transient volatile @Nullable CacheEntry<K, V> cacheEntry2;

  MapRetrievalCache(Map<K, V> backingMap) {
    super(backingMap);
  }

  @SuppressWarnings("unchecked") // Safe because we only cast if key is found in map.
  @Override
  @Nullable V get(Object key) {
    checkNotNull(key);
    V value = getIfCached(key);
    if (value != null) {
      return value;
    }

     */
    public static <E> Iterable<E> iterable(final Iterable<E>... iterables) {
        assertArgumentNotNull("iterables", iterables);

        @SuppressWarnings("unchecked")
        final Iterator<E>[] iterators = new Iterator[iterables.length];
        for (int i = 0; i < iterables.length; ++i) {
            iterators[i] = iterables[i].iterator();
        }
        return iterable(iterators);

  }

  @Override
  public @Nullable Object[] toArray() {
    return ObjectArrays.toArrayImpl(this);
  }

  @Override
  @SuppressWarnings("nullness") // b/192354773 in our checker affects toArray declarations
  public <T extends @Nullable Object> T[] toArray(T[] a) {
    return ObjectArrays.toArrayImpl(this, a);
  }

  @Override
  public void clear() {
    if (needsAllocArrays()) {

  }

  @Override
  public @Nullable Object[] toArray() {
    return ObjectArrays.toArrayImpl(this);
  }

  @Override
  @SuppressWarnings("nullness") // b/192354773 in our checker affects toArray declarations
  public <T extends @Nullable Object> T[] toArray(T[] a) {
    return ObjectArrays.toArrayImpl(this, a);
  }

  @Override
  public Spliterator<E> spliterator() {