LocalCache<Object, Object> map = makeLocalCache(createCacheBuilder().removalListener(listener));
    assertTrue(listener.isEmpty());

    Object one = new Object();
    Object two = new Object();
    Object three = new Object();
    Object four = new Object();
    Object five = new Object();
    Object six = new Object();

    map.put(one, two);
    map.remove(one);

    LocalCache<Object, Object> map = makeLocalCache(createCacheBuilder().removalListener(listener));
    assertTrue(listener.isEmpty());

    Object one = new Object();
    Object two = new Object();
    Object three = new Object();
    Object four = new Object();
    Object five = new Object();
    Object six = new Object();

    map.put(one, two);
    map.remove(one);

    final SettableFuture<Object> toReturn = SettableFuture.create();
    AsyncFunction<Object, Object> function =
        tagged(
            "Called my toString",
            new AsyncFunction<Object, Object>() {
              @Override
              public ListenableFuture<Object> apply(Object input) throws Exception {
                return toReturn;
              }

        @Override
        public ReferenceEntry<Object, Object> getEntry() {
          return null;
        }

        @Override
        public ValueReference<Object, Object> copyFor(
            ReferenceQueue<Object> queue,
            @CheckForNull Object value,
            ReferenceEntry<Object, Object> entry) {
          return this;
        }

        @Override
        public boolean isLoading() {

    final SettableFuture<Object> toReturn = SettableFuture.create();
    AsyncFunction<Object, Object> function =
        tagged(
            "Called my toString",
            new AsyncFunction<Object, Object>() {
              @Override
              public ListenableFuture<Object> apply(Object input) throws Exception {
                return toReturn;
              }

      return differences;
    }

    @Override
    public boolean equals(@CheckForNull Object object) {
      if (object == this) {
        return true;
      }
      if (object instanceof MapDifference) {
        MapDifference<?, ?> other = (MapDifference<?, ?>) object;
        return entriesOnlyOnLeft().equals(other.entriesOnlyOnLeft())

        @Override
        public ReferenceEntry<Object, Object> getEntry() {
          return null;
        }

        @Override
        public ValueReference<Object, Object> copyFor(
            ReferenceQueue<Object> queue,
            @CheckForNull Object value,
            ReferenceEntry<Object, Object> entry) {
          return this;
        }

        @Override
        public boolean isLoading() {

     */
    public interface ClosingFunction5<
        V1 extends @Nullable Object,
        V2 extends @Nullable Object,
        V3 extends @Nullable Object,
        V4 extends @Nullable Object,
        V5 extends @Nullable Object,
        U extends @Nullable Object> {
      /**
       * Applies this function to five inputs, or throws an exception if unable to do so.
       *