}

  /**
   * Waits until the given predicate returns true, invoking the garbage collector as necessary to
   * try to ensure that this will happen.
   *
   * @throws RuntimeException if timed out or interrupted while waiting
   */
  @SuppressWarnings("removal") // b/260137033
  public static void awaitDone(FinalizationPredicate predicate) {
    if (predicate.isDone()) {
      return;
    }

      Predicate<E> combinedPredicate = Predicates.and(filtered.predicate, predicate);
      return new FilteredSet<>((Set<E>) filtered.unfiltered, combinedPredicate);
    }

    return new FilteredSet<>(checkNotNull(unfiltered), checkNotNull(predicate));
  }

  /**
   * Returns the elements of a {@code SortedSet}, {@code unfiltered}, that satisfy a predicate. The

    return Sets.newTreeSet(contents);
  }

  @Override
  NavigableSet<Integer> filter(
      NavigableSet<Integer> elements, Predicate<? super Integer> predicate) {
    return Sets.filter(elements, predicate);
  }

  @Override
  Set<Integer> createUnfiltered(Iterable<Integer> contents) {
    return newHashSet(contents);
  }

  @Override
  Set<Integer> filter(Set<Integer> elements, Predicate<? super Integer> predicate) {
    return Sets.filter(elements, predicate);
  }

      extends ViewCachingAbstractMap<K, V> {
    final Map<K, V> unfiltered;
    final Predicate<? super Entry<K, V>> predicate;

    AbstractFilteredMap(Map<K, V> unfiltered, Predicate<? super Entry<K, V>> predicate) {
      this.unfiltered = unfiltered;
      this.predicate = predicate;
    }

    boolean apply(@Nullable Object key, @ParametricNullness V value) {

      extends ViewCachingAbstractMap<K, V> {
    final Map<K, V> unfiltered;
    final Predicate<? super Entry<K, V>> predicate;

    AbstractFilteredMap(Map<K, V> unfiltered, Predicate<? super Entry<K, V>> predicate) {
      this.unfiltered = unfiltered;
      this.predicate = predicate;
    }

    boolean apply(@Nullable Object key, @ParametricNullness V value) {

      }
    };
  }

  private static final ImmutableMultiset<String> ELEMENTS_TO_FILTER_OUT =
      ImmutableMultiset.of("foobar", "bazfoo", "foobar", "foobar");

  private static final Predicate<String> PREDICATE = not(Predicates.in(ELEMENTS_TO_FILTER_OUT));

  private static TestStringMultisetGenerator filteredGenerator() {
    return new TestStringMultisetGenerator() {
      @Override

    Iterable<A> aIterable = ImmutableList.of();
    Iterable<B> bIterable = ImmutableList.of();

    Predicate<X> xPredicate = Predicates.alwaysTrue();
    Predicate<Y> yPredicate = Predicates.alwaysTrue();

    FluentIterable<?> unused =
        FluentIterable.concat(aIterable, bIterable).filter(xPredicate).filter(yPredicate);

    /* The following fails to compile:
     *

  }

  private static final class FilteredMultiset<E extends @Nullable Object> extends ViewMultiset<E> {
    final Multiset<E> unfiltered;
    final Predicate<? super E> predicate;

    FilteredMultiset(Multiset<E> unfiltered, Predicate<? super E> predicate) {
      this.unfiltered = checkNotNull(unfiltered);
      this.predicate = checkNotNull(predicate);
    }

    @Override

      Class<T> expectedThrowable, ThrowingSupplier supplier, boolean userPassedSupplier) {
    checkNotNull(expectedThrowable);
    checkNotNull(supplier);
    Predicate<Throwable> predicate = INSTANCE_OF.get(expectedThrowable);
    if (predicate == null) {
      throw new IllegalArgumentException(
          expectedThrowable
              + " is not yet supported by ReflectionFreeAssertThrows. Add an entry for it in the"