Predicate<@Nullable Integer> isFalse = Predicates.in(nums);
    assertFalse(isFalse.apply(null));
  }

  public void testIn_handlesClassCastException() {
    class CollectionThatThrowsCCE<T> extends ArrayList<T> {
      @J2ktIncompatible // Kotlin doesn't support companions for inner classes
      private static final long serialVersionUID = 1L;

      @Override