}
  }

  /** Implementation of {@link #flatMapToInt}. */
  static final class FlatMapSpliteratorOfInt<InElementT extends @Nullable Object>
      extends FlatMapSpliteratorOfPrimitive<InElementT, Integer, IntConsumer, Spliterator.OfInt>
      implements Spliterator.OfInt {
    FlatMapSpliteratorOfInt(
        @CheckForNull Spliterator.OfInt prefix,
        Spliterator<InElementT> from,