* ImmutableRangeSet}. As in {@link Builder}, overlapping ranges are not permitted and adjacent
   * ranges will be merged.
   *
   * @since 33.2.0 (available since 23.1 in guava-jre)
   */
  @IgnoreJRERequirement // Users will use this only if they're already using streams.
  public static <E extends Comparable<? super E>>
      Collector<Range<E>, ?, ImmutableRangeSet<E>> toImmutableRangeSet() {

    assertThrows(IllegalStateException.class, () -> builder2.softValues());
    assertThrows(IllegalStateException.class, () -> builder2.weakValues());
  }

  @GwtIncompatible // Duration
  @IgnoreJRERequirement // No more dangerous than wherever the caller got the Duration from
  public void testLargeDurationsAreOk() {
    Duration threeHundredYears = Duration.ofDays(365 * 300);
    CacheBuilder<Object, Object> unused =

   * from the {@code Collector} returned by {@link Collectors#toMap(Function, Function)}, which
   * throws an {@code IllegalStateException}.)
   *
   * @since 33.2.0 (available since 21.0 in guava-jre)
   */
  @IgnoreJRERequirement // Users will use this only if they're already using streams.
  public static <T extends @Nullable Object, K, V>
      Collector<T, ?, ImmutableMap<K, V>> toImmutableMap(
          Function<? super T, ? extends K> keyFunction,

  /**
   * Returns a {@code Collector} that accumulates the input elements into a new {@code
   * ImmutableList}, in encounter order.
   *
   * @since 33.2.0 (available since 21.0 in guava-jre)
   */
  @IgnoreJRERequirement // Users will use this only if they're already using streams.
  public static <E> Collector<E, ?, ImmutableList<E>> toImmutableList() {
    return CollectCollectors.toImmutableList();
  }

  /**

   * @param scheduledExecutor The executor service to enforce the timeout.
   * @since 33.4.0 (but since 28.0 in the JRE flavor)
   */
  @J2ktIncompatible
  @GwtIncompatible // ScheduledExecutorService
  @IgnoreJRERequirement // Users will use this only if they're already using Duration.
  public final FluentFuture<V> withTimeout(
      Duration timeout, ScheduledExecutorService scheduledExecutor) {

  /** {@link AtomicHelper} based on {@link VarHandle}. */
  @J2ObjCIncompatible
  // We use this class only after confirming that VarHandle is available at runtime.
  @SuppressWarnings("Java8ApiChecker")
  @IgnoreJRERequirement
  private static final class VarHandleAtomicHelper extends AtomicHelper {
    static final VarHandle waiterThreadUpdater;
    static final VarHandle waiterNextUpdater;
    static final VarHandle waitersUpdater;

    }

    @Override
    /*
     * This is an override that is not directly visible to callers, so NewApi will catch calls to
     * Collection.spliterator() where necessary.
     */
    @IgnoreJRERequirement
    public Spliterator.OfInt spliterator() {
      return Spliterators.spliterator(array, start, end, 0);
    }

    @Override
    public boolean contains(@Nullable Object target) {

    },
    @J2ObjCIncompatible
    CRC_32C("Hashing.crc32c()") {
      // Crc32CSupplier.pickFunction uses this only when it finds that CRC32C is available.
      @SuppressWarnings("Java8ApiChecker")
      @IgnoreJRERequirement
      @Override
      public Checksum get() {
        return new CRC32C();
      }
    },
    ADLER_32("Hashing.adler32()") {
      @Override
      public Checksum get() {

    }

    @Override
    /*
     * This is an override that is not directly visible to callers, so NewApi will catch calls to
     * Collection.spliterator() where necessary.
     */
    @IgnoreJRERequirement
    public Spliterator.OfLong spliterator() {
      return Spliterators.spliterator(array, start, end, 0);
    }

    @Override
    public boolean contains(@Nullable Object target) {

   * ImmutableSetMultimap#toImmutableSetMultimap} or {@link
   * ImmutableListMultimap#toImmutableListMultimap}.
   *
   * @since 33.2.0 (available since 21.0 in guava-jre)
   */
  @IgnoreJRERequirement // Users will use this only if they're already using streams.
  public static <
          T extends @Nullable Object,
          K extends @Nullable Object,
          V extends @Nullable Object,