return this;
  }

  /**
   * Advances the ticker value by {@code duration}.
   *
   * @since 28.0
   */
  @GwtIncompatible
  @J2ktIncompatible
  @CanIgnoreReturnValue
  @SuppressWarnings("Java7ApiChecker") // guava-android can rely on library desugaring now.
  public FakeTicker advance(Duration duration) {
    return advance(duration.toNanos());
  }

  /**

    NullPointerTester tester = new NullPointerTester();
    tester.testAllPublicInstanceMethods(new FakeTicker());
  }

  @GwtIncompatible // java.time.Duration
  @SuppressWarnings("Java7ApiChecker") // guava-android can rely on library desugaring now.
  @IgnoreJRERequirement // TODO: b/288085449 - Remove this once we use library-desugaring scents.
  public void testAdvance() {
    FakeTicker ticker = new FakeTicker();

    checkExpiration(countingSupplier, memoizedSupplier);
  }

  @J2ktIncompatible
  @GwtIncompatible // Thread.sleep
  @SuppressWarnings("Java7ApiChecker") // test of Java 8+ API
  public void testMemoizeWithExpiration_duration() throws InterruptedException {
    CountingSupplier countingSupplier = new CountingSupplier();

    Supplier<Integer> memoizedSupplier =

    checkExpiration(countingSupplier, memoizedSupplier);
  }

  @J2ktIncompatible
  @GwtIncompatible // Thread.sleep
  @SuppressWarnings("Java7ApiChecker") // test of Java 8+ API
  public void testMemoizeWithExpiration_duration() throws InterruptedException {
    CountingSupplier countingSupplier = new CountingSupplier();

    Supplier<Integer> memoizedSupplier =

    NullPointerTester tester = new NullPointerTester();
    tester.testAllPublicInstanceMethods(new FakeTicker());
  }

  @GwtIncompatible // java.time.Duration
  @SuppressWarnings("Java7ApiChecker") // guava-android can rely on library desugaring now.
  public void testAdvance() {
    FakeTicker ticker = new FakeTicker();
    assertEquals(0, ticker.read());
    assertSame(ticker, ticker.advance(10));

   *
   * <p><b>Warning:</b> {@code comparator} should be <i>consistent with {@code equals}</i> as
   * explained in the {@link Comparator} documentation.
   */
  @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
  @IgnoreJRERequirement // Users will use this only if they're already using streams.
  static <E> Collector<E, ?, ImmutableSortedMultiset<E>> toImmutableSortedMultiset(
      Comparator<? super E> comparator) {

    "GoodTime-ApiWithNumericTimeUnit",
    "GoodTime-DecomposeToPrimitive",
    // We use this method only from within APIs that require a Duration.
    "Java7ApiChecker",
  })
  @IgnoreJRERequirement
  static long toNanosSaturated(Duration duration) {
    // Using a try/catch seems lazy, but the catch block will rarely get invoked (except for

    "GoodTime-ApiWithNumericTimeUnit",
    "GoodTime-DecomposeToPrimitive",
    // We use this method only from within APIs that require a Duration.
    "Java7ApiChecker",
  })
  @IgnoreJRERequirement
  static long toNanosSaturated(Duration duration) {
    // Using a try/catch seems lazy, but the catch block will rarely get invoked (except for

   *     href="https://github.com/google/guava#guava-google-core-libraries-for-java">flavor</a>)
   */
  @GwtIncompatible
  @J2ktIncompatible
  @CanIgnoreReturnValue
  @SuppressWarnings("Java7ApiChecker") // guava-android can rely on library desugaring now.
  @IgnoreJRERequirement // TODO: b/288085449 - Remove this once we use library-desugaring scents.

 * with a {@code com.google.common} type.
 *
 * @author Louis Wasserman
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
@SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})
@IgnoreJRERequirement // Users will use this only if they're already using streams.
final class MoreCollectors {

  /*
   * TODO(lowasser): figure out if we can convert this to a concurrent AtomicReference-based