* @since 30.0
   */
  @J2ktIncompatible
  @GwtIncompatible // concurrency
  public static void awaitTerminationUninterruptibly(ExecutorService executor) {
    // TODO(cpovirk): We could optimize this to avoid calling nanoTime() at all.
    verify(awaitTerminationUninterruptibly(executor, Long.MAX_VALUE, NANOSECONDS));
  }

  /**
   * Invokes {@code executor.}{@link ExecutorService#awaitTermination(long, TimeUnit)

    }

    @GwtIncompatible @J2ktIncompatible private static final long serialVersionUID = 0;
  }

  /**
   * Returns a supplier whose {@code get()} method synchronizes on {@code delegate} before calling
   * it, making it thread-safe.
   */
  @J2ktIncompatible
  public static <T extends @Nullable Object> Supplier<T> synchronizedSupplier(
      Supplier<T> delegate) {
    return new ThreadSafeSupplier<>(delegate);

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  - [Changes by Kind](#changes-by-kind-14)
    - [Deprecation](#deprecation-1)
    - [API Change](#api-change-2)
    - [Feature](#feature-10)
    - [Failing Test](#failing-test)
    - [Bug or Regression](#bug-or-regression-14)
    - [Other (Cleanup or Flake)](#other-cleanup-or-flake-7)
  - [Dependencies](#dependencies-14)
    - [Added](#added-14)
    - [Changed](#changed-14)

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