* ExecutionException} and {@link RuntimeException}), both immediate and delayed. We use each
   * possible pair of these futures in {@link FuturesTest#runExtensiveMergerTest}.
   *
   * <p>Each test requires a new {@link TestFutureBatch} because we need new delayed futures each
   * time, as the old delayed futures were completed as part of the old test.
   */
  @J2ktIncompatible

   * ExecutionException} and {@link RuntimeException}), both immediate and delayed. We use each
   * possible pair of these futures in {@link FuturesTest#runExtensiveMergerTest}.
   *
   * <p>Each test requires a new {@link TestFutureBatch} because we need new delayed futures each
   * time, as the old delayed futures were completed as part of the old test.
   */
  @J2ktIncompatible