abstract void addInitialException(Set<Throwable> seen);

  final int decrementRemainingAndGet() {
    return ATOMIC_HELPER.decrementAndGetRemainingCount(this);
  }

  final void clearSeenExceptions() {
    seenExceptionsField = null;
  }

  @VisibleForTesting
  static String atomicHelperTypeForTest() {
    return ATOMIC_HELPER.atomicHelperTypeForTest();
  }

      boolean wasInterrupted = wasInterrupted();
      for (Future<?> future : localFutures) {
        future.cancel(wasInterrupted);
      }
    }
    /*
     * We don't call clearSeenExceptions() until processCompleted(). Prior to that, it may be needed
     * again if some outstanding input fails.
     */
  }

  @Override
  protected final @Nullable String pendingToString() {