if (ATOMIC_HELPER.casValue(this, null, valueToSet)) {
      complete(this, /*callInterruptTask=*/ false);
      return true;
    }
    return false;
  }

  /**
   * Sets the failed result of this {@code Future} unless this {@code Future} has already been
   * cancelled or set (including {@linkplain #setFuture set asynchronously}). When a call to this