@CanIgnoreReturnValue
    @Override
    public boolean set(T t) {
      return super.set(t);
    }

    @CanIgnoreReturnValue
    @Override
    public boolean setException(Throwable t) {
      return super.setException(t);
    }
  }

  private static class OldAbstractFutureFacade<T> extends OldAbstractFuture<T>
      implements Facade<T> {