ListenableFuture<List<String>> compound = successfulAsList(future1, future2, future3);
    compound.addListener(listener, directExecutor());

    // First is cancelled, second fails, third succeeds
    assertFalse(compound.isDone());
    future1.cancel(true);
    assertFalse(compound.isDone());
    future2.setException(new Throwable("failed2"));
    assertFalse(compound.isDone());

    ListenableFuture<List<String>> compound = successfulAsList(future1, future2, future3);
    compound.addListener(listener, directExecutor());

    // First is cancelled, second fails, third succeeds
    assertFalse(compound.isDone());
    future1.cancel(true);
    assertFalse(compound.isDone());
    future2.setException(new Throwable("failed2"));
    assertFalse(compound.isDone());

      return key.hashCode() ^ value.hashCode();
    }

    @Override
    public V setValue(V newValue) {
      V oldValue = put(key, newValue);
      value = newValue; // only if put succeeds
      return oldValue;
    }

    @Override
    public String toString() {
      return getKey() + "=" + getValue();
    }
  }

    return new ClosingFuture<>(future);
  }

  /**
   * Starts a {@link ClosingFuture} pipeline with a {@link ListenableFuture}.
   *
   * <p>If {@code future} succeeds, its value will be closed (using {@code closingExecutor)}) when
   * the pipeline is done, even if the pipeline is canceled or fails.
   *

      return key.hashCode() ^ value.hashCode();
    }

    @Override
    public V setValue(V newValue) {
      V oldValue = put(key, newValue);
      value = newValue; // only if put succeeds
      return oldValue;
    }

    @Override
    public String toString() {
      return getKey() + "=" + getValue();
    }
  }