this.inputFuture = null;
    this.function = null;
  }

  @Override
  protected @Nullable String pendingToString() {
    @RetainedLocalRef ListenableFuture<? extends I> localInputFuture = inputFuture;
    @RetainedLocalRef F localFunction = function;
    String superString = super.pendingToString();
    String resultString = "";
    if (localInputFuture != null) {

    this.inputFuture = null;
    this.function = null;
  }

  @Override
  protected @Nullable String pendingToString() {
    @RetainedLocalRef ListenableFuture<? extends I> localInputFuture = inputFuture;
    @RetainedLocalRef F localFunction = function;
    String superString = super.pendingToString();
    String resultString = "";
    if (localInputFuture != null) {

  }

  public void testToString_notDone() throws Exception {
    AbstractFuture<Object> testFuture =
        new AbstractFuture<Object>() {
          @Override
          public String pendingToString() {
            return "cause=[Because this test isn't done]";
          }
        };
    assertThat(testFuture.toString())
        .matches(

     * again if some outstanding input fails.
     */
  }

  @Override
  protected final @Nullable String pendingToString() {
    @RetainedLocalRef ImmutableCollection<? extends Future<?>> localFutures = futures;
    if (localFutures != null) {
      return "futures=" + localFutures;
    }
    return super.pendingToString();
  }

  /**
   * Must be called at the end of each subclass's constructor. This method performs the "real"

  }

  public void testToString_notDone() throws Exception {
    AbstractFuture<Object> testFuture =
        new AbstractFuture<Object>() {
          @Override
          public String pendingToString() {
            return "cause=[Because this test isn't done]";
          }
        };
    assertThat(testFuture.toString())
        .matches(