}
    }

    this.task = null;
  }

  @Override
  protected @Nullable String pendingToString() {
    InterruptibleTask<?> localTask = task;
    if (localTask != null) {
      return "task=[" + localTask + "]";
    }
    return super.pendingToString();
  }

  @WeakOuter
  private final class TrustedFutureInterruptibleTask extends InterruptibleTask<V> {

      setStackTrace(new StackTraceElement[0]);
      return this; // no stack trace, wouldn't be useful anyway
    }
  }

  @Override
  protected @Nullable String pendingToString() {
    @RetainedLocalRef ListenableFuture<? extends V> localInputFuture = delegateRef;
    @RetainedLocalRef ScheduledFuture<?> localTimer = timer;
    if (localInputFuture != null) {