public void run() {
      // This prevents cancellation from propagating because we don't call setFuture(delegate) until
      // delegate is already done, so calling cancel() on this future won't affect it.
      @RetainedLocalRef ListenableFuture<V> localDelegate = delegate;
      if (localDelegate != null) {
        setFuture(localDelegate);
      }
    }

    @Override
    protected @Nullable String pendingToString() {