}

  static <I extends @Nullable Object, O extends @Nullable Object> ListenableFuture<O> create(
      ListenableFuture<I> input, Function<? super I, ? extends O> function, Executor executor) {
    TransformFuture<I, O> output = new TransformFuture<>(input, function);
    input.addListener(output, rejectionPropagatingExecutor(executor, output));
    return output;
  }

  /*

  }

  static <I extends @Nullable Object, O extends @Nullable Object> ListenableFuture<O> create(
      ListenableFuture<I> input, Function<? super I, ? extends O> function, Executor executor) {
    TransformFuture<I, O> output = new TransformFuture<>(input, function);
    input.addListener(output, rejectionPropagatingExecutor(executor, output));
    return output;
  }

  /*