@GwtIncompatible // TODO
  public static <I extends @Nullable Object, O extends @Nullable Object> Future<O> lazyTransform(
      final Future<I> input, final Function<? super I, ? extends O> function) {
    checkNotNull(input);
    checkNotNull(function);
    return new Future<O>() {

      @Override
      public boolean cancel(boolean mayInterruptIfRunning) {
        return input.cancel(mayInterruptIfRunning);
      }