warp: a fast C and C++ preprocessor

[Meta]

On Friday, 28 March 2014 at 18:27:17 UTC, Andrei Alexandrescu 
wrote:
> Facebook is open-sourcing warp, a fast C and C++ preprocessor 
> written by Walter Bright.
>
> http://www.reddit.com/r/programming/comments/21m0bz/warp_a_fast_c_and_c_preprocessor/
>
> https://news.ycombinator.com/newest
>
> https://twitter.com/fbOpenSource/status/449611378219679744
>
> https://www.facebook.com/dlang.org/posts/10202207506322611?stream_ref=10
>
>
> Andrei

Is Warp written in D? I don't think it was made clear in the 
article.