Hello,Just read this post from Matthias Klumpp (http://blog.tenstral.net/2016/04/introducing-appstream-generator.html) in planet.debian.net where he talks about replacing the current appstream metadata generator written in python (dep11-generator).
He talks about considering Go, Rust and D for this task, and why He finally chose D. It's very short and very enlightening, worth a reading!
Hope you like it! Sorry if this has been posted before. Antonio