They show it on the landing page, but having first class support for CTF grammars is such an interesting niche for a language. Perl (Rake was originally Perl 6 if I recall) always had solid tooling for dealing with text manipulation, but adding context free grammars in directly is another level. I have to imagine it ends up being seldom used for a lot of applications, but I wonder if you end up with a "see nails when you have a hammer" situation (and not necessarily in a bad way).

I personally have never used a context free grammar outside of writing a programming language parser.