Well, mine does ( https://github.com/FeepingCreature/fcc ). I don't think it's very widespread, sadly.
Example: https://github.com/FeepingCreature/fcc/blob/master/tests/tes...
Example: https://github.com/FeepingCreature/fcc/blob/master/tests/tes...
For my language, I'll do some proper advertising on it once I figure out version two; v1 is very much a testbed for playing around with language design.