I've looked at their code for a few minutes in a few files, and while I don't know what they're trying to do well enough to say for sure anything is definitely a bug, I've already spotted several things that seem likely to be, and several others that I'd class as anti-patterns in rust. Don't get me wrong, as an experiment this is really cool, but I do not think they've succeeded in getting the "dark factory" concept to work where every other prominent attempt has fallen short.