I think you'll find the correct term is "Rustacean". This is a Rustilian:
This is a Rustacean:
Lookit 'im. 'e wouldn't hurt anyone. Note the protective type-system shell, guarding against a cruel, heartless world that just wants to crush him with the proverbial sledgehammer of memory unsafety. 'ee's a clever little crab, yes 'e is.
Seriously, though; this is damned cool. The only problem I can see is that it's going to be hard to sandbox. I mean, ideally, you could separate it into two phases: acquire dependencies, and test. That way, the "acquire dependencies" part should be safe, and then you can more aggressively lock down the "test" part.
Also, the last time I tried to find out how to effectively sandbox programs on Windows, I just found an endless parade of dead ends and madness. It's probably out of scope, but it would be fantastic if there were pointers on how to sandbox crusader. Otherwise, it runs the dual risks of being used to compromise systems or not being used because it's scary.