Some of them never worked, like `iter` or `sweet-expressions`, because I haven't implemented that functionality yet. I still wanted the tests there so when I do implement them, I'll be able to get a quick yes/no as to whether Arubic matches the expectations or not.
Some of them, however, used to work and now don't. `macex` is an example of that. In the case of macex, the problem is that I changed Arubic, but didn't update the tests... they're out of sync. So it's commented out until I clean it up.
