A new and awful implementation of Thierry Coquand et. al's Mini-TT language :)
also was helped a lot by this implementation as a reference
https://github.com/owo-lang/minitt-rs
The main algorithm is in tc.rkt, and there is some work that I'm doing to write some
documentation of what exactly is going on; but this was really fun to work on and
I have become, if only a little, slightly more confident in what the hell is going on with
type checking :)