OK, so I sat down today and tried this, but I can't figure out how.
There are various examples of type-level arithmetic around the place.
For example,
http://www.haskell.org/haskellwiki/Type_arithmetic
(This is THE first hit on Google, by the way. Haskell is apparently THAT
popular!) But this does type arithmetic using functional dependencies;
what I'm trying to figure out is how to do that with associated types.
Any hints?
(I know for a fact that other people have done this - rule 34 requires it.)
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