Unlifted primop types

[David Feuer]

On Monday, August 20, 2018 12:11:14 PM EDT Simon Peyton Jones via ghc-devs wrote:
> I don’t quite know how primops.txt.pp is processed, but perhaps by utils/genprimopcode.   You may need to update the syntax a bit?

The whole thing is a mystery to me. Whatever it's doing seems to generate code that puts things in TysPrim.hs together, and that module also looks rather murky to the uninitiated.