Unlifted primop types

[Ben Gamari]

David Feuer <david.feuer at gmail.com> writes:

> The problem is that this also accepts things that aren't pointers at all!
> We could fix that *for primops* by changing RuntimeRep to something like
>
> data RuntimeRep
>   = PtrRep Liftedness
>    | ...
>
> But that would only work for primops (at least for now) so it may not be
> worth the breakage.
>
The runtime rep design was precisely this but IIRC this was changed
since the additional polymorphism ended up costing quite a bit in
type-checking effort.

Cheers,

- Ben
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