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. On Wed, Aug 22, 2018, 7:45 AM Ben Gamari <b...@smart-cactus.org> wrote: > Simon Peyton Jones <simo...@microsoft.com> writes: > > > | Huh! It looks like what we currently do for some primops is just use a > > | totally bogus kind. For example, mkWeak# will happily accept an Int# > as > > | its first argument. > > > > Well, I see > > primop MkWeakOp "mkWeak#" GenPrimOp > > o -> b -> (State# RealWorld -> (# State# RealWorld, c #)) > > > > and I believe (from Ben's message) that the "o" means "open type > variable", > > which is the old terminology for what we now call levity-polymorphic. > > > Right; currently (largely for historical reasons) we use `o` to > accommodate cases that accept both lifted and unlifted pointers. > > Cheers, > > - Ben > >
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