[QuickCheck] Positive instance is broken

[Bryan O'Sullivan]

On Sun, Jun 8, 2014 at 1:16 PM, Nick Smallbone <nicsma at chalmers.se> wrote:

> I think I'll have to do what I was trying to avoid, and remove the Num
> instance for Positive and friends entirely. It doesn't really make
> sense to have a numeric type without 0 in it. This means that your
> earlier bug report, about Small (Positive Int), will now fail to
> typecheck, but Positive (Small Int) will do the right thing.
>

Works for me. Thanks!
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