[Haskell-cafe] Introducing Instances in GHC point releases

[Don Stewart]

duncan.coutts:
> What we're currently missing is a PVP checker: a tool to compare APIs of
> package versions and check that it is following the PVP. Ideally, we
> will have packages opt-in to follow the PVP for those packages that do
> opt-in we have the PVP enforced on hackage using the checker tool. Since
> the HP is almost certainly going to require packages to follow the PVP
> then this should eliminate this class of mistakes. But it does need the
> tool, and nobody is working on that at the moment.

If I recall correct, CosmicRay wrote just such a thing (or similar to
it) a while ago.

John?

-- Don