Proposal: Migrate Data.Functor.{Sum, Product, Compose} from transformers to base.

Edward Kmett ekmett at
Fri Jul 24 12:30:44 UTC 2015

Enabling PolyKinds is actually one motivation for doing the move in the
first place. It changes nothing about the modules involved when used in
code that doesn't turn on the extension.


On Fri, Jul 24, 2015 at 3:08 AM, Marcin Mrotek <marcin.jan.mrotek at>

> Does it count as bikeshedding if I'd suggest to make them polykinded?
> I think Vinyl would benefit from this:
> Best regards,
> Marcin Mrotek
> _______________________________________________
> Libraries mailing list
> Libraries at
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