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

[Mario Blažević]

On 07/23/2015 07:18 PM, Edward Kmett wrote:
> ...
> So, as a concrete proposal I propose that we:
>
> 1.) Move Data.Functor.Sum, Data.Functor.Product, Data.Functor.Compose 
> and Data.Functor.Classes into base.
>
> 2.) Move Control.Applicative's Const into Data.Functor.Const, but 
> continue to re-export it from Control.Applicative.
>
> 3.) Add whatever missing, sensible, instances make sense after the 
> transition that were ruled out by these modules' previous placement. 
> /e.g./ Data, Generic, Generic1.

+1 to all three parts