[core libraries] Adding Backwards to base, re-export from Control.Applicative

[Oleg Grenrus]

+1 on adding.

Slight -0.5 on re-exporting from Control.Applicative. I think there 
should be a plan of not having both Backwards in Control.Applicative and 
Control.Applicative.Backwards. Maybe there's a plan for Const which is 
exported from Control.Applicative (historically) and Data.Functor.Const.

- Oleg

On 26.11.2019 2.49, George Wilson wrote:
> I support this.
> It would require coordinating with Ross Paterson, the maintainer of
> transformers.
>
> On Tue, 26 Nov 2019 at 09:58, Baldur Blöndal <baldurpet at gmail.com> wrote:
>> I'll CC Haskell Libraries
>>
>> þri., 12. nóv. 2019 kl. 22:14 skrifaði Ryan Scott <ryan.gl.scott at gmail.com>:
>>> This discussion definitely belongs on the mailing list, yes.
>>>
>>> Ryan
>>>
>>> On Tue, Nov 12, 2019 at 11:59 AM chessai . <chessai1996 at gmail.com> wrote:
>>>> I support this. +1
>>>>
>>>> Should we copy in the libraries mailing list?
>>>>
>>>> On Tue, Nov 12, 2019, 5:56 AM Baldur Blöndal <baldurpet at gmail.com> wrote:
>>>>> Is it time to move Control.Applicative.Backwards module from transformers to base, and maybe re-export it from Control.Applicative.
>>>>>
>>>>> It's an interesting, important, simple property of Applicative that they can be run backwards.
>>>>>
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