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

[Keith]

+1

Was surpised/dismayed that Backwards wasn't in base when I needed it for a project that doesn't expose its transitive dependency on transformers. It seems like fundamental part of Applicative.

--Keith

On November 26, 2019 8:55:05 AM UTC, Oleg Grenrus <oleg.grenrus at iki.fi> wrote:
>+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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