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

[Fumiaki Kinoshita]

Same as Edward; like Compose and Identity, I'm +1 to adding them into base
but -1 to reexporting.

2019年12月6日(金) 2:43 Edward Kmett <ekmett at gmail.com>:

> I’m a strong +1 on moving Backwards and Reverse to base. This is basically
> free for everybody for a nice consistency win.
>
> I’m -1 on exporting them from Control.Applicative. That module is imported
> unqualified by a significant cross section of the Haskell ecosystem, so
> this just gratuitously introduces risk of name conflicts for little
> tangible benefit. In the presence of possible conflicts there I’d err on
> the side of the status quo over change for change’s sake.
>
> The only real precedent for doing so is that Control.Applicative also
> gratuitously exports Const, which is more historical accident than
> precedent to follow.
>
> -Edward
>
> On Nov 27, 2019, at 1:36 PM, chessai . <chessai1996 at gmail.com> wrote:
>
> 
> I think that makes sense. It wouldn't be disruptive, both changes are
> small but useful.
>
> On Wed, Nov 27, 2019, 3:08 PM David Feuer <david.feuer at gmail.com> wrote:
>
>> If Backwards moves, then Reverse probably should too.
>>
>> On Mon, Nov 25, 2019, 6:58 PM 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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