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

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 :

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 . 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 wrote:

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If Backwards moves, then Reverse probably should too.

On Mon, Nov 25, 2019, 6:58 PM Baldur Blöndal wrote:

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I'll CC Haskell Libraries

þri., 12. nóv. 2019 kl. 22:14 skrifaði Ryan Scott < ryan.gl.scott@gmail.com>:

...

This discussion definitely belongs on the mailing list, yes.

Ryan

On Tue, Nov 12, 2019 at 11:59 AM chessai . wrote:

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I support this. +1

Should we copy in the libraries mailing list?

On Tue, Nov 12, 2019, 5:56 AM Baldur Blöndal wrote:

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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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