[Haskell-cafe] Lenses that work with Arrows

Niklas Haas haskell
Mon Oct 7 17:14:44 UTC 2013

On Mon, 7 Oct 2013 10:40:13 +0100, Tom Ellis <tom-lists-haskell-cafe-2013 at jaguarpaw.co.uk> wrote:
> Dear all,
> I introduce a very simple extension to the Lens datatype from Control.Lens
> that allows it to work with Arrows:
>     https://gist.github.com/tomjaguarpaw/6865080
> I would particularly like to discuss this with authors of Control.Lens to
> see if such an idea is suitable for inclusion in their library.
> I have also started a Reddit discussion here:
>     http://www.reddit.com/r/haskell/comments/1nwetz/lenses_that_work_with_arrows/
> Tom
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The reason we don't tend to have combinators like ?view? or ?over?
generalized in their return profunctor like that is because you very
quickly run into type ambiguity issues.

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