Pre-Proposal: Add Validation somewhere easily accessible

[Edward Kmett]

There was some discussion of retiring Constant, as it is mostly unused, and
Const has supplanted it in common usage. It didn't happen with this last
release of transformers.

-Edward

On Mon, Sep 22, 2014 at 7:27 PM, Joseph Abrahamson <me at jspha.com> wrote:

> `Lift` is, but `Errors` should be identical, correct? It appears to work
> exactly as I would hope in my testing, anyway. The only difference is one
> further step unwrapping the Constant. Am I missing something major?
>
> Tangentially, I don’t understand why transformers defines its own Constant
> type, though, given Const in Applicative. At least in transformers 4.0 they
> use the built-in Eq1 classes and the like.
>
> Joseph
>
>
> On Mon, Sep 22, 2014 at 7:12 PM, Edward Kmett <ekmett at gmail.com> wrote:
>
>> Lift is rather different than Validation.
>>
>> On Mon, Sep 22, 2014 at 3:13 PM, Roman Cheplyaka <roma at ro-che.info>
>> wrote:
>>
>>> On 22/09/14 18:43, Andreas Abel wrote:
>>> > UPDATE: I found that "Errors e" on
>>> >
>>> >
>>> >
>>> https://hackage.haskell.org/package/transformers-0.4.1.0/docs/Control-Applicative-Lift.html
>>>
>>> Brilliant, thanks a lot! For me, having it in transformers outweighs all
>>> the benefits that a separate package may provide (especially a package
>>> as heavy as 'errors').
>>>
>>> Roman
>>>
>>>
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>>>
>>
>
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