I may have misread, but it seems like Errors is isomorphic to Validation. Nonetheless, I'd still support having something like Validation in the either package, as I'm certain the error messages that would result from using Errors would be atrocious, making it a non-starter for many use cases.

On Tue, Sep 23, 2014 at 2:12 AM, Edward Kmett <ekmett@gmail.com> wrote:
Lift is rather different than Validation.

On Mon, Sep 22, 2014 at 3:13 PM, Roman Cheplyaka <roma@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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