Deprecate Foldable for Either

[Tony Morris]

I will fork the compiler before I endure that degree of failure.


On 19/03/17 08:21, David Feuer wrote:
> I'm +1 on offering the warning and very very -1 on including it in -Wall.
>
> On Mar 18, 2017 6:19 PM, "Henning Thielemann"
> <lemming at henning-thielemann.de <mailto:lemming at henning-thielemann.de>>
> wrote:
>
>
>     On Sat, 18 Mar 2017, Lana Black wrote:
>
>         On 18/03/17 19:49, Henning Thielemann wrote:
>
>
>             On Sat, 18 Mar 2017, Carter Schonwald wrote:
>
>                 for what?
>
>
>             A warning if someone e.g. calls 'length (a,b)', or more
>             generally, if
>             certain instances are used.
>
>
>         Please no. Many of us like our code Wall-clean while still
>         being able to
>         write polymorphic functions.
>
>
>     Whether the warning is enabled by Wall is a different question.
>     Though I think it should.
>
>     https://ghc.haskell.org/trac/ghc/ticket/11796
>     <https://ghc.haskell.org/trac/ghc/ticket/11796>
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