[Haskell-cafe] Partial instance of a class

[Clinton Mead]

I’ve implemented a drop in replacement enum class here, which solves your
issue among other things:

https://hackage.haskell.org/package/generic-enum

If it doesn’t have some of the instances you require feel free to send me a
pull request.

On Tue, 27 Feb 2018 at 8:12 am, Will Yager <will.yager at gmail.com> wrote:

> To avoid the hellish nightmare of Java’s
> UnsupportedOperationException-riddled ecosystem, I think we should *very
> strongly* discourage partial implementations of typeclasses as much as
> humanly possible. If a type doesn’t fit the typeclass, please don’t pretend
> it does.
>
> If it turns out that our typeclasses are divided along bad semantic
> boundaries (which they clearly are in some cases), we should fix that
> instead of turning the typeclass landscape into a minefield.
>
> —Will
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