Haskell Foldable Wats

Henning Thielemann lemming at henning-thielemann.de
Tue Mar 22 09:20:51 UTC 2016

On Wed, 24 Feb 2016, Chris Allen wrote:

> You can't not-include the instances because we'll just end up with orphans so that's not cricket I think.

We could define

   instance Impossible a => Functor ((,,) a b) where

where Impossible is a non exported class.

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