Deprecate Foldable for Either

Henning Thielemann lemming at
Sat Mar 18 22:18:53 UTC 2017

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.

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