RFC for a change in EmptyDataDecls instance deriving

David Feuer david.feuer at gmail.com
Thu Jul 16 03:28:03 UTC 2015

It's all a bit weird. I think the Proxy instance is lazy too. I would tend
to think that empty types shouldn't have these instances, and that if they
do that should be strict (empty case), but I can't prove that's the right
On Jul 15, 2015 5:53 PM, "Sven Panne" <svenpanne at gmail.com> wrote:

> 2015-07-15 19:55 GMT+02:00 Erik Hesselink <hesselink at gmail.com>:
>> [..] 3) I have no idea. What's the rationale behind returning True when
>> comparing two Voids? [...]
> Hmmm, what's the rationale of throwing an exception? I can imagine True,
> False, throwing an exception etc., but I can't see a reason why one should
> be "better" or "more natural" than the other.
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