Discussion: Allow custom constraint for elem in Foldable

Niklas Hamb├╝chen mail at nh2.me
Thu Jul 27 23:37:50 UTC 2017


On 28/07/17 00:45, David Feuer wrote:
> Unfortunately, this is really awful for sets, hash maps, etc. 
If this is done at some point, I suppose we could fix `nub` in the same way?


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