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Add Num instances to newtype wrappers #31

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phadej opened this issue May 16, 2016 · 2 comments

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phadej commented May 16, 2016

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tonyday567 commented Nov 4, 2019 •

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Can

instance (Num a) => Lattice a where
  a /\ b = a `min` b
  a \/ b = a `max` b

be included directly? It's an undecidable instance, but it looks like a benign one.

tonyday567 commented Nov 4, 2019

Ok, I see why, because of Overlapping Instances. So what's the best way to add Num instances?

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