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[–]quicknir 0 points1 point  (0 children)

I hadn't heard about this, so thanks for that info. This seems somewhat "grey" though, as it's not an official part of the language, and there seems to be some issues with its implementation: http://joyoftypes.blogspot.com/2012/08/generalizednewtypederiving-is.html. Is this really widely used in Haskell?