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Override instances used by Haskell's generic derivation
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Standalone deriving without boiler-plate
Write short and concise contexts based on generics.
Instead of writing boiler-plate standalone deriving clauses in the form of
deriving instance [Various Eq Constraints Here] => Instance Eq MyType
With generic-constraints you can use
deriving instance Constraints MyType Eq => Eq MyType
Or, using TH, simply
makeDeriving ''Eq ''MyType
And for several classes and types:
makeDerivings [''Eq, ''Ord, ''Show] [''MyType, ''MyOtherType]
This library was extracted from the one-liner library by Sjoerd Visscher and Xia Li-yao.