Questions et réponses pour le overlapping-instances :

Questions relatives à l'extension de GHC Haskell's `chevauchants»

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{-# LANGUAGE MultiParamTypeClasses #-} {-# LANGUAGE FlexibleInstances #-} {-# LANGUAGE FlexibleContexts #-} module OverlappingSpecificsError where class EqM a b where (===) :: a -> b -> ...