{-# LANGUAGE EmptyDataDecls, KindSignatures #-} -- | -- What is tested here: -- -- Due to a change in GHC 7.6.1 we had a bug that superclass contraints were -- included in the instances list. Edward K. repported it here: -- -- <http://www.haskell.org/pipermail/haskell-cafe/2012-September/103600.html> -- -- And here is the corresponding thread on glasgow-haskell-users: -- -- <http://www.haskell.org/pipermail/glasgow-haskell-users/2012-September/022914.html> -- -- It has been fixed in: -- -- > 6ccf78e15a525282fef61bc4f58a279aa9c21771 -- > Fix spurious superclass constraints bug. -- module SpuriousSuperclassConstraints where import Control.Applicative data SomeType (f :: * -> *) a instance Functor (SomeType f) where fmap = undefined instance Applicative f => Applicative (SomeType f) where pure = undefined (<*>) = undefined