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{-# LANGUAGE GeneralizedNewtypeDeriving, TypeFamilies, FlexibleContexts, FlexibleInstances #-}
module T2850 where
class K a where
bar :: a -> a
class K (B a) => M a where
data B a :: *
foo :: B a -> B a
instance M Bool where
data B Bool = B1Bool Bool | B2Bool Bool
foo = id
instance K (B Bool) where
bar = id
instance M Int where
newtype B Int = BInt (B Bool) deriving K
foo = id
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