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{-# LANGUAGE TypeFamilies, GeneralizedNewtypeDeriving #-}
module ShouldCompile where
import Control.Applicative (Applicative)
data family S a
newtype instance S Int = S Int
deriving Eq
data family S2 a b
newtype instance S2 Int b = S2 (IO b)
deriving (Functor, Applicative, Monad)
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