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{-# LANGUAGE TypeFamilies, StandaloneDeriving, FlexibleInstances #-}
module ShouldCompile where
data family T a
data instance T Int = A | B
deriving Eq
foo :: T Int -> Bool
foo x = x == x
data instance T Char = C
instance Eq (T Char) where
C == C = False
data family R a
data instance R [a] = R
deriving instance Eq (R [a])
class C a where
data S a
instance C Int where
data S Int = SInt deriving Eq
bar :: S Int -> Bool
bar x = x == x
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