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{-# LANGUAGE TypeFamilies #-}
module ShouldCompile where
class Cls a where
type Fam a :: *
type Fam a = Maybe a
instance Cls Int where
-- Overriding default
type Fam Int = Bool
nott :: (Fam a ~ Bool) => a -> Fam a -> Fam a
nott _proxy False = True
nott _proxy True = False
foo :: Bool -> Bool
foo = nott (undefined :: Int)
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