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+{-# LANGUAGE TypeFamilies #-}
+
+module TypeFamilies where
+
+-- | Type family G
+type family G a :: *
+
+-- | A class with an associated type
+class A a where
+ -- | An associated type
+ data B a :: * -> *
+ -- | A method
+ f :: B a Int
+
+-- | Doc for family
+type family F a
+
+
+-- | Doc for G Int
+type instance G Int = Bool
+type instance G Float = Int
+
+
+instance A Int where
+ data B Int x = Con x
+ f = Con 3
+
+g = Con 5