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{-# LANGUAGE Haskell2010 #-}
{-# LANGUAGE PolyKinds, MultiParamTypeClasses, FlexibleContexts, DataKinds,
TypeFamilies #-}
module T9200 where
import Data.Kind (Type)
import Data.Proxy
------
-- test CUSK on classes
class C (f :: k) (a :: k2) where
c_meth :: D a => Proxy f -> Proxy a -> ()
class C () a => D a
---------
--- test CUSK on type synonyms
data T1 a b c = MkT1 (S True b c)
data T2 p q r = MkT2 (S p 5 r)
data T3 x y q = MkT3 (S x y '())
type S (f :: k1) (g :: k2) (h :: k3) = ((T1 f g h, T2 f g h, T3 f g h) :: Type)
----------
-- test CUSK on closed type families
type family F (a :: k) :: k where
F True = False
F False = True
F x = x
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