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{-# LANGUAGE ExplicitForAll #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE PolyKinds #-}
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE TypeInType #-}
module ExplicitForAllFams where
import Data.Proxy
import Data.Kind
-- From Proposal 0007
data family F a
data instance forall (x :: Bool). F (Proxy x) = MkF
class C a where
type G a b
instance forall a. C [a] where
type forall b. G [a] b = Int
type family H a b where
forall x y. H [x] (Proxy y) = Double
forall z. H z z = Bool
-- More tests
type family D a b where
forall (a :: Type -> Type) (b :: a Int) (c :: k). D (Proxy b) (Proxy c) = ()
forall (a :: Bool) (b :: Proxy a). D (Proxy b) () = Int
forall (a :: Type). D a a = Maybe a
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