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{-# LANGUAGE Haskell2010 #-}
{-# LANGUAGE TypeInType #-} -- or PolyKinds
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
module T15352 where
import Data.Kind
class C (x :: Type) (y :: k) where
type F y
type Hom k = k -> k -> Type
type family Ob (p :: Hom k) :: k -> Constraint
class ( obP ~ Ob p
, opP ~ Dom p
, obQ ~ Ob q
, opQ ~ Dom q
, p ~ Dom f
, q ~ Cod f
) => Functor' (obP :: i -> Constraint)
(opP :: Hom i)
(p :: Hom i)
(obQ :: j -> Constraint)
(opQ :: Hom j)
(q :: Hom j)
(f :: i -> j) where
type Dom f :: Hom i
type Cod f :: Hom j
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