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{-# LANGUAGE TypeFamilies, PolyKinds, ConstraintKinds #-}
module T20356 where
import GHC.Types
type family Id (a :: k -> Constraint) :: l -> Constraint
type instance Id f = f
type T :: Constraint -> Constraint
type T = Id Eq
data Proxy p = MkProxy
id' :: f a -> f a
id' x = x
z = id' (MkProxy @T)
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