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{-# LANGUAGE MultiParamTypeClasses, TypeInType, ConstrainedClassMethods, ScopedTypeVariables #-}
module T16342 where
import Data.Proxy
class C (a::ka) x where
cop :: D a x => x -> Proxy a -> Proxy a
cop _ x = x :: Proxy (a::ka)
class D (b::kb) y where
dop :: C b y => y -> Proxy b -> Proxy b
dop _ x = x :: Proxy (b::kb)
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