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{-# Language RankNTypes #-}
{-# Language DataKinds #-}
{-# Language PolyKinds #-}
{-# Language GADTs #-}
module T15872 where
import Data.Kind
data WHICH = OP | OPOP
data Fun :: forall (a :: WHICH). a ~ OP => Type -> Type -> Type where
MkFun :: (a -> b) -> Fun a b
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