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{-# LANGUAGE AllowAmbiguousTypes, RankNTypes, TypeFamilies, KindSignatures #-}
-- The type of 'run' is actually ambiguous
module T5934 where
import Control.Monad.ST
data Gen s
type GenST s = Gen (PrimState (ST s))
run :: (forall s. GenST s) -> Int
run = 0
type family PrimState (m :: * -> *)
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