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{-# LANGUAGE RankNTypes #-}
{-# LANGUAGE ImpredicativeTypes #-}
module T8428 where
import Control.Monad.ST
data IdentityT m a = IdentityT { runIdentityT :: m a }
runIdST :: IdentityT (forall s. ST s) a -> a
runIdST = runST . runIdentityT
-- Test formatting in the error message.
-- In fact this should be rejected as a kind error (#8388)
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