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{-# LANGUAGE Rank2Types #-}
module T6069 where
import Control.Monad.ST
import Data.STRef
fourty_two :: forall s. ST s Int
fourty_two = do
x <- newSTRef (42::Int)
readSTRef x
f1 = (print . runST) fourty_two -- (1)
f2 = (print . runST) $ fourty_two -- (2)
f3 = ((print . runST) $) fourty_two -- (3)
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