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{-# LANGUAGE RankNTypes, ScopedTypeVariables #-}
module ShouldCompile where
import Control.Monad.ST
import Data.STRef
-- (Modified now that we don't have result type signatures)
f:: forall s. ST s Int
f = do v <- newSTRef 5
let g :: ST s Int
-- ^ should be in scope
g = readSTRef v
g
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