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{-# LANGUAGE ScopedTypeVariables #-}
module Main where
import Data.IORef
main :: IO ()
main = do { (r :: IORef (t -> t)) <- newIORef id
-- r <- newIORef i -- => Type-check error
; writeIORef r (\v -> if v then False else True)
; c <- readIORef r
; print $ c True
; print $ c 1234 }
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