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{-# LANGUAGE Haskell2010 #-}
{-# LANGUAGE Safe #-}
-- | Import unsafe module System.IO.Unsafe to make sure it fails
module Main where
import System.IO.Unsafe
f :: Int
f = unsafePerformIO $ putStrLn "What kind of swallow?" >> return 2
main :: IO ()
main = putStrLn $ "X is: " ++ show f
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