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-- !!! Open a non-existent file for writing
import Control.Monad
import Data.Char
import System.Directory
import System.IO
file = "openFile004.out"
main = do
b <- doesFileExist file
when b (removeFile file)
h <- openFile file WriteMode
hPutStr h "hello world\n"
hClose h
h <- openFile file ReadMode
let loop = do
b <- hIsEOF h
if b then return ()
else do c <- hGetChar h; putChar c; loop
loop
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