File: openFile001.hs

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-- !!! test that a file opened in ReadMode can't be written to

import System.IO
import System.IO.Error

main = do
  hIn <- openFile "openFile001.hs" ReadMode
  hPutStr hIn "test" `catchIOError` \ err ->
      if isIllegalOperation err
        then putStrLn "ok."
        else error "Oh dear\n"