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Left readFile001.out: openFile: resource busy (file is locked)
-- !!! readFile test
import System.IO
import System.IO.Error
source = "readFile001.hs"
filename = "readFile001.out"
main = do
s <- readFile source
h <- openFile filename WriteMode
hPutStrLn h s
hClose h
s <- readFile filename
-- This open should fail, because the readFile hasn't been forced
-- and the file is therefore still locked.
tryIOError (openFile filename WriteMode) >>= print
putStrLn s
-- should be able to open it for writing now, because we've forced the
-- whole file.
h <- openFile filename WriteMode
print h
{handle: readFile001.out}
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