[Haskell-beginners] IO vars

[Corentin Dupont]

Hi all,
there is something very basic that it seems escaped me.
For example with the following program f and g have type IO () and I can
thread a value between the two using a file.
Can I do the exact same (not changing the types of f and g) without a file?*

f,g :: IO ()
**f = withFile "toto" WriteMode (flip hPutStr "toto")
g = withFile "toto" ReadMode hGetLine >>= putStrLn
main = f >> g*

Thanks and cheers,
Corentin
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