[Haskell-cafe] do you have to use fix with forkio?

In this chat server implementation http://www.haskell.org/haskellwiki/Implement_a_chat_server forkIO is used with fix as in: reader <- forkIO $ http://haskell.org/ghc/docs/latest/html/libraries/base/Prelude.html#v:. fix $ http://haskell.org/ghc/docs/latest/html/libraries/base/Prelude.html#v:. \loop -> do (nr', line) <- readChan chan' when (nr /= http://haskell.org/ghc/docs/latest/html/libraries/base/Prelude.html#v:/= nr') $ http://haskell.org/ghc/docs/latest/html/libraries/base/Prelude.html#v:. hPutStrLn hdl line loop Do you have to use fix? Or is there a way to write this with a "let"? -- Daryoush