#7583: IO reordering ---------------------------------------------+------------------------------ Reporter: Heimdell | Owner: Type: bug | Status: closed Priority: normal | Component: Compiler Version: 7.4.1 | Resolution: invalid Keywords: IO, invalid evaluation order | Os: Linux Architecture: x86_64 (amd64) | Failure: Incorrect result at runtime Blockedby: | Blocking: Related: | ---------------------------------------------+------------------------------ Changes (by monoidal): * status: new => closed * resolution: => invalid Comment: This is because GHC uses line buffering by default, while GHCi disables buffering. You can flush after each output or disable buffering: {{{ import System.IO main = do hSetBuffering stdout NoBuffering putStr "> " line <- getLine putStrLn line }}} -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7583#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler