The following code will on Linux print three strings each followed by a NULL byte:

module Main where

putStr0 = putStr $ s ++ "\0"

main = do
    putStr0 "Hello"
    putStr0 "Hello"
    putStr0 "Hello"

On Windows however it will print nothing! In order to trigger printing I have to change the definition of putStr0 to

putStr0 = putStr (s ++ "\0") >> hFlush stdout

Is this difference in behaviour due to a bug in GHC on Windows or just a quirkiness of the platform?

/M