I/O sequencing problem on OS X/x86

[guest]

The following small program behaves strangely on Mac OS X on x86:

module Main where

main = do
  putStr "Tell me? "
  response <- getLine
  putStrLn ("You said: " ++ response)

It should print the prompt, wait for input, and then report what it read. When compiled to a binary with GHC, however, it first waits for input, then prints the prompt and the response together. Strangely, if run inside GHCi, it works correctly. It also works correctly under Hugs.

[duncan]

It might be confusing at first, but it isn't a bug. See this  FAQ entry.