[Haskell-cafe] exception output

Hi, the following program main = readFile "nonexistent" >>= putStr is meant to produce an exception. When compiled with GHC 6.4, it outputs the "*** Exception..." string to stderr, which makes me happy. However, when run with runghc6 or runhugs, the message is sent to stdout, which makes me sad. Is this inconsistency intentional? -- Thanks, Feri.