Quoth InteractiveUI.runGHCi: case maybe_expr of Nothing -> do #if defined(mingw32_HOST_OS) -- The win32 Console API mutates the first character of -- type-ahead when reading from it in a non-buffered manner. Work -- around this by flushing the input buffer of type-ahead characters, -- but only if stdin is available. flushed <- io (IO.try (GHC.ConsoleHandler.flushConsole stdin)) case flushed of Left err | isDoesNotExistError err -> return () | otherwise -> io (ioError err) Right () -> return () #endif -- enter the interactive loop interactiveLoop is_tty show_prompt Could this be related somehow? -Yitz