I am trying to write an event driven application in Haskell, to run under Hugs. The following is an extract ...
-- just define any sort of handling process (Key a b) = putChar 'a' process (Button a b c) = putChar 'a' process (MouseMove a) = putChar 'a' process (Resize) = putChar 'a' Now I check the type of the following ... process :: Event -> IO () getEvent :: Window -> IO Event openWindow "a" (100,100) :: IO Window So I try ... (openWindow "a" (100,100)) >>= getEvent >>= process And get the following error ... ERROR - Type error in application *** Expression : openWindow "a" (100,100) >>= getEvent >>= process *** Term : openWindow "a" (100,100) >>= getEvent *** Type : IO Event *** Does not match : IO Event Say what? I suspect, perhaps a compatability problem, since I detect the presence of two different versions of getEvent, one of type Window -> IO Event, and the other of type Events -> IO Event. But I can't figure out the right configuration, and that error message makes no sense to me. I even went and got a cup of coffee ... but I still get the same error message. <sigh> Regards, Bruce (IIMS/CS Massey at Albany). _______________________________________________ Hugs-Users mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/hugs-users
