You haven't really said what happens when you try this, but I would bet that
things would be clarified greatly if you put type signatures on your two
definitions.
On Fri, Apr 3, 2009 at 12:49 PM, Michael Roth
Hello list,
maybe I'm just stupid, I'm trying to do something like this:
import Control.Monad import Control.Monad.Trans import Control.Monad.List
foobar = do a <- [1,2,3] b <- [4,5,6] liftIO $ putStrLn $ (show a) ++ " " ++ (show b) return (a+b)
main = do sums <- foobar print sums
But this apparently doesn't work... I'm total clueless how to achieve the correct solution. Maybe my mental image on the monad transformer thing is totally wrong?
Michael _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe