Hello, >1) Do you really need a Monad instance for this?
Only for training purposes. 2) One possibility is just have it being (Node x _ _) >>= f = f x I've already tried to do so, but i get only 1 element. Look. I have a function fillTree that's fill this binary tree. let a = fillTree 1 Empty a >>= \x -> return (x * 2) I got: Node 2 Empty Empty But i have tree with 100 elements. Thank you. Thank you. _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
