> Yes, using a ghc extension of scoped type variables. In the signature > of testFunction, if you explicitly quantify all your variables with > forall, then they are visible in the where clause (and elsewhere in > the function).
Perfect! But how come if I have: testFunction :: forall a b. Ord a => Map.Map a b -> Map.Map a b -> a -> (Maybe b, Maybe b) I get: Test1.hs:6:34: parse error on input `=>' Is the syntax incorrect? Many thanks Chris. _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
