On Tue, 2008-12-30 at 17:12 +0000, ra...@msn.com wrote: > Hi, how can I make the following code work? (show all the possible values of > a type 'a') > > > showAll :: (Eq a, Bounded a, Enum a) => a -> [a] > > showAll a = [minBound..maxBound]::[a]
The bottom 'a' has nothing to do with the 'a' in the type signature. Your code is equivalent to > > showAll :: (Eq a, Bounded a, Enum a) => a -> [a] > > showAll a = [minBound..maxBound]::[b] Which is not type correct as [minBound..maxBound] :: (Bounded a, Enum a) => [a] You don't need that type annotation (or the type signature for that matter), so just omit it. _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
