Re: [Haskell-beginners] fonction in a typeclass that does not mention the type variable

Peter Jones writes:

Your `symbolToConstructor' function is too specific for both cases you describe. You'd need to change the `String' argument to `a' and put it back in the type class or write it like this:

symbolToInfixLevel :: (Foo a) => a -> Int symbolToInfixLevel s = infixLevel $ (symbolToConstructor s) undefined

Actually, the problem is with your `symbolToConstructor' function. It needs to look like this: symbolToConstructor :: (Foo a) => String -> a Then symbolToInfixLevel can be: symbolToInfixLevel :: String -> Int -- Peter Jones, Founder, Devalot.com Defending the honor of good code