[Haskell-cafe] Illegal type def

Hi

type assoc k v = [(k, v)]

works beautifully and everything makes sense.

type Assoc v = (Ord k) => [(k, v)]

This doesn't work. Is there any wayof defining k as an element of type Ordinal. I could redefine k by putting Char or Int in its place. Why can't I be more general? Thanks, Paul