Re: [Haskell-cafe] Ambiguous type variable

Arjun Guha wrote:

AlphaBeta.hs:1: Ambiguous type variable `v' in the top-level constraint: `Ord v' arising from use of `maxValue' at AlphaBeta.hs:12

Another person had a similar problem just the other week.. The error messages are different, but the problem is the same. Read the messages in this thread: http://www.haskell.org//pipermail/haskell-cafe/2004-July/006424.html Then read "Type classes with functional dependencies", Mark P. Jones, 2000 You can get the paper at http://www.cse.ogi.edu/~mpj Ben.