[Haskell] Haskell 98 syntax question

Hello, referring to the Haskell 98 report as available in the Internet, I have a short question. Section 4.1.3 (Syntax of Class Assertions and Contexts) contains the rule: class -> qtycls tyvar | qtycls ( tyvar atype1 ... atypen ) (n>=1) Is there a (simple) practical example of a Haskell type expression using the second line of the above rule? Thanks a lot, Sascha -- Der GMX SmartSurfer hilft bis zu 70% Ihrer Onlinekosten zu sparen! Ideal für Modem und ISDN: http://www.gmx.net/de/go/smartsurfer