[Haskell] Haskell 98 syntax question

["Sascha Böhme"]

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
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