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I think I've found a bug in ghc 2.01. Derived instances of the Enum class don't have a 
fromEnum 
 method. This only shows up as a run time error - even
 more annoying!, with the message :
 
 Fail: noDefaultMethodError:Prelude.Enum.fromEnum
 
 and as far as I can tell, this happens for any 
 user-defined enumeration type

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