[Haskell-cafe] Standard 'decorator' class?

Jacques Carette carette at mcmaster.ca
Fri Sep 23 15:55:19 CEST 2011

Has a class like

class Decoration t where
   type Datum t :: *
   value :: t -> Datum t

been defined in any of the haskell packages on hackage?  [There are so 
many variants on naming, it is rather difficult to search for this]


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