[Haskell-cafe] expression problem
patrick.browne at dit.ie
Mon Aug 16 06:17:06 EDT 2010
The expression problem  can be described as the ability to add new
variants (either constructors or methods) to a data type without
changing the existing code. The Haskell and OO language issues are well
described at 
It seems that the expression problem does not exist in Maude.
My question is:
Using basic and easy parts of the Haskell, does Haskell currently handle
the expression problem. In other words I would like to avoid demanding
and sophisticated coding techniques or non-standard Haskell extensions
(i.e. it should be easy for the average programmer to use).
If there is a simple solution could you please point me to an example.
 Dr. Ralf Laemmel
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