David,
that was fast :-) Thank you for your help!
Hartmut


On Sun, Aug 7, 2011 at 11:47 PM, David Place <d@vidplace.com> wrote:
On Aug 7, 2011, at 5:39 PM, Hartmut wrote:

How can I formulate this show method correctly?

instance (Show a, Read a) => Show (EW a) where
  show (EW x) = show "EW:" ++ show x


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David Place   
Owner, Panpipes Ho! LLC