Mike Jones wrote:
> Yes, I do derive Show for MyData. I was surprised it did not work.

Deriving works, but GHC currently only contains instance declarations
for tuples up to 5 elements, so you have to write you own boring
instances for larger ones.  *yawn*

Cheers,
   Sven
-- 
Sven Panne                                        Tel.: +49/89/2178-2235
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