Maybe, there exists another possibility to print the values in the
error message like for 
                       take (-1) xs,   y % 0 

The implementors declare the "internal" 
                         class ServiceShow where serviceShows :: ...
invisible for the user, 
make *everything* to be the instance of  ServiceShow,
serviceShow the *functions* as  `<func>' ...
and apply  serviceShows  to form the error messages.
?
But I wrote recently kind of rubbish on the subject of  head [].
And I am sorry if this one occurs silly too!

------------------
Sergey Mechveliani
[EMAIL PROTECTED]






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