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That's why I'm split:  I do like the new *messages* better 
(their content), but I don't like losing the tracebacks.  
Sometimes it's a bug in the test driver-- or in 20 layers of test 
driver code --and sometimes it's even a bug in unittest itself.  
The traceback is a fundamental tool when things go wrong, 
so I'm never in favor of hiding parts of tracebacks (hiding could 
be appropriate if you *knew* the true cause isn't in the part 
you're hiding -- but you can't know that).