Nick Coghlan added the comment:

Rather than allowing this on tracebacks directly, I'd prefer to build on the 
"TracebackException" work and allow traceback summaries in all the places where 
we currently require real tracebacks (including exception __traceback__ 
attributes): 
https://docs.python.org/3/library/traceback.html#tracebackexception-objects

The essential requirement here would be to abstract out a "traceback protocol" 
from the current concrete traceback objects, and adapt affected parts of the 
interpreter (such as the traceback display on shutdown) to use that abstract 
protocol when dealing with a non-native traceback object.

----------
nosy: +giampaolo.rodola, haypo, yselivanov

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<http://bugs.python.org/issue30579>
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