[issue17911] traceback: add a new thin class storing a traceback without storing local variables

[Robert Collins]

Robert Collins added the comment:

Ok, cgitb - its passing a string instead of an exception type into format_exception - something that was never supported - it only works by accident AFAICT, because the old format code was ignoring the etype - it was deriving the type from the value. Thats easy to accomodate in the compat code.

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<http://bugs.python.org/issue17911>
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