[issue23631] 3.5 (a2) traceback regression snarls Idle

[Robert Collins]

Robert Collins added the comment:

Ah, idle is being somewhat naughty. It's taking the original traceback and then mangling the contents in-place, which is preserving the type information, and throwing off StackSummary.from_list. We can and should make the new code deal with this in case other folk are doing it. In future it would be good to subsume cleanup_traceback's guts into the traceback module, but we don't need to do that now.

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