[issue16596] Skip stack unwinding when "next", "until" and "return" pdb commands executed in generator context

[Phil Connell]

Phil Connell added the comment:

It looks like call_exc_trace is leaking refs to Py_None.

I believe the attached patch fixes the issue (it certainly fixes Antoine's failing invokation :)

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Added file: http://bugs.python.org/file32794/issue16596_leak.diff

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