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bpo-42064: Pass module state to trace, progress, and authorizer callbacks (GH-27940)

- add print-or-clear traceback helper
- add helpers to clear and visit saved contexts
- modify callbacks to use the new callback_context struct
E
Erlend Egeberg Aasland committed
979336de34e3d3f40cf6e666b72a618f6330f3c1
Parent: 8ca6b61
Committed by GitHub <noreply@github.com> on 9/7/2021, 1:06:17 PM