[issue3611] invalid exception context

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

Some progress:
The lines suppressed by the patch at http://bugs.python.org/msg71579
either do nothing (because e.g exc_type is already NULL or None),
or happen to be in a case similar to the script "lostcontext2.py"
(Most of the time, the flush() function in io.py).

So again, I think these lines should be suppressed.
The test suite still pass, and all the "-R::" I ran did return identical
result.
Can this patch go in?

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