[issue22906] PEP 479: Change StopIteration handling inside generators

[Nick Coghlan]

Nick Coghlan added the comment:

Yury's patch mostly looks good to me, except:

* the check in contextlib should be against __cause__ rather than
__context__, and there should be a new test for this code handling path
* there should be a new test for the __future__ flag itself (independently
of the contextlib tests)

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<http://bugs.python.org/issue22906>
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