[issue27968] test_coroutines generates some warnings

[Roundup Robot]

Roundup Robot added the comment:

New changeset 234f758449f8 by Benjamin Peterson in branch '3.5':
supress coroutine warning when an exception is pending (#27968)
https://hg.python.org/cpython/rev/234f758449f8

New changeset f48b00b1ec4f by Benjamin Peterson in branch 'default':
merge 3.5 (#27968)
https://hg.python.org/cpython/rev/f48b00b1ec4f

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nosy: +python-dev

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<http://bugs.python.org/issue27968>
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