[issue27972] Confusing error during cyclic yield

[Roundup Robot]

Roundup Robot added the comment:

New changeset 8d877876aa89 by Yury Selivanov in branch '3.5':
Issue #27972: Prohibit Tasks to await on themselves.
https://hg.python.org/cpython/rev/8d877876aa89

New changeset 41c4f535b5c0 by Yury Selivanov in branch '3.6':
Merge 3.5 (issue #27972)
https://hg.python.org/cpython/rev/41c4f535b5c0

New changeset 47720192b318 by Yury Selivanov in branch 'default':
Merge 3.6 (issue #27972)
https://hg.python.org/cpython/rev/47720192b318

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nosy: +python-dev

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<http://bugs.python.org/issue27972>
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