[issue25888] awaiting on coroutine that is being awaited should be an error

[Yury Selivanov]

Yury Selivanov added the comment:

The patch is attached, please review.

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keywords: +patch
stage:  -> patch review
Added file: http://bugs.python.org/file41339/Issue25888.patch

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<http://bugs.python.org/issue25888>
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