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

[Yury Selivanov]

Yury Selivanov added the comment:

Will commit this patch tomorrow to 3.5 and 3.6.

It only affects coroutines (async defs): if an await expression is used on a coroutine object while it's being already awaited by another coroutine, a `RuntimeError("coroutine is being awaited already")` will be triggered.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25888>
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