[issue27527] Make not yielding from or awaiting a coroutine a SyntaxError

[Decorater]

Decorater added the comment:

Oh it does not happen if you use the asyncio.coroutine decorater but it does do RuntimeWarning if you use the async def on it.

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versions:  -Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27527>
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