PEP 492 is provisional, we can change things like this in 3.5.2.

On Wed, Dec 16, 2015 at 3:48 PM, Martin Panter <report@bugs.python.org>
wrote:

>
> Martin Panter added the comment:
>
> It should always be valid to create a new coroutine instance. Perhaps you
> meant:
>
> instance = foo()
> print(await instance)  # Okay the first time
> print(await instance)  # Second time should be an error
>
> This seems sensible, at least for 3.6. Maybe it should also be an error to
> re-await if the coroutine raised an exception, and if it was cancelled via
> close().
>
> ----------
> nosy: +martin.panter
>
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> <http://bugs.python.org/issue25887>
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