[issue25887] awaiting on coroutine more than once should be an error

[Yury Selivanov]

Yury Selivanov added the comment:

"Cannot await previously awaited coroutine" might be confusing if raised on "coro.send(..)"-like code...

So far "coroutine was already awaited on" (do you want to drop "was", btw?) is less of all evil IMHO.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25887>
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