[issue30098] Verbose TypeError for asyncio.ensure_future

[Yury Selivanov]

Yury Selivanov added the comment:

`asyncio.run_coroutine_threadsafe` was't designed to be compatible with `asyncio.ensure_future`. It should be used to run a coroutine in an event loop from another thread. You shouldn't need to await on the future it returns.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30098>
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