[issue39758] StreamWriter.wait_closed() can hang indefinitely.

[Julien Palard]

Julien Palard <julien+python at palard.fr> added the comment:

Can reproduce in:

- 3.8.0
- 3.8.2
- 3.7.6

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nosy: +mdk

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39758>
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