[issue42140] asyncio.wait function creates futures set two times

[Denis S. Otkidach]

Denis S. Otkidach <denis.otkidach at gmail.com> added the comment:

The current error message is way too cryptic anyway.  And restricting it to the set type only, as in docs, will certainly break a lot of code (passing a list is quite common).

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42140>
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