Alex Grönholm <alex.gronh...@nextday.fi> added the comment:

> Propagating an ExceptionGroup where every exception can be inspected to see 
> if it was caused by this code or not still seems like the safe option to me 
> (and obviously still has the cancel count implicitly).

Note that this, too, causes backwards incompatible changes in cancellation 
behavior. Previously, when the task was cancelled twice, only one 
CancelledError was raised. Now it would raise a BaseExceptionGroup instead.

The current backward incompatible changes in cancellation behavior are already 
causing 10 tests to fail in the AnyIO test suite. I'm trying to find an 
alternate solution that does not break anything.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue46771>
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