[issue46771] Add some form of cancel scopes

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

PS. The cancel count can work whether or not cancel() returns without setting must-cancel (or cancelling the underlying future/task) when there's already a cancellation in progress. Other things may be different though. We have to look into this separately.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue46771>
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