[issue46771] Add some form of cancel scopes

[Guido van Rossum]

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

Everyone,

I've sent a PR (which I expect will make it into alpha 6) that restores the old cancel() semantics. This should make Tin happy, but I think we'll still have to have a longer discussion about the downsides.

https://github.com/python/cpython/pull/31623

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