[issue46771] Add some form of cancel scopes

[Tin Tvrtković]

Tin Tvrtković <tinchester at gmail.com> added the comment:

On the topic of TaskGroups needing to know whether to swallow a child CancelledError or no: just use the same nonce/cancellation context trick?

I remember asking Nathaniel about why in Trio nurseries and cancel scopes were linked (nurseries contain a cancel scope there), whereas in Quattro they are completely separate, and not really understanding the answer. I think I'm getting it now.

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