[issue46771] Add some form of cancel scopes

[Alex Grönholm]

Alex Grönholm <alex.gronholm at nextday.fi> added the comment:

I am also uncomfortable using the cancel message to deliver the token/nonce/whatever.

If TaskGroup.cancel() is implemented, would it also deliver a cancellation in the parent task like trio and AnyIO do? It should IMHO, because otherwise if the task group is cancelled, it could still get stuck waiting on whatever the parent task happens to be waiting on, if it's not at TaskGroup.__aexit__() yet.

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