[issue46771] Add some form of cancel scopes

[Andrew Svetlov]

Andrew Svetlov <andrew.svetlov at gmail.com> added the comment:

If some code is used together with timeout() and this code calls `.cancel()` but forgot about `.uncancel()` in try/except/finally -- timeout() never raises TimeoutError.

Should we care? The missing `.uncancel()` call is hard to detect by the runtime and static checkers.

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