[3.11] GH-95704: Don't suppress errors from tasks when TG is cancelled (GH-95761) #96048
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…pythonGH-95761) When a task catches CancelledError and raises some other error, the other error should not silently be suppressed. Any scenario where a task crashes in cleanup upon cancellation will now result in an ExceptionGroup wrapping the crash(es) instead of propagating CancelledError and ignoring the side errors. NOTE: This represents a change in behavior (hence the need to change several tests). But it is only an edge case. Co-authored-by: Thomas Grainger <tagrain@gmail.com> (cherry picked from commit f51f54f) Co-authored-by: Guido van Rossum <guido@python.org>
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@pablogsal -- this is a small change to TaskGroup itself, but it does change a bunch of TaskGroup tests that were previously expecting side errors to be ignored. |
gvanrossum
approved these changes
Aug 17, 2022
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Status check is done, and it's a success |
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Whoa, Miss-Islington auto-merged it. I did not expect that. Sorry. |
Don't worry about it. I reviewed it and looks good |
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Thanks for the explanation in the meeting! |
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When a task catches CancelledError and raises some other error,
the other error should not silently be suppressed.
Any scenario where a task crashes in cleanup upon cancellation
will now result in an ExceptionGroup wrapping the crash(es)
instead of propagating CancelledError and ignoring the side errors.
NOTE: This represents a change in behavior (hence the need to
change several tests). But it is only an edge case.
Co-authored-by: Thomas Grainger tagrain@gmail.com
(cherry picked from commit f51f54f)
Co-authored-by: Guido van Rossum guido@python.org