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@Zac-HD Zac-HD commented Jun 11, 2022

Extracted from #3308 (see also #3175) for the sake of smaller and easier-to-read diffs.

I'll then try to pick up just the __notes__ changes in a separate PR, and defer the replacement of MultipleFailures until Pytest displays ExceptionGroup inner exceptions.

@Zac-HD Zac-HD requested a review from sobolevn June 11, 2022 08:41
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Thanks! This was interesting. I'm still trying to wrap my head around the little details of ExceptionGroup implementation.

Also, a question about exceptiongroups package. It has this section: https://github.com/agronholm/exceptiongroup#notes-on-monkey-patching Can it be a problem for us in any way? 🤔

if errors:
if len(errors) == 1:
raise errors[0] from exc_value
raise BaseExceptionGroup("Cleanup failed", errors) from exc_value
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Question: do we need to use from with exception groups? I've never tried it :)

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https://docs.python.org/3/tutorial/errors.html#exception-chaining

It just indicates that we're deliberately replacing the previous exception, instead of hitting another error while handling it.

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Zac-HD commented Jun 12, 2022

The monkey patching is actually pretty important here - without it, we wouldn't display eg notes on previous versions.

@Zac-HD Zac-HD merged commit 2ccf867 into HypothesisWorks:master Jun 12, 2022
@Zac-HD Zac-HD deleted the using-exceptiongroups branch June 12, 2022 17:13
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Just as an FYI, I've discovered that depending on the exceptiongroup RC might be somewhat problematic for people using mamba to install the conda package.
conda-forge/hypothesis-feedstock#730

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Zac-HD commented Aug 10, 2022

Unfortunately there's not much I can do here; the conda-forge package for Hypothesis is not provided or endorsed by the Hypothesis maintainers.

My main reaction is "maybe mamba should support pre-releases then"!

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Unfortunately there's not much I can do here

Sure, I understand.

My main reaction is "maybe mamba should support pre-releases then"!

Right. That'll be my next step too, I guess.

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Zac-HD commented Aug 10, 2022

Good luck! I do really appreciate the report, even if I can't help directly 😅

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