[issue12703] Improve error reporting for packaging.util.resolve_name

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

I would like to commit this.  Tests are needed.  Does someone want to write them?  Please ask any question you might have, we’re here to help :)

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stage: needs patch -> test needed
versions: +3rd party

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