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bug#42147: 28.0.50; pure vs side-effect-free, missing optimizations?

From: Mattias Engdegård
Subject: bug#42147: 28.0.50; pure vs side-effect-free, missing optimizations?
Date: Sun, 26 Jul 2020 11:05:45 +0200 
26 juli 2020 kl. 00.30 skrev Stefan Monnier <monnier@iro.umontreal.ca>:

> But yes, it's a problem because `C-h o kbd RET` says explicitly that it
> doesn't change the match data :-(

Motivation enough for them to save the match data then.
What about the attached patch?

Attachment: 0001-Preserve-match-data-in-kbd-and-package-get-version.patch
Description: Binary data

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