GNU bug report logs - #30964
python-mode failing "overlapping strings" assertion lately

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Package: emacs;

Reported by: dancol <at> dancol.org

Date: Tue, 27 Mar 2018 18:10:01 UTC

Severity: normal

Done: "Daniel Colascione" <dancol <at> dancol.org>

Bug is archived. No further changes may be made.

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From: "Daniel Colascione" <dancol <at> dancol.org>
To: "Noam Postavsky" <npostavs <at> gmail.com>
Cc: "Clément Pit-Claudel" <clement.pitclaudel <at> live.com>, Philipp Stephani <p.stephani2 <at> gmail.com>, 30964 <at> debbugs.gnu.org, dancol <at> dancol.org
Subject: bug#30964: python-mode failing "overlapping strings" assertion lately
Date: Sat, 16 Jun 2018 13:55:49 -0700

So it turns out that it wasn't an off-by-one problem at all.  Instead,
python was using (re-search-forward (rx (syntax string-delimiter))), which
was matching incorrectly because re-search-forward didn't update syntax as
it matched. It didn't do that because regex matching in general wasn't
reentrant, and it wasn't reentrant because regex bytecode programs are
self-modifying.

I checked in some work that makes regex searching update syntax as needed.
This bug report was last modified 6 years and 344 days ago.

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