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

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Message #8 received at 30964 <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> gmail.com>
To: dancol <at> dancol.org
Cc: 30964 <at> debbugs.gnu.org, Stefan Monnier <monnier <at> iro.umontreal.ca>
Subject: Re: bug#30964: python-mode failing "overlapping strings" assertion
 lately
Date: Sun, 01 Apr 2018 21:11:26 -0400

dancol <at> dancol.org writes:

> Has something changed in master that might be breaking python-mode? We
> keep hitting a parsing assertion.
>
> The surrounding code in python.el claims that
>
>                        ;; The assertion can only fail if syntax table
>                        ;; text properties and the `syntax-ppss' cache
>                        ;; are somehow out of whack.  This has been
>                        ;; observed when using `syntax-ppss' during
>                        ;; narrowing.
>                        (cl-assert (> string-start last-string-end)
>                                   :show-args
>                                   "\
> Overlapping strings detected (start=%d, last-end=%d)")
>
> I can _sometimes_ repro with (while (not (eobp))
> (python-nav-forward-statement)), but I haven't found a reliable test case.

How recent is "lately"?  Could it be related to [1: 14b9558752]?

[1: 14b9558752]: 2017-12-12 23:03:00 -0500
  * src/syntax.c (find_defun_start): Use syntax-ppss
  https://git.savannah.gnu.org/cgit/emacs.git/commit/?id=14b95587520959c5b54356547a0a69932a9bb480

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