regression in TeX Live 2023 concerning some math characters

[Vincent Lefevre]

On 2023-11-23 15:25:52 +0100, Zdenek Wagner wrote:
> You can put \listfiles above \documentclass and the log will contain
> versions of all files used. You can then look for changes.

First, I confirm that everything is fine on the same machine
with the current upstream TeX Live (which I've installed
with info from https://tug.org/texlive/quickinstall.html):

 *File List*
 article.cls    2023/05/17 v1.4n Standard LaTeX document class
  size10.clo    2023/05/17 v1.4n Standard LaTeX file (size option)
l3backend-pdftex.def    2023-11-09 L3 backend support: PDF output (pdfTeX)

Everything is fine in Debian stable:

 *File List*
 article.cls    2022/07/02 v1.4n Standard LaTeX document class
  size10.clo    2022/07/02 v1.4n Standard LaTeX file (size option)
l3backend-pdftex.def    2023-01-16 L3 backend support: PDF output (pdfTeX)

But this is buggy in Debian unstable:

 *File List*
 article.cls    2023/05/17 v1.4n Standard LaTeX document class
  size10.clo    2023/05/17 v1.4n Standard LaTeX file (size option)
l3backend-pdftex.def    2023-04-19 L3 backend support: PDF output (pdfTeX)

and if I replace l3backend-pdftex.def with the Debian/stable
version, i.e. with

 *File List*
 article.cls    2023/05/17 v1.4n Standard LaTeX document class
  size10.clo    2023/05/17 v1.4n Standard LaTeX file (size option)
l3backend-pdftex.def    2023-01-16 L3 backend support: PDF output (pdfTeX)

this is bugy too. So it seems that the issue doesn't come from these
files (FYI, I can't test by just replacing l3backend-pdftex.def with
2023-11-09, as I get an error due to the L3 programming layer in the
LaTeX format being too old in this case).

-- 
Vincent Lefèvre <vincent at vinc17.net> - Web: <https://www.vinc17.net/>
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Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)