Polyglossia, autolang and language

[maieul]

Consider this MWE

\documentclass{article}
\usepackage{filecontents}
\begin{filecontents}{\jobname.bib}
@book{toto,
  title={toto}
}
\end{filecontents}
\usepackage{polyglossia}
\setmainlanguage{french}
\usepackage[autolang=hyphen,language=french]{biblatex}
\addbibresource{\jobname.bib}
\begin{document}
\cite{toto}
\end{document}

With biblatex 3.9, at the run after the biber run, we get undefined command erro.

If we dont ONE of this following thins

• switch to babel
• suppresse language option
• suppression autolang option

We don't get the problem anymore.

[moewew]

Not our fault (well partly my fault, but this has nothing to do with biblatex).

\documentclass{article}
\usepackage{polyglossia}
\setmainlanguage{french}
\begin{document}
\begin{hyphenrules}{french}toto\end{hypnerules}
\end{document}

reproduces the same problem.

See https://tex.stackexchange.com/q/400986/35864.

This error came about because of https://tex.stackexchange.com/a/396614/35864 and latex3/latex2e@8b0b10b. hyphenrules now uses certain private macros instead of kernel commands. Apparently polyglossia doesn't like that.

You could try to complain to the polyglossia people (https://github.com/reutenauer/polyglossia/issues), but I'm not sure how quickly things will be fixed then. Or to the babel people: https://github.com/latex3/latex2e/issues

[maieul]

Unfortunaly, @reutenaeur seems to have forgetten polyglossia maintenance. I have asked to him to send on CTAN a bugfix (that I made) since 6 month ago, and I didn't get any answer. I think we could considerer polyglossia is unmaintened. I will look on babel feature, which seems to be more powerful, now, than polyglossia. Best regards

[moewew]

Yes I know this is an annoyance for some polyglossia users.

Since babel's hyphenrules definitions are taken from the format directly by polyglossia you could raise this with Javier https://github.com/latex3/latex2e/issues. Ulrike told me she thinks that hyphenrules should not use internal commands.

[maieul]

Unfortunatly, I have now time now to look on the relationship between all package  for hyphen rules. 

[moewew]

OK. Since this is not a biblatex problem, I'm closing this here.

[moewew]

I complained to the babel developer, but I'm not sure if the report will be considered valid.

[moewew]

babel 3.18 fixes this problem. polyglossia can again use hyphenrules. See latex3/latex2e#17