In a math-oriented document, I'm using glossaries to link most in-text mathematical symbols to their meaning in the glossary at the front of the document. Using different subscripts/superscripts doesn't really change their meaning, and so I re-use that entry (and also to prevent the glossary list from growing to unwieldy lengths). Different symbols have different default subscripts, so I use the user1 field to store the default, and used a slightly modified solution of https://tex.stackexchange.com/a/229879/221009.
When I nest a \gls call inside the optional argument of another \gls call, I get the following compile error with xelatex:
! TeX capacity exceeded, sorry [semantic nest size=500].
<recently read> {
l.37 $\gls{A}$ and $\gls{A}[x, \gls{B}]
$;
This compile error is generated from this MWE
\documentclass{article}
\usepackage{hyperref}
\usepackage{glossaries-extra}
\renewcommand{\glossarysection}[2][]{}
\glsnoexpandfields{}
\glspatchtabularx{}
\makeglossaries{}
\newcommand*{\glsarg}{} % default glossary argument
\defglsentryfmt{%
\let\orgglsarg\glsarg%
\ifdefempty\glsinsert%
{\glsfieldfetch{\glslabel}{useri}{\glsarg}}%
{%
\let\glsarg\glsinsert%
\let\glsinsert\relax%
}%
\glsgenentryfmt%
\let\glsarg\orgglsarg%
}
\newglossaryentry{A}{description={Some mathematical symbol}, name={\ensuremath{A_{i}}}, text={\ensuremath{A_{\glsarg}}}, user1={i}}
\newglossaryentry{B}{description={Another mathematical symbol}, name={\ensuremath{B_{i}}}, text={\ensuremath{B_{\glsarg}}}, user1={i}}
\begin{document}
\printglossary
\section{My text}
$\gls{A}$ and $\gls{A}[x, \gls{B}]$;
\end{document}
Full mwe.log file:
This is XeTeX, Version 3.14159265-2.6-0.999991 (TeX Live 2019/Debian) (preloaded format=xelatex 2021.7.14) 14 AUG 2021 13:51
entering extended mode
restricted \write18 enabled.
%&-line parsing enabled.
**mwe
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! TeX capacity exceeded, sorry [semantic nest size=500].
<recently read> {
l.30 $\gls{A}$ and $\gls{A}[x, \gls{B}]
$;
If you really absolutely need more capacity,
you can ask a wizard to enlarge me.
Here is how much of TeX's memory you used:
14056 strings out of 479819
218295 string characters out of 5895846
668191 words of memory out of 5000000
31001 multiletter control sequences out of 15000+600000
533192 words of font info for 32 fonts, out of 8000000 for 9000
1348 hyphenation exceptions out of 8191
1177i,500n,2343p,998b,20874s stack positions out of 30000i,500n,10000p,200000b,80000s
No pages of output.
What is happening (I think some recursion is going wrong?), and how can it be fixed?
