<div dir="ltr"><div>checking on overleaf, this document gives an error since at least 2014 when l3backend (or in fact the whole of expl3) was not in the format at all</div><div>So I don't think the package breakage is related to any recent l3 changes.<br></div><div><br></div><div>\documentclass{book}<br><br>\usepackage{index}<br><br>\begin{document}<br><br>\chapter{aaa}<br><br>xxx\index{foo}<br>\end{document}</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, 31 Mar 2024 at 12:38, Herbert Schulz via tex-live <<a href="mailto:tex-live@tug.org">tex-live@tug.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Howdy,<br>
<br>
The index package no longer works with the most recent l3backend. It's been around a long time without being updated (last update, a beta, in 2004) and the documentation doesn't seem to list a contact point for the author.<br>
<br>
Good Luck,<br>
<br>
Herb Schulz<br>
<a href="mailto:herbs2@mac.com" target="_blank">herbs2@mac.com</a><br>
<br>
<br>
<br>
</blockquote></div>