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Sender: Mailing list for the LaTeX3 project <[log in to unmask]>
Date: Mon, 12 Jun 2017 17:01:26 +0100
Reply-To: Mailing list for the LaTeX3 project <[log in to unmask]>
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From: Joseph Wright <[log in to unmask]>
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On 07/06/2017 11:21, Joseph Wright wrote:
> On 07/06/2017 11:14, Alexander Grahn wrote:
>> Good afternoon,
>> the recent version change of expl3 from [2017/04/01] (last TL-16 state) to
>> [2017/05/13] (initial TL-17 state) changed the behaviour of \hbox_s:Nn, which
>> made a hot-fix necessary for one of my packages (ocgx2) on CTAN.
>> The problem boils down to the following code, which used to work with expl3 as
>> of v. 2017/04/01, but fails now with `! Missing } inserted.' error.
>>   \documentclass{article}
>>   \usepackage{hyperref}
>>   \usepackage{expl3}
>>   \ExplSyntaxOn
>>   \begin{document}
>>   \href{}{\dots
>>     \hbox_set:Nn0\bgroup CTAN    % broken since expl3 [2017/05/13]
>>   %  \setbox0=\hbox\bgroup CTAN  % hot-fix
>>     \egroup\box_use:N0
>>   \dots}
>>   \end{document}
>> I would like to return to using \hbox_set:Nn instead of \setbox.
>> Alexander
> Hi Alexander,
> I had an issue in siunitx which I also had to fix for this update: for
> me it boiled down to having made some implementation assumptions and
> ending up mixing different interfaces. 

Indeed, I've found I had a few more of these which I need to fix! It's
easy enough to assume primitive behaviour but really not a great plan: I
think in my own case the code goes back to before I joined the team (and
was feeling my way through the TeX <-> expl3 situation).