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Hi Joseph,

On Mon, Jun 12, 2017 at 05:01:26PM +0100, Joseph Wright wrote:
>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{https://www.ctan.org}{\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).

Yes, me too. I found another couple of wrong \hbox_set:Nn uses, but
hopefully all of my pkgs on CTAN are ok now.

Alexander