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Date:         Wed, 9 Aug 2017 01:18:32 +0200
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From:         Benjamin Berg <benjamin@SIPSOLUTIONS.NET>
Subject: Re: \hbox_set:Nn issue after expl3 [2017/05/13] update
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Status: R

Hello,

just ran into the same issue myself. I haven't been able to solve my
usage yet but noticed in the processes that \vbox_set_top:Nw seems to
be still missing.

Regards,
Benjamin

On Wed, 2017-06-07 at 11:21 +0100, 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. In the above, \hbox_set:Nn is
> wrong (even if we ignore using "0" not a box name). For me
> 
>   \href{https://www.ctan.org}{\dots
>     \hbox_set:Nw 0 CTAN    % broken since expl3 [2017/05/13]
>   %  \setbox0=\hbox\bgroup CTAN  % hot-fix
>     \hbox_set_end:
>     \box_use:N0
>   \dots}
> 
> works and is using the appropriate interface.
> 
> Joseph
> 
> P.S. I'm meant to be adding \hbox_set_to_wd:Nnw, etc., as those are
> currently not covered: will aim to do today/tomorrow.
>