xltabular and booktabs failing on "(" -- toprule, midrule, bottomrule only on first column

[Alexander Krumeich]

Sorry, I meant to use xltabular, not tabularx. It's the same result, though:

\documentclass[a4paper]{article}

\usepackage{xltabular}
\usepackage{booktabs}

\begin{document}

\begin{xltabular}{\textwidth}{@{}ll@{}}
  \toprule
  Column 1 & Column 2 \\
  \midrule
 (None) & Other \\
  \bottomrule
\end{xltabular}

\end{document}

On Thu, Nov 14, 2019 at 10:49 AM Alexander Krumeich
<alexander.krumeich at gmail.com> wrote:
>
> Herbert,
>
> thanks for the quick response. I tried changing from tabular* to
> tabularx, but the problem persists. This is the modified MWE:
>
> \documentclass[a4paper]{article}
> \usepackage{xltabular}
> \usepackage{booktabs}
>
> \begin{document}
> \begin{tabularx}{\textwidth}{@{}ll@{}}
>   \toprule
>   Column 1 & Column 2 \\
>   \midrule
>   (None) & Other \\
>   \bottomrule
> \end{tabularx}
> \end{document}
>
> Again: if I remove the opening parenthesis, lualatex (and latex as
> well, btw) compiles the MWE. With the opening parenthesis, however, it
> crashes. This only occurs when the opening parenthesis is immediately
> after either \toprule or \midrule. Subsequent table rows have no
> problem.
>
> The second issue of the original message also persists with tabularx:
> table rules only extend over the first column of the table.
>
> Thanks again for looking into this!
>
> Alexander
>
>
>
> On Tue, Nov 12, 2019 at 6:24 PM Herbert Voss <Herbert.Voss at fu-berlin.de> wrote:
> >
> > Am 12.11.19 um 14:30 schrieb Alexander Krumeich:
> >
> > > there are two bugs in the booktabs package, that might have been caused
> > > by the October update to booktabs.
> > >
> > > Consider the following example:
> > >
> > > \documentclass[a4paper]{article}
> > >
> > > \usepackage{xltabular}
> > > \usepackage{booktabs}
> > >
> > > \begin{document}
> > >
> > > \begin{tabular*}{\textwidth}{@{}ll@{}}
> > >    \toprule
> > >    Column 1 & Column 2 \\
> > >    \midrule
> > >    (None) & Other \\
> > >    \bottomrule
> > > \end{tabular*}
> > >
> > > \end{document}
> > >
> > > The first bug:
> > > LuaLaTeX crashes with this error:
> > >
> > > ! Undefined control sequence.
> > > <argument> ...al \expandafter \let \cmrsideswitch
> > >                                                    \@tempa \fi \fi
> > > l.13   (None)
> >
> > Loading package xltabular and using tabular* will not work. Use
> > environment xltabular instead or
> >
> >
> > \documentclass[a4paper]{article}
> >
> > \usepackage{xltabular}
> > \usepackage{booktabs}
> >
> > \begin{document}
> >
> > \let\xltabular\undefined
> > \begin{tabular*}{\textwidth}{@{}ll@{}}\toprule
> > Column 1 & Column 2 \\\midrule\relax
> > (None) & Other \\\bottomrule
> > \end{tabular*}
> >
> > \end{document}
> >
> >
> > Herbert