Latex writer: Longtable Undefined control sequence

[nylnx]

There is a bug, which happens, if you start a table-cell with parentheses inside a longtable. Something like this will be produced by the Latex writer. This is a minimal failing example not directly from Pandoc, but the longtable is a product of Pandoc. Execute it with latex.

\documentclass{article}
\usepackage{longtable,booktabs}

\begin{document}
\begin{longtable}[]{@{}c@{}}
\toprule
(something in parentheses) \\
\midrule
\endhead
\bottomrule
\end{longtable}
\end{document}

This throws an error with "Undefined control sequence..." as described on Stackexchange: "Undefined control sequence" on left parenthesis after midrule in longtable.

In my opinion there is a simple fix with putting a \relax after \midrule, \toprule and maybe others, since you never have any arguments anyway. This would prevent that error from happening.

Pandoc version: 2.16.2

[jgm]

I got some bad results using \relax, but just putting () after these commands seems to work.

[jgm]

Test case

% pandoc -o table.pdf
| (hi) |
|------|
| oo   |
^D

[bollenn]

As commented in 5f0bfd4#commitcomment-72500256 the fix for this issue breaks the workarounds in #7421 (comment), do you have any ideas on fixing this?

[Paladnix]

I used 2.19.2 and got () at first row after the midrule, how to deal?

As commented in 5f0bfd4#commitcomment-72500256 the fix for this issue breaks the workarounds in #7421 (comment), do you have any ideas on fixing this?

I used 2.19.2 and got () at first row after the midrule, how to deal?