test/command/5740.md


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```
% pandoc -t latex
\newcommand\parenthesize[1][x]{(#1)}
$\parenthesize$, $\parenthesize[y]$, $\parenthesize[\textsc{head}]$
^D
\newcommand\parenthesize[1][x]{(#1)}

\((x)\), \((y)\), \((\textsc{head})\)
```