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From: David Carlisle <davidc@NAG.CO.UK>
Subject: Re: array and fontspec issue
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On 16/07/2015 17:54, Stephan Hennig wrote:
> Hi,
>
> the following example, which uses a \fontspec statement in a tabular
> column declaration as per >{}
>

Hmm. Will's call really but the lookahead for optional argument is
what's causing the problem, so a workaround is

\listfiles
\documentclass{article}
\usepackage{fontspec}
\usepackage{array}
\begin{document}
% \begin{tabular}{>{\sffamily}l}% works
% \begin{tabular}{>{\fontfamily{lmss}\selectfont}l}% works
\begin{tabular}{>{\fontspec{Latin Modern Sans}\relax}l}% fails/works
   text
\end{tabular}
\end{document}

David


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