[lltx] \scantokens differs between LaTeX and plain?
Ulrike Fischer
news3 at nililand.de
Tue Nov 15 16:40:01 CET 2011
Am Tue, 15 Nov 2011 10:18:40 +0100 schrieb Arno Trautmann:
> Hi all!
>
> [moving this thread from texhax]
>
> After I had trouble with the tabu package, Philipp Stephani posted the
> following minimal example on texhax that causes the problem.
The error is the one you get if you add a \par in $...$. You can
simplify the problem
\documentclass{minimal}
\begin{document}
$^^J$
a\scantokens{$^^J$}
\end{document}
In this case the \par in \end{document} will trigger the error as
you can see if you enlarge \errorcontextlines:
! Missing $ inserted.
<inserted text>
$
<to be read again>
\par
\newpage ...k \@nobreakfalse \everypar {}\fi \par
\vfil \penalty
....
l.9 \end{document}
If you put braces around the \scantokens: {\scantokens{$^^J$}}
then one get a ! Extra }, or forgotten $. error.
So in my opinion for some reason the ending "$" is not seen.
The problem seems to be related to \newlinechar: It disappears if
one reset \newlinechar (and then appears for the new value):
\documentclass{minimal}
\begin{document}
\newlinechar`\A
a{\scantokens{$^^J$}}
%\scantokens{$A$}
\end{document}
--
Ulrike Fischer
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