[texhax] tabu* and LuaTeX

Arno Trautmann Arno.Trautmann at gmx.de
Mon Nov 14 12:22:17 CET 2011

Hi all,

I have troubles using the tabu* environment from the tabu package to 
typeset verbatim material using LuaLaTeX. The following example:



  & test \\

results in an error:

./test.tex:10: Extra }, or forgotten $.
<recently read> \egroup

l.10 \end{tabu*}


I think I could isolate the error to \scantokens. This is used by tabu, 
and the above example works (!) with pdfLaTeX as well as XeLaTeX. So I 
consulted the LuaTeX manual and found 2.7.4 about \scantextokens. Well, 
I tried to be very “clever” and \let\scantokens\luatexscantextokens, but 
the error remains. (Of course XeTeX and pdfTeX now fail)

so … what's going on here? Is this a bug in LuaTeXs \scantokens that 
behaves differently from the ε-TeX version? Or is something wrong with 
the LuaLaTeX setup? Did the package author miss anything? Or, most 
probably, am I doing something wrong?

I'd be happy about any comment, be it explanations, workarounds or even 
full bugfixes ;)


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