Am 26.05.2014 um 18:00 schrieb Pablo Rodriguez <oi...@gmx.es>:

> Dear list,
> 
> I have the following sample:
> 
>    \definetype[TeXcode][option=TEX]
>    \def\arg#1{\TeXcode{{#1}}}
>    \starttext
>    \arg{\em\de Textsatzsystem}
> 
>    \TeXcode{{\em\de Textsatzsystem}}
>    \stoptext
> 
> I don’t know what is wrong defined in \arg that inserts an extra space
> after \em?

You can’t do this form a definition for a verbatim command because TeX has its 
own rules
for such a situation (search for a description about catcodes), when you want a 
copy of
\TeXcode add

    \definetype[arg][TeXcode]

to your document.

BTW: \arg is a predefined command and you should avoid to redefine it

Wolfgang
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