plain TeX: undefined control sequence \protected

[David Carlisle]

having said that, graphics-pln does mostly avoid  \protected so you could
change line 548 from

 \protected\def\mathcolor

to

\csname protected\endcsname\def\mathcolor

I'll make a ctan update

David


On Thu, 1 Dec 2022 at 12:15, David Carlisle <d.p.carlisle at gmail.com> wrote:

> use pdftex, or etex (or \let\protected=\relax)
>
> Davd
>
>
> On Thu, 1 Dec 2022 at 12:00, Rodolfo Medina <rodolfo.medina at gmail.com>
> wrote:
>
>> Hi all.
>>
>> After upgrading TeXlive in my Debian system, the simple folowing example:
>>
>> \input color
>>
>> hallo
>>
>> \vfill\eject\end
>>
>> processed with simply `tex test, produces the following error:
>>
>> $ tex test
>> This is TeX, Version 3.141592653 (TeX Live 2022/Debian) (preloaded
>> format=tex)
>> (./test.tex
>> (/usr/share/texlive/texmf-dist/tex/plain/graphics-pln/color.tex
>> (/usr/share/texlive/texmf-dist/tex/plain/graphics-pln/miniltx.tex
>> ! Undefined control sequence.
>> l.548   \protected
>>                   \def\mathcolor{\begingroup\@ifnextchar[\mlx at mathcolora
>> \mlx...
>>
>> ?
>>
>>
>> Please help with this issue.
>>
>> Thanks,
>>
>> Rodolfo
>>
>>
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