plain TeX: undefined control sequence \protected

Rodolfo Medina rodolfo.medina at
Fri Dec 2 14:27:03 CET 2022

David Carlisle <d.p.carlisle at> writes:

> 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

Well, thanks, but then I get a different 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
! Undefined control sequence.
l.18 \ifcsname
               mathcolor\endcsname \endinput \fi


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