colors

[Gérald Tenenbaum]

Hello,

Here is a small file that used to work but doesn't anymore:

\input eplain
\beginpackages
\usepackage{color}
\endpackages
\long\def\red#1{{\color{red}#1}}
\red{ab}
\bye


The error message is:

This is pdfTeX, Version 3.141592653-2.6-1.40.24 (TeX Live 2022) 
(preloaded format=pdftex)
  restricted \write18 enabled.
entering extended mode
(./essai.tex (/usr/local/texlive/2022/texmf-dist/tex/eplain/eplain.tex)
(/usr/local/texlive/2022/texmf-dist/tex/plain/graphics-pln/miniltx.tex)
(/usr/local/texlive/2022/texmf-dist/tex/latex/graphics/color.sty
(/usr/local/texlive/2022/texmf-dist/tex/latex/graphics-cfg/color.cfg)
(/usr/local/texlive/2022/texmf-dist/tex/latex/graphics-def/pdftex.def)
(/usr/local/texlive/2022/texmf-dist/tex/latex/graphics/mathcolor.ltx
/usr/local/texlive/2022/texmf-dist/tex/latex/graphics/mathcolor.ltx:21: 
Undefined control sequence.
l.21 \ExplSyntaxOn

Many thanks for help.
Regards,

Gérald
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