bachotex2009-hans-taco-pearl2.tex
bachotex2009-hans-taco-pearl2.tex
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TeX document,
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%%% Null control sequence
% When you do:
\endlinechar=-1
\let\x\
% the macro \x is undefined\dots
% Actually \x becomes equal to the 'null control sequence' that
% you would get from
\expandafter\def\csname\endcsname{}
% but that is usually undefined.
% And you can even use this effect to assign to the null control
% sequence without needing \expandafter:
\endlinechar=-1
\gdef\
{\message{NULL CS}}
\csname\endcsname
\end
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