[texhax] Some puzzling TeX

Uwe Lueck uwe.lueck at web.de
Sat Feb 19 11:23:02 CET 2011

\"Heiko Oberdiek" <heiko.oberdiek at googlemail.com> wrote 17.02.2011 01:48:29
> On Thu, Feb 17, 2011 at 12:44:25PM +1300, Rod Harries wrote:
>> I am trying to understand why  one would write
>> \def\:{\let\@sptoken= } \: %
> It can also be done without an extra definition:
> \@firstofone{\let\@sptoken= } %

That is remarkable, Heiko (tested!). 
Is this your discovery, or have you seen it elsewhere? 
It could be a proposal for latex.ltx.

Likewise, the next line in latex.ltx,

    \def\:{\@xifnch} \expandafter\def\: {\futurelet\@let at token\@ifnch}

could be replaced by 

    \@firstofone{\def\@xifnch} {\futurelet\@let at token\@ifnch}




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