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From: monardo@cshl.org (Pat Monardo)
Newsgroups: comp.text.tex
Subject: Re: TeX bug: optional spaces are mandatory
Message-ID: <1991Feb10.195425.26669@cshl.org>
Date: 10 Feb 91 19:54:25 GMT
References: <GRABINER.91Feb8124329@zariski.harvard.edu> <1991Feb8.232215.3129@csrd.uiuc.edu> <1991Feb10.070319.17225@news.arc.nasa.gov>
Sender: Pat Monardo
Organization: Cold Spring Harbor Laboratory
Lines: 33

>\afterassignment\showI
>\I=1\ifnum0=\count0\else\fi
>
>%	{\afterassignment}
>%	{\count37}
>%	{\ifnum}
>%	{\else}
>%	{true}
>%	
>%	\showI ->\showthe \I 
>%	{\showthe}
>%	> 1.
>%	\showI ->\showthe \I 
>%	                     
>%	<to be read again> 
>%	                   \relax 
>%	<to be read again> 
>%	                   \else 
>%	l.10 \I=1\ifnum0=\count0\else
>%	                             \fi
>%	? 
>%	
>%	{\relax}
>%	{\else}
>%	{\par}
>% Here, you'll note that {\else} is scanned and pushed back before the
>% {true} is determined. Also, note the surprise appearance of a {\relax}!

the else "relaxes" the scan of the count number. there is no scan
for the count number of \pageno because it is stored in the
symbol for \pageno.

pat