Am 01.06.2011 um 15:26 schrieb Mojca Miklavec:
> Dear magitians,
>
> I discovered this in LaTeX, but ConTeXt behaves the same (plain TeX
> behaves differently). Can somebody please explain me why this code
> fails to work? (A workaround is to move \newif on top which I'm
> willing to do, but I'm still curious.)
>
> \starttext
>
> \ifx\hbox\undefined
> \message{invisible to tex}
> \newif\ifabc \abcfalse
> \ifabc \message{abc true breaks} \else \message{abc false breaks} \fi
> \fi
>
> \stoptext
>
>
> systems : begin file iftest at line 1
> abc false breaks
> ! Extra \fi.
> l.7 \fi
The \ifx ends with the first \fi from \ifabc which isn’t defined and
ignored by TeX, the last \fi is left which generates the error message
Wolfgang
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