Hans van der Meer wrote:
> After some detective work in which Wolfgang Schuster had a large share
> and has found the most elegant workaround, the addition of a \relax
> just after the description call prevents the error:
> \def\shortanswer#1\par{%
> \par % be sure to end paragraph here
> \answerblock{}% % {} needed here in description call
> \relax % <<<<<<<<<<<<<<<<< \relax prevents crash on if
> \ifanswers #1\else\dotfill\strut\fi
> \par % final \par of description ... \par
> }
>
> The way \relax stops the error reminds me of the \relax that one
> places after a number in order to separate that from the code following.
> I did compare core-des.tex, both the last version and the archived
> from 2007-04-17. But I must admit, I did not succeed finding a clue
> among the differences about what could have happened. The code is a
> bit too intricate to just jump in and pinpoint the culprit -- at least
> for me.
i cannot put a \relax in there because \answerblock looks ahead
the argument grabber handles some of the if's but only the primitives;
in your case ... don't use \ifanswers, just use modes ...
\enablemode[answers] ... \doirmnode{answers}
Hans
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