There is the following problem on code that did work around july 2007,
but no longer under the current context version (2008-03-11).
Define a description, I did:
\definedescription[answerblock][%
\c!margin=\v!no,\c!location=\v!left,%
\c!headstyle=\@@exmintrostyle,\c!style=\@@exmstyle,%
\c!before=,\c!inbetween=,\c!after=,%
\c!hang=\@@exmhang,\c!width=\questionblockwidth,%
\c!text=\placeanswerstart]
Typeset with this description inside the following macro:
\def\shortanswer#1\par{%
\par % be sure to end paragraph here
\answerblock{}% % {} needed here in description call
\ifanswers #1\else\dotfill\strut\fi % <<<<<< crashing on this if
\par % final \par of description ... \par
}
The above code crashes with: ! Incomplete \ifx; all text was ignored
after ...
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.
Allthough Wolfgang's workaround saves the day, I feel this problem
deserves solving inside ConTeXt, not outside it. Someday somewhere
another person will stumble on the same problem -- a situation that
can and should be avoided, in my view.
Therefore I explain the problem here as fully as possible hoping
someone knowledgeable with descriptions <<we might need to fall back
to Taco or Hans>> will find the best remedy.
Hans van der Meer
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