[NTG-context] Bug with \wordright in LMTX version 2020-08-03 14:25

Hans Hagen j.hagen at xs4all.nl
Tue Aug 4 09:06:14 CEST 2020

On 8/3/2020 10:10 PM, Otared Kavian wrote:
> Hi Hans,
> A file which used to be typeset correctly with the previous versions of lmtx, now produces an error. Despite the error message being extremely cryptic:
> Error	   ! Missing number, treated as zero
> I could guess the origin of the bug, which seems to be \wordright,  but although the following minimal example shows a bug it does not produce the same ERROR output page:
> %%%% the square ''end of proof''
> \definesymbol[Fin][\mathematics{\square}]
> \def\qed{\wordright{\symbol[Fin]}}
> \starttext
> \startformula
> a^2 + b^2 = c^2
> \stopformula
> \qed % the problem is here
> \stoptext
> In the above example if one adds something before \qed, then the square end-of-proof appears.
> However in my real file ConTeXt ouputs an error page and says: Error	   ! Missing number, treated as zero.
One can debate if the old behavior was ok ... wordright is meant for 
adding something at the end of a paragraph and you have none here. You 
can add a \strut in your definition to force a line.

The lmtx implementation actually permit this:


a^2 + b^2 = c^2
\qed % the problem is here

i'm still exploring this but it has to do with collecting stuff, as in:

\wordright{before} test \par

test \wordright{before} \par

(i'll look at the number issue which indeed looks a like a bug)

                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl

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