On Tue, Jun 2, 2026 at 22:30 (+0200), Wolfgang Schuster wrote:
> Am 02.06.2026 um 13:46 schrieb Jim via ntg-context:
>> Hi all,
>> someone (who may or may not wish to remain nameless) wanted to create a
>> two-sided version of ANSS-CE, so he added/changed a couple of lines in the
>> environment file and ran context.
>> His changes causes context to spit out this error:
>> tex error > tex error on line 90 in file
>> 00_FrontMatter/a02_Preface.tex:
>> lua error:
>> registered function call [272]:
>> ...ods/tex/texmf-context/tex/context/base/mkxl/layo-ini.lmt:69: attempt to
>> perform arithmetic on a boolean value
>> This line is
>> return not (r or texgetcount(c_realpageno)) % 2 == 0
>> If I change the line to
>> return not ((r or texgetcount(c_realpageno)) % 2 == 0)
>> everything works (apparently) fine.
>> Regardless of whether the statements added to the ANSS-CE environment file
>> were correct, I think the function has an issue which should be fixed.
>> I don't know whether this is the "correct" fix or not, but FWIW, here it is.
>> I am surprised by two things here:
>> (1) The file layo-ini.lmt in my ConTeXt standalone is the same as the one
>> in TL2025, so the file hasn't changed recently. And yet surely this is
>> not the first time someone tried to create a double-sided document.
>> What peculiarity of ANSS-CE causes this function to get called with a
>> nil argument when apparently it isn't a problem for other documents?
>> (2) In a document of 357 pages, this function is only called 31 times.
>> I might have guessed it would be called for every page. If it is
>> called only when some other combination of "unusual" things happens,
>> this might (partially) explain (1). But I wonder what this unusual
>> combination is.
>> Sadly, ANSS-CE is not a MWE for anyone's idea of "minimal". I could send
>> along the changes to the environment file which reveals this problem, if
>> anyone is interested.
> Your minimal example:
> \setuppagenumbering[alternative=doublesided]
> \setupuserpagenumber[number=2]
> \starttext
> \inmargin{ }
> \stoptext
> Wolfgang
Nice! 112 characters vs. 976790, which gives a 99.988+% reduction in size.
That's probably some sort of record.
Jim
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