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.
Jim
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