Found the origin of the curious error message containing my name. Comes from the inclusion of a file named type-loc.mkiv residing in a directory ~/TeX/texmf/tex/context/user/ and containing:
\endinput Op NTG ConTeXt nieuwsgroep, antwoord van Hans Hagen. On 1/3/2014 2:33 PM, H. van der Meer wrote: (etc.) How this got included? I have no idea. But removing it did not make a difference, even after calling mtxrun --generate. > On 10 Jun 2019, at 22:21, Hans van der Meer <havdm...@ziggo.nl> wrote: > >> >> On 10 Jun 2019, at 12:04, Hans van der Meer <havdm...@ziggo.nl >> <mailto:havdm...@ziggo.nl>> wrote: >> >> This looks to me as an error in the LMTX distribution: >> >> tex error > tex error on line 6 in file >> /Users/hansm/TeX/context-lmtx/tex/texmf-context/tex/context/fonts/mkiv/type-imp-dejavu.mkiv: >> ! Missing } inserted >> >> <inserted text> >> } >> <to be read again> >> \aligntab >> l.6 fontclass\aligntab >> \fontclass\cr >> >> Because running under my old ConTeXtBeta does not aborts with the error. >> system > ConTeXt ver: 2019.06.01 19:11 MKIV beta fmt: 2019.6.4 >> int: english/english >> >> I looked into that file but could not see what causes the error. > > I did some more research and as a result now wonder what is happening. > > The error occurred in this piece of code of mine: > > \tabskip=1em\halign{% > \alignmark\hfil\aligntab\alignmark\hfil\cr > fontclass\aligntab\fontclass\cr > Regular\aligntab\truefontname{Regular}\cr > } > > \aligntab and \alignmark were advertised as LuaTeX equivalents for & and # > respectively. > > Then I took the following example from Victor Eijkhout's book "TeX by Topic", > page 197, last example. > That surely should work, was the idea. > > \starttext > \halign{a#&b#&c#\cr 1&2\cr 1\cr} > \stoptext > > However this fails! How can such a basic example in pure TeX fail? I wonder > and am curious what is happening here. > > This is LuaMetaTeX, Version 2.00.0 > tex error > tex error on line 3 in file > /Users/hansm/TeX/texmf/tex/context/user/type-loc.mkiv: ! Only one # is > allowed per tab > > l.3 \halign{a#&b# > &c#\cr 1&2\cr 1\cr} > > 1 \endinput > 2 > 3 >> Op NTG ConTeXt nieuwsgroep, antwoord van Hans Hagen. > 4 > 5 On 1/3/2014 2:33 PM, H. van der Meer wrote: > 6 Has someone an idee what causes the unknown library message as in the > 7 log below? Is it harmful? > 8 > 9 fonts > typescripts > unknown library 'loc' > 10 > 11 you can add a file type-loc.mkiv someplace in your local tree with > 12 > 13 % dummy file > > There should be exactly one # between &'s, when an > \halign or \valign is being set up. In this case you had > more than one, so I'm ignoring all but the first. > > mtx-context | fatal error: return code: 256 > > and using \alignmark and \aligntab this results in: > > \starttext > \halign{a\alignmark\aligntab b\alignmark\aligntab c\alignmark\cr 1\aligntab > 2\cr 1\cr} > \stoptext > > And I am most curious how my name could turn up in the error message produced! > > tex error > tex error on line 3 in file > /Users/hansm/TeX/texmf/tex/context/user/type-loc.mkiv: ! Missing } inserted > > <inserted text> > } > <to be read again> > \aligntab > l.3 ...\alignmark\aligntab c\alignmark\cr 1\aligntab > 2\cr 1\cr} > > 1 \endinput > 2 > 3 >> Op NTG ConTeXt nieuwsgroep, antwoord van Hans Hagen. > 4 > 5 On 1/3/2014 2:33 PM, H. van der Meer wrote: > 6 Has someone an idee what causes the unknown library message as in the > 7 log below? Is it harmful? > 8 > 9 fonts > typescripts > unknown library 'loc' > 10 > 11 you can add a file type-loc.mkiv someplace in your local tree with > 12 > 13 % dummy file > > I've put in what seems to be necessary to fix > the current column of the current alignment. > Try to go on, since this might almost work. > > mtx-context | fatal error: return code: 256 > > > >> >> dr. 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