Am 18.04.2013 um 14:55 schrieb "Meer, H. van der" <h.vanderm...@uva.nl>:
> There seems something very much amiss with \halign in later ConTeXt versions.
>
> This typesets fine in PlainTeX and is an example taken from a textbook.
>
> \tabskip=1em\halign{%
> \hfil\it#\hfil&\hfil#\hfil&#&\hfil#\crA&B&C&D\cr}
>
> Also in contextversion 2012.05.30 (from a TeXlive distribution).
>
> But it fails at least in ConTeXt ver: 2013.03.20 10:34 MKIV
> and in ConTeXt ver: 2013.04.16 12:08 MKIV beta
> with the following error
>
> ! Only one # is allowed per tab.
> system > tex > error on line 5 in file fixedwidth.tex: Only one # is
> allowed per tab ...
>
> 1 \starttext
> 2 contextversion=\contextversion\par
> 3 \tabskip=1em
> 4 \halign{%
> 5 >> \hfil\it#\hfil&\hfil#\hfil&#&\hfil#\cr
> 6 A&B&C&D\cr}
> 7 \stoptext
> l.5 \hfil\it#\hfil&\hfil#
> \hfil&#&\hfil#\cr
>
> Why? How primitive it may be, I would like to use \halign now and then.
The error message is misleading because the problem is & and not #.
One of the changes for MkIV was to make _, ^ and & normal characters
in the document (the first two still works for math). For code writing this
doesn’t matter because & has it’s normal meaning when you use
\unprotect … \protect but it can’t be used in the document.
Wolfgang
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