Am 14.07.2012 um 17:20 schrieb Eythan Weg:
> Hi,
>
> I run into trouble with mkiv (ConTeXt ver:
> 2012.05.30 11:26 MKIV fmt: 2012.7.7 int:
> english/english).
>
> A small example:
> \starttext
> \def\c#1#2{\halign{##\hfil&##\cr\bf#1&\quad#2\cr}}
> \c{11}{this}
> \stoptext
>
> gives and error:
>
> ! Only one # is allowed per tab.
>
> This runs error-free under mkii (pdftex, xetex), plain tex
> (luatex, xetex), latex (luatex) etc.
>
> Would someone comment?
The error message is not very helpful in this case because the & is the problem.
In MkIV we made a while ago _, ^ and & normal characters in the text and you
don’t have to write \_ (or \textunderscore) etc. to use them. A side effect of
this
was that \halign can’t be used anymore in a document (which isn’t recommended
anyway because ConTeXt has other high level table interfaces), when you now
want to use \halign to create a command put it in a \unprotect … \protect block
or use the \aligntab (it’s a LuaTeX primitive with the same meaning as &).
\unprotect
\def\one#1#2{\halign{##\hfil&##\cr\bf#1&\quad#2\cr}}
\protect
\def\two#1#2{\halign{##\hfil\aligntab##\cr\bf#1\aligntab\quad#2\cr}}
\starttext
\one{underscore}{_}
\two{ampersand}{&}
\stoptext
BTW: \c is already defined as a accent macro.
Wolfgang
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