Thank you. But isn't \donknuthmode suppose to keep the compatibility with standard tex? Eythan Wolfgang Schuster Sat, 14 Jul 2012 17:39:12 +0200 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 ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___________________________________________________________________________________