On Wed, 9 Sep 2009, Chen Shen wrote:

Hi,
There seems to be a new problem with mathalign, as in the minimal sample
below:
Thanks a lot.

%%%%%%%%%
\starttext
\startformula
\startalign
 \NC a \NC = b + c \NR
\stopalign
\stopformula
\stoptext
%%%%%%%%%

Version:
This is LuaTeX, Version beta-0.43.0-2009081911
ConTeXt  ver: 2009.09.09 12:49 MKIV  fmt: 2009.9.9  int: english/english

Error message:
! Improper \halign inside $$'s.
\dobothaligneqalignno ...group }\fi \fi #1\halign
                                                 \ifcase \eqalignmode \or
t...
<to be read again>
                  \NC
l.4   \NC
         a \NC = b + c \NR


Seems to be an engine problem:

\starttext
$$ \halign{# \cr a \cr b \cr} $$
\stoptext

Aditya
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