On 9/11/2017 6:59 AM, Henri wrote:
Dear devs,

Thank you very much for fixing this one
https://mailman.ntg.nl/pipermail/ntg-context/2017/089790.html
Unfortunately it seems like you broke substack and mathmatrix on the way.  MWE 
below fails
with version 2017.09.08 17:24

Cheers, Henri

---

\starttext

\placeformula
\startformula
   \sum_{\startsubstack
     \NC k \NR
     \NC \omega_n \NR
   \stopsubstack}
\stopformula

\placeformula
\startformula
   \startmathmatrix[left=\left|,right=\right|]
     \NC 0 \NC 1 \NR
     \NC 1 \NC 0 \NR
   \stopmathmatrix
   = -1 .
\stopformula

\stoptext
% no tagging yet : how is it supposed to be coded? no time now anyway

\unexpanded\def\startsubstack
  {\begingroup
   \vcenter\bgroup
   \baselineskip\mathstacktotal
   \lineskip\mathstackvgap
   \lineskiplimit\lineskip
   \mathsurround\zeropoint
   \everycr\emptytoks
   \let\NC\relax
   \let\MC\relax
   \let\NR\crcr

\halign\bgroup\hfil\normalstartimath\scriptstyle\alignmark\alignmark\normalstopimath\hfil\crcr}

\def\stopsubstack
  {\crcr
   \egroup
   \egroup
   \endgroup}


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