Re: [NTG-context] Bug report, \frac as redefined in m-newmat.tex

[Hans Hagen]

Hi Brooks
The following simple file works fine if I comment out the 
\usemodule[newmat] line, but crashes if I put it in.

  \usemodule[newmat]
  \starttext
  \placeformula
   \startformula
   \eqalign{\frac{1}{2} \cr}
   \stopformula
  \stoptext

ah ... the alignment lookahead problem, i think we can safely patch 
\mathematics to catch lookahead as well as make frac more robust for 
unwanted expansion

\usemodule[newmat]
\unexpanded\def\frac#1#2{\mathematics{\genfrac{}{}{}\donothing{#1}{#2}}}
\def\mathematics#1{\relax\ifmmode#1\else$#1$\fi}
\starttext
\placeformula
\startformula
\eqalign{\frac{1}{2}}
\stopformula
\stoptext 

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