\language				[en]
\protectbufferstrue

% \usemodule[nath]
% If placed above \startMPenvironment[+], delimiter sizing won't work
\startMPenvironment[+]
\setupbodyfont[10pt]
\setupbodyfontenvironment[default][em=italic]
\stopMPenvironment
\usemodule [nath]

%:Layout
%:-
\starttext
\[ f_n \to_{\text{subscript doesn't work}} f	\\
f_n	\to^{\text{superscript does}} f\]

\[ (\sum_{n=1}^\infty \frac{a}{b})\]

\[ \binom{a}{b} \]
%\[ \binom{\frac 12}{b} \]
% binom doesn't work with fractions
\stoptext 