What am I doing wrong here, please?
\starttext
\frac{1}{2}
\stoptext
gives
tex error > tex error on line 2 in file ./tt.tex: Missing $ inserted
<inserted text>
$\mathatom
<macro> \math_atom_by_parameter_indeed
#1->\mathatom
\s!class \mathcodechecked {#1}
<macro> \math_frac
...meter #2\or \setupcurrentmathfraction [#2]\fi \edef \p_math_fraction_fences {\mathfractionparameter \c!fences }\dostarttagged \t!mfractionstack {\mathfractionparameter \c!mathmeaning }\math_atom_by_parameter \mathfractionparameter
\bgroup \ifem ...
<to be read again>
{