[NTG-context] Stacking math symbols

23 Feb 2016

      I find it a bit surprising that ConTeXt gives 'missing } inserted'
with:

\starttext\startformula
\mathop=^{\rm def}
\stopformula\stoptext

(\mathop{=}^... is fine, though).

The above formula is correct in Plain (Lua)TeX (in fact, it is
copied from The TeX Book). Why does ConTeXt need braces?

(Before you point it out: I know that I should use \stackrel…)

Nicola