[NTG-context] "Invalid field" in Mark IV

[Hans Hagen]

Flavien Lambert wrote:
> In the following example, it is the ";" that leads to the error
> \def\vect#1{%
>   \overrightarrow{#1}
> }
> \starttext
> $({\rm O};\vect{e_{x}})$
> \stoptext

math-noa.lua:

                             if nc == "po" then
                                 local last_noad = next_noad.next
                                 if last_noad and last_noad.id == 
math_noad and last_noad.subtype == noad_ord then

patch around line 265


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