I use the context minimal with updating to lastest beta. when using $\doteq$
in my equation, texexec catch an error:

! Illegal unit of measure (pt inserted).
<to be read again>
\buildrel ...mathrel {\mathop {\kern \zerocount #2
                                                  }\limits ^{#1}}
l.3 Test $\doteq

I check the definition in math-pln.mkii, the \doteq is defined as:


The problem seems caused by \zerocount. After comparing with the definition
in math-pln.mkiv, I changed it to \zeropoint and texexec run successfully.

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