Hi, i found the following bug (likely) some time ago:
When \textext (or any other text generating thing like btex etex etc.) is
present inside \*MPinclusions and \*MPinclusions are followed by \*MPcode
ConTeXt returns error:
Equation cannot be performed (color=vacuous).
Minimal example would be:
\startMPinclusions
picture p;
p := image(
draw textext("Foo");
);
\stopMPinclusions
\startMPcode
\stopMPcode
tested on http://live.contextgarden.net/
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