hi,
just encountered an expansion problem with color inside drawoptions...
% engine=luatex
\starttext
\startuniqueMPgraphic{foo}
begingroup
save c ; color c[] ;
c0:= red;
drawoptions(withcolor c0);
fill OverlayBox;
endgroup;
\stopuniqueMPgraphic
\defineoverlay[foo][\uniqueMPgraphic{foo}]
\framed[width=10cm,background=foo]{}
\stoptext
regards, peter
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