I used to pass (color) parameters to \startuseMPgraphic with:
\startuseMPgraphic{square}{acolor}
draw unitsquare withcolor \MPvar{acolor}; % or \MPcolor{acolor}
In both cases I get the following error:
metapost > initializing instance 'metafun' using format 'metafun'
metapost > loading 'metafun' as
'/Users/hansm/TeX/context-09/tex/texmf-context/metapost/context/base/metafun.mpiv'
using method 'default'
metapost > initializing number mode 'scaled'
check > missing or ungrouped '=' after 'green' in line '7
(442>square:)'
Has something changed in this mechanism of parameter use, or am I doing
something wrong?
Hans van der Meer
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