Is there a different approach to use boxes.mp?
MNWE:
\startMPpage
input boxes.mp;
boxit.bl("left");
boxit.br("right");
br.sw - bl.ne = (20,0);
drawboxed(bl,br);
\stopMPpage
LOG snippets:
system > ConTeXt ver: 2020.04.10 19:11 MKIV beta fmt: 2020.4.19
int: english/english
metapost log > loading metafun, including plain.mp version 1.004 for metafun
iv and xl
metapost log >
metapost log > >> _dojoin
metapost log > ! Isolated expression.
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