Using the latest nov 14 version of context
i get now separating line between columns.


\startcolumns[n=2,rule=on]
\input knuth
\stopcolumns

Has the syntax changed?


mtx-context     | main context file:
/home/vm/data/context/tex/texmf-context/tex/context/base/mkiv/context.mkxl
mtx-context     | current version: 2019.11.14 17:47