% This a very long line which should be typeset to one line even if there'll be overfull hbox

\definetyping[Std][bodyfont=10pt,style=\tt\setupinterlinespace]

\starttext
  \typefile[Std]{TypeFi.mkiv}

  \startcolumns[n=2,rule=on]
    \typefile[Std]{TypeFi.mkiv}
  \stopcolumns
\stoptext