\starttext x \rightarrowfill x x \leftarrowfill x hbox to 5cm: y\hbox to5cm{\rightarrowfill}y y\hbox to5cm{\leftarrowfill}y \stoptext But obviously not in an dimensioned \hbox, whereas Knuth's version does that too.
yours sincerely dr. Hans van der Meer |
hboxarrowfill.pdf
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