\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.



On 22 Jun 2023, at 15:11, Hans Hagen via ntg-context <ntg-context@ntg.nl> wrote:

   x \rightarrowfill x

   x \leftarrowfill x

yours sincerely
dr. Hans van der Meer

Attachment: hboxarrowfill.pdf
Description: Adobe PDF document

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