From e0c6872cf40896c7be36b11dcc744620f10adf1d Mon Sep 17 00:00:00 2001 From: Norbert Preining Date: Mon, 2 Sep 2019 13:46:59 +0900 Subject: Initial commit --- info/challenges/aro-bend/answer.009 | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 info/challenges/aro-bend/answer.009 (limited to 'info/challenges/aro-bend/answer.009') diff --git a/info/challenges/aro-bend/answer.009 b/info/challenges/aro-bend/answer.009 new file mode 100644 index 0000000000..b422ef181b --- /dev/null +++ b/info/challenges/aro-bend/answer.009 @@ -0,0 +1,30 @@ +Date: 07 Jul 1993 12:45:34 -0400 (EDT) +From: Michael Downes +Subject: Around the Bend #9, answer +Sender: ITeX-Mgr@SHSU.edu +To: info-tex@shsu.edu +Reply-to: Michael Downes +Message-id: <742063535.36965.MJD@math.ams.org> +X-ListName: TeX-Related Network Discussion List + +"In internal vertical mode, if the preceding item on the list is a +"vbox, can you do this: \unvbox\lastbox? + +The answer is no. If you tried it, you would have seen the error +message: + + ! Missing number, treated as zero. + + \lastbox + l.3 \unvbox\lastbox + + ? h + A number should have been here; I inserted `0'. + (If you can't figure out why I needed to see a number, + look up `weird error' in the index to The TeXbook.) + +\lastbox does not return a box register number, which is what \unvbox +requires; instead, \lastbox returns a object in the sense of the +TeXbook, chapter 24, p 278. There are only a few TeX commands that +accept a object as their argument (\shipout, \setbox, \leaders, +...), and \unvbox is not one of them. -- cgit v1.2.3