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author | Norbert Preining <norbert@preining.info> | 2019-09-02 13:46:59 +0900 |
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committer | Norbert Preining <norbert@preining.info> | 2019-09-02 13:46:59 +0900 |
commit | e0c6872cf40896c7be36b11dcc744620f10adf1d (patch) | |
tree | 60335e10d2f4354b0674ec22d7b53f0f8abee672 /info/challenges/aro-bend/answer.009 |
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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 <MJD@MATH.AMS.ORG> +Subject: Around the Bend #9, answer +Sender: ITeX-Mgr@SHSU.edu +To: info-tex@shsu.edu +Reply-to: Michael Downes <MJD@MATH.AMS.ORG> +Message-id: <742063535.36965.MJD@math.ams.org> +X-ListName: TeX-Related Network Discussion List <INFO-TeX@SHSU.edu> + +"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. + <to be read again> + \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 <box> object in the sense of the +TeXbook, chapter 24, p 278. There are only a few TeX commands that +accept a <box> object as their argument (\shipout, \setbox, \leaders, +...), and \unvbox is not one of them. |