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-rw-r--r--info/examples/Einfuehrung/mpxerr.tex14
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diff --git a/info/examples/Einfuehrung/mpxerr.tex b/info/examples/Einfuehrung/mpxerr.tex
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index 0000000000..7c278b6631
--- /dev/null
+++ b/info/examples/Einfuehrung/mpxerr.tex
@@ -0,0 +1,14 @@
+\gdef\mpxshipout{\shipout\hbox\bgroup%
+ \setbox0=\hbox\bgroup}%
+\gdef\stopmpxshipout{\egroup \dimen0=\ht0 \advance\dimen0\dp0
+ \dimen1=\ht0 \dimen2=\dp0
+ \setbox0=\hbox\bgroup
+ \box0
+ \ifnum\dimen0>0 \vrule width1sp height\dimen1 depth\dimen2
+ \else \vrule width1sp height1sp depth0sp\relax
+ \fi\egroup
+ \ht0=0pt \dp0=0pt \box0 \egroup}
+\mpxshipout% line 1 ./mptextmp.mp
+Kurve 1%
+\stopmpxshipout
+\end{document}