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+% This macro source file is from the four volume series
+% "TeX in Practice" by Stephan von Bechtolsheim, published
+% 1993 by Springer-Verlag, New York.
+% Copyright 1993 Stephan von Bechtolsheim.
+% No warranty or liability is assumed.
+% This macro may be copied freely if no fees other than
+% media cost or shipping charges are charged and as long
+% as this copyright and the following source code itself
+% is not changed. Please see the series for further information.
+%
+% Version: 1.0
+% Date: May 1, 1993
+%
+%
+% This source code is documented in 28.5.7, p. III-481.
+% Original source in file "io1.TEX", starting line 1716.
+\wlog{L: "robust.tip" ["io1.TEX," l. 1716, p. III-481]}%
+% This file DOES belong to format "texip."
+\InputD{fotok.tip}
+\catcode`\@ = 11
+\def\MakeRobust{}
+\def\TreatAsRobust #1{%
+ \def #1{%
+ \noexpand #1%
+ }%
+}
+\newtoks\@RobustTokenList
+\@RobustTokenList = {}
+\def\AddToRobustList #1{%
+ \@RobustTokenList = \expandafter{\the\@RobustTokenList #1}%
+}
+\def\Robusting{%
+ \ForEachToken{\@RobustTokenList}{\TreatAsRobust}%
+}
+\catcode`\@ = 12