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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 23.4.5.1, p. III-260.
-% Original source in file "macros3.TEX", starting line 1219.
-\wlog{L: "optargx.tip" ["macros3.TEX," l. 1219, p. III-260]}%
-% This file DOES belong to format "texip."
-\InputD{futlet.tip}
-\catcode`\@ = 11
-\def\OptArgX #1#2{%
- \let\@OptArgXTemp = #1%
- \def\@OptArgXDefault{[#2]}%
- \DoLongFutureLet{\ifx}{[}{\@OptArgXTemp}{\@OptArgXB}%
-}
-\def\@OptArgXB{\expandafter\@OptArgXTemp\@OptArgXDefault}
-\catcode`\@ = 12