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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 23.4.3, p. III-256.
+% Original source in file "macros3.TEX", starting line 1021.
+\wlog{L: "futlet.tip" ["macros3.TEX," l. 1021, p. III-256]}%
+% This file DOES belong to format "texip."
+\catcode`\@ = 11
+\long\def\DoLongFutureLet #1#2#3#4{%
+ \def\@FutureLetDecide{%
+ #1#2\@FutureLetToken
+ \def\@FutureLetNext{#3}%
+ \else
+ \def\@FutureLetNext{#4}%
+ \fi
+ \@FutureLetNext
+ }%
+ \futurelet\@FutureLetToken\@FutureLetDecide
+}
+\def\DoFutureLet #1#2#3#4{\DoLongFutureLet{#1}{#2}{#3}{#4}}
+\catcode`\@ = 12