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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 21.5.7, p. III-175.
+% Original source in file "macros1.TEX", starting line 1292.
+\wlog{L: "newdef.tip" ["macros1.TEX," l. 1292, p. III-175]}%
+% This file DOES belong to format "texip."
+\catcode`\@ = 11
+\def\NewDef #1{%
+ \ifx #1\@UndefinedToken
+ \else
+ \errhelp = {\string\NewDef:
+ The name of the macro to be defined which you
+ provided is already in use. Use \show to find out
+ what the name is used for. The macro definition
+ will nevertheless be executed.}%
+ \errmessage{\string\NewDef: "\string#1" already defined.}%
+ \fi
+ \def #1%
+}
+\def\ReDef #1{%
+ \ifx #1\@UndefinedToken
+ \errhelp = {\string\ReDef:
+ The name of the macro to be redefined which you
+ provided has never been used before. The macro definition
+ will nevertheless be executed. }%
+ \errmessage{\string\ReDef: "\string#1" never defined
+ before.}%
+ \fi
+ \def #1%
+}
+\catcode`\@ = 12