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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 19.3.10, p. III-96.
+% Original source in file "tokens2.TEX", starting line 1462.
+\wlog{L: "cref-5.tip" ["tokens2.TEX," l. 1462, p. III-96]}%
+% This file DOES NOT belong to format "texip."
+\InputD{gobble.tip}
+\InputD{input-at.tip}
+\catcode`\@ = 11
+\newif\if@LabelOk
+\def\CheckLabels{%
+ \@LabelOktrue
+ \def\@NewLabel ##1##2##3{%
+ \def\@CrefTemp{{##2}{##3}}%
+ \if\NameDefinedConditional{@REF-##1}%
+ \edef\@@CrefTemp{\NameUse{@REF-##1}}%
+ \ifx\@CrefTemp\@@CrefTemp
+ \let\@CrefNext = \relax
+ \else
+ \let\@CrefNext = \@StopCheckingLabels
+ \fi
+ \else
+ \let\@CrefNext = \@StopCheckingLabels
+ \fi
+ \@CrefNext
+ }%
+ \InputAt{\jobname.lab}%
+ \if@LabelOk
+ \wlog{\string\CheckLabels: labels are ok.}%
+ \else
+ \wlog{\string\CheckLabels: labels CHANGED between
+ preceding and this run.}%
+ \wlog{Reprocess document.}%
+ \fi
+}
+\def\@StopCheckingLabels{%
+ \@LabelOkfalse
+ \let\@NewLabel = \GobbleThree
+}
+\catcode`\@ = 12