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+ % Making those `Label(s) have changed\dots' messages more explicit
+%
+% The \LaTeX{} kernel produces the messages when something, while the
+% |.aux| file is being scanned (after the \cs{AtEndDocument} tokens
+% have been executed), sets the \cs{if@tempswa} switch with the
+% command \cs{@tempswatrue}.
+%
+% (This fact can be used by packages, such as my |footmisc.sty|, to
+% piggy-back on the message; but it's nice in that circumstance and
+% others to be sure where the message is coming from.)
+%
+% This is a jiffy patch to the kernel so that it produces a
+% (\cs{typeout}) message for each label \emph{it} thinks has changed.
+%
+% Usage: Incorporate this code into a package or class file,       or
+%        \input this file from a package or class file,            or
+%        \makeatletter \input{checklab} \makeatother in your document
+%                                                    preamble
+%
+% This software jiffy is placed in the public domain.  Do with it as
+% you wish, though I have to say I would prefer you not to claim it
+% as your own (otoh, it's the product of a twisted mind, so probably
+% not an attractive thing to claim).
+%
+% Robin Fairbairns (rf10@cl.cam.ac.uk)
+% Produced in this form 1999/01/15
+%
+\def\@testdef #1#2#3{%
+  \def\reserved@a{#3}%
+  \expandafter \ifx \csname #1@#2\endcsname \reserved@a
+  \else
+    \@tempswatrue
+    \typeout{label change: #1@#2 was
+      \expandafter \ifx \csname #1@#2\endcsname \relax
+        unset
+      \else
+        \csname#1@#2\endcsname\space
+      \fi
+      now #3}%
+  \fi
+}