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+% +--------------------------------------------------+
+% | Documentation in clear text follows |
+% +--------------------------------------------------+
+%
+% (c) 2002 Javier Bezos. All Rights Reserved.
+%
+% This file can be redistributed and/or modified under the terms
+% of the LaTeX Project Public License Distributed from CTAN
+% archives in directory macros/latex/base/lppl.txt; either
+% version 1 of the License, or any later version.
+%
+% Please, send your comments and suggestions to <jbezos@wanadoo.es>.
+%
+% Usage
+% ~~~~~
+% When an environment is left open, LaTeX gives an error at the
+% end of the document. However it only informs about the first
+% of them, while the rest are shown with meaningless errors:
+%
+% (\end occurred inside a group at level N)
+%
+% This package replaces them with more useful messages
+% which show which environments (in reverse order) were
+% not closed.
+%
+% That's all. There are no user macros. Just use the package.
+%
+% Code
+% ~~~~
+
+\def\fileversion{1.0}
+\def\filedate{2002/04/20}
+
+\ProvidesPackage{checkend}[2002/04/20 v1.0 Environment checking]
+
+\def\chkend@checkend{%
+ \def\@tempa{document}%
+ \ifx\@currenvir\@tempa
+ \else
+ \count@\errorcontextlines
+ \errorcontextlines\z@
+ \PackageError{checkend}{%
+ \@currenvir \@currenvline \space open at
+ \string\end{document}}%
+ {The package has detected an open environment at the
+ end\MessageBreak
+ of the document}%
+ \errorcontextlines\count@
+ \csname end\@currenvir\endcsname
+ \endgroup
+ \chkend@checkend
+ \fi}
+
+\AtEndDocument{\chkend@checkend}
+
+\endinput \ No newline at end of file