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+%%
+%% The LaTeX Companion, 2ed (second printing August 2004)
+%%
+%% Example 3-3-28 on page 150.
+%%
+%% Copyright (C) 2004 Frank Mittelbach, Michel Goossens,
+%%    Johannes Braams, David Carlisle, and Chris Rowley
+%%
+%% It may be distributed and/or modified under the conditions
+%% of the LaTeX Project Public License, either version 1.3
+%% of this license or (at your option) any later version.
+%%
+%% See http://www.latex-project.org/lppl.txt for details.
+%%
+
+\documentclass{ttctexa}
+\pagestyle{empty}
+\setcounter{page}{6}
+\setlength\textwidth{159.0pt}
+\sloppy % as the column in the book is so small
+\newenvironment{Description}
+   {\begin{list}{}{\let\makelabel\Descriptionlabel
+      \setlength\labelwidth{40pt}%
+      \setlength\leftmargin{\labelwidth+\labelsep}}}%
+   {\end{list}}
+
+\StartShownPreambleCommands
+\usepackage{calc,ifthen}   \newlength{\Mylen}
+% definition of Description environment as before
+\newcommand*\Descriptionlabel[1]{%
+  \settowidth\Mylen{\textsf{#1:}}%   determine width
+  \ifthenelse{\lengthtest{\Mylen > \labelwidth}}%
+      {\parbox[b]{\labelwidth}%     term  > labelwidth
+         {\makebox[0pt][l]{\textsf{#1:}}\\\mbox{}}}%
+      {\textsf{#1:}}%               term <= labelwidth
+  \hfill}
+\StopShownPreambleCommands
+\begin{document}
+\begin{Description}
+\item[Description]  Returns from a function.
+ If issued at top level, the interpreter simply
+ terminates, just as if end of input had been reached.
+\item[Errors]   None.
+\item[Return values]
+ Any arguments in effect are passed back to the caller.
+\end{Description}
+\end{document}