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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}
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