%%
%% The LaTeX Companion, 3ed
%%
%% Example 4-2-39 on page I-320 in "Inline verbatim material in dangerous places".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See https://www.latex-project.org/lppl.txt for details.
%%

\documentclass{tlc3exa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{111.0pt}

  \usepackage{microtype}  % improve h&j in example

%StartShownPreambleCommands
\usepackage{fancyvrb}
\newcommand\vitem[1][]{\SaveVerb[commandchars=\|\<\>,%
   aftersave={\item[\textnormal{\UseVerb[#1]{vsave}}]}]{vsave}}
%StopShownPreambleCommands

\begin{document}
\begin{description}
\vitem+\ddanger+   Dangerous beast found in \TeX books.
\vitem[fontsize=\tiny]+\danger+ Its small brother,
                                still dangerous.
\vitem+\dddanger{|emph<arg>}+   The ultimate horror.
\end{description}
\end{document}