%%
%% The LaTeX Companion, 3ed
%%
%% Example 3-4-39 on page I-199 in "url --- Typesetting \acsp {url}, path names, and the like".
%%
%% 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{183.0pt}

%StartShownPreambleCommands
\usepackage{url}
\urldef\test\path{^^frank~#$\}
%StopShownPreambleCommands

\begin{document}
\section{\test{} works?}
It does---in contrast to the earlier example.
\end{document}