%%
%% The LaTeX Companion, 3ed
%%
%% Example 4-2-1 on page I-297 in "Displaying spaces in verbatim material".
%%
%% 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{159.0pt}

  % run with lualatex

  \setlength\parindent{0pt}

%StartShownPreambleCommands
\usepackage{fontspec} \setmonofont{AnonymousPro}
%StopShownPreambleCommands

\begin{document}
\texttt{Typewriter  with\textvisiblespace space}.\par
\verb=\verb*=: \verb*=verbatim with  spaces=.    \par
\DeclareRobustCommand\verbvisiblespace
  {\textvisiblespace} % now use the Unicode character
But now: \verb*=verbatim with  spaces=.
\end{document}