🚀 go-pugleaf

In the tabbing mode, the `~` character produces one space. 
How can one include the tilde character when needed in verbatim?

I tried the following:

\def\verbtilde{$\sim$}

\begin{tabbing}
This is an example\\
x\verbtilde x\\
\end{tabbing}

This is hardly elegant. In fact, the width of the tilde doesn't match
the width of the other characters and messes up the whole alignment.

Any suggestions?

-- Nicolas.
--
----------Nicolas Rouquette----------rouquett@aig.jpl.nasa.gov
    Artificial Intelligence Group
      Jet Propulsion Laboratory