How can I use LaTeX-commands inside of a listing?

I'm using the listings package in a LaTeX document. It works great, but it doesn't allow me to put LaTeX commands inside of the listing. I would like to use a counter to enumerate some of the interesting parts in the source code.

Is there a way to enable LaTeX commands in source listings?

OK, found the answer. You can use escapechar=<char> to set a character that will escape you to the latex mode. See The Listings Package, 4.3.13 Escaping to LaTeX.
• Here is an example: if you set escapechar=\%, you could use it inside the listings as follows: \begin{lstlisting} t %\leftarrow% 0 \end{lstlisting}. – thiagowfx Jul 9 '17 at 23:28