# Problem with listings package using stix fonts

Consider the following code:

\documentclass{article}
\usepackage{stix}
\usepackage{listings,xcolor}
\lstdefinelanguage{test}{sensitive=true,
morekeywords={TEST},
morecomment=[l]{--}}
\lstnewenvironment{testcode}
{\lstset{breaklines=true,language=test, basicstyle=\color{blue}\tiny}}
{}
\begin{document}
\begin{testcode}
TEST

-- Testing 8*8=64
\end{testcode}
\end{document}


compiling with pdflatex gives the following output:

As seen, the asterix * does not show up in the listings comment..

If I don't use the stix package, it works fine:

If you look in the log file, you see the origin of the problem:

Missing character: There is no * in font ts1-stixgeneral-italic!


This happens as soon as you try to output an italic * with listings. That's because listings tries to substitute * with \textasteriskcentered which unfortunately doesn't exist in the right variant when using the current stix fonts release (STIXv1.1.0-latex). A simple workaround is to redefine \textasteriskcentered to be a mathematical *:

\documentclass{article}
\usepackage{stix}
\renewcommand{\textasteriskcentered}{\ensuremath{*}}
\usepackage{listings}
\lstset{basicstyle=\itshape}
\begin{document}
\begin{lstlisting}
Testing 8*8=64
\end{lstlisting}
\end{document}