[XeTeX] Getting vinculum in fractions with Asana Math and unicode-math when compiled with xelatex

[Philip Taylor (Webmaster, Ret'd)]

As a point of interest, Chandra, what do you get for :

\documentclass[a4paper,12pt]{article}
\usepackage{fontspec}
\usepackage{unicode-math}
\setmathfont{Asana Math}
\begin{document}
${2\pi r \over r} = 2\pi$
\end{document}

Philip Taylor