[XeTeX] Weird character swap when using xelatex+fontspec+listings

[Eelis van der Weegen]

When I compile the attached t.tex with xelatex I get the attached t.pdf,
in which the big pi has somehow switched positions with 'a'. What's
going on here? :)

I'm using XeTeX 3.1415926-2.2-0.9995.2 as part of TeX Live 2009.
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