Not sure where do I report this. If you get a Flash Player error when trying to run the compiler tests make sure to add full path to directory falcon/compiler.tests to your Flash Player trust file (for location see http://livedocs.adobe.com/flex/3/html/help.html?content=security2_25.html)
Without trusting the directory the mxml.tags.MXMLArrayTagTests in feature.tests opens Flash Player and then fails with popup error message since it is not trusted to execute the exit() call. Adding directory falcon/compiler.tests to Flash Player Trust files fixes the problem.