I just upgraded Stack to v1.0.2 on Mac OS X.  I naively ran 'stack test --trace' hoping to get better messages out of any errorWithStackTrace calls in my tests.  

After a long, successful build, the tests failed with the message 'Could not understand these extra arguments:  +RTS   -xc'. 

Am I doing something obviously wrong?  Or is this a Stack bug?

--Eric