Tracked it down. astbuilder can't handle the (new in python 2.7) multiple context managers with one statement described here [http://docs.python.org/dev/whatsnew/2.7.html#other-language-changes]
So it wont be a major problem until 2.7.
I'm marking this defect as "Invalid" to reflect that.
Maybe testing pythoscope against unreleased python code wasn't the best idea :)