Clean up the ast analyzer a little
Clean up the ast analyzer a little

blueyed/coveragepy,nedbat/coveragepy,blueyed/coveragepy,nedbat/coveragepy,hugovk/coveragepy,nedbat/coveragepy,hugovk/coveragepy,blueyed/coveragepy,blueyed/coveragepy,hugovk/coveragepy,hugovk/coveragepy,nedbat/coveragepy,blueyed/coveragepy,nedbat/coveragepy,hugovk/coveragepy