Test that SystemExits are handled properly by the exit machinery.  I broke the "raise SystemExit(46)" case when doing new-style exceptions, but I'd much rather have found out here than in test_tempfile (growl).
Test that SystemExits are handled properly by the exit machinery.  I
broke the "raise SystemExit(46)" case when doing new-style exceptions,
but I'd much rather have found out here than in test_tempfile (growl).

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator