I'm seeing some strange behavior with coverage tracing in bzrlib.tests.make_bzrdir and bzrlib.transport.get_transport. The tracer stops tracing when the latter returns control to the former. When I run bzr --coverage cover selftest -v test_push_onto_just_bzrdir , the coverage results look wrong. The results file cover/bzrlib.tests.__init__.cover indicates that the first several lines of make_bzrdir were covered, but the lines after get_transport were not. Do others' coverage results have the same problem? Matt