-v is incompatible with -g and does not compare test output files.
-s means to run only a single test and exit. This is useful when doing memory
-analysis on the Python interpreter (which tend to consume to many resources to
+analysis on the Python interpreter (which tend to consume too many resources to
run the full regression test non-stop). The file /tmp/pynexttest is read to
find the next test to run. If this file is missing, the first test_*.py file
in testdir or on the command line is used. (actually tempfile.gettempdir() is