Try to deal with this warning/error: DeprecationWarning: generator 'iter_roles' raised StopIteration PEP479 specifies how to rework it by using return rather than raise StopIteration. I am not sure if this is right, but test/test_cgi.py::FormTestCase::testRoles is still passing.

{
    "validthis": true,
    "laxcomma" : true,
    "laxbreak" : true,
    "browser"  : true,
    "eqnull"   : true,
    "debug"    : true,
    "devel"    : true,
    "boss"     : true,
    "expr"     : true,
    "asi"      : true
}