def test_prop_shadow(self):

        Address, addresses, users, User = (self.classes.Address,
                                           self.tables.addresses,
                                           self.tables.users,
                                           self.classes.User)

        mapper(Address, addresses)
        mapper(User, users,
               properties={
                   'addresses': relationship(Address, backref='email_address')
               })
        assert_raises(sa.exc.ArgumentError, sa.orm.configure_mappers)
Remove the `instance` from this ``Session``.
dataset/ETHPy150Open zzzeek/sqlalchemy/test/orm/test_mapper.py/MapperTest.test_prop_shadow--crossover with--dataset/ETHPy150Open goFrendiAsgard/kokoropy/kokoropy/packages/sqlalchemy/orm/session.py/Session.expunge