@abc.abstractproperty
    def created_on(self):
If L{deprecatedModuleAttribute} is used to deprecate a module attribute
dataset/ETHPy150Open openstack/taskflow/taskflow/jobs/base.py/Job.created_on--crossover with--dataset/ETHPy150Open nlloyd/SubliminalCollaborator/libs/twisted/python/test/test_deprecate.py/ImportedModuleAttributeTests.test_deprecatedModuleMultipleTimes