def append(self, value):
    self.__field.validate_element(value)
    return list.append(self, value)
Regression for #10349: A callable can be provided as the initial value for an m2m field
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/protorpc/protorpc/messages.py/FieldList.append--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.2/tests/regressiontests/model_forms_regress/tests.py/ManyToManyCallableInitialTests.test_callable