def Advance(self):
    self.index += 1
Create the warning string used by deprecated attributes.
dataset/ETHPy150Open google/rfmt/formatter/support.py/Solution.Advance--crossover with--dataset/ETHPy150Open nlloyd/SubliminalCollaborator/libs/twisted/python/test/test_deprecate.py/DeprecatedAttributeTests._getWarningString