def p_identifier_list_opt(self, p):
        '''identifier_list_opt : identifier_list
                               | 
        '''
        if len(p) == 2:
            p[0] = p[1]
        else:
            p[0] = ()
dataset/ETHPy150Open ardekantur/pyglet/tools/wraptypes/preprocessor.py/PreprocessorGrammar.p_identifier_list_opt/original