def p_pp_tokens_opt(self, p):
        if len(p) == 2:
            p[0] = p[1]
        else:
            p[0] = ()
pp_tokens_opt : pp_tokens
dataset/ETHPy150Open ardekantur/pyglet/tools/wraptypes/preprocessor.py/PreprocessorGrammar.p_pp_tokens_opt