def process_tokens(self, tokens):
        self._tokens = list(tokens)
        self._pos = 0
        self._ast = self._assert(self._chunk(), 'input to be a program')
Add a 'initial' prefix for checking dynamic initial values
dataset/ETHPy150Open dansanderson/picotool/pico8/lua/parser.py/Parser.process_tokens--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.2/django/forms/forms.py/BaseForm.add_initial_prefix