def back(self):
        if not len(self.backout):
            raise TemplateSyntaxError, "back called without some previous parsing"
        self.pointer = self.backout.pop()
Undoes the last microparser. Use this for lookahead and backtracking.
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-0.96/django/template/__init__.py/TokenParser.back