def cas(self, key, val, time=0, min_compress_len=0):
        return self._set("cas", key, val, time, min_compress_len)
Return a line number of the given object's docstring.  Note:
dataset/ETHPy150Open mozilla/source/vendor-local/lib/python/memcache.py/Client.cas--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.2/django/test/_doctest.py/DocTestFinder._find_lineno