Update self cache from other.

def update(self, cache):
        """ Update self cache from other.
        """
        self.cache['delims'] = cache.get('delims')
        self.cache['opts'].update(cache.get('opts'))
        self.cache['rset'].update(cache.get('rset'))
        self.cache['mix'].update(cache.get('mix'))
        map(self.set_var, cache['ctx'].values())