for old_all_stanza in old_rule.get('all', []):
            if len(old_all_stanza) != 2:
                raise Exception('Confusing all-rule stanza ' + str(count) + ': ' + json.dumps(old_all_stanza))

            all_stanzas.append({ 'type': old_all_stanza[0], 'value': old_all_stanza[1] })