Experimental parser: cleanup rule processing result

tools/lexer_generator/action_test.py

 # Copyright 2013 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 33 matching lines @@
       self.assertEqual(actions[-1], Action('TERMINATE'))
       self.assertEqual(actions[-2].data(), expected_code)
 
     def test_action_precedence(self):
       rules = '''<default>
                  "key" { KEYWORD } <<break>>
                  /[a-z]+/ { ID } <<break>>'''
       automata_for_conditions = process_rules(rules)
       self.assertEqual(len(automata_for_conditions), 1)
       self.assertTrue('default' in automata_for_conditions)
-      (nfa, dfa) = automata_for_conditions['default']
+      dfa = automata_for_conditions['default'].dfa()
 
       self.__verify_last_action(dfa, 'foo', 'ID')
       self.__verify_last_action(dfa, 'key', 'KEYWORD')
       self.__verify_last_action(dfa, 'k', 'ID')
       self.__verify_last_action(dfa, 'ke', 'ID')
       self.__verify_last_action(dfa, 'keys', 'ID')
 
     def test_wrong_action_precedence(self):
       rules = '''<default>
                  /[a-z]+/ { ID } <<break>>
                  "key" { KEYWORD } <<break>>'''
       automata_for_conditions = process_rules(rules)
       self.assertEqual(len(automata_for_conditions), 1)
       self.assertTrue('default' in automata_for_conditions)
-      (nfa, dfa) = automata_for_conditions['default']
+      dfa = automata_for_conditions['default'].dfa()
 
       # The keyword is not recognized because of the rule preference order (ID
       # is preferred over KEYWORD).
       self.__verify_last_action(dfa, 'foo', 'ID')
       self.__verify_last_action(dfa, 'key', 'ID')