Failure on AMD64 Windows8.1 Non-Debug 3.x:

http://buildbot.python.org/all/#/builders/12/builds/585

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ERROR: test_all_project_files (lib2to3.tests.test_parser.TestParserIdempotency)
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Traceback (most recent call last):
  File "D:\buildarea\3.x.ware-win81-release\build\lib\lib2to3\tests\test_parser.py", line 432, in test_all_project_files
    x = diff(filepath, new, encoding=encoding)
  File "D:\buildarea\3.x.ware-win81-release\build\lib\lib2to3\tests\test_parser.py", line 488, in diff
    return subprocess.call(['diff', '-u', fn, '@'], stdout=(subprocess.DEVNULL if verbose < 1 else None))
  File "D:\buildarea\3.x.ware-win81-release\build\lib\subprocess.py", line 304, in call
    with Popen(*popenargs, **kwargs) as p:
  File "D:\buildarea\3.x.ware-win81-release\build\lib\subprocess.py", line 756, in __init__
    restore_signals, start_new_session)
  File "D:\buildarea\3.x.ware-win81-release\build\lib\subprocess.py", line 1160, in _execute_child
    startupinfo)
FileNotFoundError: [WinError 2] The system cannot find the file specified