test test_codeccallbacks failed -- Traceback (most recent call last):
  File "/home/maker/dev/cpython/Lib/test/test_codeccallbacks.py", line 643, in test_lookup_aliases
    module = importlib.import_module('encodings.' + module_name)
  File "/home/maker/dev/cpython/Lib/importlib/__init__.py", line 124, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "/home/maker/dev/cpython/Lib/importlib/_bootstrap.py", line 820, in _gcd_import
    loader.load_module(name)
  File "/home/maker/dev/cpython/Lib/importlib/_bootstrap.py", line 437, in load_module
    return self._load_module(fullname)
  File "/home/maker/dev/cpython/Lib/importlib/_bootstrap.py", line 141, in decorated
    return fxn(self, module, *args, **kwargs)
  File "/home/maker/dev/cpython/Lib/importlib/_bootstrap.py", line 342, in _load_module
    exec(code_object, module.__dict__)
  File "/home/maker/dev/cpython/Lib/encodings/mbcs.py", line 12, in <module>
    from codecs import mbcs_encode, mbcs_decode
ImportError: cannot import name mbcs_encode

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