pylint #4685 Problem with Pylint's handling on __all__ [validation pending]

"""Test Pylint's use of __all__.

* NonExistant is not defined in this module, and it is listed in
  __all__. An error is expected.

* This module imports path and republished it in __all__. No errors
  are expected.
from os import path

__all__ = [

class Dummy:
  """A class defined in this module."""
done in0.26.0
load left0.000
closed by#4d59dfcc0acc Add test and code for handling __all__ with pylint. Closes #4685.