old_contents: __all__ = ['__version__']
  
  try:
      from ._version import __version__
  except ImportError:
      # broken installation, we don't even try
      # unknown only works because we do poor mans version compare
      __version__ = 'unknown'
  
new_contents: __all__ = ['__version__']
  
  try:
      from ._version import version as __version__
  except ImportError:
      # broken installation, we don't even try
      # unknown only works because we do poor mans version compare
      __version__ = 'unknown'
  
subject: fix import error