old_contents: # Licensed under a 3-clause BSD style license - see LICENSE.rst
  from __future__ import (absolute_import, division, print_function,
                          unicode_literals)
  
  from astropy.utils.exceptions import AstropyWarning
  
  __all__ = ["TargetAlwaysUpWarning", "TargetNeverUpWarning",
             "OldEarthOrientationDataWarning", "PlotWarning",
             "PlotBelowHorizonWarning"]
  
  class TargetAlwaysUpWarning(AstropyWarning):
      """Target is circumpolar"""
      pass
  
  class TargetNeverUpWarning(AstropyWarning):
      """Target never rises above horizon"""
      pass
  
  class OldEarthOrientationDataWarning(AstropyWarning):
      """Using old Earth rotation data from IERS"""
      pass
  
  class PlotWarning(AstropyWarning):
      """Warnings dealing with the plotting aspects of astroplan"""
      pass
  
  class PlotBelowHorizonWarning(PlotWarning):
      """Warning for when something is hidden on a plot because it's below the horizon"""
      pass
  
new_contents: # Licensed under a 3-clause BSD style license - see LICENSE.rst
  from __future__ import (absolute_import, division, print_function,
                          unicode_literals)
  
  from astropy.utils.exceptions import AstropyWarning
  
  __all__ = ["TargetAlwaysUpWarning", "TargetNeverUpWarning",
             "OldEarthOrientationDataWarning", "PlotWarning",
             "PlotBelowHorizonWarning"]
  
  class AstroplanWarning(AstropyWarning):
      """Superclass for warnings used by astroplan"""
  
  class TargetAlwaysUpWarning(AstroplanWarning):
      """Target is circumpolar"""
      pass
  
  class TargetNeverUpWarning(AstroplanWarning):
      """Target never rises above horizon"""
      pass
  
  class OldEarthOrientationDataWarning(AstroplanWarning):
      """Using old Earth rotation data from IERS"""
      pass
  
  class PlotWarning(AstroplanWarning):
      """Warnings dealing with the plotting aspects of astroplan"""
      pass
  
  class PlotBelowHorizonWarning(PlotWarning):
      """Warning for when something is hidden on a plot because it's below the horizon"""
      pass
  
subject: Make all astroplan warnings decend from an AstroplanWarning