new_contents: # This is here simply to aid migration to trefoil.  It will be removed in a future version!
  
  import sys
  import warnings
  
  import trefoil
  
  warnings.simplefilter('always', DeprecationWarning)
  warnings.warn(
      "the package name 'clover' has been deprecated; use 'trefoil' instead",
      DeprecationWarning)
  
  sys.modules['clover'] = trefoil
subject: Add shim for clover package name and deprecation warning