old_contents: # July 2002, Graham Fawcett
  #
  # this hack was inspired by the way Thomas Heller got py2exe
  # to appear as a distutil command
  #
  # we replace distutils.command.build_ext with our own version
  # and keep the old one under the module name _build_ext,
  # so that *our* build_ext can make use of it.
  
  from Cython.Distutils.build_ext import build_ext
  
  # from extension import Extension
  
new_contents: from Cython.Distutils.build_ext import build_ext
  from Cython.Distutils.extension import Extension
  
subject: remove outdated comments