old_contents: """
  Ensure that the local copy of distutils is preferred over stdlib.
  
  See https://github.com/pypa/setuptools/issues/417#issuecomment-392298401
  for more motivation.
  """
  
  import sys
  import re
  import os
  import importlib
  import warnings
  
  
  is_pypy = '__pypy__' in sys.builtin_module_names
  
  
  def warn_distutils_present():
      if 'distutils' not in sys.modules:
          return
      if is_pypy and sys.version_info < (3, 7):
          # PyPy for 3.6 unconditionally imports distutils, so bypass the warning
          # https://foss.heptapod.net/pypy/pypy/-/blob/be829135bc0d758997b3566062999ee8b23872b4/lib-python/3/site.py#L250
          return
      warnings.warn(
          "Distutils was imported before Setuptools. This usage is discouraged "
          "and may exhibit undesirable behaviors or errors. Please use "
          "Setuptools' objects directly or at least import Setuptools first.")
  
  
  def clear_distutils():
      if 'distutils' not in sys.modules:
          return
      warnings.warn("Setuptools is replacing distutils.")
      mods = [name for name in sys.modules if re.match(r'distutils\b', name)]
      for name in mods:
          del sys.modules[name]
  
  
  def enabled():
      """
      Allow selection of distutils by environment variable.
      """
      which = os.environ.get('SETUPTOOLS_USE_DISTUTILS', 'stdlib')
      return which == 'local'
  
  
  def ensure_local_distutils():
      clear_distutils()
      distutils = importlib.import_module('setuptools._distutils')
      distutils.__name__ = 'distutils'
      sys.modules['distutils'] = distutils
  
      # sanity check that submodules load as expected
      core = importlib.import_module('distutils.core')
      assert '_distutils' in core.__file__, core.__file__
  
  
  warn_distutils_present()
  if enabled():
      ensure_local_distutils()
  
new_contents: """
  Ensure that the local copy of distutils is preferred over stdlib.
  
  See https://github.com/pypa/setuptools/issues/417#issuecomment-392298401
  for more motivation.
  """
  
  import sys
  import re
  import os
  import importlib
  import warnings
  
  
  def clear_distutils():
      if 'distutils' not in sys.modules:
          return
  
      mods = [name for name in sys.modules if re.match(r'distutils\b', name)]
      for name in mods:
          del sys.modules[name]
  
  
  def enabled():
      """
      Allow selection of distutils by environment variable.
      """
      which = os.environ.get('SETUPTOOLS_USE_DISTUTILS', 'stdlib')
      return which == 'local'
  
  
  def ensure_local_distutils():
      clear_distutils()
      distutils = importlib.import_module('setuptools._distutils')
      distutils.__name__ = 'distutils'
      sys.modules['distutils'] = distutils
  
      # sanity check that submodules load as expected
      core = importlib.import_module('distutils.core')
      assert '_distutils' in core.__file__, core.__file__
  
  
  if enabled():
      ensure_local_distutils()
  
subject: Remove warnings