old_contents: #!/usr/bin/env python3
  
  # Copyright 2016 The Meson development team
  
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  
  #     http://www.apache.org/licenses/LICENSE-2.0
  
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  import sys
  
  if sys.version_info < (3, 6):
      raise SystemExit('ERROR: Tried to install Meson with an unsupported Python version: \n{}'
                       '\nMeson requires Python 3.6.0 or greater'.format(sys.version))
  
  from mesonbuild.coredata import version
  from setuptools import setup, find_packages
  
  # On windows, will create Scripts/meson.exe and Scripts/meson-script.py
  # Other platforms will create bin/meson
  entries = {'console_scripts': ['meson=mesonbuild.mesonmain:main']}
  data_files = []
  if sys.platform != 'win32':
      # Only useful on UNIX-like systems
      data_files = [('share/man/man1', ['man/meson.1']),
                    ('share/polkit-1/actions', ['data/com.mesonbuild.install.policy'])]
  
  if __name__ == '__main__':
      setup(name='meson',
            version=version,
            packages=find_packages(
                include=['mesonbuild', 'mesonbuild.*'],
                exclude=['*.data']
            ),
            entry_points=entries,
            data_files=data_files,)
  
new_contents: #!/usr/bin/env python3
  
  # Copyright 2016 The Meson development team
  
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  
  #     http://www.apache.org/licenses/LICENSE-2.0
  
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  import sys
  
  if sys.version_info < (3, 6):
      raise SystemExit('ERROR: Tried to install Meson with an unsupported Python version: \n{}'
                       '\nMeson requires Python 3.6.0 or greater'.format(sys.version))
  
  from mesonbuild.coredata import version
  from setuptools import setup, find_packages
  
  # On windows, will create Scripts/meson.exe and Scripts/meson-script.py
  # Other platforms will create bin/meson
  entries = {'console_scripts': ['meson=mesonbuild.mesonmain:main']}
  data_files = []
  if sys.platform != 'win32':
      # Only useful on UNIX-like systems
      data_files = [('share/man/man1', ['man/meson.1']),
                    ('share/polkit-1/actions', ['data/com.mesonbuild.install.policy'])]
  
  setup(name='meson',
        version=version,
        packages=find_packages(
            include=['mesonbuild', 'mesonbuild.*'],
            exclude=['*.data']
        ),
        entry_points=entries,
        data_files=data_files,)
  
subject: remove pointless __main__ guard