old_contents: #!/usr/bin/env python3
  
  from pathlib import Path
  import argparse
  import os
  import subprocess
  import sys
  import typing as T
  
  modules = [
      # fully typed submodules
      'mesonbuild/ast',
      'mesonbuild/cmake',
      'mesonbuild/compilers',
      'mesonbuild/dependencies',
      'mesonbuild/interpreterbase',
      'mesonbuild/scripts',
      'mesonbuild/wrap',
  
      # specific files
      'mesonbuild/arglist.py',
      # 'mesonbuild/coredata.py',
      'mesonbuild/envconfig.py',
      'mesonbuild/linkers.py',
      'mesonbuild/mcompile.py',
      'mesonbuild/mdevenv.py',
      'mesonbuild/mesonlib/platform.py',
      'mesonbuild/mesonlib/universal.py',
      'mesonbuild/minit.py',
      'mesonbuild/minstall.py',
      'mesonbuild/mintro.py',
      'mesonbuild/mlog.py',
      'mesonbuild/modules/fs.py',
      'mesonbuild/modules/unstable_rust.py',
      'mesonbuild/mparser.py',
      'mesonbuild/msetup.py',
      'mesonbuild/mtest.py',
      'mesonbuild/optinterpreter.py',
      'mesonbuild/programs.py',
  
      'run_mypy.py',
      'run_project_tests.py',
      'run_single_test.py',
      'tools'
  ]
  
  if os.name == 'posix':
      modules.append('mesonbuild/mesonlib/posix.py')
  elif os.name == 'nt':
      modules.append('mesonbuild/mesonlib/win32.py')
  
  def check_mypy() -> None:
      try:
          import mypy
      except ImportError:
          print('Failed import mypy')
          sys.exit(1)
  
  def main() -> int:
      check_mypy()
  
      root = Path(__file__).absolute().parent
      args = []  # type: T.List[str]
  
      parser = argparse.ArgumentParser(description='Process some integers.')
      parser.add_argument('-p', '--pretty', action='store_true', help='pretty print mypy errors')
      parser.add_argument('-C', '--clear', action='store_true', help='clear the terminal before running mypy')
  
      opts = parser.parse_args()
      if opts.pretty:
          args.append('--pretty')
  
      if opts.clear:
          print('\x1bc', end='', flush=True)
  
      print('Running mypy (this can take some time) ...')
      p = subprocess.run(
          [sys.executable, '-m', 'mypy'] + args + modules,
          cwd=root,
      )
      return p.returncode
  
  if __name__ == '__main__':
      sys.exit(main())
  
new_contents: #!/usr/bin/env python3
  
  from pathlib import Path
  import argparse
  import os
  import subprocess
  import sys
  import typing as T
  
  from mesonbuild.mesonlib import version_compare
  
  modules = [
      # fully typed submodules
      'mesonbuild/ast',
      'mesonbuild/cmake',
      'mesonbuild/compilers',
      'mesonbuild/dependencies',
      'mesonbuild/interpreterbase',
      'mesonbuild/scripts',
      'mesonbuild/wrap',
  
      # specific files
      'mesonbuild/arglist.py',
      # 'mesonbuild/coredata.py',
      'mesonbuild/envconfig.py',
      'mesonbuild/linkers.py',
      'mesonbuild/mcompile.py',
      'mesonbuild/mdevenv.py',
      'mesonbuild/mesonlib/platform.py',
      'mesonbuild/mesonlib/universal.py',
      'mesonbuild/minit.py',
      'mesonbuild/minstall.py',
      'mesonbuild/mintro.py',
      'mesonbuild/mlog.py',
      'mesonbuild/modules/fs.py',
      'mesonbuild/modules/unstable_rust.py',
      'mesonbuild/mparser.py',
      'mesonbuild/msetup.py',
      'mesonbuild/mtest.py',
      'mesonbuild/optinterpreter.py',
      'mesonbuild/programs.py',
  
      'run_mypy.py',
      'run_project_tests.py',
      'run_single_test.py',
      'tools'
  ]
  
  if os.name == 'posix':
      modules.append('mesonbuild/mesonlib/posix.py')
  elif os.name == 'nt':
      modules.append('mesonbuild/mesonlib/win32.py')
  
  def check_mypy() -> None:
      try:
          import mypy
      except ImportError:
          print('Failed import mypy')
          sys.exit(1)
      from mypy.version import __version__ as mypy_version
      if not version_compare(mypy_version, '>=0.902'):
          print('mypy >=0.902 is required, older versions report spurious errors')
          sys.exit(1)
  
  def main() -> int:
      check_mypy()
  
      root = Path(__file__).absolute().parent
      args = []  # type: T.List[str]
  
      parser = argparse.ArgumentParser(description='Process some integers.')
      parser.add_argument('-p', '--pretty', action='store_true', help='pretty print mypy errors')
      parser.add_argument('-C', '--clear', action='store_true', help='clear the terminal before running mypy')
  
      opts = parser.parse_args()
      if opts.pretty:
          args.append('--pretty')
  
      if opts.clear:
          print('\x1bc', end='', flush=True)
  
      print('Running mypy (this can take some time) ...')
      p = subprocess.run(
          [sys.executable, '-m', 'mypy'] + args + modules,
          cwd=root,
      )
      return p.returncode
  
  if __name__ == '__main__':
      sys.exit(main())
  
subject: Check mypy version to avoid spurious errors