old_contents: import sys, os.path
  
  _importlist = "VisitorBase parse check".split()
  
  _cd = os.path.join(os.path.dirname(__file__))
  version_specific_path = None
  common_path = os.path.join(_cd, 'common')
  
  def _get_asdl_depending_on_version():
      '''Export names in the correct asdl.py depending on the python version.
      '''
  
      global version_specific_path
      major, minor = sys.version_info[0], sys.version_info[1]
      # Assumes that specific-path and common-path are a subdirectory
      # Build an absolute module path.
      prefix = __name__.rsplit('.', 1)
      # The else-case is for running tests in the current directory
      base = (prefix[0] + '.') if len(prefix) > 1 else ''
      dir = 'py%d_%d' % (major, minor)
      version_specific_path = os.path.join(_cd, dir)
  
      use_abs_import = 0
  
      modname = base + dir + '.asdl'
      try:
          # try to import from version specific directory
          mod = __import__(modname, fromlist=_importlist, level=use_abs_import)
      except ImportError:
          # fallback to import from common directory
          dir = 'common'
          modname = base + dir + '.asdl'
          mod = __import__(modname, fromlist=_importlist, level=use_rel_and_abs)
      for i in _importlist:
          globals()[i] = getattr(mod, i)
  
  def load(filename):
      '''Load ASDL from the version_specific_path if exists,
      or from the generic_path.
      '''
      srcfile = os.path.join(version_specific_path, filename)
      if not os.path.exists(srcfile):
          srcfile = os.path.join(common_path, filename)
      asdl = parse(srcfile)
      assert check(asdl), "Invalid asdl %s" % srcfile
      return asdl
  
  # initialize
  _get_asdl_depending_on_version()
  
new_contents: import sys, os.path
  
  _importlist = "VisitorBase parse check".split()
  
  _cd = os.path.join(os.path.dirname(__file__))
  version_specific_path = None
  common_path = os.path.join(_cd, 'common')
  
  def _get_asdl_depending_on_version():
      '''Export names in the correct asdl.py depending on the python version.
      '''
  
      global version_specific_path
      major, minor = sys.version_info[0], sys.version_info[1]
      # Assumes that specific-path and common-path are a subdirectory
      # Build an absolute module path.
      prefix = __name__.rsplit('.', 1)
      # The else-case is for running tests in the current directory
      base = (prefix[0] + '.') if len(prefix) > 1 else ''
      dir = 'py%d_%d' % (major, minor)
      version_specific_path = os.path.join(_cd, dir)
  
      use_abs_import = 0
  
      modname = base + dir + '.asdl'
      try:
          # try to import from version specific directory
          mod = __import__(modname, fromlist=_importlist, level=use_abs_import)
      except ImportError:
          # fallback to import from common directory
          dir = 'common'
          modname = base + dir + '.asdl'
          mod = __import__(modname, fromlist=_importlist) #, level=use_rel_and_abs)
      for i in _importlist:
          globals()[i] = getattr(mod, i)
  
  def load(filename):
      '''Load ASDL from the version_specific_path if exists,
      or from the generic_path.
      '''
      srcfile = os.path.join(version_specific_path, filename)
      if not os.path.exists(srcfile):
          srcfile = os.path.join(common_path, filename)
      asdl = parse(srcfile)
      assert check(asdl), "Invalid asdl %s" % srcfile
      return asdl
  
  # initialize
  _get_asdl_depending_on_version()
  
subject: Fix reference to unbound variable for missing import