code: def start_tree(self, tree, filename):
      super(FixNext, self).start_tree(tree, filename)
  
      n = find_binding("next", tree)
      if n:
          self.warning(n, bind_warning)
          self.shadowed_next = True
      else:
          self.shadowed_next = False
  
file_path: catboost/contrib/tools/python/src/Lib/lib2to3/fixes/fix_next.py
imports: from ..pgen2 import token
  from ..pygram import python_symbols
  from ..None import fixer_base
  from ..fixer_util import Name, Call, find_binding
label_desc: Use image node_id 1 for calling the FixNext obj's underlying member method code with example usage: obj.start_tree(tree, filename) without return types