docs: def update_module_file(redbaron_tree, module_path, show_diff=False, dry_run=False):
      """Set show_diff to False to overwrite module_path with a new file generated from
      ``redbaron_tree``.
  
      Returns True if tree is different from source.
  
      """
      with tempfile.NamedTemporaryFile() as tmp_file:
          tmp_file.write(redbaron_tree_to_module_str(redbaron_tree))
          tmp_file.seek(0)
          if are_files_equal(module_path, tmp_file.name):
              logging.debug('Source unchanged')
              return False
  
          logging.debug('Source modified')
  
          tmp_file.seek(0)
          diff_update_file(module_path, tmp_file.read(), show_diff, dry_run)