code: def fixup_parse_tree(cls_node):
      
      for node in cls_node.children:
          if node.type == syms.suite:
              # already in the preferred format, do nothing
              return
  
      # !%@#! oneliners have no suite node, we have to fake one up
      for i, node in enumerate(cls_node.children):
          if node.type == token.COLON:
              break
      else:
          raise ValueError("No class suite and no ':'!")
  
      # move everything into a suite node
      suite = Node(syms.suite, [])
      while cls_node.children[i+1:]:
          move_node = cls_node.children[i+1]
          suite.append_child(move_node.clone())
          move_node.remove()
      cls_node.append_child(suite)
      node = suite
docs: one-line classes don't get a suite in the parse tree so we add
          one to normalize the tree