code: def vlineto(args):
      if not args:
          raise ValueError(args)
      it = iter(args)
      try:
          while True:
              yield ("rlineto", [0, next(it)])
              yield ("rlineto", [next(it), 0])
      except StopIteration:
          pass
  
imports: from fontTools.cffLib import maxStackLimit
label_desc: Use image node_id 6 for calling the _GeneralizerDecombinerCommandsMap obj's underlying member method code with example usage: obj.vlineto(args) without return types