code: def dump_param_targets(self):
      rv = set()
      node = self
      while node is not None:
          for target, (instr, _) in iteritems(self.loads):
              if instr == VAR_LOAD_PARAMETER:
                  rv.add(target)
          node = node.parent
      return rv
  
imports: from ._compat import iteritems
  from .visitor import NodeVisitor
label_desc: Use image node_id 13 for calling the Symbols obj's underlying member method code with example usage: obj.dump_param_targets() and returns: rv