# File lib/ruby_parser_extras.rb, line 120
  def arg_add(node1, node2) # TODO: nuke
    return s(:arglist, node2) unless node1

    node1[0] = :arglist if node1[0] == :array
    return node1 << node2 if node1[0] == :arglist

    return s(:arglist, node1, node2)
  end