class Opal::Nodes::ArgsNode

def compile
  same_arg_counter = {}
  children.each_with_index do |arg, idx|
    if multiple_underscore?(arg)
      same_arg_counter[arg] ||= 0
      same_arg_counter[arg]  += 1
      if same_arg_counter[arg] > 1
        arg = s(arg.type, :"#{arg.children[0]}_$#{same_arg_counter[arg]}")
      end
    end
    push ', ' if idx != 0
    push process(arg)
  end
end

def multiple_underscore?(arg)
  arg.type == :arg &&
    arg.children.count == 1 &&
    arg.children.first.to_s.start_with?('_') &&
    children.count(arg) > 1
end