You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: ac.rb
    path of file: ./repos/powerstation/powerstation/lib/compiled-jruby/lib/ruby/stdlib/optparse
    
    the code of the file until where you have to start completion: require 'optparse'

class OptionParser::AC < OptionParser
  private

  def _check_ac_args(name, block)
    unless /\A\w[-\w]*\z/ =~ name
      raise ArgumentError, name
    end
    unless block
      raise ArgumentError, "no block given", ParseError.filter_backtrace
    
  def ac_arg_with(name, help_string, &block)
    _check_ac_args(name, block)

    sdesc = []
    ldesc = ["--with-#{name}"]
    desc = [help_string]
    q = name.downcase
    with = Switch::PlacedArgument.new(*search(:atype, String), sdesc, ldesc, nil, desc, block)
    without = Switch::NoArgument.new(nil, proc {}, sdesc, ldesc, nil, desc, block)
    top.append(with, [], ["with-" + q], without, ['without-' + q])
    with
  end