# File lib/rainbows/configurator.rb, line 82
  def use(model, *options)
    check!
    mod = begin
      Rainbows.const_get(model)
    rescue NameError => e
      warn "error loading #{model.inspect}: #{e}"
      e.backtrace.each { |l| warn l }
      abort "concurrency model #{model.inspect} not supported"
    end
    Module === mod or abort "concurrency model #{model.inspect} not supported"
    options.each do |opt|
      case opt
      when Hash
        Rainbows::O.merge!(opt)
      when Symbol
        Rainbows::O[opt] = true
      else
        abort "cannot handle option: #{opt.inspect} in #{options.inspect}"
      end
    end
    mod.setup if mod.respond_to?(:setup)
    set[:use] = mod
  end