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: proxy_spec.rb
    path of file: ./repos/stackneveroverflow/vendor/bundle/ruby/2.3.0/gems/warden-1.2.7/spec/warden
    
    the code of the file until where you have to start completion: # encoding: utf-8
# frozen_string_literal: true
require 'spec
    
  def wrap_app(app, &blk)
    builder = Rack::Builder.new do
      use DynamicDefaultStrategies, &blk
      run app
    end
    builder.to_app
  end