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: thin.rb
    path of file: ./repos/truffleruby/bench/sinatra/bundle/gems/rack-2.2.3/lib/rack/handler
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require "thin"
require "thin/server"
require "thin/logging"
require "thin/backends/tcp_server"

module Rack
  module Handler
    class Thin
      def self.run(app, **options)
        environment  = ENV['RACK_ENV'] || 'development'
        default_host = environment == 'development' ? 'localhost' : '0.0.0.0'

        host = options.delete(:Host) || default_host
        port = options.delete(:Port) || 8080
        args = [host, port, app, options]
        # Thin versions below 0.8.0 do not support addit
    
      def self.run(app, **options)
        environment  = ENV['RACK_ENV'] || 'development'
        default_host = environment == 'development' ? 'localhost' : '0.0.0.0'

        host = options.delete(:Host) || default_host
        port = options.delete(:Port) || 8080
        args = [host, port, app, options]
        # Thin versions below 0.8.0 do not support additional options
        args.pop if ::Thin::VERSION::MAJOR < 1 && ::Thin::VERSION::MINOR < 8
        server = ::Thin::Server.new(*args)
        yield server if block_given?
        server.start
      end

      def self.valid_options
        environment  = ENV['RACK_ENV'] || 'development'
        default_host = environment == 'development' ? 'localhost' : '0.0.0.0'

        {
          "Host=HOST" => "Hostname to listen on (default: #{default_host})",
          "Port=PORT" => "Port to listen on (default: 8080)",
        }
      end
    end