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: util.rb
    path of file: ./repos/truffleruby/lib/mri/bundler/vendor/thor/lib/thor
    
    the code of the file until where you have to start completion: require "rbconfig"

class Bundler::Thor
  module Sandbox #:nodoc:
  end

  # This module holds several utilities:
  #
  # 1) Methods to convert thor namespaces to c
    
      def namespaces_in_content(contents, file = __FILE__)
        old_constants = Bundler::Thor::Base.subclasses.dup
        Bundler::Thor::Base.subclasses.clear

        load_thorfile(file, contents)

        new_constants = Bundler::Thor::Base.subclasses.dup
        Bundler::Thor::Base.subclasses.replace(old_constants)

        new_constants.map!(&:namespace)
        new_constants.compact!
        new_constants
      end