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: gem_dirs_verification.rb
    path of file: ./repos/truffleruby/lib/truffle/rubygems
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

# Copyright (c) 2018, 2024 Oracle and/or its affiliates. A
    
    def install_hook
      install_hook = -> tool do
        install_dir = tool.gem_home
        return unless install_dir # gem is not being installed, just e.g. registered by bundler from a path

        bad_dirs = Truffle::GemUtil.bad_gem_dirs Gem.path
        bad_install_dir = bad_dirs.include? install_dir
        unless bad_dirs.empty?
          unless tool.ask_yes_no <<-TXT.gsub(/^ +/, '').chomp, true

            The gem directories are not configured properly.
            The gem install directory #{install_dir} #{bad_install_dir ? 'is not' : 'might not be'} correct.
            It has to be marked with the #{MARKER_NAME} file as belonging to TruffleRuby.
            The gem might be installed into a gem directory belonging to another Ruby implementation.
            Continue installing?
          TXT
            raise Gem::InstallError,
                  "The gem directory #{install_dir} is not correct. Gem installation aborted."
          end
        end