# File lib/isolate/sandbox.rb, line 262
    def path
      base = @options.fetch :path, "tmp/isolate"

      unless @options.key?(:multiruby) && @options[:multiruby] == false
        suffix = "#{Gem.ruby_engine}-#{RbConfig::CONFIG['ruby_version']}"
        base   = File.join(base, suffix) unless base =~ /#{suffix}/
      end

      File.expand_path base
    end