# File kwartz.rb, line 4196
        def self.fetch(input_str)
            converter  = Kwartz::DefaultConverter.new(input_str, {})
            converter.instance_eval {
                def self.fetch
                    return _fetch()
                end
            }
            s = ''
            while fv = converter.fetch() do
                s << fv.head_text.inspect << " + " << fv.tag_str.inspect << "\n"
            end
            return s
        end