current_line (REXML::IOSource)

    # File temp/source.rb, line 188
                    def current_line
                            pos = @er_source.pos                         # The byte position in the source
                            lineno = @er_source.lineno   # The XML < position in the source
                            @er_source.rewind
                            line = 0                                                                             # The \r\n position in the source
                            begin
                                    while @er_source.pos < pos
                                            @er_source.readline
                                            line += 1
                                    end
                            rescue
                            end
                            [pos, lineno, line]
                    end