rem: Divmod.logger.addObserver(function(event) { if (event['isError']) { print(event['error']); } }); 
add: Divmod.logger.addObserver(function(event) { throw new Error(observererr); }); 
context: Divmod.logger.addObserver(function(event) {    if (event['isError']) {        print(event['error']);    }});
meta: 1565	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/1565/da05a8d0211c49a054e715b41a4d90f60c81481a/test_object.js/buggy/nevow/test/test_object.js