add: var err = new Error("xhr cancelled"); err.dojoType = "cancel"; return err; 
context: 	var _deferredCancel = function(/*Deferred*/dfd){		//summary: canceller function for dojo._ioSetArgs call.				dfd.canceled = true;		var xhr = dfd.ioArgs.xhr;		if(typeof xhr.abort == "function"){			xhr.abort();		}	}
meta: 4497	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/4497/8a803d575da075c11662a21e8082a64ac6fbf0d4/xhr.js/clean/_base/xhr.js