rem: if (this.mImmutable) throw Components.results.NS_ERROR_FAILURE; 
add: this.modify(); 
context:     addAttendee: function (attendee) {        if (this.mImmutable)            throw Components.results.NS_ERROR_FAILURE;        this.mAttendees.push(attendee);    },
meta: 5872	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5872/b002b50405b8e9e7d488725753081cc8335d6343/calItemBase.js/clean/calendar/base/src/calItemBase.js