rem: this.locked = true; 
add: this.lock(); 
context:     writeICS: function () {        this.locked = true;        if (!this.mUri)            throw Components.results.NS_ERROR_FAILURE;        // makeBackup will call doWriteICS        this.makeBackup(this.doWriteICS);    },
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/0defd389125b4b1ab8c53a084d478f9dd695fe02/calICSCalendar.js/buggy/calendar/providers/ics/calICSCalendar.js