add: return val; 
context:   set engines(val) {    this._engines = val;  },
meta: 5872	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5872/599cc60aa0b66effdc586d52ca8f8f2c2902b50f/engineManager.js/clean/browser/components/search/content/engineManager.js