add: return val; 
context:   set engines(val) {    this._engines = val;  },
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/ea6caf7eeb5138356e8afccb7d43f0925257d70b/engineManager.js/clean/browser/components/search/content/engineManager.js