rem: return null; 
context:   QueryInterface : function(iid)   {     if(iid.equals(Components.interfaces.nsIMsgDBViewCommandUpdater))	    return this;	       throw Components.results.NS_NOINTERFACE;     return null;    }
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/f1ea69808eba776b979a2ce0c73a36e2555cdc76/threadPane.js/buggy/mailnews/base/resources/content/threadPane.js