rem: if (valsOnly) yield vals[i]; 
add: if (keysOnly) yield keys[i]; 
context:       var gen =        function()        {          for (var i = 0; i < keys.length; i++)          {            if (valsOnly)              yield vals[i];            else              yield [keys[i], vals[i]];          }        };
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/21e5fd1459be4df35f1152a4cd39e85122c46726/basic-for-in.js/buggy/js/tests/js1_7/iterable/basic-for-in.js