michael@0: function testChangingObjectWithLength()
michael@0: {
michael@0:   var obj = { length: 10 };
michael@0:   var dense = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
michael@0:   var slow = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]; slow.slow = 5;
michael@0: 
michael@0:   /*
michael@0:    * The elements of objs constitute a De Bruijn sequence repeated 4x to trace
michael@0:    * and run native code for every object and transition.
michael@0:    */
michael@0:   var objs = [obj, obj, obj, obj,
michael@0:               obj, obj, obj, obj,
michael@0:               dense, dense, dense, dense,
michael@0:               obj, obj, obj, obj,
michael@0:               slow, slow, slow, slow,
michael@0:               dense, dense, dense, dense,
michael@0:               dense, dense, dense, dense,
michael@0:               slow, slow, slow, slow,
michael@0:               slow, slow, slow, slow,
michael@0:               obj, obj, obj, obj];
michael@0: 
michael@0:   var counter = 0;
michael@0: 
michael@0:   for (var i = 0, sz = objs.length; i < sz; i++)
michael@0:   {
michael@0:     var o = objs[i];
michael@0:     for (var j = 0; j < o.length; j++)
michael@0:       counter++;
michael@0:   }
michael@0: 
michael@0:   return counter;
michael@0: }
michael@0: assertEq(testChangingObjectWithLength(), 400);