michael@0: 
michael@0: var res = 0;
michael@0: 
michael@0: function foo(x, n, y) {
michael@0:   for (var j = 0; j < n; j++) {
michael@0:     x[j];
michael@0:     y.f;
michael@0:   }
michael@0: }
michael@0: 
michael@0: var x = [1,2,3,4,5];
michael@0: var y = {};
michael@0: Object.defineProperty(y, 'f', {get:function() { res++; x.length = 2; }});
michael@0: 
michael@0: var a = foo(x, 5, y);
michael@0: 
michael@0: assertEq(res, 5);