michael@0: function testHolePushing() {
michael@0:     var a = ["foobar", "baz"];
michael@0:     for (var i = 0; i < 5; i++)
michael@0:         a = [, "overwritten", "new"];
michael@0:     var s = "[";
michael@0:     for (i = 0; i < a.length; i++) {
michael@0:         s += (i in a) ? a[i] : "<hole>";
michael@0:         if (i != a.length - 1)
michael@0:             s += ",";
michael@0:     }
michael@0:     return s + "], " + (0 in a);
michael@0: }
michael@0: assertEq(testHolePushing(), "[<hole>,overwritten,new], false");