michael@0: var a = [1, 2, 3];
michael@0: var b = [4, 5, 6];
michael@0: 
michael@0: function testFold() {
michael@0:     for (var i=0; i<10; i++) {
michael@0:         var x = a[i];
michael@0:         var y = a[i];
michael@0:         var z = b[i];
michael@0:         assertEq(x, y);
michael@0:         if (i < 3)
michael@0:             assertEq(x !== z, true);
michael@0:     }
michael@0: }
michael@0: for (var i=0; i<10; i++)
michael@0:     testFold();