michael@0: var r;
michael@0: Object.defineProperty(this, "x", {value: 0, writable: false});
michael@0: 
michael@0: for (var a = 0; a < 10; ++a)
michael@0:     r = ++x;
michael@0: assertEq(x, 0);
michael@0: assertEq(r, 1);
michael@0: 
michael@0: for (var a = 0; a < 10; ++a)
michael@0:     r = --x;
michael@0: assertEq(x, 0);
michael@0: assertEq(r, -1);
michael@0: 
michael@0: for (var a = 0; a < 10; ++a)
michael@0:     r = x++;
michael@0: assertEq(x, 0);
michael@0: assertEq(r, 0);
michael@0: 
michael@0: for (var a = 0; a < 10; ++a)
michael@0:     r = x--;
michael@0: assertEq(x, 0);
michael@0: assertEq(r, 0);