(function() {
    var o = {f: 1, g: 2};
    var p = {f: 1};
    var n = 1000000;
    for (var i = 0; i < n; ++i) {
        o.f = i;
        var tmp = o;
        o = p;
        p = tmp;
    }
    if (o.f != n - 2)
        throw "Error: bad value of o.f: " + o.f;
    if (p.f != n - 1)
        throw "Error: vad value of p.f: " + p.f;
})();