JSTests/microbenchmarks/getter-no-activation.js

(function() {
    var o = {_f:42};
    o.__defineGetter__("f", function() { return this._f; });
    (function() {
        var result = 0;
        var n = 2000000;
        for (var i = 0; i < n; ++i)
            result += o.f;
        if (result != n * 42)
            throw "Error: bad result: " + result;
    })();
})();