(function() {
    function foo(x) { return 1; }
    function bar(x) { return x; }
    
    var f = foo;
    var g = bar;
    
    var result = 0;
    var n = 100000;
    for (var i = 0; i < n; ++i) {
        result += f(42);
        
        var tmp = f;
        f = g;
        g = tmp;
    }
    
    if (result != n / 2 * 42 + n / 2 * 1)
        throw "Error: bad result: " + result;
})();