var x = Symbol();
var y = Symbol();
var a = Symbol();
var b = Symbol();
var c = Symbol();
var d = Symbol();
var e = Symbol();
var f = Symbol();
var g = Symbol();
var h = Symbol();
var i = Symbol();

function foo(o) {
    o[x] = 1;
    o[y] = 2;
    o[a] = 3;
    o[b] = 4;
    o[c] = 5;
    o[d] = 6;
    o[e] = 7;
    o[f] = 8;
    o[g] = 9;
    o[h] = 10;
    o[i] = 11;
}

function Foo() {
    foo(this);
}

var result = 0;

for (var i = 0; i < 100000; ++i) {
    foo({[f]:42});
    result += (new Foo())[x];
}

if (result != 100000)
    throw "Bad result: " + result;