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function f(o) {
var res = 0;
for (var i=0; i<11000; i++) {
res += o.x;
}
return res;
}
function O(x) {
if (x)
this.x = 10;
}
f(new O(true));
// "o.x" is now missing so the idempotent cache should invalidate f.
f(new O(false));