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var a = [];
for (var i = 0; i < 2000; i++)
a.push({f:i});
function f() {
var total = 0;
for (var i = 0; i < a.length; i++)
total += a[i].f;
return total;
}
assertEq(f(), 1999000);
var sub = Object.create(a[0]);
assertEq(f(), 1999000);