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function f(x) {
assertEq(x.at(0), 1);
assertEq(x.at(-1), 3);
assertEq(x.at(10), undefined);
}
function g() {
for (var i = 0; i < 100; i++) {
f([1, 2, 3]);
}
}
for (var j = 0; j < 10; j++) {
g();
}