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function f(arr) {
var x;
for (var i=0; i<100; i++) {
x = arr.pop();
}
return x;
}
var arr = [];
for (var i=0; i<130; i++) {
arr.push({i: i});
}
assertEq(f(arr).i, 30);
assertEq(arr.length, 30);
assertEq(f(arr), undefined);
assertEq(arr.length, 0);