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function popper(a) { return a.pop(); } function foo(x) { for (var i = 0; i < 10; i++) { var q = popper(x); if (i < 5) assertEq(q, 5 - i); else assertEq(q, undefined); } return q; } var q = foo([1,2,3,4,5]); assertEq(q, undefined);