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actual = ''; expected = '2,5,'; function loop(f) { var p; for (var i = 0; i < 1000; ++i) { p = f(); } return p; } function f(k) { function g() { return k; } k = 2; appendToActual(loop(g)); k = 5; appendToActual(loop(g)); } f(); assertEq(actual, expected)