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actual = ''; expected = '5,4,3,2,1,X,5,4,3,2,1,Y,5,4,3,2,1,'; function f() { for (var i = 0; i < 5; ++i) { var args = arguments; appendToActual(args[i]); } } f(5, 4, 3, 2, 1); appendToActual("X"); f(5, 4, 3, 2, 1); appendToActual("Y"); f(5, 4, 3, 2, 1); assertEq(actual, expected)