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function bar(x, i) { if (i == 50) foo.arguments[1] = 20; } function foo(x, j, n) { var a = 0; arguments; for (var i = 0; i < n; i++) { var q = x[j]; bar(x, i); if (typeof q == 'undefined') a++; } return a; } var a = foo([1,2,3,4], 3, 100); assertEq(a, 0);