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actual = ''; expected = '0,1,2,3,4,5,6,7,8,9,'; function k(f_arg) { for (var i = 0; i < 10; ++i) { f_arg(i); } } function t() { var x = 1; k(function (i) { x = i; }); appendToActual(i); } for (var i = 0; i < 10; ++i) { t(); } assertEq(actual, expected)