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actual = ''; expected = '101,'; function looper(f) { for (var i = 0; i < 10; ++i) { for (var j = 0; j < 10; ++j) { f(); } } } function tester() { var x = 1; looper(function() { ++x; }); return x; } appendToActual(tester()); assertEq(actual, expected)