src/third_party/mozjs-45/js/src/jit-test/tests/ion/lexical-check-3.js

function f() {

    function g(n) {
        n = n|0;
        var s = 0;
        for (var i = 0; (i = i + 1 |0) < 1000;) {
            s = s * i;
            if (!n) {
                s = x;
            }
        }
        return s;
    }

    return g;
    let x;
}

var func = f();
var r;
for (var i = 0; i < 2000; i++)
    r = func(i + 1);
assertEq(r, 0);