js/src/jit-test/tests/basic/testInnerTreeMutatingUpvars.js


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function f() {
    for (var a = 0; a < 8; ++a) {
        (function () {
            var x;
            for (var b = 0; b < 8; ++b) {
                x = 0;
                (function () {
                    for (var i = 0; i < 1; ++i) {
                        x = 1;
                    }
                })();
                x++;
            }
        })();
    }
}
f();