JSTests/stress/regress-185995.js

(function() {
    var exception;
    try {
        var list = { 'a' : 5 };
        for(const { x = x } in list)
            x();
    } catch (e) {
        exception = e;
    }

    if (exception != "ReferenceError: Cannot access 'x' before initialization.")
        throw "FAILED";
})();