(x) => {foo: bar}

[monolithed]

Can anyone explain what to expect as a result of the following expression?

var fn = () => ({ a, b } = { a: 0, b: 1 });

1.

var fn = function () {
    var a = 0,
          b = 1;

    return { a: a, b: b };
};

or

2. (traceur-compiler)

var fn = function () {
    var tmp;

    return (tmp = {a: 0, b: 1}, a = tmp.a, b = tmp.b, tmp);
};


There're global variables in the second case
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