(x) => {foo: bar}

[Kevin Smith]

>
> var fn = () => ({ a, b } = { a: 0, b: 1 });
>
The expression `({ a, b } = { a: 0, b: 1 })` is a destructuring
assignment.  If there are lexical bindings for `a` and `b` it will assign
to those.  Otherwise, in strict mode it will fail with a ReferenceError.
In sloppy mode, it will assign to the global.

traceur is correct.
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