(x) => {foo: bar}

[Frankie Bagnardi]

let f = (x) => {foo: bar};

In the implementations I checked, this is actually allowed, but it's parsed
as a label instead of what you may expect at first glance (an object).

Is there any reason this is allowed?  If there's no reason other than to
match function(){}, this should be a syntax error, in my opinion.

A potentially easier and wider reaching solution here would be to restrict
labels in strict mode to demand a possible break/continue, else it's a
syntax error.  The only area I'd be concerned about compatibility is low
level generated JavaScript.

Thoughts?
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