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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