I have turned on the Chrome flag for experimental ECMAscript 6 features, one of which is Set. As I understand, the details of Set are broadly agreed upon by the spec writers.

I create a set a and add the string 'Hello'

a = Set();

a.add('Hello');

but how do I iterate over the elements of a?

for(let i of a) { console.log(i); }

gives SyntaxError: Illegal let declaration outside extended mode

for(var i of a) { console.log(i); }

gives SyntaxError: Unexpected identifier

for(var i in a) { console.log(i); }

gives Undefined

Is it possible to iterate over of a set in Chrome 26?