Open Radar

 
Swift presents an opportunity to make Sets something closer to a first class collection type. While Dictionaries and Arrays are more commonly used than sets in Objective C, there are many cases where a Set is more desirable than either.  Core data uses sets extensively and the lack of a literal syntax, while manageable, is frustrating.

Set literal syntax would help to reduce the friction of using sets. 

Closure syntax allowing for 'bare' {} seems to preclude adopting python's set literal syntax, so I suggest <members>  

var array = ["foo", "bar", "foo", "baz"]
var dictionary = {"foo": "bar", "foo": "baz"}
var set = <"foo", "bar", "foo", "baz">