Can swift exit out of the root closure?

Question

In Swift, if I'm inside of a closure, that is itself inside of another function, is there a way to exit out of the function itself?

Here's an example of what this might look like using closures from the GCDKit library.

func test() {
    GCDQueue.Default.async {
        print("Print me!")
        return //Is there a statement that does this?
    }.notify(.Main) {
        print("Never print me.")
    }
}

Answer 1

No there is not. Closures run in self-contained environments. For all you know, by the time that closure is executed, the thread on which test() was called is no longer executing the test() method.