SE-0231 — Optional iteration

[Tino]

@ebg

It's already understood that with an empty array let arr = [Int]() , a for-in loop won't execute. It would seem almost obvious to a programmer that for a nil optional array, let arr: [Int]? = nil , a for-in loop also won't execute.

Odd: I was pretty sure that this was the first choice in this iteration... but something in this thread seems to be broken: Another try at allowing optional iteration - #3 by anthonylatsis

In short: I think allowing iteration of Sequence? received the most backlash from those who don't want the concept at all, and a single ? isn't that terrible for those who want a concise solution.