[swift-evolution] Extending declaration scope to condition for `repeat { } while ()`

[Kevin Nattinger]

I would love this behavior, I ran into a case just a week or two ago where I was wishing for this behavior.

That said, I’m not sure whether it would be possible / feasible for the compiler. And it’s additive so it will have to wait for after Swift 3 is released.

> On Jul 18, 2016, at 10:52 AM, Braeden Profile via swift-evolution <swift-evolution at swift.org> wrote:
> 
> Good morning, Swift community!
> 
> I’ve come across a situation a number of times where I write code that has to try something one or more times using a `repeat…while` loop and the condition relies upon variables that should be declared within the scope of the loop.
> 
> repeat
> {
> 	let success = doSomething()
> }
> while !success
> 
> The compiler unnecessarily prohibits this:  “Use of unresolved identifier four.”  In this simple case, we can write:
> 
> repeat
> { }
> while !doSomething()
> 
> But in a more complex situation, we are forced to write:
> 
> var success: Bool
> repeat
> {
> 	success = doSomething()
> }
> while !success
> 
> 
> We could change this so that the declarations within the top level scope of the loop are accessible from the condition.
> 
> Thanks for reading my first post to the Swift discussion board!
> —Braeden
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