Accessor gives the wrong value in Swift 1.2/2.0 Release build only

Question

I found a very strange bug in my code that only happens in Release builds. It looks like a Swift bug to me, but let me know what you think.

import Foundation         


        

Answer 1

I think you've found a bug. A really interesting bug.

And I have a workaround for you: make Attribute a class instead of a struct. It will still be a value class, so the overhead will be low. You will have to give it an initializer that does what the struct memberwise initializer does. You'll find that the whole problem goes away when you do this.

EDIT: I thought of an even better workaround: Instead of making Attribute a class, make Level an @objc enum.

EDIT: The OP reports that this bug is fixed in Swift 2.1.