Cannot convert value of type 'UIBarButtonItem!' to expected argument type '_OptionalNilComparisonType'

I'm trying to follow the FoodTracker tutorial on Apple Developer. Right now I'm on the section "Implementing Navigation". It looks like this tutorial was written for a previous version of Swift as the code doesn't work sometimes without having to change overridden method signatures. Here's an example: ``` // This method lets you configure a view controller // before it's presented. override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) { ``` On my version of Xcode (8.0) that method has to change to: ``` override func prepare(for: UIStoryboardSegue, sender: Any?) { ``` ...so that it matches the appropriate method in the parent class/protocol that needs to be overridden. The tutorial continues with the following line of code: ``` if saveButton == sender { ``` ...which produces the error on the subject line. I have spent the last few hours trying to fix this, searching online, trying to figure out why the optional sender Any? doesn't match a UIBarButtonItem but have been unsuccessful, so as a last resort I am posting here. I have been attempting to follow a couple of books on iOS development, but I was running into problems with the code as well (doesn't work in the current version of Xcode(8.0)/Swift(3), so I decided to spend time on the official Apple tutorial. Thanks in advance for any help you can provide.