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https://useyourloaf.com/blog/objc-warnings-upgrading-to-swift-4/
@objc Warnings Upgrading To Swift 4
Open a Swift 3 project in Xcode 9 and it will warn you that you can upgrade to Swift 4. If you accept the invite you end up with another warning that Swift 4 mode deprecates the Swift 3 @objc inference rules. What is this scary sounding warning and how do you make it go away?
Matching Regular Expressions
https://useyourloaf.com/blog/swift-4-access-levels/

Swift 4 Access Levels
You may not have noticed but there was a small but important change to the private access level in Swift 4. After a quick recap of the five levels I cover what has changed in Swift 4, what do you need to know when migrating from Swift 3 and what is the point of fileprivate now?