将分割错误转换为Swift 4

I am in the process of updating a project to iOS 11/Swift 4. I have updated to Swift 3.2 and have a project that builds with one warning: "Conversion to Swift 4 available". So I click the warning and start the migration assistant with the option "Minimize Inference" when asked about Swift 4 @objc Inference.I am in the process of updating a project to iO