swift4.1.5

Swift 4.2 came out and I'm receiving this error message in my project when using ObjectMapper and some other pods too: Module compiled with Swift 4.1.2 cannot be imported in Swift 4.1.50 So how do I tell Xcode to start updating my project and migrate it to Swift 4.2? In Swift 4.2 there is a change in implementation of Implicitly Unwrapped Optional (IUO) , as per the swift blog now implicit unwrapped optional T! will be considered as T? with and extra flag for the compiler to know it is an implicit unwrap optional. The new mental model for IUOs is one where you consider ! to be a synonym for ?

After updating to Xcode 10 beta, which apparently comes with Swift 4.1.50, I'm seeing the following error which I'm not sure how to fix: Cannot invoke initializer for type 'Range< String.Index>' with an argument list of type '(Range< String.Index>)' in the following function at Range<Index>(start..<self.endIndex) (line 3): func index(of aString: String, startingFrom position: Int? = 0) -> String.Index? { let start: String.Index = self.index(self.startIndex, offsetBy: position!) let range: Range<Index> = Range<Index>(start..<self.endIndex) return self.range(of: aString, options: .literal, range