@swift-5.10 @swift-5.10 -enable-experimental-feature AvailabilityMacro="SwiftStdlib 5.10:macOS 14.4, iOS 17.4, watchOS 10.4, tvOS 17.4" @swift-5.10 -Xfrontend -define-availability -Xfrontend "SwiftStdlib 5.10:macOS 14.4, iOS 17.4, watchOS 10.4, tvOS 17.4" @available(SwiftStdlib 5.10, *) func f() {} (edited)