Availability.swift

import CoreBluetooth

class Test: NSObject, CBPeripheralManagerDelegate {
    func peripheralManager(_ peripheral: CBPeripheralManager, didAdd service: CBService, error: Error?) {

        let peripheral: CBPeripheral

        // So what I would like is something like this
        // But this does not work :(
        if  #available(iOS 15, *) {
            guard let nonOptional = service.peripheral else {
                return
            }
            peripheral = nonOptional
        } else {
            peripheral = service.peripheral
        }
        let result: CBPeripheral = peripheral
        print ("\(result)")
    }
    
    func peripheralManagerDidUpdateState(_ peripheral: CBPeripheralManager) {
    }
}