import Foundation

protocol Person {
    
    init()
    
}

extension Person {
    
    static func newPerson() -> Self {
        return self.init()
    }
    
}

class Driver: NSObject, Person {
    
    required override init() {
        super.init()
    }
    
}

var driver = Driver.newPerson()
print(driver)

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** +[Contents.Driver<0x1068de020> init]: cannot init a class object.'
*** First throw call stack:
(
    0   CoreFoundation                      0x00007fffaf5062cb __exceptionPreprocess + 171
    1   libobjc.A.dylib                     0x00007fffc433f48d objc_exception_throw + 48
    2   CoreFoundation                      0x00007fffaf58817f +[NSObject(NSObject) init] + 127
    3   ???                                 0x00000001068dd26f 0x0 + 4404925039
    4   ???                                 0x00000001068dd295 0x0 + 4404925077
    5   ???                                 0x00000001068dd112 0x0 + 4404924690
    6   ???                                 0x00000001068dd052 0x0 + 4404924498
    7   swift                               0x000000010144f74f _ZN4llvm5MCJIT11runFunctionEPNS_8FunctionENS_8ArrayRefINS_12GenericValueEEE + 655
    8   swift                               0x00000001014559b3 _ZN4llvm15ExecutionEngine17runFunctionAsMainEPNS_8FunctionERKNSt3__16vectorINS3_12basic_stringIcNS3_11char_traitsIcEENS3_9allocatorIcEEEENS8_ISA_EEEEPKPKc + 707
    9   swift                               0x0000000100862374 _ZL14performCompileRN5swift16CompilerInstanceERNS_18CompilerInvocationEN4llvm8ArrayRefIPKcEERiPNS_16FrontendObserverEPNS_20UnifiedStatsReporterE + 22532
    10  swift                               0x000000010085b304 _ZN5swift15performFrontendEN4llvm8ArrayRefIPKcEES3_PvPNS_16FrontendObserverE + 7332
    11  swift                               0x0000000100811728 main + 12248
    12  libdyld.dylib                       0x00007fffc4c24235 start + 1
    13  ???                                 0x000000000000000a 0x0 + 10
)
libc++abi.dylib: terminating with uncaught exception of type NSException
0  swift                    0x0000000103e8e3aa PrintStackTraceSignalHandler(void*) + 42
1  swift                    0x0000000103e8d7e6 SignalHandler(int) + 662
2  libsystem_platform.dylib 0x00007fffc4e33b3a _sigtramp + 26
3  libsystem_platform.dylib 0x00000003cdb15240 _sigtramp + 147724064
4  libsystem_c.dylib        0x00007fffc4cb8420 abort + 129
5  libc++abi.dylib          0x00007fffc380e84a __cxa_bad_cast + 0
6  libc++abi.dylib          0x00007fffc3833c4f default_unexpected_handler() + 0
7  libobjc.A.dylib          0x00007fffc43416fe _objc_terminate() + 103
8  libc++abi.dylib          0x00007fffc3830d69 std::__terminate(void (*)()) + 8
9  libc++abi.dylib          0x00007fffc38307de __cxxabiv1::exception_cleanup_func(_Unwind_Reason_Code, _Unwind_Exception*) + 0
10 libobjc.A.dylib          0x00007fffc433f5b6 objc_exception_throw + 345
11 CoreFoundation           0x00007fffaf58817f +[NSObject(NSObject) init] + 127
12 CoreFoundation           0x00000001068dd26f +[NSObject(NSObject) init] + 1463112047
13 CoreFoundation           0x00000001068dd295 +[NSObject(NSObject) init] + 1463112085
14 CoreFoundation           0x00000001068dd112 +[NSObject(NSObject) init] + 1463111698
15 CoreFoundation           0x00000001068dd052 +[NSObject(NSObject) init] + 1463111506
16 swift                    0x000000010144f74f llvm::MCJIT::runFunction(llvm::Function*, llvm::ArrayRef<llvm::GenericValue>) + 655
17 swift                    0x00000001014559b3 llvm::ExecutionEngine::runFunctionAsMain(llvm::Function*, std::__1::vector<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, std::__1::allocator<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > > > const&, char const* const*) + 707
18 swift                    0x0000000100862374 performCompile(swift::CompilerInstance&, swift::CompilerInvocation&, llvm::ArrayRef<char const*>, int&, swift::FrontendObserver*, swift::UnifiedStatsReporter*) + 22532
19 swift                    0x000000010085b304 swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 7332
20 swift                    0x0000000100811728 main + 12248
21 libdyld.dylib            0x00007fffc4c24235 start + 1
22 libdyld.dylib            0x000000000000000a start + 993902038
Stack dump:
0.  Program arguments: /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift -frontend -interpret Contents.swift -enable-objc-interop -sdk /Applications/Xcode-beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk -color-diagnostics -module-name Contents 
Abort trap: 6