[omochi@omochi-iMac temp]$ docker run --privileged -it --rm norionomura/swift:4020170827a swift -I /usr/lib/swift/clang/include Welcome to Swift version 4.0-dev (LLVM 2dedb62a0b, Clang b9d76a314c, Swift 0899bd328a). Type :help for assistance. 1> public class Animal 2. { 3. public init() {} 4. public convenience init(init0 int: Int) { self.init() } 5. } 6> public class Cat : Animal { 7. public override init() {} 8. } 9> Cat.init(init0: 33) $R0: Cat = { __lldb_expr_1.Animal = {} }