@hiragram
func fastUnwrap<T>(_ arg: ImplicitlyUnwrappedOptional<T>) -> Optional<T> { switch arg { case .some(let wrapped): return .some(wrapped) case .none: return .none } } var fuga1: Int! = 1 var piyo1: Int! = 1 struct A { var fuga: Int? var piyo: Int? } let hoge: [A] = [ A(fuga: fastUnwrap(fuga1), piyo: fastUnwrap(piyo1)), A(fuga: fastUnwrap(fuga1), piyo: fastUnwrap(piyo1)), A(fuga: fastUnwrap(fuga1), piyo: fastUnwrap(piyo1)), A(fuga: fastUnwrap(fuga1), piyo: fastUnwrap(piyo1)), A(fuga: fastUnwrap(fuga1), piyo: fastUnwrap(piyo1)), A(fuga: fastUnwrap(fuga1), piyo: fastUnwrap(piyo1)) ]