[omochi@omochi-iMacPro k (master=)]$ cat Sources/App/main.swift import Nature import Japan import US var animals: [AnimalProtocol] = [] animals.append(createJapanCat()) animals.append(createUSCat()) animals.forEach { animal in print(animal.speak()) } [omochi@omochi-iMacPro k (master=)]$ swift run にゃあ meow