Downcast from Any to a protocol

Question

I have the following code. How can I resolve the error in the last line?

protocol Animal {
    func walk()
}

struct Cat: Animal {
    func walk() {}

    in         


        

Answer 1

My approach

@objc protocol Animal {
    func walk()
}

@objc class DummyAnimal: Animal {
    func walk() {

    }
}

@objc class Cat: DummyAnimal {
    override func walk() {
        print("meow")
    }

    override init() { }
}

var obj: Any = Cat()
var cat = obj as DummyAnimal
cat.walk()