struct Object {
    let s: String
    let function: (Object) -> String
}
let object = Object(s: "Hello") { obj in
    return "\(obj.s)"
}
let mirror = Mirror(reflecting: object)
for child in mirror.children {
    if let f = child.value as? (Object) -> String {
        print(f(object))
    }
}

struct Object {
    let s: String
    let function: Any
    init(s: String, function: @escaping MyFunction) {
        self.s = s
        self.function = function
    }
}

struct A { let b: Any }
struct Z { let b: () -> Int }
let x = Int.random(in: .min ... .max)
assert((Mirror(reflecting: A { x }).descendant("b") as! () -> Int)() == x)
assert((Mirror(reflecting: Z { x }).descendant("b") as! () -> Int)() == x)