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import Foundation
@objc protocol SomethingDoable {
    func doSomething()
}
class Inner: SomethingDoable {
    @objc func doSomething() {
        print("Inner!")
    }
}
@objc class Outer: NSObject {
    let inner: SomethingDoable = Inner()
    override func forwardingTarget(for aSelector: Selector!) -> Any? {
        return inner
    }
}
let outer = Outer()
outer.perform(#selector(SomethingDoable.doSomething))





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