import Foundation

@objc protocol P {
    @objc(doF) optional func f() -> Int
}

class Gen<T>: NSObject, P {}
class NoGen:  NSObject, P {}

class NoGen1: NoGen {
    func f() -> Int {
        return 42
    }
}
(NoGen1() as P).f?() // 42, works

class Gen1: Gen<Any> {
    func f() -> Int {
        return 42
    }
}
(Gen1() as P).f?() // nil <----------

class Gen2: Gen<Any> {
    @objc(doF) func f() -> Int { // explicitly set objc name
        return 42
    }
}
(Gen2() as P).f?() // 42, works again