Really wish protocols could be generic, but this seems to work?

gistfile1.swift

protocol Options {
}

class ConcreteOptions: Options {
    func hi() -> String {
        return "Hi"
    }
}

protocol ResponseParser {
    typealias OptionsType: Options
    
    func updateOptions(options: OptionsType)
}

class ConcreteParser: ResponseParser {
    typealias OptionsType = ConcreteOptions
    
    func updateOptions(options: ConcreteOptions) {
        print(options.hi())
    }
}

let parser = ConcreteParser()
parser.updateOptions(ConcreteOptions())