Without JsonDeserializer as a generic constraint

TEParserProtocol3.swift

class SomeDeserializer<T>: JsonDeserializer {
    private let deserializer: JsonDeserializer

    init<D: JsonDeserializer>(deserializer: D) where D.Response == T {
        self.deserializer = deserializer
    }

    func parse(json: [String : Any]) -> T {
        return deserializer.parse(json: json)
    }
}