protocol BaseRequest {
    associatedtype Parser
}
open class BaseParser { }

class ApiProvider<Target: BaseRequest, Parser: BaseParser> where Target.Parser == Parser {
    typealias ParserType = Parser
    
    public typealias SuccessBlcokClosure = (Parser) -> Void
    public typealias FailureBlcokClosure = (Error) -> Void
}

extension BaseRequest where Parser == ApiProvider<Self, Parser>.ParserType {//warning: Redundant same-type constraint 'Self.Parser' == 'Self.Parser'
    typealias Provider = ApiProvider<Self, Parser>
    
    func startRequest(success successCallback: Provider.SuccessBlcokClosure, failure failureCallback: Provider.FailureBlcokClosure) {
        
    }
}