Cannot convert value of type '(_) -> Observable<Response>'
to expected argument type '([_]) -> _'

func request(_ token: MidoriMoyaAPI) -> Observable<Moya.Response> {
    switch (target.requiresCSRF, target.requiresOAuth) {
    case (false, false): return actualRequest
    case (true, false): return CSRFTokenRequest().flatMap { _ in actualRequest }
    case (false, true): return OAuthTokenRequest().flatMap { _ in actualRequest }
    case (true, true): return Observable.zip([CSRFTokenRequest(), OAuthTokenRequest()]) { _ in actualRequest }
    }
}