How to iterate over a custom object given below with async sequence enum FetchError: Error { case badImage case badRequest case invalidImageURL case noURL case failedToFetchImage } struct Photo: Codable { let albumId: Int let id: Int let title: String let urlPath: String let thumbnailUrl: String } What i have tried :- func fetchAsyncImage(request:URLRequest) async throws -> [UIImage] { let (data, response) = try await URLSession.shared.data(for: request) guard (response as? HTTPURLResponse)?.statusCode == 200 else { throw FetchError.badRequest } let photos = try JSONDecoder().decode([Photo].self, from: data) guard let imagePath = photos.first?.urlPath, let imageURL = URL.init(string: imagePath) else { throw FetchError.noURL } var imageArr:[UIImage] = [] // getting error in following 2 lines // Error: For-in loop requires '[Photo]' to conform to 'AsyncSequence' for await photo in photos { // Error: Type of expression is ambiguous without more context guard let imagePath = photo.urlPath, let imageURL = URL.init(string: imagePath) else { throw FetchError.noURL } do { let (imageData, imageResponse) = try await URLSession.shared.data(from: imageURL) guard (imageResponse as? HTTPURLResponse)?.statusCode == 200 else { throw FetchError.invalidImageURL } guard let image = UIImage(data: imageData) else { throw FetchError.badImage } imageArr.append(image) } catch { throw FetchError.failedToFetchImage } } return imageArr } I tried implementing AsyncSequenc and AsyncIteratorProtocol on Photo struct as follows:- struct Photo: Codable, AsyncSequence {   typealias Element = URL       let albumId: Int   let id: Int   let title: String   let urlPath: String   let thumbnailUrl: String       struct AsyncIterator: AsyncIteratorProtocol {     let urlPath: String     mutating func next() async throws -> URL? {       do {         guard let imageURL = URL.init(string: urlPath) else { throw FetchError.noURL }         return imageURL       } catch {         throw FetchError.invalidImageURL       }     }   }       func makeAsyncIterator() -> AsyncIterator {     AsyncIterator(urlPath: urlPath)   } }