I have my project running perfectly fine on Xcode 16. However, in Xcode 26 it doesn't build due to an error that I do not understand. I have three files that pertain to this error:
// FriendListResponse.swift
import Foundation
struct FriendListResponse: Decodable {
var friendships: [Friendship]
var collections: [FriendCollection]
}
// Friendship.swift
import Foundation
struct Friendship: Decodable {
var createdAt: String
var friendId: Int
var friendUserId: Int // user ID of the friend
var friendUsername: String
var id: Int
var tagNames: [String]
}
// FriendCollection.swift
struct FriendCollection: Decodable {
var id: Int
var permalink: String
var tagNames: [String]
var title: String
}
On the first file, FriendListResponse.swift, I am the simple error message "circular reference." I do not understand how these self-contained structs could create a circular reference. Although I have other data types in my project, none of them are even referenced in these files except for Friendship and FriendCollection.
The FriendListResponse is a struct that is created from JSON values that are fetched from an API. This is the function that fetches the JSON:
public static func listFriends(username: String) async throws -> [Friendship] {
let data = try await sendGETRequest(
url: "people/\(username)/friends/list.json"
)
print(String(data: data, encoding: .utf8)!)
let decoder = JSONDecoder()
decoder.keyDecodingStrategy = .convertFromSnakeCase
let wrapper = try decoder.decode(FriendListResponse.self, from: data)
return wrapper.friendships
}
// Note: the function sendGETRequest is just
// a function that I have created that takes a set
// of parameters and returns a data object
// using the HTTP GET protocol. I don't think
// that it is related to this issue. However, if you
// think that it is, I can share the code for that.
This error has also happened in a few other cases within contained networks of my data structure.
I do not know why this error is only appearing once I launch Xcode 26 beta with my project files. I would think that this error also would appear in Xcode 16.4.
Any help would be greatly appreciated in my process to compile my project on Xcode 26!