Existential any to protocol for Swift 6 (#3370)

* Apply existential any to protocol for Swift 6

* Update Package@swift-6.0.swift

* Update Package.swift

* Apply any to Macro.Type

* Apply any for the rest

* Applying the any keyword internally for typealias in a _KeyPath

* Undoing accidental syntax

---------

Co-authored-by: Stephen Celis <stephen@stephencelis.com>
Co-authored-by: Stephen Celis <stephen.celis@gmail.com>

Examples/CaseStudies/SwiftUICaseStudies/02-SharedState-Notifications.swift

@@ -24,7 +24,7 @@ struct SharedStateNotifications {
  @SharedReader(.screenshotCount) var screenshotCount = 0
  }
  enum Action {
- case factResponse(Result<String, Error>)
+ case factResponse(Result<String, any Error>)
  case onAppear
  }
  @Dependency(\.factClient) var factClient

Examples/CaseStudies/SwiftUICaseStudies/03-Effects-Basics.swift

@@ -32,7 +32,7 @@ struct EffectsBasics {
  case decrementDelayResponse
  case incrementButtonTapped
  case numberFactButtonTapped
- case numberFactResponse(Result<String, Error>)
+ case numberFactResponse(Result<String, any Error>)
  }
 
  @Dependency(\.continuousClock) var clock

Examples/CaseStudies/SwiftUICaseStudies/03-Effects-Cancellation.swift

@@ -25,7 +25,7 @@ struct EffectsCancellation {
  case cancelButtonTapped
  case stepperChanged(Int)
  case factButtonTapped
- case factResponse(Result<String, Error>)
+ case factResponse(Result<String, any Error>)
  }
 
  @Dependency(\.factClient) var factClient

Examples/CaseStudies/SwiftUICaseStudies/03-Effects-Refreshable.swift

@@ -23,7 +23,7 @@ struct Refreshable {
  enum Action {
  case cancelButtonTapped
  case decrementButtonTapped
- case factResponse(Result<String, Error>)
+ case factResponse(Result<String, any Error>)
  case incrementButtonTapped
  case refresh
  }

Examples/CaseStudies/SwiftUICaseStudies/03-Effects-WebSocket.swift

@@ -29,7 +29,7 @@ struct WebSocket {
  case alert(PresentationAction<Alert>)
  case connectButtonTapped
  case messageToSendChanged(String)
- case receivedSocketMessage(Result<WebSocketClient.Message, Error>)
+ case receivedSocketMessage(Result<WebSocketClient.Message, any Error>)
  case sendButtonTapped
  case sendResponse(didSucceed: Bool)
  case webSocket(WebSocketClient.Action)
@@ -227,7 +227,7 @@ struct WebSocketClient {
  var open: @Sendable (_ id: ID, _ url: URL, _ protocols: [String]) async -> AsyncStream<Action> = {
  _, _, _ in .finished
  }
- var receive: @Sendable (_ id: ID) async throws -> AsyncStream<Result<Message, Error>>
+ var receive: @Sendable (_ id: ID) async throws -> AsyncStream<Result<Message, any Error>>
  var send: @Sendable (_ id: ID, _ message: URLSessionWebSocketTask.Message) async throws -> Void
  var sendPing: @Sendable (_ id: ID) async throws -> Void
 }
@@ -295,7 +295,7 @@ extension WebSocketClient: DependencyKey {
  try self.socket(id: id).cancel(with: closeCode, reason: reason)
  }
 
- func receive(id: ID) throws -> AsyncStream<Result<Message, Error>> {
+ func receive(id: ID) throws -> AsyncStream<Result<Message, any Error>> {
  let socket = try self.socket(id: id)
  return AsyncStream { continuation in
  let task = Task {

Examples/CaseStudies/SwiftUICaseStudies/04-NavigationStack.swift

@@ -190,7 +190,7 @@ struct ScreenA {
  case dismissButtonTapped
  case incrementButtonTapped
  case factButtonTapped
- case factResponse(Result<String, Error>)
+ case factResponse(Result<String, any Error>)
  }
 
  @Dependency(\.dismiss) var dismiss

Examples/CaseStudies/SwiftUICaseStudies/05-HigherOrderReducers-ResuableOfflineDownloads/DownloadClient.swift

@@ -3,7 +3,7 @@ import Foundation
 
 @DependencyClient
 struct DownloadClient {
- var download: @Sendable (_ url: URL) -> AsyncThrowingStream<Event, Error> = { _ in .finished() }
+ var download: @Sendable (_ url: URL) -> AsyncThrowingStream<Event, any Error> = { _ in .finished() }
 
  @CasePathable
  enum Event: Equatable {

Examples/CaseStudies/SwiftUICaseStudies/05-HigherOrderReducers-ResuableOfflineDownloads/DownloadComponent.swift

@@ -14,7 +14,7 @@ struct DownloadComponent {
  enum Action {
  case alert(PresentationAction<Alert>)
  case buttonTapped
- case downloadClient(Result<DownloadClient.Event, Error>)
+ case downloadClient(Result<DownloadClient.Event, any Error>)
 
  @CasePathable
  enum Alert {

Examples/CaseStudies/SwiftUICaseStudies/05-HigherOrderReducers-ReusableFavoriting.swift

@@ -28,7 +28,7 @@ struct FavoritingState<ID: Hashable & Sendable>: Equatable {
 enum FavoritingAction {
  case alert(PresentationAction<Alert>)
  case buttonTapped
- case response(Result<Bool, Error>)
+ case response(Result<Bool, any Error>)
 
  enum Alert: Equatable {}
 }

Examples/CaseStudies/SwiftUICaseStudiesTests/03-Effects-WebSocketTests.swift

@@ -6,7 +6,7 @@ import XCTest
 final class WebSocketTests: XCTestCase {
  func testWebSocketHappyPath() async {
  let actions = AsyncStream.makeStream(of: WebSocketClient.Action.self)
- let messages = AsyncStream.makeStream(of: Result<WebSocketClient.Message, Error>.self)
+ let messages = AsyncStream.makeStream(of: Result<WebSocketClient.Message, any Error>.self)
 
  let store = await TestStore(initialState: WebSocket.State()) {
  WebSocket()
@@ -57,7 +57,7 @@ final class WebSocketTests: XCTestCase {
 
  func testWebSocketSendFailure() async {
  let actions = AsyncStream.makeStream(of: WebSocketClient.Action.self)
- let messages = AsyncStream.makeStream(of: Result<WebSocketClient.Message, Error>.self)
+ let messages = AsyncStream.makeStream(of: Result<WebSocketClient.Message, any Error>.self)
 
  let store = await TestStore(initialState: WebSocket.State()) {
  WebSocket()

Examples/Search/Search/SearchView.swift

@@ -31,10 +31,10 @@ struct Search {
  }
 
  enum Action {
- case forecastResponse(GeocodingSearch.Result.ID, Result<Forecast, Error>)
+ case forecastResponse(GeocodingSearch.Result.ID, Result<Forecast, any Error>)
  case searchQueryChanged(String)
  case searchQueryChangeDebounced
- case searchResponse(Result<GeocodingSearch, Error>)
+ case searchResponse(Result<GeocodingSearch, any Error>)
  case searchResultTapped(GeocodingSearch.Result)
  }
 

Examples/SpeechRecognition/SpeechRecognition/SpeechClient/Live.swift

@@ -26,7 +26,7 @@ extension SpeechClient: DependencyKey {
 private actor Speech {
  var audioEngine: AVAudioEngine? = nil
  var recognitionTask: SFSpeechRecognitionTask? = nil
- var recognitionContinuation: AsyncThrowingStream<SpeechRecognitionResult, Error>.Continuation?
+ var recognitionContinuation: AsyncThrowingStream<SpeechRecognitionResult, any Error>.Continuation?
 
  func finishTask() {
  self.audioEngine?.stop()
@@ -37,7 +37,7 @@ private actor Speech {
 
  func startTask(
  request: UncheckedSendable<SFSpeechAudioBufferRecognitionRequest>
- ) -> AsyncThrowingStream<SpeechRecognitionResult, Error> {
+ ) -> AsyncThrowingStream<SpeechRecognitionResult, any Error> {
  let request = request.wrappedValue
 
  return AsyncThrowingStream { continuation in

Examples/SpeechRecognition/SpeechRecognition/SpeechRecognition.swift

@@ -20,7 +20,7 @@ struct SpeechRecognition {
  enum Action {
  case alert(PresentationAction<Alert>)
  case recordButtonTapped
- case speech(Result<String, Error>)
+ case speech(Result<String, any Error>)
  case speechRecognizerAuthorizationStatusResponse(SFSpeechRecognizerAuthorizationStatus)
 
  enum Alert: Equatable {}

Examples/SyncUps/SyncUps/Dependencies/SpeechRecognizer.swift

@@ -137,11 +137,11 @@ private actor Speech {
  private var audioEngine: AVAudioEngine? = nil
  private var recognitionTask: SFSpeechRecognitionTask? = nil
  private var recognitionContinuation:
- AsyncThrowingStream<SpeechRecognitionResult, Error>.Continuation?
+ AsyncThrowingStream<SpeechRecognitionResult, any Error>.Continuation?
 
  func startTask(
  request: SFSpeechAudioBufferRecognitionRequest
- ) -> AsyncThrowingStream<SpeechRecognitionResult, Error> {
+ ) -> AsyncThrowingStream<SpeechRecognitionResult, any Error> {
  AsyncThrowingStream { continuation in
  self.recognitionContinuation = continuation
  let audioSession = AVAudioSession.sharedInstance()

Examples/TicTacToe/tic-tac-toe/Sources/LoginCore/LoginCore.swift

@@ -19,7 +19,7 @@ public struct Login: Sendable {
 
  public enum Action: Sendable, ViewAction {
  case alert(PresentationAction<Alert>)
- case loginResponse(Result<AuthenticationResponse, Error>)
+ case loginResponse(Result<AuthenticationResponse, any Error>)
  case twoFactor(PresentationAction<TwoFactor.Action>)
  case view(View)
 

Examples/TicTacToe/tic-tac-toe/Sources/TwoFactorCore/TwoFactorCore.swift

@@ -20,7 +20,7 @@ public struct TwoFactor: Sendable {
 
  public enum Action: Sendable, ViewAction {
  case alert(PresentationAction<Alert>)
- case twoFactorResponse(Result<AuthenticationResponse, Error>)
+ case twoFactorResponse(Result<AuthenticationResponse, any Error>)
  case view(View)
 
  public enum Alert: Equatable, Sendable {}

Examples/VoiceMemos/VoiceMemos/AudioPlayerClient/LiveAudioPlayerClient.swift

@@ -3,7 +3,7 @@ import Dependencies
 
 extension AudioPlayerClient: DependencyKey {
  static let liveValue = Self { url in
- let stream = AsyncThrowingStream<Bool, Error> { continuation in
+ let stream = AsyncThrowingStream<Bool, any Error> { continuation in
  do {
  let delegate = try Delegate(
  url: url,
@@ -48,7 +48,7 @@ private final class Delegate: NSObject, AVAudioPlayerDelegate, Sendable {
  self.didFinishPlaying(flag)
  }
 
- func audioPlayerDecodeErrorDidOccur(_ player: AVAudioPlayer, error: Error?) {
+ func audioPlayerDecodeErrorDidOccur(_ player: AVAudioPlayer, error: (any Error)?) {
  self.decodeErrorDidOccur(error)
  }
 }

Examples/VoiceMemos/VoiceMemos/AudioRecorderClient/LiveAudioRecorderClient.swift

@@ -37,7 +37,7 @@ private actor AudioRecorder {
  func start(url: URL) async throws -> Bool {
  self.stop()
 
- let stream = AsyncThrowingStream<Bool, Error> { continuation in
+ let stream = AsyncThrowingStream<Bool, any Error> { continuation in
  do {
  self.delegate = Delegate(
  didFinishRecording: { flag in
@@ -83,11 +83,11 @@ private actor AudioRecorder {
 
 private final class Delegate: NSObject, AVAudioRecorderDelegate, Sendable {
  let didFinishRecording: @Sendable (Bool) -> Void
- let encodeErrorDidOccur: @Sendable (Error?) -> Void
+ let encodeErrorDidOccur: @Sendable ((any Error)?) -> Void
 
  init(
  didFinishRecording: @escaping @Sendable (Bool) -> Void,
- encodeErrorDidOccur: @escaping @Sendable (Error?) -> Void
+ encodeErrorDidOccur: @escaping @Sendable ((any Error)?) -> Void
  ) {
  self.didFinishRecording = didFinishRecording
  self.encodeErrorDidOccur = encodeErrorDidOccur
@@ -97,7 +97,7 @@ private final class Delegate: NSObject, AVAudioRecorderDelegate, Sendable {
  self.didFinishRecording(flag)
  }
 
- func audioRecorderEncodeErrorDidOccur(_ recorder: AVAudioRecorder, error: Error?) {
+ func audioRecorderEncodeErrorDidOccur(_ recorder: AVAudioRecorder, error: (any Error)?) {
  self.encodeErrorDidOccur(error)
  }
 }

Examples/VoiceMemos/VoiceMemos/RecordingMemo.swift

@@ -17,7 +17,7 @@ struct RecordingMemo {
  }
 
  enum Action: Sendable {
- case audioRecorderDidFinish(Result<Bool, Error>)
+ case audioRecorderDidFinish(Result<Bool, any Error>)
  case delegate(Delegate)
  case finalRecordingTime(TimeInterval)
  case onTask
@@ -26,7 +26,7 @@ struct RecordingMemo {
 
  @CasePathable
  enum Delegate: Sendable {
- case didFinish(Result<State, Error>)
+ case didFinish(Result<State, any Error>)
  }
  }
 

Examples/VoiceMemos/VoiceMemos/VoiceMemo.swift

@@ -22,7 +22,7 @@ struct VoiceMemo {
  }
 
  enum Action {
- case audioPlayerClient(Result<Bool, Error>)
+ case audioPlayerClient(Result<Bool, any Error>)
  case delegate(Delegate)
  case playButtonTapped
  case timerUpdated(TimeInterval)

Package.swift

@@ -91,6 +91,7 @@ let package = Package(
  target.swiftSettings = target.swiftSettings ?? []
  target.swiftSettings?.append(contentsOf: [
  .enableExperimentalFeature("StrictConcurrency"),
+ .enableUpcomingFeature("ExistentialAny"),
  .enableUpcomingFeature("InferSendableFromCaptures"),
  ])
  }

Package@swift-6.0.swift

@@ -87,8 +87,14 @@ let package = Package(
  swiftLanguageModes: [.v6]
 )
 
-for target in package.targets where target.type == .system || target.type == .test {
+for target in package.targets {
  target.swiftSettings = target.swiftSettings ?? []
+ target.swiftSettings?.append(contentsOf: [
+ .enableUpcomingFeature("ExistentialAny"),
+ ])
+}
+
+for target in package.targets where target.type == .system || target.type == .test {
  target.swiftSettings?.append(contentsOf: [
  .swiftLanguageMode(.v5),
  .enableExperimentalFeature("StrictConcurrency"),

Sources/ComposableArchitecture/Effect.swift

@@ -83,7 +83,7 @@ extension Effect {
  public static func run(
  priority: TaskPriority? = nil,
  operation: @escaping @Sendable (_ send: Send<Action>) async throws -> Void,
- catch handler: (@Sendable (_ error: Error, _ send: Send<Action>) async -> Void)? = nil,
+ catch handler: (@Sendable (_ error: any Error, _ send: Send<Action>) async -> Void)? = nil,
  fileID: StaticString = #fileID,
  filePath: StaticString = #filePath,
  line: UInt = #line,

Sources/ComposableArchitecture/Effects/Animation.swift

@@ -83,7 +83,7 @@ private struct TransactionPublisher<Upstream: Publisher>: Publisher {
  self.transaction = transaction
  }
 
- func receive(subscription: Subscription) {
+ func receive(subscription: any Subscription) {
  self.downstream.receive(subscription: subscription)
  }
 

Sources/ComposableArchitecture/Effects/Cancellation.swift

@@ -172,7 +172,7 @@ extension Effect {
  ) async rethrows -> T {
  @Dependency(\.navigationIDPath) var navigationIDPath
 
- let (cancellable, task): (AnyCancellable, Task<T, Error>) =
+ let (cancellable, task): (AnyCancellable, Task<T, any Error>) =
  _cancellationCancellables
  .withValue {
  if cancelInFlight {
@@ -191,7 +191,7 @@ extension Effect {
  do {
  return try await task.cancellableValue
  } catch {
- return try Result<T, Error>.failure(error)._rethrowGet()
+ return try Result<T, any Error>.failure(error)._rethrowGet()
  }
  }
 #else
@@ -203,7 +203,7 @@ extension Effect {
  ) async rethrows -> T {
  @Dependency(\.navigationIDPath) var navigationIDPath
 
- let (cancellable, task): (AnyCancellable, Task<T, Error>) =
+ let (cancellable, task): (AnyCancellable, Task<T, any Error>) =
  _cancellationCancellables
  .withValue {
  if cancelInFlight {
@@ -222,7 +222,7 @@ extension Effect {
  do {
  return try await task.cancellableValue
  } catch {
- return try Result<T, Error>.failure(error)._rethrowGet()
+ return try Result<T, any Error>.failure(error)._rethrowGet()
  }
  }
 #endif

Sources/ComposableArchitecture/Effects/TaskResult.swift

@@ -4,7 +4,7 @@
 ///
 /// This type is needed because Swift's concurrency tools can only express untyped errors, such as
 /// `async` functions and `AsyncSequence`, and so their output can realistically only be bridged to
-/// `Result<_, Error>`. However, `Result<_, Error>` is never `Equatable` since `Error` is not
+/// `Result<_, any Error>`. However, `Result<_, any Error>` is never `Equatable` since `Error` is not
 /// `Equatable`, and equatability is very important for testing in the Composable Architecture. By
 /// defining our own type we get the ability to recover equatability in most situations.
 ///
@@ -129,7 +129,7 @@ public enum TaskResult<Success: Sendable>: Sendable {
  case success(Success)
 
  /// A failure, storing an error.
- case failure(Error)
+ case failure(any Error)
 
  /// Creates a new task result by evaluating an async throwing closure, capturing the returned
  /// value as a success, or any thrown error as a failure.
@@ -226,7 +226,7 @@ extension TaskResult: CasePathable {
  )
  }
 
- public var failure: AnyCasePath<TaskResult, Error> {
+ public var failure: AnyCasePath<TaskResult, any Error> {
  AnyCasePath(
  embed: { .failure($0) },
  extract: {
@@ -238,7 +238,7 @@ extension TaskResult: CasePathable {
  }
 }
 
-extension Result where Success: Sendable, Failure == Error {
+extension Result where Success: Sendable, Failure == any Error {
  /// Transforms a `TaskResult` into a `Result`.
  ///
  /// - Parameter result: A task result.