Swift Language Support: Drop <5.9 (#3185)

* Swift Language Support: Drop <5.9

* wip

* wip

* wip

* wip

* wip

.github/workflows/ci.yml

@@ -24,54 +24,54 @@ jobs:
           - release
     steps:
       - uses: actions/checkout@v4
-      - name: Select Xcode 15.2
-        run: sudo xcode-select -s /Applications/Xcode_15.2.app
+      - name: Select Xcode 15.4
+        run: sudo xcode-select -s /Applications/Xcode_15.4.app
       - name: Build ${{ matrix.config }}
         run: make CONFIG=${{ matrix.config }} build-all-platforms
       - name: Run ${{ matrix.config }} tests
         run: make CONFIG=${{ matrix.config }} test-library
 
   library-evolution:
     name: Library (evolution)
-    runs-on: macos-13
+    runs-on: macos-14
     steps:
       - uses: actions/checkout@v4
-      - name: Select Xcode 15.2
-        run: sudo xcode-select -s /Applications/Xcode_15.2.app
+      - name: Select Xcode 15.4
+        run: sudo xcode-select -s /Applications/Xcode_15.4.app
       - name: Build for library evolution
         run: make build-for-library-evolution
 
   library-compatibility:
-    name: Library (Swift 5.7.1)
-    runs-on: macos-12
+    name: Library (Swift 5.9)
+    runs-on: macos-14
     strategy:
       matrix:
         config:
           - debug
           - release
     steps:
       - uses: actions/checkout@v4
-      - name: Select Xcode 14.1
-        run: sudo xcode-select -s /Applications/Xcode_14.1.app
+      - name: Select Xcode 15.2
+        run: sudo xcode-select -s /Applications/Xcode_15.2.app
       - name: Build ${{ matrix.config }}
         run: swift build -c ${{ matrix.config }}
 
   benchmarks:
     name: Benchmarks
-    runs-on: macos-13
+    runs-on: macos-14
     steps:
       - uses: actions/checkout@v4
-      - name: Select Xcode 15.2
-        run: sudo xcode-select -s /Applications/Xcode_15.2.app
+      - name: Select Xcode 15.4
+        run: sudo xcode-select -s /Applications/Xcode_15.4.app
       - name: Run benchmark
         run: make benchmark
 
   examples:
     name: Examples
-    runs-on: macos-13
+    runs-on: macos-14
     steps:
       - uses: actions/checkout@v4
-      - name: Select Xcode 15.2
-        run: sudo xcode-select -s /Applications/Xcode_15.2.app
+      - name: Select Xcode 15.4
+        run: sudo xcode-select -s /Applications/Xcode_15.4.app
       - name: Run tests
         run: make test-examples

Examples/CaseStudies/SwiftUICaseStudies/05-HigherOrderReducers-ResuableOfflineDownloads/ReusableComponents-Download.swift

@@ -21,20 +21,20 @@ struct CityMap {
     var downloadAlert: AlertState<DownloadComponent.Action.Alert>?
     var downloadMode: Mode
 
-    var id: UUID { self.download.id }
+    var id: UUID { download.id }
 
     var downloadComponent: DownloadComponent.State {
       get {
         DownloadComponent.State(
-          alert: self.downloadAlert,
-          id: self.download.id,
-          mode: self.downloadMode,
-          url: self.download.downloadVideoUrl
+          alert: downloadAlert,
+          id: download.id,
+          mode: downloadMode,
+          url: download.downloadVideoUrl
         )
       }
       set {
-        self.downloadAlert = newValue.alert
-        self.downloadMode = newValue.mode
+        downloadAlert = newValue.alert
+        downloadMode = newValue.mode
       }
     }
 
@@ -80,10 +80,10 @@ struct CityMapRowView: View {
   let store: StoreOf<CityMap>
 
   var body: some View {
-    WithViewStore(self.store, observe: { $0 }) { viewStore in
+    WithViewStore(store, observe: { $0 }) { viewStore in
       HStack {
         NavigationLink(
-          destination: CityMapDetailView(store: self.store)
+          destination: CityMapDetailView(store: store)
         ) {
           HStack {
             Image(systemName: "map")
@@ -94,7 +94,7 @@ struct CityMapRowView: View {
           Spacer()
 
           DownloadComponentView(
-            store: self.store.scope(state: \.downloadComponent, action: \.downloadComponent)
+            store: store.scope(state: \.downloadComponent, action: \.downloadComponent)
           )
           .padding(.trailing, 8)
         }
@@ -107,7 +107,7 @@ struct CityMapDetailView: View {
   let store: StoreOf<CityMap>
 
   var body: some View {
-    WithViewStore(self.store, observe: { $0 }) { viewStore in
+    WithViewStore(store, observe: { $0 }) { viewStore in
       VStack(spacing: 32) {
         Text(viewStore.download.blurb)
 
@@ -123,7 +123,7 @@ struct CityMapDetailView: View {
           Spacer()
 
           DownloadComponentView(
-            store: self.store.scope(state: \.downloadComponent, action: \.downloadComponent)
+            store: store.scope(state: \.downloadComponent, action: \.downloadComponent)
           )
         }
 
@@ -160,7 +160,7 @@ struct CitiesView: View {
       Section {
         AboutView(readMe: readMe)
       }
-      ForEachStore(self.store.scope(state: \.cityMaps, action: \.cityMaps)) { cityMapStore in
+      ForEachStore(store.scope(state: \.cityMaps, action: \.cityMaps)) { cityMapStore in
         CityMapRowView(store: cityMapStore)
           .buttonStyle(.borderless)
       }

Examples/Integration/IntegrationUITests/Internal/BaseIntegrationTests.swift

@@ -91,7 +91,7 @@ enum LogConfiguration {
   case unordered
 }
 
-extension Snapshotting where Value == String, Format == String {
+extension Snapshotting<String, String> {
   fileprivate static nonisolated(unsafe) let _lines = Snapshotting(
     pathExtension: "txt",
     diffing: Diffing(

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

@@ -82,7 +82,7 @@ public enum Player: Equatable, Sendable {
   }
 }
 
-extension Three where Element == Three<Player?> {
+extension Three<Three<Player?>> {
   public static let empty = Self(
     .init(nil, nil, nil),
     .init(nil, nil, nil),

Examples/Todos/Todos/Todos.swift

@@ -140,7 +140,7 @@ struct AppView: View {
   }
 }
 
-extension IdentifiedArray where ID == Todo.State.ID, Element == Todo.State {
+extension IdentifiedArrayOf<Todo.State> {
   static let mock: Self = [
     Todo.State(
       description: "Check Mail",

Makefile

@@ -1,10 +1,10 @@
 CONFIG = debug
-PLATFORM_IOS = iOS Simulator,id=$(call udid_for,iOS 17.2,iPhone \d\+ Pro [^M])
+PLATFORM_IOS = iOS Simulator,id=$(call udid_for,iOS 17.5,iPhone \d\+ Pro [^M])
 PLATFORM_MACOS = macOS
 PLATFORM_MAC_CATALYST = macOS,variant=Mac Catalyst
-PLATFORM_TVOS = tvOS Simulator,id=$(call udid_for,tvOS 17.2,TV)
-PLATFORM_VISIONOS = visionOS Simulator,id=$(call udid_for,visionOS 1.0,Vision)
-PLATFORM_WATCHOS = watchOS Simulator,id=$(call udid_for,watchOS 10.2,Watch)
+PLATFORM_TVOS = tvOS Simulator,id=$(call udid_for,tvOS 17.5,TV)
+PLATFORM_VISIONOS = visionOS Simulator,id=$(call udid_for,visionOS 1.2,Vision)
+PLATFORM_WATCHOS = watchOS Simulator,id=$(call udid_for,watchOS 10.5,Watch)
 
 default: test-all
 

Sources/ComposableArchitecture/Effect.swift

@@ -232,7 +232,7 @@ extension Effect {
   /// - Parameter effects: A sequence of effects.
   /// - Returns: A new effect
   @inlinable
-  public static func merge<S: Sequence>(_ effects: S) -> Self where S.Element == Self {
+  public static func merge(_ effects: some Sequence<Self>) -> Self {
     effects.reduce(.none) { $0.merge(with: $1) }
   }
 
@@ -289,7 +289,7 @@ extension Effect {
   /// - Parameter effects: A collection of effects.
   /// - Returns: A new effect
   @inlinable
-  public static func concatenate<C: Collection>(_ effects: C) -> Self where C.Element == Self {
+  public static func concatenate(_ effects: some Collection<Self>) -> Self {
     effects.reduce(.none) { $0.concatenate(with: $1) }
   }
 

Sources/ComposableArchitecture/Effects/Animation.swift

@@ -66,8 +66,7 @@ private struct TransactionPublisher<Upstream: Publisher>: Publisher {
   var upstream: Upstream
   var transaction: Transaction
 
-  func receive<S: Combine.Subscriber>(subscriber: S)
-  where S.Input == Output, S.Failure == Failure {
+  func receive(subscriber: some Combine.Subscriber<Upstream.Output, Upstream.Failure>) {
     let conduit = Subscriber(downstream: subscriber, transaction: self.transaction)
     self.upstream.receive(subscriber: conduit)
   }

Sources/ComposableArchitecture/Effects/Cancellation.swift

@@ -190,7 +190,7 @@ public func withTaskCancellation<ID: Hashable, T: Sendable>(
   }
 }
 
-extension Task where Success == Never, Failure == Never {
+extension Task<Never, Never> {
   /// Cancel any currently in-flight operation with the given identifier.
   ///
   /// - Parameter id: An identifier.

Sources/ComposableArchitecture/Effects/Publisher.swift

@@ -5,13 +5,8 @@ extension Effect {
   ///
   /// - Parameter createPublisher: The closure to execute when the effect is performed.
   /// - Returns: An effect wrapping a Combine publisher.
-  public static func publisher<P: Publisher>(_ createPublisher: () -> P) -> Self
-  where P.Output == Action, P.Failure == Never {
-    Self(
-      operation: .publisher(
-        createPublisher().eraseToAnyPublisher()
-      )
-    )
+  public static func publisher(_ createPublisher: () -> some Publisher<Action, Never>) -> Self {
+    Self(operation: .publisher(createPublisher().eraseToAnyPublisher()))
   }
 }
 
@@ -25,14 +20,12 @@ public struct _EffectPublisher<Action>: Publisher {
     self.effect = effect
   }
 
-  public func receive<S: Combine.Subscriber>(
-    subscriber: S
-  ) where S.Input == Action, S.Failure == Failure {
-    self.publisher.subscribe(subscriber)
+  public func receive(subscriber: some Combine.Subscriber<Action, Failure>) {
+    publisher.subscribe(subscriber)
   }
 
   private var publisher: AnyPublisher<Action, Failure> {
-    switch self.effect.operation {
+    switch effect.operation {
     case .none:
       return Empty().eraseToAnyPublisher()
     case let .publisher(publisher):

Sources/ComposableArchitecture/Internal/CurrentValueRelay.swift

@@ -16,7 +16,7 @@ final class CurrentValueRelay<Output>: Publisher {
     self.currentValue = value
   }
 
-  func receive<S: Subscriber>(subscriber: S) where S.Input == Output, S.Failure == Never {
+  func receive(subscriber: some Subscriber<Output, Never>) {
     let subscription = Subscription(downstream: AnySubscriber(subscriber))
     self.subscriptions.append(subscription)
     subscriber.receive(subscription: subscription)
@@ -32,8 +32,7 @@ final class CurrentValueRelay<Output>: Publisher {
 }
 
 extension CurrentValueRelay {
-  final class Subscription<Downstream: Subscriber>: Combine.Subscription
-  where Downstream.Input == Output, Downstream.Failure == Failure {
+  final class Subscription<Downstream: Subscriber<Output, Failure>>: Combine.Subscription {
     private var demandBuffer: DemandBuffer<Downstream>?
 
     init(downstream: Downstream) {

Sources/ComposableArchitecture/Internal/EphemeralState.swift

@@ -1,37 +1,25 @@
 @_spi(Reflection) import CasePaths
 
-#if swift(>=5.8)
-  /// Loosely represents features that are only briefly shown and the first time they are interacted
-  /// with they are dismissed. Such features do not manage any behavior on the inside.
-  ///
-  /// Alerts and confirmation dialogs are examples of this kind of state.
-  @_documentation(visibility:public)
-  public protocol _EphemeralState<Action> {
-    associatedtype Action
-    static var actionType: Any.Type { get }
-  }
-#else
-  public protocol _EphemeralState<Action> {
-    associatedtype Action
-    static var actionType: Any.Type { get }
-  }
-#endif
+/// Loosely represents features that are only briefly shown and the first time they are interacted
+/// with they are dismissed. Such features do not manage any behavior on the inside.
+///
+/// Alerts and confirmation dialogs are examples of this kind of state.
+@_documentation(visibility:public)
+public protocol _EphemeralState<Action> {
+  associatedtype Action
+  static var actionType: Any.Type { get }
+}
 
 extension _EphemeralState {
   public static var actionType: Any.Type { Action.self }
 }
 
-#if swift(>=5.8)
-  @_documentation(visibility:private)
-  extension AlertState: _EphemeralState {}
-  @_documentation(visibility:private)
-  @available(iOS 13, macOS 12, tvOS 13, watchOS 6, *)
-  extension ConfirmationDialogState: _EphemeralState {}
-#else
-  extension AlertState: _EphemeralState {}
-  @available(iOS 13, macOS 12, tvOS 13, watchOS 6, *)
-  extension ConfirmationDialogState: _EphemeralState {}
-#endif
+@_documentation(visibility:private)
+extension AlertState: _EphemeralState {}
+
+@_documentation(visibility:private)
+@available(iOS 13, macOS 12, tvOS 13, watchOS 6, *)
+extension ConfirmationDialogState: _EphemeralState {}
 
 @usableFromInline
 func ephemeralType<State>(of state: State) -> (any _EphemeralState.Type)? {

Sources/ComposableArchitecture/Internal/Locking.swift

@@ -1,6 +1,6 @@
 import Foundation
 
-extension UnsafeMutablePointer where Pointee == os_unfair_lock_s {
+extension UnsafeMutablePointer<os_unfair_lock_s> {
   @inlinable @discardableResult
   func sync<R>(_ work: () -> R) -> R {
     os_unfair_lock_lock(self)

Sources/ComposableArchitecture/Internal/RuntimeWarnings.swift

@@ -1,14 +1,10 @@
 import Foundation
 
 extension Notification.Name {
-  #if swift(>=5.8)
-    @_documentation(visibility:private)
-    @available(*, deprecated, renamed: "_runtimeWarning")
-    public static let runtimeWarning = Self("ComposableArchitecture.runtimeWarning")
-  #else
-    @available(*, deprecated, renamed: "_runtimeWarning")
-    public static let runtimeWarning = Self("ComposableArchitecture.runtimeWarning")
-  #endif
+  @_documentation(visibility:private)
+  @available(*, deprecated, renamed: "_runtimeWarning")
+  public static let runtimeWarning = Self("ComposableArchitecture.runtimeWarning")
+
   /// A notification that is posted when a runtime warning is emitted.
   public static let _runtimeWarning = Self("ComposableArchitecture.runtimeWarning")
 }