[stdlib] Adopt @_inheritActorContext(always) on Task.immediate

This change aligns implementation with the current SE-0472 proposal.

(cherry picked from commit c3c1b4f)
(cherry picked from commit 8c05636)
(cherry picked from commit 0598b8c)

Author: xedin

stdlib/public/Concurrency/Task+immediate.swift.gyb

@@ -38,9 +38,9 @@ extension Task where Failure == ${FAILURE_TYPE} {
   public static func startSynchronously(
     name: String? = nil,
     priority: TaskPriority? = nil,
-    @_implicitSelfCapture _ operation: __owned @isolated(any) @escaping () async throws -> Success
+    @_implicitSelfCapture @_inheritActorContext(always) _ operation: sending @isolated(any) @escaping () async throws -> Success
   ) -> Task<Success, ${FAILURE_TYPE}> {
-    immediate(name: name, priority: priority, operation)
+    immediate(name: name, priority: priority, operation: operation)
   }
 
   /// Create and immediately start running a new task in the context of the calling thread/task.
@@ -66,13 +66,14 @@ extension Task where Failure == ${FAILURE_TYPE} {
   ///   - operation: the operation to be run immediately upon entering the task.
   /// - Returns: A reference to the unstructured task which may be awaited on.
   @available(SwiftStdlib 6.2, *)
+  @_alwaysEmitIntoClient
   @discardableResult
   public static func immediate(
     name: String? = nil,
     priority: TaskPriority? = nil,
     % # NOTE: This closure cannot be 'sending' because we'll trigger ' pattern that the region based isolation checker does not understand how to check'
     % #       In this case: `func syncOnMyGlobalActor() { Task.immediate { @MyGlobalActor in } }`
-    @_implicitSelfCapture _ operation: __owned @isolated(any) @escaping () async throws -> Success
+    @_implicitSelfCapture @_inheritActorContext(always) operation: sending @isolated(any) @escaping () async throws -> Success
   ) -> Task<Success, ${FAILURE_TYPE}> {
 
     let builtinSerialExecutor =
@@ -188,6 +189,7 @@ extension ${GROUP_TYPE} {
   /// is semantically equivalent to its basic version which can be
   /// created using ``${GROUP_TYPE}/addTask``.
   @available(SwiftStdlib 6.2, *)
+  @_alwaysEmitIntoClient
   public func ${METHOD_NAME}( // in ${GROUP_TYPE}
     name: String? = nil,
     priority: TaskPriority? = nil,
@@ -275,5 +277,7 @@ extension Task where Failure == ${FAILURE_TYPE} {
 @_silgen_name("swift_task_startOnMainActor")
 internal func _startTaskOnMainActor(_ task: Builtin.NativeObject)
 
+@available(SwiftStdlib 6.2, *)
 @_silgen_name("swift_task_immediate")
+@usableFromInline
 internal func _startTaskImmediately(_ task: Builtin.NativeObject, targetExecutor: Builtin.Executor?)

test/Concurrency/Runtime/startImmediately.swift

@@ -1,6 +1,3 @@
-// FIXME: Marking this disabled since we're reworking the semantics and the test is a bit racy until we do
-// REQUIRES: rdar149506152
-
 // RUN: %empty-directory(%t)
 // RUN: %target-build-swift -Xfrontend -disable-availability-checking %s %import-libdispatch -swift-version 6 -o %t/a.out
 // RUN: %target-codesign %t/a.out

test/Concurrency/startImmediatelyIsolation.swift

@@ -38,3 +38,14 @@ func async() async throws {
     group.addImmediateTaskUnlessCancelled { () async throws -> Void in }
   }
 }
+
+@available(SwiftStdlib 6.2, *)
+actor TestSelfCapture {
+    func method() {}
+
+    func test() {
+        Task.immediate {
+            method() // Ok due to `@_implicitSelfCapture`
+        }
+    }
+}

test/abi/macOS/arm64/concurrency.swift

@@ -393,16 +393,6 @@ Added: _swift_task_getCurrentTaskName
 Added: _swift_task_immediate
 Added: _$sScTss5Error_pRs_rlE18startSynchronously4name8priority_ScTyxsAA_pGSSSg_ScPSgxyYaKYAcntFZ
 Added: _$sScTss5NeverORs_rlE18startSynchronously4name8priority_ScTyxABGSSSg_ScPSgxyYaKYAcntFZ
-Added: _$sScG16addImmediateTask4name8priority9operationySSSg_ScPSgxyYaYAcntF
-Added: _$sScg31addImmediateTaskUnlessCancelled4name8priority9operationySSSg_ScPSgxyYaKYAcntF
-Added: _$sScG31addImmediateTaskUnlessCancelled4name8priority9operationySSSg_ScPSgxyYaYAcntF
-Added: _$sScTss5NeverORs_rlE9immediate4name8priority_ScTyxABGSSSg_ScPSgxyYaKYAcntFZ
-Added: _$sScTss5Error_pRs_rlE9immediate4name8priority_ScTyxsAA_pGSSSg_ScPSgxyYaKYAcntFZ
-Added: _$sScg16addImmediateTask4name8priority9operationySSSg_ScPSgxyYaKYAcntF
-Added: _$ss19DiscardingTaskGroupV012addImmediateB04name8priority9operationySSSg_ScPSgyyYaYAcntF
-Added: _$ss19DiscardingTaskGroupV012addImmediateB15UnlessCancelled4name8priority9operationySSSg_ScPSgyyYaYAcntF
-Added: _$ss27ThrowingDiscardingTaskGroupV012addImmediateC04name8priority9operationySSSg_ScPSgyyYaKYAcntF
-Added: _$ss27ThrowingDiscardingTaskGroupV012addImmediateC15UnlessCancelled4name8priority9operationySSSg_ScPSgyyYaKYAcntF
 
 // isIsolatingCurrentContext
 Added: _swift_task_invokeSwiftIsIsolatingCurrentContext

test/abi/macOS/x86_64/concurrency.swift

@@ -393,16 +393,6 @@ Added: _swift_task_getCurrentTaskName
 Added: _swift_task_immediate
 Added: _$sScTss5Error_pRs_rlE18startSynchronously4name8priority_ScTyxsAA_pGSSSg_ScPSgxyYaKYAcntFZ
 Added: _$sScTss5NeverORs_rlE18startSynchronously4name8priority_ScTyxABGSSSg_ScPSgxyYaKYAcntFZ
-Added: _$sScG16addImmediateTask4name8priority9operationySSSg_ScPSgxyYaYAcntF
-Added: _$sScg31addImmediateTaskUnlessCancelled4name8priority9operationySSSg_ScPSgxyYaKYAcntF
-Added: _$sScG31addImmediateTaskUnlessCancelled4name8priority9operationySSSg_ScPSgxyYaYAcntF
-Added: _$sScTss5NeverORs_rlE9immediate4name8priority_ScTyxABGSSSg_ScPSgxyYaKYAcntFZ
-Added: _$sScTss5Error_pRs_rlE9immediate4name8priority_ScTyxsAA_pGSSSg_ScPSgxyYaKYAcntFZ
-Added: _$sScg16addImmediateTask4name8priority9operationySSSg_ScPSgxyYaKYAcntF
-Added: _$ss19DiscardingTaskGroupV012addImmediateB04name8priority9operationySSSg_ScPSgyyYaYAcntF
-Added: _$ss19DiscardingTaskGroupV012addImmediateB15UnlessCancelled4name8priority9operationySSSg_ScPSgyyYaYAcntF
-Added: _$ss27ThrowingDiscardingTaskGroupV012addImmediateC04name8priority9operationySSSg_ScPSgyyYaKYAcntF
-Added: _$ss27ThrowingDiscardingTaskGroupV012addImmediateC15UnlessCancelled4name8priority9operationySSSg_ScPSgyyYaKYAcntF
 
 // isIsolatingCurrentContext
 Added: _swift_task_invokeSwiftIsIsolatingCurrentContext