Enabled ExistentialAny setting

Package.swift

@@ -53,3 +53,10 @@ let package = Package(
         )
     ]
 )
+
+for target in package.targets {
+    target.swiftSettings = (target.swiftSettings ?? []) + [
+        .swiftLanguageMode(.v6),
+        .enableUpcomingFeature("ExistentialAny")
+    ]
+}

Sources/PrincipleConcurrency/TaskTimeLimit.swift

@@ -13,14 +13,14 @@ private enum TaskTimeLimit {
 
     enum Event<Success: Sendable> {
 
-        case taskFinished(Result<Success, Error>)
+        case taskFinished(Result<Success, any Error>)
         case parentTaskCancelled
         case timeLimitExceeded
     }
 }
 
 internal func withTimeLimit<C: Clock, Success: Sendable>( // swiftlint:disable:this function_parameter_count
-    throwing timeLimitExceededError: @autoclosure () -> Error,
+    throwing timeLimitExceededError: @autoclosure () -> any Error,
     after deadline: C.Instant,
     tolerance: C.Instant.Duration?,
     clock: C,
@@ -32,13 +32,15 @@ internal func withTimeLimit<C: Clock, Success: Sendable>( // swiftlint:disable:t
 
     let result = await withTaskGroup(
         of: TaskTimeLimit.Event<Success>.self,
-        returning: Result<Success, Error>.self,
+        returning: Result<Success, any Error>.self,
         isolation: isolation,
         body: { group in
             var transfer = transfer.take()
 
             group.addTask(priority: priority) {
                 do {
+                    // Review after closure isolation control gets implemented
+                    // https://forums.swift.org/t/closure-isolation-control/70378
                     let success = try await transfer.finalize()()
                     return .taskFinished(.success(success))
                 } catch {