Fix CI

Author: FranzBusch

.github/workflows/pull_request.yml

@@ -13,3 +13,4 @@ jobs:
     uses: swiftlang/github-workflows/.github/workflows/soundness.yml@main
     with:
       license_header_check_project_name: "Swift Async Algorithms"
+      format_check_container_image: "swift:6.0.3-noble"

Sources/Example/Example.swift

@@ -1,3 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift Async Algorithms open source project
+//
+// Copyright (c) 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+//
+//===----------------------------------------------------------------------===//
+
+#if compiler(>=6.0)
 import AsyncAlgorithms
 
 @available(macOS 15.0, *)
@@ -65,3 +77,6 @@ struct Example {
     }
   }
 }
+#else
+fatalError("Example only supports Swift 6.0 and above")
+#endif

Tests/AsyncAlgorithmsTests/Support/ManualExecutor.swift

@@ -1,3 +1,14 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift Async Algorithms open source project
+//
+// Copyright (c) 2025 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+//
+//===----------------------------------------------------------------------===//
+
 import DequeModule
 import Synchronization