Mark UnownedSerialExecutor as @unsafe

DougGregor · DougGregor · commit 9e095135146d · 2024-12-20T07:35:35.000-08:00
diff --git a/stdlib/public/Concurrency/Executor.swift b/stdlib/public/Concurrency/Executor.swift
@@ -317,6 +317,7 @@ extension SerialExecutor {
 /// different objects, the executor must be referenced strongly by the
 /// actor.
 @available(SwiftStdlib 5.1, *)
+@unsafe
 @frozen
 public struct UnownedSerialExecutor: Sendable {
   @usableFromInline
