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swhitty · swhitty · commit f25eeb135e8e · 2025-06-02T15:33:31.000+10:00
diff --git a/Sources/Mutex.swift b/Sources/Mutex.swift
@@ -35,7 +35,7 @@
 // Backports the Synchronization.Mutex API for earlier Darwin platforms
 
 @usableFromInline
-struct Mutex<Value>: @unchecked Sendable {
+struct Mutex<Value>: @unchecked Sendable, ~Copyable {
     let storage: Storage
 
     @usableFromInline
