need to pick a new feature name

RalfJung · RalfJung · commit 23522f6cabf9 · 2017-04-29T19:15:59.000+02:00
diff --git a/src/libstd/sync/mutex.rs b/src/libstd/sync/mutex.rs
@@ -153,7 +153,7 @@ pub struct MutexGuard<'a, T: ?Sized + 'a> {
 
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<'a, T: ?Sized> !Send for MutexGuard<'a, T> { }
-#[stable(feature = "rust1", since = "1.18.0")]
+#[stable(feature = "mutexguard", since = "1.18.0")]
 unsafe impl<'a, T: ?Sized + Sync> Sync for MutexGuard<'a, T> { }
 
 impl<T> Mutex<T> {
