Remove now unused SyncUnsafeCell diagnostic item

Urgau · Urgau · commit c547b45c361a · 2024-11-21T07:52:42.000+01:00
diff --git a/compiler/rustc_span/src/symbol.rs b/compiler/rustc_span/src/symbol.rs
@@ -316,7 +316,6 @@ symbols! {
         SubdiagMessage,
         Subdiagnostic,
         Sync,
-        SyncUnsafeCell,
         T,
         Target,
         ToOwned,
diff --git a/library/core/src/cell.rs b/library/core/src/cell.rs
@@ -2274,7 +2274,6 @@ impl<T: DispatchFromDyn<U>, U> DispatchFromDyn<UnsafeCell<U>> for UnsafeCell<T>
 /// See [`UnsafeCell`] for details.
 #[unstable(feature = "sync_unsafe_cell", issue = "95439")]
 #[repr(transparent)]
-#[rustc_diagnostic_item = "SyncUnsafeCell"]
 #[rustc_pub_transparent]
 pub struct SyncUnsafeCell<T: ?Sized> {
     value: UnsafeCell<T>,
