Remove unnecessary allow(unused) attribute.

nnethercote · nnethercote · commit 197031114687 · 2025-02-28T17:31:31.000+11:00
diff --git a/compiler/rustc_transmute/src/lib.rs b/compiler/rustc_transmute/src/lib.rs
@@ -104,7 +104,6 @@ mod rustc {
             Self { tcx }
         }
 
-        #[allow(unused)]
         pub fn is_transmutable(
             &mut self,
             cause: ObligationCause<'tcx>,
