clean up layout dir

src/util/refcount.rs

@@ -10,6 +10,7 @@ impl RefCounter {
     pub fn new() -> Self {
         Self(Arc::new(0.into()))
     }
+    #[allow(unused)]
     pub fn refs(&self) -> u32 {
         self.0.load(Ordering::Acquire)
     }
@@ -17,6 +18,7 @@ impl RefCounter {
         let refs = self.0.fetch_sub(1, Ordering::Release);
         refs == 0
     }
+    #[allow(unused)]
     pub fn quiet_clone(&self) -> Self {
         Self(self.0.clone())
     }