Use fetch_update instead of open-coding the compare-exchange loop.

src/lib.rs

@@ -122,21 +122,12 @@ where
             last_next = unsafe { &mut (**last_next).next };
         }
 
-        let mut old_top = self.0.load(Ordering::Relaxed);
-
-        loop {
-            *last_next = old_top;
-
-            match self.0.compare_exchange_weak(
-                old_top,
-                new_top,
-                Ordering::AcqRel,
-                Ordering::Relaxed,
-            ) {
-                Ok(_) => break,
-                Err(top) => old_top = top,
-            }
-        }
+        self.0
+            .fetch_update(Ordering::AcqRel, Ordering::Relaxed, |old_top| {
+                *last_next = old_top;
+                Some(new_top)
+            })
+            .unwrap();
     }
 
     /// Collect the values into an iterator