--- old/src/java.base/share/classes/java/util/concurrent/atomic/LongAccumulator.java	2019-10-14 17:27:01.262013899 -0700
+++ new/src/java.base/share/classes/java/util/concurrent/atomic/LongAccumulator.java	2019-10-14 17:27:01.074013899 -0700
@@ -82,6 +82,7 @@
 public class LongAccumulator extends Striped64 implements Serializable {
     private static final long serialVersionUID = 7249069246863182397L;
 
+    @SuppressWarnings("serial") // Not statically typed as Serializable
     private final LongBinaryOperator function;
     private final long identity;
 
@@ -239,6 +240,7 @@
          * The function used for updates.
          * @serial
          */
+        @SuppressWarnings("serial") // Not statically typed as Serializable
         private final LongBinaryOperator function;
 
         /**