src/java.base/share/classes/java/util/Optional.java

@@ -56,10 +56,11 @@
   * instance.
   *
   * @param <T> the type of value
   * @since 1.8
   */
+ @jdk.internal.MigratedValueClass
  @jdk.internal.ValueBased
  public final class Optional<T> {
      /**
       * Common instance for {@code empty()}.
       */