From e8a73b80523fe5cbf0ba1d074584693fd3e69cee Mon Sep 17 00:00:00 2001
From: Seth Tisue <seth@tisue.net>
Date: Fri, 13 May 2022 10:39:39 +0100
Subject: [PATCH] keep serialization stability on Scala 2.13.9

fixes scala/scala-dev#809
---
 core/src/main/scala/scala/collection/immutable/OldHashMap.scala | 1 +
 1 file changed, 1 insertion(+)

diff --git a/core/src/main/scala/scala/collection/immutable/OldHashMap.scala b/core/src/main/scala/scala/collection/immutable/OldHashMap.scala
index f4f5c0f4..3dd253cd 100644
--- a/core/src/main/scala/scala/collection/immutable/OldHashMap.scala
+++ b/core/src/main/scala/scala/collection/immutable/OldHashMap.scala
@@ -35,6 +35,7 @@ import scala.collection.mutable.{Builder, ImmutableBuilder}
   *  @define mayNotTerminateInf
   *  @define willNotTerminateInf
   */
+@SerialVersionUID(-2425602972438308285L)
 sealed abstract class OldHashMap[K, +V]
   extends AbstractMap[K, V]
     with MapOps[K, V, OldHashMap, OldHashMap[K, V]]