From 87a033efff2565288233dc7233dae63464e7bef6 Mon Sep 17 00:00:00 2001
From: Dale Wijnand <344610+dwijnand@users.noreply.github.com>
Date: Fri, 2 Nov 2018 11:46:20 +0000
Subject: [PATCH] @DoNotInherit typed.ActorRef (#25851)

---
 .../src/main/scala/akka/actor/typed/ActorRef.scala            | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/akka-actor-typed/src/main/scala/akka/actor/typed/ActorRef.scala b/akka-actor-typed/src/main/scala/akka/actor/typed/ActorRef.scala
index 7a9a3dd49c..bcb4ebdbfe 100644
--- a/akka-actor-typed/src/main/scala/akka/actor/typed/ActorRef.scala
+++ b/akka-actor-typed/src/main/scala/akka/actor/typed/ActorRef.scala
@@ -4,6 +4,7 @@
 
 package akka.actor.typed
 
+import akka.annotation.DoNotInherit
 import akka.annotation.InternalApi
 import akka.{ actor ⇒ a }
 import scala.annotation.unchecked.uncheckedVariance
@@ -20,7 +21,10 @@ import akka.actor.typed.internal.InternalRecipientRef
  * messages are delivered to the [[DeadLetter]] channel of the
  * [[akka.event.EventStream]] on a best effort basis
  * (i.e. this delivery is not reliable).
+ *
+ * Not for user extension
  */
+@DoNotInherit
 trait ActorRef[-T] extends RecipientRef[T] with java.lang.Comparable[ActorRef[_]] with java.io.Serializable { this: InternalRecipientRef[T] ⇒
   /**
    * Send a message to the Actor referenced by this ActorRef using *at-most-once*