From c7fcbd96dc6ce646e1df2ec3e87f4e60b03f306f Mon Sep 17 00:00:00 2001
From: Niklas Keller <me@kelunik.com>
Date: Fri, 9 Jun 2017 17:22:11 +0200
Subject: [PATCH] Make NullCancellationToken final

---
 lib/NullCancellationToken.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/NullCancellationToken.php b/lib/NullCancellationToken.php
index 170ec125..c8f242ae 100644
--- a/lib/NullCancellationToken.php
+++ b/lib/NullCancellationToken.php
@@ -25,7 +25,7 @@
  *
  * instead.
  */
-class NullCancellationToken implements CancellationToken {
+final class NullCancellationToken implements CancellationToken {
     /** @inheritdoc */
     public function subscribe(callable $callback): string {
         return "null-token";