From f39d9cb2e343b00fdf3bc7e9b2b59bbe6b8e5862 Mon Sep 17 00:00:00 2001
From: Marco Perone <pasafama@gmail.com>
Date: Wed, 27 Sep 2023 10:31:17 +0200
Subject: [PATCH] list concatenation monoid should not invert arguments

---
 src/Instances/ListL/ConcatenationMonoid.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Instances/ListL/ConcatenationMonoid.php b/src/Instances/ListL/ConcatenationMonoid.php
index 6122282..8187c53 100644
--- a/src/Instances/ListL/ConcatenationMonoid.php
+++ b/src/Instances/ListL/ConcatenationMonoid.php
@@ -29,6 +29,6 @@ public function mempty(): array
      */
     public function append($a, $b)
     {
-        return array_merge($b, $a);
+        return array_merge($a, $b);
     }
 }