list concatenation monoid should not invert arguments

marcosh · Sep 27, 2023 · f39d9cb · f39d9cb
1 parent d433cfe
commit f39d9cb
Showing 1 changed file with 1 addition and 1 deletion.
diff --git 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);
     }
 }