From 418419a34570761035cddb65e6e4a090defe6555 Mon Sep 17 00:00:00 2001
From: Kevin Gibbons <bakkot@gmail.com>
Date: Sun, 7 Aug 2022 20:10:26 -0700
Subject: [PATCH] add non-matching example

---
 test/built-ins/RegExp/named-groups/duplicate-names.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/test/built-ins/RegExp/named-groups/duplicate-names.js b/test/built-ins/RegExp/named-groups/duplicate-names.js
index 8213a3e0c2..7ad34406eb 100644
--- a/test/built-ins/RegExp/named-groups/duplicate-names.js
+++ b/test/built-ins/RegExp/named-groups/duplicate-names.js
@@ -17,3 +17,6 @@ assert.compareArray(["bb", undefined, "bb"], "bb".match(/(?:(?<x>a)|(?<x>b))\k<x
 let matchResult = "aabb".match(/(?:(?:(?<x>a)|(?<x>b))\k<x>){2}/);
 assert.compareArray(["aabb", undefined, "bb"], matchResult);
 assert.sameValue(matchResult.groups.x, "bb");
+
+let notMatched = "abab".match(/(?:(?:(?<x>a)|(?<x>b))\k<x>){2}/);
+assert.sameValue(null, notMatched);