1 files changed, 21 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/RegExp/duplicate-named-capturing-groups-syntax.js b/js/src/tests/test262/built-ins/RegExp/duplicate-named-capturing-groups-syntax.js
new file mode 100644
index 0000000000..4064af92a3
--- /dev/null
+++ b/js/src/tests/test262/built-ins/RegExp/duplicate-named-capturing-groups-syntax.js
@@ -0,0 +1,21 @@
+// |reftest| skip -- regexp-duplicate-named-groups is not supported
+// Copyright 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-regexp-pattern-flags
+description: Runtime parsing of syntax for duplicate named capturing groups
+features: [regexp-duplicate-named-groups]
+---*/
+
+assert.throws(
+  SyntaxError,
+  () => new RegExp("(?<x>a)(?<x>b)"),
+  "Duplicate named capturing groups in the same alternative do not parse"
+);
+
+let source = "(?<x>a)|(?<x>b)";
+let parsed = new RegExp(source);
+assert.sameValue(parsed.source, source, "Duplicate named capturing groups in separate alternatives parse correctly");
+
+reportCompare(0, 0);