1 files changed, 24 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/statements/async-function/evaluation-unmapped-arguments.js b/js/src/tests/test262/language/statements/async-function/evaluation-unmapped-arguments.js
new file mode 100644
index 0000000000..1f94e09bb8
--- /dev/null
+++ b/js/src/tests/test262/language/statements/async-function/evaluation-unmapped-arguments.js
@@ -0,0 +1,24 @@
+// |reftest| async
+// Copyright 2016 Microsoft, Inc. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+author: Brian Terlson <brian.terlson@microsoft.com>
+esid: pending
+description: >
+  Unmapped arguments object is used when the async function doesn't have a
+  simple parameter list.
+flags: [async]
+---*/
+
+
+async function foo(a = 42) {
+  arguments[0] = 2;
+  assert.sameValue(a, 1);
+
+  a = 3;
+  assert.sameValue(arguments[0], 2);
+}
+
+foo(1).then($DONE, $DONE);
+