1 files changed, 30 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/arguments-object/unmapped/via-params-rest.js b/js/src/tests/test262/language/arguments-object/unmapped/via-params-rest.js
new file mode 100644
index 0000000000..8c4dab8dcd
--- /dev/null
+++ b/js/src/tests/test262/language/arguments-object/unmapped/via-params-rest.js
@@ -0,0 +1,30 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-functiondeclarationinstantiation
+es6id: 9.2.12
+description: >
+  Arguments are "unmapped" when paramater list is non-simple due to "rest"
+  parameter
+info: |
+  [...]
+  9. Let simpleParameterList be IsSimpleParameterList of formals.
+  [...]
+  22. If argumentsObjectNeeded is true, then
+      a. If strict is true or if simpleParameterList is false, then
+         i. Let ao be CreateUnmappedArgumentsObject(argumentsList).
+      [...]
+---*/
+
+var value;
+
+function rest(a, ...b) {
+  arguments[0] = 2;
+  value = a;
+}
+
+rest(1);
+
+assert.sameValue(value, 1);
+
+reportCompare(0, 0);