1 files changed, 31 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/WeakSet/proto-from-ctor-realm.js b/js/src/tests/test262/built-ins/WeakSet/proto-from-ctor-realm.js
new file mode 100644
index 0000000000..94a58c6e7e
--- /dev/null
+++ b/js/src/tests/test262/built-ins/WeakSet/proto-from-ctor-realm.js
@@ -0,0 +1,31 @@
+// 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-weakset-iterable
+description: Default [[Prototype]] value derived from realm of the newTarget
+info: |
+    [...]
+    2. Let set be ? OrdinaryCreateFromConstructor(NewTarget,
+       "%WeakSetPrototype%", « [[WeakSetData]] »).
+    [...]
+
+    9.1.14 GetPrototypeFromConstructor
+
+    [...]
+    3. Let proto be ? Get(constructor, "prototype").
+    4. If Type(proto) is not Object, then
+       a. Let realm be ? GetFunctionRealm(constructor).
+       b. Let proto be realm's intrinsic object named intrinsicDefaultProto.
+    [...]
+features: [cross-realm, Reflect]
+---*/
+
+var other = $262.createRealm().global;
+var C = new other.Function();
+C.prototype = null;
+
+var o = Reflect.construct(WeakSet, [], C);
+
+assert.sameValue(Object.getPrototypeOf(o), other.WeakSet.prototype);
+
+reportCompare(0, 0);