1 files changed, 37 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Object/prototype/__proto__/set-cycle-shadowed.js b/js/src/tests/test262/built-ins/Object/prototype/__proto__/set-cycle-shadowed.js
new file mode 100644
index 0000000000..ca372a8165
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Object/prototype/__proto__/set-cycle-shadowed.js
@@ -0,0 +1,37 @@
+// 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-object.prototype.__proto__
+es6id: B.2.2.1
+description: >
+    Cycles are not detected when a Proxy exotic object exists in the prototype
+    chain
+info: |
+    [...]
+    4. Let status be ? O.[[SetPrototypeOf]](proto).
+    5. If status is false, throw a TypeError exception.
+
+    9.1.2.1 OrdinarySetPrototypeOf
+
+    [...]
+    6. Let p be V.
+    7. Let done be false.
+    8. Repeat while done is false,
+       a. If p is null, let done be true.
+       b. Else if SameValue(p, O) is true, return false.
+       c. Else,
+          i. If the [[GetPrototypeOf]] internal method of p is not the ordinary
+             object internal method defined in 9.1.1, let done be true.
+          ii. Else, let p be the value of p's [[Prototype]] internal slot.
+features: [__proto__]
+---*/
+
+var root = {};
+var intermediary = new Proxy(Object.create(root), {});
+var leaf = Object.create(intermediary);
+
+root.__proto__ = leaf;
+
+assert.sameValue(Object.getPrototypeOf(root), leaf);
+
+reportCompare(0, 0);