[es6] throw TypeError when setting cyclic prototype value

test/mjsunit/proto-accessor.js

Index: test/mjsunit/proto-accessor.js
diff --git a/test/mjsunit/proto-accessor.js b/test/mjsunit/proto-accessor.js
index 513a044023e9db5d74449f5f4d46fb02a74ff571..935ea8dbeb3a4ef48be46c3961ea4c69e5e6cf8a 100644
--- a/test/mjsunit/proto-accessor.js
+++ b/test/mjsunit/proto-accessor.js
@@ -29,6 +29,24 @@
 this.Symbol = typeof Symbol != 'undefined' ? Symbol : String;
 
 
+function TestSetProtoValueCyclic() {
+  var objects = [
+    Object.prototype, {},
+    Array.prototype, [],
+    Error.prototype, new TypeError,
+    // etc ...
+  ];
+  for (var i = 0; i < objects.length; i += 2) {
+    var object = objects[i];
+    var value = objects[i+1];
+    assertThrows(function() {
+      object.__proto__ = value;
+    }, TypeError);
+  }
+};
+TestSetProtoValueCyclic();
+
+
 var desc = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__");
 var getProto = desc.get;
 var setProto = desc.set;