diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_5/extensions/destructuring-__proto__-target-assignment.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_5/extensions/destructuring-__proto__-target-assignment.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,50 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ */
+
+var gTestfile = 'destructuring-__proto__-target--assignment.js';
+var BUGNUMBER = 963641;
+var summary =
+  "{ __proto__: target } should work as a destructuring assignment pattern";
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+function objectWithProtoProperty(v)
+{
+  var obj = {};
+  return Object.defineProperty(obj, "__proto__",
+                               {
+                                 enumerable: true,
+                                 configurable: true,
+                                 writable: true,
+                                 value: v
+                               });
+}
+
+var { __proto__: target } = objectWithProtoProperty(null);
+assertEq(target, null);
+
+({ __proto__: target } = objectWithProtoProperty("aacchhorrt"));
+assertEq(target, "aacchhorrt");
+
+function nested()
+{
+  var { __proto__: target } = objectWithProtoProperty(3.141592654);
+  assertEq(target, 3.141592654);
+
+  ({ __proto__: target } = objectWithProtoProperty(-0));
+  assertEq(target, -0);
+}
+nested();
+
+/******************************************************************************/
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
+
+print("Tests complete");