diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_5/JSON/parse-array-gc.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_5/JSON/parse-array-gc.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,31 @@
+// Any copyright is dedicated to the Public Domain.
+// http://creativecommons.org/licenses/publicdomain/
+
+var gTestfile = "parse-array-gc.js";
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 852563;
+var summary =
+  "IdValuePair::value should be initialized to avoid GC sequence-point issues";
+
+print(BUGNUMBER + ": " + summary);
+
+print("Note: You must run this test under valgrind to be certain it passes");
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+var x;
+
+if (typeof gczeal === "function")
+  gczeal(2, 1);
+x = JSON.parse('{"foo":[]}');
+Object.getPrototypeOf(x.foo) == Array.prototype;
+x = JSON.parse('{"foo":[], "bar":[]}');
+
+/******************************************************************************/
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
+
+print("Tests complete");