diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/missingArgTest2.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/missingArgTest2.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,26 @@
+JSON = function () {
+    return {
+        stringify: function stringify(value, whitelist) {
+            switch (typeof(value)) {
+              case "object":
+                return value.constructor.name;
+            }
+        }
+    };
+}();
+
+function missingArgTest2() {
+  var testPairs = [
+    ["{}", {}],
+    ["[]", []],
+    ['{"foo":"bar"}', {"foo":"bar"}],
+  ]
+
+  var a = [];
+  for (var i=0; i < testPairs.length; i++) {
+    var s = JSON.stringify(testPairs[i][1])
+    a[i] = s;
+  }
+  return a.join(",");
+}
+assertEq(missingArgTest2(), "Object,Array,Object");