diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testAtomize.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testAtomize.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,10 @@
+function testAtomize() {
+    x = {};
+    for (var i = 0; i < 65536; ++i)
+	x[String.fromCharCode(i)] = 1;
+    var z = 0;
+    for (var p in x)
+	++z;
+    return z;
+}
+assertEq(testAtomize(), 65536)