diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug646968-4.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug646968-4.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,4 @@
+var s = '', x = {a: 1, b: 2, c: 3};
+for (let x in eval('x'))
+    s += x;
+assertEq(s, 'abc');