diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug646968-7.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug646968-7.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,9 @@
+// |jit-test| debug
+
+function test(s) {
+    eval(s);
+    let (y = evalInFrame(0, '3'), x = x) {
+	assertEq(x, 5);
+    }
+}
+test('var x = 5;');