diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testAliasedLet.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testAliasedLet.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,11 @@
+function f() {
+    let (x, y, z) {
+        eval('x = 1; y = 2; z = 3');
+        for (var i = 0; i < 10000; ++i) {
+            assertEq(x, 1);
+            assertEq(y, 2);
+            assertEq(z, 3);
+        }
+    }
+}
+f();