diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testBug776191.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testBug776191.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,7 @@
+(function() {
+    let(a, b, c) {
+        ((function() {
+            with({}) let(b) { ((function() { c = 0 })()) }
+        })())
+    }
+})()