diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testBug775807.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testBug775807.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,19 @@
+// |jit-test| dump-bytecode;error:SyntaxError
+
+(function() {
+    const x = ((function() {
+        return {
+            e: function() {
+                (function() {
+                    for (e in x) {}
+                })()
+            }
+        }
+    }(function() {
+        return {
+            t: {
+                c
+            }
+        }
+    })))
+})()