diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug510437.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug510437.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,13 @@
+// Don't crash or assert.
+
+var d;
+this.watch("d", eval);
+(function () {
+    (eval("\
+    (function () {\
+        for (let x = 0; x < 2; ++x) {\
+            d = x\
+        }\
+    })\
+"))()
+})()