diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug797496.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug797496.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,8 @@
+// |jit-test| error: TypeError
+var set = Set(['a']);
+var n = 5;
+for (let v of set) {
+    if (n === 0)
+        break;
+    let g = set(Set(0xffffffff, n), 1);
+}