diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug569849.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug569849.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,9 @@
+function g() {
+    function f(a) {
+        delete a.x;
+    }
+    for each(let w in [Infinity, String()]) {
+        let i = f(w);
+    }
+}
+g();