diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/jaeger/bug623474.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/jaeger/bug623474.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,10 @@
+for (var j=0;j<2;++j) { (function(o){o.length})(String.prototype); }
+
+for each(let y in [Number, Number]) {
+    try {
+        "".length()
+    } catch(e) {}
+}
+
+/* Don't crash. */
+