diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/jaeger/bug630366.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/jaeger/bug630366.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,7 @@
+var o = {};
+for(var i=0; i<5; i++) {
+    o.p = 2;
+    o.watch("p", function() { });
+    o.p = 2;
+    delete o.p;
+}