diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/pic/watch3.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/pic/watch3.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,7 @@
+// assignment to watched global properties must not be cached
+x = 0;
+var hits = 0;
+this.watch("x", function (id, oldval, newval) { hits++; return newval; });
+for (var i = 0; i < 10; i++)
+    x = i;
+assertEq(hits, 10);