diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/write-frozen-property.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/write-frozen-property.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,8 @@
+
+function foo(x) {
+  x.a = 10;
+  assertEq(x.a, 0);
+}
+x = {a:0,b:1};
+Object.freeze(x);
+foo(x);