diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testMethodWriteBarrier.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testMethodWriteBarrier.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,4 @@
+var x = {p: 0.1, m: function(){}};
+x.m();  // the interpreter brands x
+for (var i = 0; i < 9; i++)
+    x.p = 0.1;