diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testMethodWriteBarrier3.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testMethodWriteBarrier3.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,27 @@
+function g() {}
+
+function h() {
+    for (var i = 0; i < 9; i++)
+	x.f = i;
+}
+
+function j() {
+    x.f();
+}
+
+var x = {f: 0.7, g: g};
+x.g();  // interpreter brands x
+h();
+print(shapeOf(x));
+x.f = function (){}; // does not change x's shape
+j();
+print(shapeOf(x));
+h(); // should change x's shape
+
+var thrown = 'none';
+try {
+    j(); // should throw since x.f === 8
+} catch (exc) {
+    thrown = exc.name;
+}
+assertEq(thrown, 'TypeError');
\ No newline at end of file