diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testMethodWriteBarrier2.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testMethodWriteBarrier2.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,17 @@
+function C() {
+    this.m = function () {};  // JSOP_SETMETHOD
+}
+
+var a = [new C, new C, new C, new C, new C, new C, new C, new C, new C];
+var b = [new C, new C, new C, new C, new C, new C, a[8],  new C, new C];
+
+var thrown = 'none';
+try {
+    for (var i = 0; i < 9; i++) {
+	a[i].m();
+	b[i].m = 0.7;  // MethodWriteBarrier required here
+    }
+} catch (exc) {
+    thrown = exc.name;
+}
+assertEq(thrown, 'TypeError');