diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testExistingPropToJoinedMethodAttempt.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testExistingPropToJoinedMethodAttempt.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,10 @@
+function f() {
+    var a = [], i, N = 10;
+    for (i = 0; i < N; i++)
+        a[i] = {m: i};
+    for (i = 0; i < N; i++)
+        a[i].m = function() { return 0; };
+    assertEq(a[N - 2].m === a[N - 1].m, false);
+}
+f();
+f();