diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testMethodSet.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testMethodSet.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,13 @@
+function testMethodSet() {  // bug 503198
+    function o() { return 'o'; }
+    function k() { return 'k'; }
+
+    var x;
+    for (var i = 0; i < 10; i++) {
+        x = {};
+        x.o = o;
+        x.k = k;
+    }
+    return x.o() + x.k();
+}
+assertEq(testMethodSet(), "ok");