diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testCallProtoMethod.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testCallProtoMethod.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,14 @@
+function testCallProtoMethod() {
+    function X() { this.x = 1; }
+    X.prototype.getName = function () { return "X"; }
+
+    function Y() { this.x = 2; }
+    Y.prototype.getName = function() "Y";
+
+    var a = [new X, new X, new X, new X, new Y];
+    var s = '';
+    for (var i = 0; i < a.length; i++)
+        s += a[i].getName();
+    return s;
+}
+assertEq(testCallProtoMethod(), 'XXXXY');