diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testDifferingArgc.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testDifferingArgc.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,18 @@
+function doTestDifferingArgc(a, b)
+{
+    var k = 0;
+    for (var i = 0; i < 10; i++)
+    {
+        k += i;
+    }
+    return k;
+}
+function testDifferingArgc()
+{
+    var x = 0;
+    x += doTestDifferingArgc(1, 2);
+    x += doTestDifferingArgc(1);
+    x += doTestDifferingArgc(1, 2, 3);
+    return x;
+}
+assertEq(testDifferingArgc(), 45*3);