diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/collections/Array-of-generic-2.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/collections/Array-of-generic-2.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,11 @@
+// Array.of passes the number of arguments to the constructor it calls.
+
+var hits = 0;
+function Herd(n) {
+    assertEq(arguments.length, 1);
+    assertEq(n, 5);
+    hits++;
+}
+Herd.of = Array.of;
+Herd.of("sheep", "cattle", "elephants", "whales", "seals");
+assertEq(hits, 1);