diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/collections/Array-of-1.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/collections/Array-of-1.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,15 @@
+// Array.of makes real arrays.
+
+function check(a) {
+    assertEq(Object.getPrototypeOf(a), Array.prototype);
+    assertEq(Array.isArray(a), true);
+    a[9] = 9;
+    assertEq(a.length, 10);
+}
+
+check(Array.of());
+check(Array.of(0));
+check(Array.of(0, 1, 2));
+
+var f = Array.of;
+check(f());