diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/collections/Array-of-cross-compartment.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/collections/Array-of-cross-compartment.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,10 @@
+// Array.of returns an object in the target compartment, not the caller's compartment.
+// This rules out implementations along the lines of (...args) => args.
+
+var g = newGlobal();
+var ga = g.Array.of(1, 2, 3);
+assertEq(ga instanceof g.Array, true);
+
+g.Array.of = Array.of;
+var a = g.Array.of(1, 2, 3); // this-value is a wrapper of g.Array, which IsConstructor, so we call it
+assertEq(ga instanceof g.Array, true);  // it produces a g.Array instance