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diff --git a/js/src/jit-test/tests/collections/Array-of-cross-compartment.js b/js/src/jit-test/tests/collections/Array-of-cross-compartment.js
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+++ b/js/src/jit-test/tests/collections/Array-of-cross-compartment.js
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+// 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