diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/collections/Set-gc-1.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/collections/Set-gc-1.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,16 @@
+// Check marking through the elements of a Set.
+
+load(libdir + "referencesVia.js");
+
+var s = new Set;
+for (var i = 0; i < 20; i++) {
+    var t = new Set;
+    t.add(s);
+    assertEq(referencesVia(t, 'key', s), true);
+    s = t;
+}
+
+gc();
+gc();
+
+// TODO: walk the chain and make sure it's still intact