diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/collections/Set-clear-4.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/collections/Set-clear-4.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,10 @@
+// Clearing a Set after deleting some entries works.
+
+var s = Set(["a", "b", "c", "d"]);
+for (var v of s)
+    if (v !== "c")
+        s.delete(v);
+s.clear();
+assertEq(s.size, 0);
+assertEq(s.has("c"), false);
+assertEq(s.has("d"), false);