diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/collections/Set-clear-3.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/collections/Set-clear-3.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,10 @@
+// Clearing a Set with a nontrivial number of elements works.
+
+var s = Set();
+for (var i = 0; i < 100; i++)
+    s.add(i);
+assertEq(s.size, i);
+s.clear();
+assertEq(s.size, 0);
+s.add(12);
+assertEq(s.has(12), true);