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