diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/collections/Map-clear-4.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/collections/Map-clear-4.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,10 @@
+// Clearing a Map after deleting some entries works.
+
+var m = Map([["a", 1], ["b", 2], ["c", 3], ["d", 4]]);
+for (var [k, v] of m)
+    if (k !== "c")
+        m.delete(k);
+m.clear();
+assertEq(m.size, 0);
+assertEq(m.has("c"), false);
+assertEq(m.has("d"), false);