diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/collections/Map-clear-gc.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/collections/Map-clear-gc.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,14 @@
+// Clearing a Map removes any strong references to its keys and values.
+
+load(libdir + "referencesVia.js");
+
+var m = Map();
+var k = {}, v = {};
+m.set(k, v);
+assertEq(referencesVia(m, "key", k), true);
+assertEq(referencesVia(m, "value", v), true);
+m.clear();
+if (typeof findReferences == 'function') {
+    assertEq(referencesVia(m, "key", k), false);
+    assertEq(referencesVia(m, "value", v), false);
+}