diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/collections/Map-gc-3.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/collections/Map-gc-3.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,12 @@
+// Maps do not keep deleted keys or values alive.
+
+load(libdir + "referencesVia.js");
+
+var m = new Map;
+var k = {}, v = {};
+m.set(k, v);
+m.delete(k);
+if (typeof findReferences == 'function') {
+    assertEq(referencesVia(m, 'key', k), false);
+    assertEq(referencesVia(m, 'value', v), false);
+}