diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/jaeger/clonefun.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/jaeger/clonefun.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,17 @@
+
+// Functions which have been marked as singletons should not be cloned.
+
+BeatDetektor = function()
+{
+    this.config = BeatDetektor.config;
+
+    assertEq(this.config.a, 0);
+    assertEq(this.config.b, 1);
+}
+
+BeatDetektor.config_default = { a:0, b:1 };
+BeatDetektor.config = BeatDetektor.config_default;
+
+var bd = new BeatDetektor();
+
+assertEq(bd.config === BeatDetektor.config, true);