diff -r 8d0be6a9a809 -r ef21eeecf47c emul/mini/src/main/java/org/apidesign/bck2brwsr/emul/lang/System.java
--- a/emul/mini/src/main/java/org/apidesign/bck2brwsr/emul/lang/System.java	Fri Feb 01 16:34:51 2013 +0100
+++ b/emul/mini/src/main/java/org/apidesign/bck2brwsr/emul/lang/System.java	Mon Feb 04 09:37:56 2013 +0100
@@ -51,4 +51,7 @@
     public static long nanoTime() {
         return 1000L * currentTimeMillis();
     }
+    @JavaScriptBody(args = { "obj" }, body="return vm.java_lang_Object(false).hashCode__I.call(obj);")
+    public static native int identityHashCode(Object obj);
+    
 }