diff -r 9753524d698f -r b703d9d71f25 launcher/fx/src/main/java/org/apidesign/bck2brwsr/launcher/fximpl/Fn.java
--- a/launcher/fx/src/main/java/org/apidesign/bck2brwsr/launcher/fximpl/Fn.java	Mon Jun 10 18:19:40 2013 +0200
+++ b/launcher/fx/src/main/java/org/apidesign/bck2brwsr/launcher/fximpl/Fn.java	Mon Jun 17 19:36:24 2013 +0200
@@ -27,6 +27,6 @@
         return cl.defineFn(code, names);
     }
 
-    public abstract Object invoke(Object... args) throws Exception;
+    public abstract Object invoke(Object thiz, Object... args) throws Exception;
     
 }