Regarding ticket 88, I have the following idea: Lisp functions inherit from either Primitive or CompiledClosure. CompiledClosure isn't used elsewhere, but Primitive is used everywhere in Java too. How about creating an (empty) CompiledPrimitive which isn't used Java-side. Then, with a simple 'instanceof' test, functions can be tested to have been compiled from Lisp or created from Java. How about that? Bye, Erik.