Not really the same. That's rather like saying because I have a chassis and some wheels and an engine piled in the garage, I have a car. They have to be conne

Not really the same. That's rather like saying because I have a chassis and some wheels and an engine piled in the garage, I have a car. They have to be connected together in the right way to make Shen. Shen is available under Clojure and has been for about 2 years. I'll also add that IMO there is a difference between having these features in a library and having them in the language standard. Common Lisp for instance, has had pattern-matching in various forms, but if you look at the code contributions on comp.lang.lisp these extensions are not often used.