Yes, exactly. I am confused. Why use Clojure for the example, when Clojure already has this built in? I don't know all of the Lisp's, but if one of them does no

Yes, exactly. I am confused. Why use Clojure for the example, when Clojure already has this built in? I don't know all of the Lisp's, but if one of them does not have this, it would make sense to offer the example in that language. Having said that, there is probably some educational value in writing out what a special form would look like if it was not a special form, so in that regard, yes, this is interesting to look at.