CL also has pretty much arbitrarily extensible syntax:

- https://sr.ht/~dieggsy/whisper/

- https://dieggsy.com/json-literals.html

And could also be used to build languages, supporting more modern programming paradigms (though yes, I believe Racket does make this easier):

- https://coalton-lang.github.io/

I also might have written the Common Lisp example using reduce as well, which is in the standard library, but that's preference. Nice to have the option though:

  (defun calculate (instructions)
    (reduce
     (lambda (result op-value)
       (destructuring-bind (operation value) op-value
         (case operation
           (:add (+ result value))
           (:subtract (- result value))
           (:multiply (* result value)))))
     instructions
     :initial-value 0))

  (calculate '((:add 5) (:multiply 3) (:subtract 4))) ;; => 11