I'm not sure what you are trying to show? Code can be in one line? Okaaaaay... I was trying to show that one can define local variables without adding another

I'm not sure what you are trying to show? Code can be in one line? Okaaaaay... I was trying to show that one can define local variables without adding another list level via let. Like if one would/could write in Clojure: (defn sum-and-square [a b &blah sum (+ a b)] (* sum sum)) Another Common Lisp example, we'll stick to your one liner format, using infix syntax via a reader macro: (defun sum-and-square (a b) #I(sum=a+b,sum*sum)) Before you ask: what am I trying to show? This shows that Common Lisp syntax can be deeply extended by the user and that this is a standard feature of the language. Want a shorter infix notation without s-expressions? Why not...