lisp.rs lis.py ported to rust jsdf:lisp_rs jfriend🔥 cargo run lisp.rs> (+ 2 2) => 4 lisp.rs> (begin (define r 10) (* pi (* r r))) => 314.1592653589793 lisp.rs> (if (> 10 20) (+ 1 1) (+ 3 3)) => 6