There's the very good Trivia library for pattern matching: https://lispcookbook.github.io/cl-cookbook/pattern_matching.html https://lispcookbook.github.io/cl-co

There's the very good Trivia library for pattern matching: https://lispcookbook.github.io/cl-cookbook/pattern_matching.html https://lispcookbook.github.io/cl-cookbook/pattern_matching.... (and I think libraries are better maintained that Racket's)