I wonder if LoL was not referring instead to Let Over Lambda which I'd call more timeless... For Land of Lisp there is some implementation specific code the aut

I wonder if LoL was not referring instead to Let Over Lambda which I'd call more timeless... For Land of Lisp there is some implementation specific code the author uses, but he points that out, points out that there are libraries that make a de facto standard for the behavior, but didn't want to introduce quicklisp. (It's a fun book but not the best if your goal is getting productive in a work environment fast, in which case learning about asdf and quicklisp early on is crucial...) Lisp books in my experience have been the most reliable for running old code. I can take Lisp code from 1960 and almost entirely unmodified run it in a modern Common Lisp implementation because there's a direct line of heritage. If a book from the 90s says it supports Common Lisp, well hey, barring errata the code still works every time...