Coding in Common Lisp using the Medley Interlisp environment is subtly different from modern Lisp systems. In this post I explained why, and provided a suitable workflow which I hope makes some sense and helps newcomers:
https://journal.paoloamoroso.com/a-single-package-common-lisp-workflow-for-medley
@SergeStinckwich Yes, but Medley is more of an hybrid system.