In Clojure, you don't typically type code into the REPL, but write code in a file and then evaluate that code in a REPL connected to your editor. We don't just type into a console window, then reboot for some OS updates and forget about our previous efforts :). Combining this with a static analysis tool / linter like clj-kondo will also help since it will remind you that you removed certain functions, while they may still be there in the REPL.