I have, once or twice, ended up in a position where "code saved in file" would load perfectly fine in my hacked-in image, but fail to load (or compile) in a fre

I have, once or twice, ended up in a position where "code saved in file" would load perfectly fine in my hacked-in image, but fail to load (or compile) in a fresh image. This is (usually) a sign that I forgot one function or macro in the code-on-disk, that I hand-chased in the REPL. In neither case was it hard to rectify, but it did leave me a bit confused. And very thankful that I had not quit the main dev image. After that, I have explicitly added "add a test suite, run test suite in fresh image" as a technique to keep that from persisting for a long time. And simply doing that seems to keep me subconsciously aware of the problem and not making it appear in the first place.