>In Common Lisp, there is a function called ed, support for which is implementation-defined. If support is available, it is supposed to bring up an editor of so

>In Common Lisp, there is a function called ed, support for which is implementation-defined. If support is available, it is supposed to bring up an editor of some kind to allow a function definition to be edited. That is squarely a homoiconic feature. It's enough that the language stores the current source code and can reload it for that. So hot-code-swapping/reload is enough, not homoiconicity needed - which makes it not so squarely a homoiconic feature.