True, and that's a good example. I guess what I'm really wondering is how many languages are written in clojure. Clojurescript for instance is just clojure compiling itself.
I remember seeing a few toy ones. No real serious languages though.
I don't think the parent meant to implement an elisp interpreter in Clojure. I thought they meant to build an Emacs like editor in Clojure. Similar to this now abandonned project: https://github.com/hraberg/deuce
There'd be no point in re-writing an Elisp compiler/interpreter in Clojure over its current C implementation apart maybe for if you think it be nice for you to work in Clojure instead of C when coding on it.
I can see the parent misconstruing compiling elisp with building a new emacs-like editor, but the thread (and article) was about compiling elisp.
That being said a clojure editor could be pretty fun, the oy downside being writing native widgets for a gui. I hardly know anyone who uses emacs in a shell if they can help it, and i know far more people who would prefer to use a shell inside of emacs instead.