to-lose-letrec

Interesting!

Do you have a particular use case in mind for this, OP? It's certainly always a fun and educational exercise to make a Lisp in another language, but the embedded aspect had me wondering if there is a particular problem that you aim to solve by that integration.

I'm picturing something like libguile does with Scheme?

Well, I have some thin clients kicking around that are used as "terminals" for much more modern servers. Since all they have to do is either netboot or run a VNC client, they work great. That's one possible use.

Performance Improvement Plans.

Basically a company's last effort to cover their butts before firing you. If you contest the termination, they can claim they gave you fair warning and a chance to improve.

If you're ever on one, the sensible course of action is to look for another job. You're next on the chopping block.