> A more interesting problem is that, if almost every construct in the language is a message send, and all of the implementation is written in the language, han

> A more interesting problem is that, if almost every construct in the language is a message send, and all of the implementation is written in the language, handling a message send may cause infinite recursion. This is where I suggest reading Ian Piumarta's Open, extensible object models [1] and later his COLA paper [2] Piumarta tried to imagine an entire late-bound, meta-circular system based around message passing, starting from as little C as possible to build a Smalltalk-like language. It is a small paper that had be obsessed for a year trying to imagine how to implement an entire OS based on it. Worth a read. And in the theme of meta-circular Lisp, he also worked on Maru [3] 1: https://www.piumarta.com/software/id-objmodel/objmodel2.pdf https://www.piumarta.com/software/id-objmodel/objmodel2.pdf 2: https://www.piumarta.com/software/cola/ https://www.piumarta.com/software/cola/ 3: https://www.piumarta.com/software/maru/ https://www.piumarta.com/software/maru/