Lisp in ~100 lines of Python:

https://flownet.com/ron/l.py

A better starting point:

https://github.com/Robert-van-Engelen/tinylisp/blob/main/tin...

Holy cow this is —structurally, not just expression— some of the worst C code I have ever seen, with the abuse of the 'double' type, 'T' cast that looks like a declaration, endian dependency, and strict aliasing violations galore… does this even work on a modern compiler? o.O

Previously:

* https://news.ycombinator.com/item?id=32100035

* https://news.ycombinator.com/item?id=32095655

and

* https://BI6.US/CO/N/20250420.HTML#/042402

can it execute the y-combinator?

  (define Y (lambda (f) (lambda args ((f (Y f)) . args))))

[dead]