I noticed it here:
https://github.com/oriansj/stage0
Which I got to via here: https://gitlab.com/janneke/mes
"This C prototype will be rewritten in [[https://github.com/oriansj/stage0%5D%5Bstage0]] M1"
I noticed that Parrot also had a M1 "phase" for code, which made me wonder if that was VM code or what-not (iirc Parrot uses a VM).