IIUC, copying over RustPython parser is an interesting detail, but that change happened earlier (2023!) when they were building Ruff, so it is old news. This piece of code called red-knot seems to be mostly original work, as far as I can tell.

https://github.com/astral-sh/ruff/issues?q=is%3Aopen+label%3Ared-knot+sort%3Acreated-asc

Actually, it was invented by Douglas Engelbart in Stanford in the 60s

https://dougengelbart.org/content/view/162/000/

Xerox (re)made it for the PC in the 80s.

I agree to a certain extent; at least elementary school should and remain device free.