even when the underlying language is widely used (in this case, Rust) I think there is a case to coin a new language when (i) there is a bunch of new stuff, (ii) it ain’t gonna be adopted wholesale by the core team and (iii) it has a coherent toolchain and (iv) it makes promises to coders that are stable over time. Disclosure, I am the author of https://bil-lang.org that pulls the same trick as an extension / transpiler targeting golang