I think we can agree that if you don't have tests, you don't have a compiler. You don't have anything, really not even a toy. But there are too many languages

I think we can agree that if you don't have tests, you don't have a compiler. You don't have anything, really not even a toy. But there are too many languages out there in production that don't have debugging support worth a tinker's damn. (I spent quite a few years working on toolchains, jitters and runtime systems. It's fun stuff).