I recently vibe-coded a Ruby interpreter, as a single-header C file, meant to be embedded (like Lua). I call it Luby: https://github.com/halferty/luby
This is a small piece in a larger game engine I've been working on. Typically, Lua is used for game scripting, but I never liked Lua syntax, and I do like Ruby syntax, so I burned a few LLM cycles cooking up this little interpreter.