Rue: A Quick Reference (and How It Came to Be)

Steve Klabnik spent 13 years on Rust's core team and co-wrote the book that taught most of us the language. Then, over 11 days in December 2025, he built Rue with Claude — a systems language that keeps memory safety but throws out Rust's hardest feature: the borrow checker. Here's the story, plus a cheat sheet for the syntax.









