A summary of key differences from Rust: A richer collection of build-in memory management strategies (e.g., tracing GC), Pony-inspired permissions (esp. safe shared, mutable), structural subtyping (as well as nominal), and a bunch of features intended to improve ease-of-use and productivity. At some point, I will write up a page on my web site to explain Cone better for someone coming from Rust (or C++ or ..).