You may be interested in the `im` crate for Rust, which implements efficient copy-on-write structural sharing, falling back to in-place mutation when there are

You may be interested in the `im` crate for Rust, which implements efficient copy-on-write structural sharing, falling back to in-place mutation when there are no other outstanding references. https://docs.rs/im/14.1.0/im/ https://docs.rs/im/14.1.0/im/