Comment by mbStavola

For Rust enthusiasts, there is an old RFC[0] that would have added a "become" keyword which guaranteed tco. It was originally postponed in favor of focusing on the 2018 edition's goals (which was the right call) but the initiative has been revisited recently[1]. Maybe it'll make a comeback!

[0]: https://github.com/rust-lang/rfcs/pull/1888 [1]: https://github.com/rust-lang/rfcs/pull/3407