There`s tons of Rust language documentation available on the web, but too many lack a "last updated" date tag allowing readers to decide whether they are reading something that is 3 months old, 1 year old or 5 years old.
e.g. anyone trying to learn about Rust error management using on-line docs ends up with a confusing mess of recommendations regarding the use of unwrap(), match statements, Result <> , operator ? etc.
Obviously outdated online docs cant be avoided given that Rust is evolving, but including a "last updated" date would help users place less emphasis on older information which is more likely to be outdated