Is there anything that can be achieved by using the visitor pattern [0], that cannot be done by using pattern matching? I have only used the visitor pattern in languages that do not have pattern matching as a language feature (e.g. Java before it got a Scala-like `switch` construct [1]).
Edit: one limitation of pattern matching is, that all values need a common supertype (e.g. be variants of the same enum in Rust, if we see each variant as a type and the enum as the common supertype. There is an RFC [2] to make enum variants accessible as types), while the visitor pattern could be implemented for any set of independent types. On the other hand, you then cannot have a typed collection/container that contains values of these types, so you'd need some common trait like `Visitable` so you could accept an `Vec<dyn Visitable>`.
[0]: https://rust-unofficial.github.io/patterns/patterns/visitor....