Comment by samatman

While I have no particular beef with Rust deciding to call its sum types "enum", to refer to this as the actual enum is a bit much.

Enumerated types are simply named integers in most languages, exactly the sort you get with const / iota in Go: https://en.wikipedia.org/wiki/Enumerated_type

Rather than the tagged union which the word represents in Rust, and only Rust. Java's enums are close, since they're classes and one can add arbitrary behaviors and extra data associated with the enum.