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Otherwise it won't actually test the change of state.message and it would fail to check if the user missed changing state.message This happened to me as I had a catch-all line in `match`
Enums
Rust allows you to define types called "enums" which enumerate possible values. Enums are a feature in many languages, but their capabilities differ in each language. Rust’s enums are most similar to algebraic data types in functional languages, such as F#, OCaml, and Haskell. Useful in combination with enums is Rust's "pattern matching" facility, which makes it easy to run different code for different values of an enumeration.