Not sure about Rust, but Typescript allows you to have the default handling but still flag a compile error if a new field is added (the first is useful e.g. if a separate component is updated and starts sending new values).
Mussolini used the word 'corporation' in a different sense to the modern sense of a public company. He was referring instead to different sectors of society, something like a 'guild'.
https://stackoverflow.com/a/39419171/974188