Method last_name

2a_builder_pattern/rust/builder/src/main.rs:34–37

(mut self, last_name: impl Into<String>)

    #[allow(dead_code)]
    fn last_name(mut self, last_name: impl Into<String>) -> Self {
        self.last_name = Some(last_name.into());
        self
    }

    fn build(self) -> User {
        let Self {