Shared via Rust Playground

playground.rs

#[derive(Debug)]
struct Person {
    name: String,
    never_change_this: i32,
}
impl Person {
    fn new(name: String, never_change_this: i32) -> Person {
        Person {
            name: name,
            never_change_this: never_change_this,
        }
    }
    fn name(&self) -> &str {
        &self.name
    }
    fn name_mut(&mut self) -> &mut String {
        &mut self.name
    }
    fn never_change_this(&self) -> &i32 {
        &self.never_change_this
    }
}

fn main() {
    let mut person = Person::new(String::from("Eddy"), 12);
    println!("After Construction\n{:#?}", person);

    *person.name_mut() = String::from("Bob");
    println!("After Name Change\n{:#?}", person);
}