#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::hash::{DefaultHasher, Hash, Hasher};
struct Person {
    id: u32,
    #[allow(dead_code)]
    name: String,
    phone: u64,
}
impl Hash for Person {
    fn hash<H: Hasher>(&self, state: &mut H) {
        self.id.hash(state);
        self.phone.hash(state);
    }
}
fn calculate_hash<T: Hash>(t: &T) -> u64 {
    let mut s = DefaultHasher::new();
    t.hash(&mut s);
    s.finish()
}
fn main() {
    let person1 = Person {
        id: 5,
        name: "Janet".to_string(),
        phone: 555_666_7777,
    };
    let person2 = Person {
        id: 5,
        name: "Bob".to_string(),
        phone: 555_666_7777,
    };
    assert_eq!(calculate_hash(& person1), calculate_hash(& person2));
}