“Рустонский хэшсет” Ответ

Рустонский хэшсет

use hashset::hashset;
//	The `hashset!` macro is provided by this crate.

fn main() {
    let mut set = hashset!["a", "b", "c"];
    set.insert("d");
    set.remove("a");
    assert!(set.contains("d"));
    for x in &set {
        println!("{}", x);
    }
}