use std::collections::HashMap;

fn thereisnoerror() {
    let mut map = std::collections::HashMap::new();
    map.insert("key1", "value1");
    map.insert("key2", "value2");
    println!("{:?}", map);
}

fn main(){
    let mut h = HashMap::new();
    h.insert(1, "one");
    h.insert(2, "two");
    h.insert(3, "three");
    h.insert(4, "four");
    h.insert(5, "five");
    print!("{:?} ", h);
    //println!("{0}", *h.count(4));
    let mut a = |y: i64| -> i64 { return 1 + y; };
    let result = a(3);
    println!("{}", result);
    match h.get(&4) {
        Some(v) => println!("Found: {}", v),
        None => println!("Not Found"),
    }
}