type MyTrait trait {}

type Pair[K, V: MyTrait] struct {
    k: K,
    v: V,
}

type Value struct {
    value: i64,
}

impl MyTrait for Value {}


impl [K, V: MyTrait] Pair[K, V] {
    fn get_value[T](self: Self, a: T): V {
        return self.v;
    }
}

fn main(): i64 {
    let a = Pair[i64, Value]{
        k: 4,
        v: Value{value: 6},
    };
    return a.get_value[i64](999).value;
}