Function basic

cranelift/entity/src/boxed_slice.rs:164–175

()

    #[test]
    fn basic() {
        let r0 = E(0);
        let r1 = E(1);
        let p = PrimaryMap::<E, isize>::new();
        let m = p.into_boxed_slice();

        let v: Vec<E> = m.keys().collect();
        assert_eq!(v, []);

        assert!(!m.is_valid(r0));
        assert!(!m.is_valid(r1));
    }

    #[test]
    fn iter() {