Function basic

cranelift/entity/src/primary.rs:390–400

()

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

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

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

    #[test]
    fn push() {