Function into_iter

cranelift/bforest/src/map.rs:1445–1468

()

    #[test]
    fn into_iter() {
        let mut f = MapForest::<u32, f32>::new();
        let mut m = Map::<u32, f32>::new();

        for i in 10..20 {
            m.insert(i, i as f32, &mut f, &());
        }

        assert_eq!(
            m.into_iter(f).collect::<Vec<_>>(),
            vec![
                (10, 10.0),
                (11, 11.0),
                (12, 12.0),
                (13, 13.0),
                (14, 14.0),
                (15, 15.0),
                (16, 16.0),
                (17, 17.0),
                (18, 18.0),
                (19, 19.0),
            ],
        );
    }

    #[test]
    fn range() {