Function formatting

src/pointer.rs:1698–1709

()

    #[test]
    fn formatting() {
        assert_eq!(PointerBuf::from_tokens(["foo", "bar"]), "/foo/bar");
        assert_eq!(
            PointerBuf::from_tokens(["~/foo", "~bar", "/baz"]),
            "/~0~1foo/~0bar/~1baz"
        );
        assert_eq!(PointerBuf::from_tokens(["field", "", "baz"]), "/field//baz");
        assert_eq!(PointerBuf::default(), "");

        let ptr = PointerBuf::from_tokens(["foo", "bar", "baz"]);
        assert_eq!(ptr.to_string(), "/foo/bar/baz");
    }

    #[test]
    fn last() {