Neat! When working with Options/Results/Iterators, you can use `.map` [1] for exactly this purpose. It would sometimes be convenient to have something like `.map` / `.let` on unwrapped values as well.

[1] https://doc.rust-lang.org/std/option/enum.Option.html#method..., https://doc.rust-lang.org/std/result/enum.Result.html#method..., https://doc.rust-lang.org/std/iter/trait.Iterator.html#metho...

Note that in Rust, `.match` would itself provide the general way:

    let number = foo.bar().baz().match { it =>
        it + 1
    };