Hi, do you know how to make a function returning a tower service builder?

[HaoliangXu]

https://github.com/SaadiSave/zero2prod/blob/main/src/startup.rs
in this file, I feel that putting this trunk of code in Axum runner function is to noisy, makes it hard to read, so I like the idea of leaving the service builder in another function
but making another function has its own problem, how to put the right return type on the function signature?

[SaadiSave]

You can return the ServiceBuilder from the function. The return type should be something like impl Service<...>.

[HaoliangXu]

I ended up with this mess as the return type:

ServiceBuilder<
    Stack<
        PropagateRequestIdLayer,
        Stack<
            TraceLayer<SharedClassifier<ServerErrorsAsFailures>>,
            Stack<SetRequestIdLayer<MakeRequestUuid>, Identity>,
        >,
    >,
>

don't know whether there's any way better than this