The only parts of this that I (as someone who has dabbled in rust, but barely interacted with explicit lifetimes, ever) am confused by is

"&()".

And I assume it is similar to some kind of implicit capture group in cpp ("[&]") and "`_", which is a lifetime of some kind. I don't know what the "use" keyword does, but it's not a sigil, and "->", "impl Sized", and "{"/"}" are all fairly self-explanatory.

I will say https://doc.rust-lang.org/edition-guide/rust-2024/rpit-lifet... does not answer any of my questions and only creates more.