Compile Errors in Rust

Diesel is an ORM for the database in Rust. I'm assuming diesel uses a bunch of like procedural macros somehow to generate stuff that seems like kind of the, what I would do if I were doing an ORM in Rust. So does it do that inside the proc macros or how does that work? Ooh, that's a good question. At what point does it connect to the database? Like for example, if I don't have my database running, can I still build my program or is it like you run a command to like sync them up or? Right. Yes. That's not really what we're talking about here. Actually, I think that's kind of