> I feel like there should be a helper for simple parse operations.

> parse!("#{} @ {},{}: {}x{}", id, x, y, w, h);

> This would be a clean inverse of println!.

The text_io crate does this exactly.

https://crates.io/crates/text_io

    #[macro_use]
    extern crate text_io;

    fn main() {
        let id: u32;
        let x: u32;
        let y: u32;
        let w: u32;
        let h: u32;
        scan!("#{} @ {},{}: {}x{}", id, x, y, w, h);
    }