Rust's dbg! macro is better than println! for debugging

The dbg! macro is fantastic for quick debugging because it:

1. Shows the expression itself, not just the value
2. Prints the file and line number
3. Returns the value, so you can use it inline

let x = 5;
let y = dbg!(x * 2);  // Prints: [src/main.rs:3] x * 2 = 10
// y is now 10

Compare this to println!:

let x = 5;
println!("{}", x * 2);  // Prints: 10
// You have to know what this value represents

The dbg! approach is especially useful when debugging expressions in the middle of a chain:

let result = values
    .iter()
    .map(|x| dbg!(x * 2))  // See each multiplication
    .filter(|x| dbg!(x > &5))  // See each filter decision
    .sum::<i32>();

Just remember to remove dbg! calls before committing — they’re meant for development only!