Output: debug

fn main() {
    const total = 40 * 3
    debug(total)
    print("done")
}

done

Only done shows above, because debug writes to standard error, not standard output. In a terminal you see both: the debug line names the file and line it came from, so you know which debug printed it.

Why not just print?

debug needs no capability, so you can drop it into any function. And kavach build leaves it out completely, argument and all: a forgotten debug never reaches your users.