Explain (Part 2)

Now the next part of the code:

#[logger]
fn do_something() {
    entering!();

    // do some work worth noting
    let result = "Just something to log.";
    info!("Did some work here.\n  {result}");

    // ...

    fine!("Bit more detail.");

    if let Err(e) = error_prone() {
        warning!("Error: {}", e);
    }

    exiting!();
}

Firstly, the attribute macro: logger.

The API says:

Provides for logging within the attributed function/method.

This is required to be able to use the macros. It sets up the local variable used by
the other macros, and it also registers the function/method name used by the log
entries (if included in the formatter’s 'fmt_string').

This is what handles all of the repetitive coding needed for each of the logged functions/methods.