Attribute Macro logger 

#[logger]

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).

#[logger]
pub fn my_func(msg: &str){
    entering!();
    fine!("msg: {msg}");

    ...
}