Macro traceln

macro_rules! traceln {
    (type=>$tp:expr, $($arg:tt)+) => { ... };
    (type=>$tp:expr) => { ... };
    ($($arg:tt)+) => { ... };
}

Trace macro like println

It uses format_args! for creating formatted string from passed arguments.

Prints with the following format: file!:line! - [type:] [Message]