Macro timed

macro_rules! timed {
    ( ($($arg:tt)*), $body:block ) => { ... };
    ( $msg:literal, $body:block ) => { ... };
    ( $level:expr, ($($arg:tt)*), $body:block ) => { ... };
    ( $level:expr, $msg:literal, $body:block ) => { ... };
    ( $level:expr, $msg:expr, $body:block ) => { ... };
}