Macro loggy::note

macro_rules! note {
    ( $is_error:expr, $( $arg:tt )* ) => { ... };
}

Log either an error or a warning, depending on some configuration parameter.

Invoking note!(is_error, ...) is identical to invoking error!(...) if is_error is true, or warn!(...) if is_error is false. This allows easily handling conditions whose handling depends on command line arguments or other considerations.