Macro gix_trace::coarse

macro_rules! coarse {
    (target: $target:expr, $name:expr, $($field:tt)*) => { ... };
    (target: $target:expr, $name:expr) => { ... };
    ($name:expr, $($field:tt)*) => { ... };
    ($name:expr) => { ... };
}

Create a new coarse span.