macro_rules! span { (target: $target:expr, $lvl:expr, $name:expr, $($fields:tt)*) => { ... }; (target: $target:expr, $lvl:expr, $name:expr) => { ... }; ($lvl:expr, $name:expr, $($fields:tt)*) => { ... }; ($lvl:expr, $name:expr) => { ... }; }
Available on crate feature
tracing
only.Expand description
A macro to create a span.