Function tokio_trace_core::dispatcher::with_default

pub fn with_default<T>(dispatcher: &Dispatch, f: impl FnOnce() -> T) -> T

Sets this dispatch as the default for the duration of a closure.

The default dispatcher is used when creating a new span or Event, if no span is currently executing. If a span is currently executing, new spans or events are dispatched to the subscriber that tagged that span, instead.