Function `set_default`

#[must_use = "Dropping the guard unregisters the subscriber."]
pub fn set_default<S>(subscriber: S) -> DefaultGuard
where
    S: Subscriber + Send + Sync + 'static,

Sets the Subscriber as the default for the current thread for the duration of the lifetime of the returned DefaultGuard.

The default subscriber is used when creating a new Span or Event.