Function tracing::dispatcher::with_default

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

This is supported on crate feature std only.

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

The default dispatcher is used when creating a new span or Event.

Note: This function required the Rust standard library.
no_std users should use 
set_global_default instead.