Function optional
fn optional<S: serde::Serializer>(span: &Option<crate::Span>, se: S) -> Result<<S as >::Ok, <S as >::Error>Serialize an optional Span in the friendly duration
format using compact designators.
optionalfn optional<S: serde::Serializer>(span: &Option<crate::Span>, se: S) -> Result<<S as >::Ok, <S as >::Error>Serialize an optional Span in the friendly duration
format using compact designators.