pub fn as_authorities_change(&self) -> Option<&'a [AuthorityId]> {
		match *self {
			DigestItemRef::AuthoritiesChange(ref authorities) => Some(authorities),
			_ => None,
		}
	}
/// Cast this digest item into `AuthoritiesChange`.
Cast this digest item into `AuthoritiesChange`.
Cast this digest item into ` AuthoritiesChange ` .
pub fn as_authorities_change(&self) -> Option<&'a [AuthorityId]> {
		match *self {
			DigestItemRef::AuthoritiesChange(ref authorities) => Some(authorities),
			_ => None,
		}
	}
pub fn as_authorities_change ( & self ) -> Option < & ' a [ AuthorityId ] > { match * self { DigestItemRef :: AuthoritiesChange ( ref authorities ) => Some ( authorities ) , _ => None , } }
Cast this digest item into `AuthoritiesChange`.
Cast this digest item into ` AuthoritiesChange ` .
&self
&self