Function get_system_user_pair 

pub(crate) fn get_system_user_pair(
    mapping: &ExtendedUserMapping,
) -> Result<(SystemUserId, User), Error>

Returns a SystemUserId and matching Unix system [User] associated with it.

Errors

Returns an error if

• there is no SystemUserId in the mapping,
• or no [User] data can be retrieved from a found SystemUserId.