+ [user, _] =>
+ let
+ fun parseFields fields =
+ case fields of
+ "mail" :: mailbox :: _ => loop ({user = user, mailbox = mailbox} :: users)
+ | _ :: _ :: rest => parseFields rest
+ | _ => Error "Invalid fields in database"
+ in
+ parseFields (String.fields (fn ch => ch = #"|" orelse ch = #"=") fields)
+ end