indexing description: "Error for empty target list in cluster option."; date: "$Date$"; revision: "$Revision $" class VD39 inherit CLUSTER_ERROR feature -- Property option_name: STRING; feature -- Output build_explain (st: STRUCTURED_TEXT) is do put_cluster_name (st); st.add_string ("Option: "); st.add_string (option_name); st.add_new_line end; feature {O_OPTION_SD} -- Setting set_option_name (s: STRING) is do option_name := s; end; end -- class VD39