anchor.diff:      try
           ec_dictionary:get({Name, Vsn}, rlx_state:realized_releases(State))
       catch
  -        throw:notfound ->
  +        throw:not_found ->
               undefined
       end.
   
  
positive.code:         end,
      case UpFrom of
          undefined ->
              ?RLX_ERROR(no_upfrom_release_found);
          _ ->
              make_upfrom_script(State, Release, UpFrom)
      end.
  
negative.code: format_error({relup_generation_warning, Module, Warnings}) ->
      ["Warnings generating relup \s",
       rlx_util:indent(2), Module:format_warning(Warnings)];
  format_error({no_upfrom_release_found, undefined}) ->
      io_lib:format("No earlier release for relup found", []);
  format_error({no_upfrom_release_found, Vsn}) ->
      io_lib:format("Upfrom release version (~s) for relup not found", [Vsn]);
  format_error({relup_script_generation_error,
                {relup_script_generation_error, systools_relup,
                 {missing_sasl, _}}}) ->
  