anchor.diff:    ?wrangler_io("\nCMD: ~p:tuple_funpar(~p, ~p, ~p, ~p,~p, ~p).\n", 
               [?MODULE,FileName, ParLine, ParCol, Number, SearchPaths, TabWidth]),
   	{ok, {AnnAST, Info}} = parse_file(FileName, SearchPaths, TabWidth),
  +    case Number of 
  +	1 -> throw({error, "Tupling one argument is not supported."});
  +	_ ->ok
  +    end,    
       case check_first_pos({ParLine, ParCol}, AnnAST) of 
   	{error, Reason} -> {error, Reason};
   	{FirstPar, Type} ->
  
positive.code:       Fun = refac_syntax:arity_qualifier_body(Tree),
        Fun_Name = refac_syntax:atom_value(Fun),
        Arg = refac_syntax:arity_qualifier_argument(Tree),
        Arg1 = refac_syntax:atom_value(Arg),
        DefMod = get_fun_def_mod(Fun),
        if (Fun_Name == Name) and (Arg1 == Arity) and (DefMod == Mod) ->
          {refac_syntax:copy_attrs(Tree, refac_syntax:arity_qualifier(Fun, 
  
negative.code: 		  FName = refac_syntax:implicit_fun_name(Fun),
  		  B = refac_syntax:atom_value(refac_syntax:
  					      arity_qualifier_body(FName)),
  		  A = refac_syntax:integer_value(refac_syntax:
  					      arity_qualifier_argument(FName)),
  		  case {B, A} of
  		      {Name, Arity} ->
  