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------------------------------------------------------------------------------

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                             P A R . C H 1 2                              --

--                                                                          --

--                                 B o d y                                  --

--                                                                          --

--          Copyright (C) 1992-2009, Free Software Foundation, Inc.         --

--                                                                          --

-- GNAT is free software;  you can  redistribute it  and/or modify it under --

-- terms of the  GNU General Public License as published  by the Free Soft- --

-- ware  Foundation;  either version 3,  or (at your option) any later ver- --

-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --

-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --

-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --

-- for  more details.  You should have  received  a copy of the GNU General --

-- Public License  distributed with GNAT; see file COPYING3.  If not, go to --

-- http://www.gnu.org/licenses for a complete copy of the license.          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

------------------------------------------------------------------------------

pragma Style_Checks (All_Checks);

--  Turn off subprogram body ordering check. Subprograms are in order

--  by RM section rather than alphabetical

separate (Par)

package body Ch12 is

   --  Local functions, used only in this chapter

   function P_Formal_Derived_Type_Definition           return Node_Id;

   function P_Formal_Discrete_Type_Definition          return Node_Id;

   function P_Formal_Fixed_Point_Definition            return Node_Id;

   function P_Formal_Floating_Point_Definition         return Node_Id;

   function P_Formal_Modular_Type_Definition           return Node_Id;

   function P_Formal_Package_Declaration               return Node_Id;

   function P_Formal_Private_Type_Definition           return Node_Id;

   function P_Formal_Signed_Integer_Type_Definition    return Node_Id;

   function P_Formal_Subprogram_Declaration            return Node_Id;

   function P_Formal_Type_Declaration                  return Node_Id;

   function P_Formal_Type_Definition                   return Node_Id;

   function P_Generic_Association                      return Node_Id;

   procedure P_Formal_Object_Declarations (Decls : List_Id);

   --  Scans one or more formal object declarations and appends them to

   --  Decls. Scans more than one declaration only in the case where the

   --  source has a declaration with multiple defining identifiers.

   --------------------------------

   -- 12.1  Generic (also 8.5.5) --

   --------------------------------

   --  This routine parses either one of the forms of a generic declaration

   --  or a generic renaming declaration.

   --  GENERIC_DECLARATION ::=

   --    GENERIC_SUBPROGRAM_DECLARATION | GENERIC_PACKAGE_DECLARATION

   --  GENERIC_SUBPROGRAM_DECLARATION ::=

   --    GENERIC_FORMAL_PART SUBPROGRAM_SPECIFICATION;

   --  GENERIC_PACKAGE_DECLARATION ::=

   --    GENERIC_FORMAL_PART PACKAGE_SPECIFICATION;

   --  GENERIC_FORMAL_PART ::=

   --    generic {GENERIC_FORMAL_PARAMETER_DECLARATION | USE_CLAUSE}

   --  GENERIC_RENAMING_DECLARATION ::=

   --    generic package DEFINING_PROGRAM_UNIT_NAME

   --      renames generic_package_NAME

   --  | generic procedure DEFINING_PROGRAM_UNIT_NAME

   --      renames generic_procedure_NAME

   --  | generic function DEFINING_PROGRAM_UNIT_NAME

   --      renames generic_function_NAME

   --  GENERIC_FORMAL_PARAMETER_DECLARATION ::=

   --    FORMAL_OBJECT_DECLARATION

   --  | FORMAL_TYPE_DECLARATION

   --  | FORMAL_SUBPROGRAM_DECLARATION

   --  | FORMAL_PACKAGE_DECLARATION

   --  The caller has checked that the initial token is GENERIC

   --  Error recovery: can raise Error_Resync

   function P_Generic return Node_Id is

      Gen_Sloc   : constant Source_Ptr := Token_Ptr;

      Gen_Decl   : Node_Id;

      Decl_Node  : Node_Id;

      Decls      : List_Id;

      Def_Unit   : Node_Id;

      Ren_Token  : Token_Type;

      Scan_State : Saved_Scan_State;

   begin

      Scan; -- past GENERIC

      if Token = Tok_Private then

         Error_Msg_SC -- CODEFIX

           ("PRIVATE goes before GENERIC, not after");

         Scan; -- past junk PRIVATE token

      end if;

      Save_Scan_State (Scan_State); -- at token past GENERIC

      --  Check for generic renaming declaration case

      if Token = Tok_Package

        or else Token = Tok_Function

        or else Token = Tok_Procedure

      then

         Ren_Token := Token;

         Scan; -- scan past PACKAGE, FUNCTION or PROCEDURE

         if Token = Tok_Identifier then

            Def_Unit := P_Defining_Program_Unit_Name;

            Check_Misspelling_Of (Tok_Renames);

            if Token = Tok_Renames then

               if Ren_Token = Tok_Package then

                  Decl_Node := New_Node

                    (N_Generic_Package_Renaming_Declaration, Gen_Sloc);

               elsif Ren_Token = Tok_Procedure then

                  Decl_Node := New_Node

                    (N_Generic_Procedure_Renaming_Declaration, Gen_Sloc);

               else -- Ren_Token = Tok_Function then

                  Decl_Node := New_Node

                    (N_Generic_Function_Renaming_Declaration, Gen_Sloc);

               end if;

               Scan; -- past RENAMES

               Set_Defining_Unit_Name (Decl_Node, Def_Unit);

               Set_Name (Decl_Node, P_Name);

               TF_Semicolon;

               return Decl_Node;

            end if;

         end if;

      end if;

      --  Fall through if this is *not* a generic renaming declaration

      Restore_Scan_State (Scan_State);

      Decls := New_List;

      --  Loop through generic parameter declarations and use clauses

      Decl_Loop : loop

         P_Pragmas_Opt (Decls);

         if Token = Tok_Private then

            Error_Msg_S ("generic private child packages not permitted");

            Scan; -- past PRIVATE

         end if;

         if Token = Tok_Use then

            Append (P_Use_Clause, Decls);

         else

            --  Parse a generic parameter declaration

            if Token = Tok_Identifier then

               P_Formal_Object_Declarations (Decls);

            elsif Token = Tok_Type then

               Append (P_Formal_Type_Declaration, Decls);

            elsif Token = Tok_With then

               Scan; -- past WITH

               if Token = Tok_Package then

                  Append (P_Formal_Package_Declaration, Decls);

               elsif Token = Tok_Procedure or Token = Tok_Function then

                  Append (P_Formal_Subprogram_Declaration, Decls);

               else

                  Error_Msg_BC -- CODEFIX

                    ("FUNCTION, PROCEDURE or PACKAGE expected here");

                  Resync_Past_Semicolon;

               end if;

            elsif Token = Tok_Subtype then

               Error_Msg_SC ("subtype declaration not allowed " &

                                "as generic parameter declaration!");

               Resync_Past_Semicolon;

            else

               exit Decl_Loop;

            end if;

         end if;

      end loop Decl_Loop;

      --  Generic formal part is scanned, scan out subprogram or package spec

      if Token = Tok_Package then

         Gen_Decl := New_Node (N_Generic_Package_Declaration, Gen_Sloc);

         Set_Specification (Gen_Decl, P_Package (Pf_Spcn));

      else

         Gen_Decl := New_Node (N_Generic_Subprogram_Declaration, Gen_Sloc);

         Set_Specification (Gen_Decl, P_Subprogram_Specification);

         if Nkind (Defining_Unit_Name (Specification (Gen_Decl))) =

                                             N_Defining_Program_Unit_Name

           and then Scope.Last > 0

         then

            Error_Msg_SP ("child unit allowed only at library level");

         end if;

         TF_Semicolon;

      end if;

      Set_Generic_Formal_Declarations (Gen_Decl, Decls);

      return Gen_Decl;

   end P_Generic;

   -------------------------------

   -- 12.1  Generic Declaration --

   -------------------------------

   --  Parsed by P_Generic (12.1)

   ------------------------------------------

   -- 12.1  Generic Subprogram Declaration --

   ------------------------------------------

   --  Parsed by P_Generic (12.1)

   ---------------------------------------

   -- 12.1  Generic Package Declaration --

   ---------------------------------------

   --  Parsed by P_Generic (12.1)

   -------------------------------

   -- 12.1  Generic Formal Part --

   -------------------------------

   --  Parsed by P_Generic (12.1)

   -------------------------------------------------

   -- 12.1   Generic Formal Parameter Declaration --

   -------------------------------------------------

   --  Parsed by P_Generic (12.1)

   ---------------------------------

   -- 12.3  Generic Instantiation --

   ---------------------------------

   --  Generic package instantiation parsed by P_Package (7.1)

   --  Generic procedure instantiation parsed by P_Subprogram (6.1)

   --  Generic function instantiation parsed by P_Subprogram (6.1)

   -------------------------------

   -- 12.3  Generic Actual Part --

   -------------------------------

   --  GENERIC_ACTUAL_PART ::=

   --    (GENERIC_ASSOCIATION {, GENERIC_ASSOCIATION})

   --  Returns a list of generic associations, or Empty if none are present

   --  Error recovery: cannot raise Error_Resync

   function P_Generic_Actual_Part_Opt return List_Id is

      Association_List : List_Id;

   begin

      --  Figure out if a generic actual part operation is present. Clearly

      --  there is no generic actual part if the current token is semicolon

      if Token = Tok_Semicolon then

         return No_List;

      --  If we don't have a left paren, then we have an error, and the job

      --  is to figure out whether a left paren or semicolon was intended.

      --  We assume a missing left paren (and hence a generic actual part

      --  present) if the current token is not on a new line, or if it is

      --  indented from the subprogram token. Otherwise assume missing

      --  semicolon (which will be diagnosed by caller) and no generic part

      elsif Token /= Tok_Left_Paren

        and then Token_Is_At_Start_Of_Line

        and then Start_Column <= Scope.Table (Scope.Last).Ecol

      then

         return No_List;

      --  Otherwise we have a generic actual part (either a left paren is

      --  present, or we have decided that there must be a missing left paren)

      else

         Association_List := New_List;

         T_Left_Paren;

         loop

            Append (P_Generic_Association, Association_List);

            exit when not Comma_Present;

         end loop;

         T_Right_Paren;

         return Association_List;

      end if;

   end P_Generic_Actual_Part_Opt;

   -------------------------------

   -- 12.3  Generic Association --

   -------------------------------

   --  GENERIC_ASSOCIATION ::=

   --    [generic_formal_parameter_SELECTOR_NAME =>]

   --      EXPLICIT_GENERIC_ACTUAL_PARAMETER

   --  EXPLICIT_GENERIC_ACTUAL_PARAMETER ::=

   --    EXPRESSION      | variable_NAME   | subprogram_NAME

   --  | entry_NAME      | SUBTYPE_MARK    | package_instance_NAME

   --  Error recovery: cannot raise Error_Resync

   function P_Generic_Association return Node_Id is

      Scan_State         : Saved_Scan_State;

      Param_Name_Node    : Node_Id;

      Generic_Assoc_Node : Node_Id;

   begin

      Generic_Assoc_Node := New_Node (N_Generic_Association, Token_Ptr);

      --  Ada2005: an association can be given by: others => <>

      if Token = Tok_Others then

         if Ada_Version < Ada_05 then

            Error_Msg_SP

              ("partial parametrization of formal packages" &

                " is an Ada 2005 extension");

            Error_Msg_SP

              ("\unit must be compiled with -gnat05 switch");

         end if;

         Scan;  --  past OTHERS

         if Token /= Tok_Arrow then

            Error_Msg_BC ("expect arrow after others");

         else

            Scan;  --  past arrow

         end if;

         if Token /= Tok_Box then

            Error_Msg_BC ("expect Box after arrow");

         else

            Scan;  --  past box

         end if;

         --  Source position of the others choice is beginning of construct

         return New_Node (N_Others_Choice, Sloc (Generic_Assoc_Node));

      end if;

      if Token in Token_Class_Desig then

         Param_Name_Node := Token_Node;

         Save_Scan_State (Scan_State); -- at designator

         Scan; -- past simple name or operator symbol

         if Token = Tok_Arrow then

            Scan; -- past arrow

            Set_Selector_Name (Generic_Assoc_Node, Param_Name_Node);

         else

            Restore_Scan_State (Scan_State); -- to designator

         end if;

      end if;

      --  In Ada 2005 the actual can be a box

      if Token = Tok_Box then

         Scan;

         Set_Box_Present (Generic_Assoc_Node);

         Set_Explicit_Generic_Actual_Parameter (Generic_Assoc_Node, Empty);

      else

         Set_Explicit_Generic_Actual_Parameter

           (Generic_Assoc_Node, P_Expression);

      end if;

      return Generic_Assoc_Node;

   end P_Generic_Association;

   ---------------------------------------------

   -- 12.3  Explicit Generic Actual Parameter --

   ---------------------------------------------

   --  Parsed by P_Generic_Association (12.3)

   --------------------------------------

   -- 12.4  Formal Object Declarations --

   --------------------------------------

   --  FORMAL_OBJECT_DECLARATION ::=

   --    DEFINING_IDENTIFIER_LIST :

   --      MODE [NULL_EXCLUSION] SUBTYPE_MARK [:= DEFAULT_EXPRESSION];

   --  | DEFINING_IDENTIFIER_LIST :

   --      MODE ACCESS_DEFINITION [:= DEFAULT_EXPRESSION];

   --  The caller has checked that the initial token is an identifier

   --  Error recovery: cannot raise Error_Resync

   procedure P_Formal_Object_Declarations (Decls : List_Id) is

      Decl_Node        : Node_Id;

      Ident            : Nat;

      Not_Null_Present : Boolean := False;

      Num_Idents       : Nat;

      Scan_State       : Saved_Scan_State;

      Idents : array (Int range 1 .. 4096) of Entity_Id;

      --  This array holds the list of defining identifiers. The upper bound

      --  of 4096 is intended to be essentially infinite, and we do not even

      --  bother to check for it being exceeded.

   begin

      Idents (1) := P_Defining_Identifier (C_Comma_Colon);

      Num_Idents := 1;

      while Comma_Present loop

         Num_Idents := Num_Idents + 1;

         Idents (Num_Idents) := P_Defining_Identifier (C_Comma_Colon);

      end loop;

      T_Colon;

      --  If there are multiple identifiers, we repeatedly scan the

      --  type and initialization expression information by resetting

      --  the scan pointer (so that we get completely separate trees

      --  for each occurrence).

      if Num_Idents > 1 then

         Save_Scan_State (Scan_State);

      end if;

      --  Loop through defining identifiers in list

      Ident := 1;

      Ident_Loop : loop

         Decl_Node := New_Node (N_Formal_Object_Declaration, Token_Ptr);

         Set_Defining_Identifier (Decl_Node, Idents (Ident));

         P_Mode (Decl_Node);

         Not_Null_Present := P_Null_Exclusion;  --  Ada 2005 (AI-423)

         --  Ada 2005 (AI-423): Formal object with an access definition

         if Token = Tok_Access then

            --  The access definition is still parsed and set even though

            --  the compilation may not use the proper switch. This action

            --  ensures the required local error recovery.

            Set_Access_Definition (Decl_Node,

              P_Access_Definition (Not_Null_Present));

            if Ada_Version < Ada_05 then

               Error_Msg_SP

                 ("access definition not allowed in formal object " &

                  "declaration");

               Error_Msg_SP ("\unit must be compiled with -gnat05 switch");

            end if;

         --  Formal object with a subtype mark

         else

            Set_Null_Exclusion_Present (Decl_Node, Not_Null_Present);

            Set_Subtype_Mark (Decl_Node, P_Subtype_Mark_Resync);

         end if;

         No_Constraint;

         Set_Default_Expression (Decl_Node, Init_Expr_Opt);

         if Ident > 1 then

            Set_Prev_Ids (Decl_Node, True);

         end if;

         if Ident < Num_Idents then

            Set_More_Ids (Decl_Node, True);

         end if;

         Append (Decl_Node, Decls);

         exit Ident_Loop when Ident = Num_Idents;

         Ident := Ident + 1;

         Restore_Scan_State (Scan_State);

      end loop Ident_Loop;

      TF_Semicolon;

   end P_Formal_Object_Declarations;

   -----------------------------------

   -- 12.5  Formal Type Declaration --

   -----------------------------------

   --  FORMAL_TYPE_DECLARATION ::=

   --    type DEFINING_IDENTIFIER [DISCRIMINANT_PART]

   --      is FORMAL_TYPE_DEFINITION;

   --  The caller has checked that the initial token is TYPE

   --  Error recovery: cannot raise Error_Resync

   function P_Formal_Type_Declaration return Node_Id is

      Decl_Node  : Node_Id;

      Def_Node   : Node_Id;

   begin

      Decl_Node := New_Node (N_Formal_Type_Declaration, Token_Ptr);

      Scan; -- past TYPE

      Set_Defining_Identifier (Decl_Node, P_Defining_Identifier);

      if P_Unknown_Discriminant_Part_Opt then

         Set_Unknown_Discriminants_Present (Decl_Node, True);

      else

         Set_Discriminant_Specifications

           (Decl_Node, P_Known_Discriminant_Part_Opt);

      end if;

      T_Is;

      Def_Node := P_Formal_Type_Definition;

      if Def_Node /= Error then

         Set_Formal_Type_Definition (Decl_Node, Def_Node);

         TF_Semicolon;

      else

         Decl_Node := Error;

         --  If we have semicolon, skip it to avoid cascaded errors

         if Token = Tok_Semicolon then

            Scan;

         end if;

      end if;

      return Decl_Node;

   end P_Formal_Type_Declaration;

   ----------------------------------

   -- 12.5  Formal Type Definition --

   ----------------------------------

   --  FORMAL_TYPE_DEFINITION ::=

   --    FORMAL_PRIVATE_TYPE_DEFINITION

   --  | FORMAL_DERIVED_TYPE_DEFINITION

   --  | FORMAL_DISCRETE_TYPE_DEFINITION

   --  | FORMAL_SIGNED_INTEGER_TYPE_DEFINITION

   --  | FORMAL_MODULAR_TYPE_DEFINITION

   --  | FORMAL_FLOATING_POINT_DEFINITION

   --  | FORMAL_ORDINARY_FIXED_POINT_DEFINITION

   --  | FORMAL_DECIMAL_FIXED_POINT_DEFINITION

   --  | FORMAL_ARRAY_TYPE_DEFINITION

   --  | FORMAL_ACCESS_TYPE_DEFINITION

   --  | FORMAL_INTERFACE_TYPE_DEFINITION

   --  FORMAL_ARRAY_TYPE_DEFINITION ::= ARRAY_TYPE_DEFINITION

   --  FORMAL_ACCESS_TYPE_DEFINITION ::= ACCESS_TYPE_DEFINITION

   --  FORMAL_INTERFACE_TYPE_DEFINITION ::= INTERFACE_TYPE_DEFINITION

   function P_Formal_Type_Definition return Node_Id is

      Scan_State   : Saved_Scan_State;

      Typedef_Node : Node_Id;

   begin

      if Token_Name = Name_Abstract then

         Check_95_Keyword (Tok_Abstract, Tok_Tagged);

      end if;

      if Token_Name = Name_Tagged then

         Check_95_Keyword (Tok_Tagged, Tok_Private);

         Check_95_Keyword (Tok_Tagged, Tok_Limited);

      end if;

      case Token is

         --  Mostly we can tell what we have from the initial token. The one

         --  exception is ABSTRACT, where we have to scan ahead to see if we

         --  have a formal derived type or a formal private type definition.

         --  In addition, in Ada 2005 LIMITED may appear after abstract, so

         --  that the lookahead must be extended by one more token.

         when Tok_Abstract =>

            Save_Scan_State (Scan_State);

            Scan; -- past ABSTRACT

            if Token = Tok_New then

               Restore_Scan_State (Scan_State); -- to ABSTRACT

               return P_Formal_Derived_Type_Definition;

            elsif Token = Tok_Limited then

               Scan;  --  past LIMITED

               if Token = Tok_New then

                  Restore_Scan_State (Scan_State); -- to ABSTRACT

                  return P_Formal_Derived_Type_Definition;

               else

                  Restore_Scan_State (Scan_State); -- to ABSTRACT

                  return P_Formal_Private_Type_Definition;

               end if;

            --  Ada 2005 (AI-443): Abstract synchronized formal derived type

            elsif Token = Tok_Synchronized then

               Restore_Scan_State (Scan_State); -- to ABSTRACT

               return P_Formal_Derived_Type_Definition;

            else

               Restore_Scan_State (Scan_State); -- to ABSTRACT

               return P_Formal_Private_Type_Definition;

            end if;

         when Tok_Access =>

            return P_Access_Type_Definition;

         when Tok_Array =>

            return P_Array_Type_Definition;

         when Tok_Delta =>

            return P_Formal_Fixed_Point_Definition;

         when Tok_Digits =>

            return P_Formal_Floating_Point_Definition;

         when Tok_Interface => --  Ada 2005 (AI-251)

            return P_Interface_Type_Definition (Abstract_Present => False);

         when Tok_Left_Paren =>

            return P_Formal_Discrete_Type_Definition;

         when Tok_Limited =>

            Save_Scan_State (Scan_State);

            Scan; --  past LIMITED

            if Token = Tok_Interface then

               Typedef_Node :=

                 P_Interface_Type_Definition (Abstract_Present => False);

               Set_Limited_Present (Typedef_Node);

               return Typedef_Node;

            elsif Token = Tok_New then

               Restore_Scan_State (Scan_State); -- to LIMITED

               return P_Formal_Derived_Type_Definition;

            else

               if Token = Tok_Abstract then

                  Error_Msg_SC -- CODEFIX

                    ("ABSTRACT must come before LIMITED");

                  Scan;  --  past improper ABSTRACT

                  if Token = Tok_New then

                     Restore_Scan_State (Scan_State); -- to LIMITED

                     return P_Formal_Derived_Type_Definition;

                  else

                     Restore_Scan_State (Scan_State);

                     return P_Formal_Private_Type_Definition;

                  end if;

               end if;

               Restore_Scan_State (Scan_State);

               return P_Formal_Private_Type_Definition;

            end if;

         when Tok_Mod =>

            return P_Formal_Modular_Type_Definition;

         when Tok_New =>

            return P_Formal_Derived_Type_Definition;

         when Tok_Not =>

            if P_Null_Exclusion then

               Typedef_Node :=  P_Access_Type_Definition;

               Set_Null_Exclusion_Present (Typedef_Node);

               return Typedef_Node;

            else

               Error_Msg_SC ("expect valid formal access definition!");

               Resync_Past_Semicolon;

               return Error;

            end if;

         when Tok_Private |

              Tok_Tagged  =>

            return P_Formal_Private_Type_Definition;

         when Tok_Range =>

            return P_Formal_Signed_Integer_Type_Definition;

         when Tok_Record =>

            Error_Msg_SC ("record not allowed in generic type definition!");

            Discard_Junk_Node (P_Record_Definition);

            return Error;

         --  Ada 2005 (AI-345): Task, Protected or Synchronized interface or

         --  (AI-443): Synchronized formal derived type declaration.

         when Tok_Protected    |

              Tok_Synchronized |

              Tok_Task         =>

            declare

               Saved_Token : constant Token_Type := Token;

            begin

               Scan; -- past TASK, PROTECTED or SYNCHRONIZED

               --  Synchronized derived type

               if Token = Tok_New then

                  Typedef_Node := P_Formal_Derived_Type_Definition;

                  if Saved_Token = Tok_Synchronized then

                     Set_Synchronized_Present (Typedef_Node);

                  else

                     Error_Msg_SC ("invalid kind of formal derived type");

                  end if;

               --  Interface

               else

                  Typedef_Node :=

                    P_Interface_Type_Definition (Abstract_Present => False);

                  case Saved_Token is

                     when Tok_Task =>

                        Set_Task_Present         (Typedef_Node);

                     when Tok_Protected =>

                        Set_Protected_Present    (Typedef_Node);

                     when Tok_Synchronized =>

                        Set_Synchronized_Present (Typedef_Node);

                     when others =>

                        null;

                  end case;

               end if;

               return Typedef_Node;

            end;

         when others =>

            Error_Msg_BC ("expecting generic type definition here");

            Resync_Past_Semicolon;

            return Error;

      end case;

   end P_Formal_Type_Definition;

   --------------------------------------------

   -- 12.5.1  Formal Private Type Definition --

   --------------------------------------------

   --  FORMAL_PRIVATE_TYPE_DEFINITION ::=

   --    [[abstract] tagged] [limited] private

   --  The caller has checked the initial token is PRIVATE, ABSTRACT,

   --   TAGGED or LIMITED

   --  Error recovery: cannot raise Error_Resync

   function P_Formal_Private_Type_Definition return Node_Id is

      Def_Node : Node_Id;

   begin

      Def_Node := New_Node (N_Formal_Private_Type_Definition, Token_Ptr);

      if Token = Tok_Abstract then

         Scan; -- past ABSTRACT

         if Token_Name = Name_Tagged then

            Check_95_Keyword (Tok_Tagged, Tok_Private);

            Check_95_Keyword (Tok_Tagged, Tok_Limited);

         end if;

         if Token /= Tok_Tagged then

            Error_Msg_SP ("ABSTRACT must be followed by TAGGED");

         else

            Set_Abstract_Present (Def_Node, True);

         end if;

      end if;

      if Token = Tok_Tagged then

         Set_Tagged_Present (Def_Node, True);

         Scan; -- past TAGGED

      end if;

      if Token = Tok_Limited then

         Set_Limited_Present (Def_Node, True);

         Scan; -- past LIMITED

      end if;

      if Token = Tok_Abstract then

         if Prev_Token = Tok_Tagged then

            Error_Msg_SC -- CODEFIX

              ("ABSTRACT must come before TAGGED");

         elsif Prev_Token = Tok_Limited then

            Error_Msg_SC -- CODEFIX

              ("ABSTRACT must come before LIMITED");

         end if;