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diff --git a/src/vhdl/sem_decls.ads b/src/vhdl/sem_decls.ads
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+--  Semantic analysis.
+--  Copyright (C) 2002, 2003, 2004, 2005 Tristan Gingold
+--
+--  GHDL is free software; you can redistribute it and/or modify it under
+--  the terms of the GNU General Public License as published by the Free
+--  Software Foundation; either version 2, or (at your option) any later
+--  version.
+--
+--  GHDL is distributed in the hope that it will be useful, but WITHOUT 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
+--  along with GHDL; see the file COPYING.  If not, write to the Free
+--  Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+--  02111-1307, USA.
+with Iirs; use Iirs;
+
+package Sem_Decls is
+   procedure Sem_Interface_Chain (Interface_Chain: Iir;
+                                  Interface_Kind : Interface_Kind_Type);
+
+   --  Create predefined operations for DECL.
+   procedure Create_Implicit_Operations
+     (Decl : Iir; Is_Std_Standard : Boolean := False);
+
+   --  Semantize declarations of PARENT.
+   procedure Sem_Declaration_Chain (Parent : Iir);
+
+   --  Check all declarations of DECLS_PARENT are complete
+   --  This checks subprograms, deferred constants, incomplete types and
+   --  protected types.
+   --
+   --  DECL is the declaration that contains the declaration_list DECLS_PARENT.
+   --  (location of errors).
+   --  DECL is different from DECLS_PARENT for package bodies and protected
+   --  type bodies.
+   --
+   --  Also, report unused declarations if DECL = DECLS_PARENT.
+   --  As a consequence, Check_Full_Declaration must be called after sem
+   --  of statements, if any.
+   procedure Check_Full_Declaration (Decls_Parent : Iir; Decl: Iir);
+
+   procedure Sem_Iterator (Iterator : Iir_Iterator_Declaration;
+                           Staticness : Iir_Staticness);
+
+   --  Extract from NAME the named entity whose profile matches SIG.  If NAME
+   --  is an overload list, it is destroyed.
+   function Sem_Signature (Name : Iir; Sig : Iir_Signature) return Iir;
+
+end Sem_Decls;