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diff --git a/src/vhdl/sem_utils.ads b/src/vhdl/sem_utils.ads
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+--  Semantic utilities.
+--  Copyright (C) 2018 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_Utils is
+   --  Compute and set the hash profile of a subprogram or enumeration clause.
+   procedure Compute_Subprogram_Hash (Subprg : Iir);
+
+   function Create_Anonymous_Interface
+     (Atype : Iir) return Iir_Interface_Constant_Declaration;
+
+   --  Create predefined operations for DECL.
+   procedure Create_Implicit_Operations
+     (Decl : Iir; Is_Std_Standard : Boolean := False);
+end Sem_Utils;