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diff --git a/src/synth/netlists-internings.adb b/src/synth/netlists-internings.adb
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+++ b/src/synth/netlists-internings.adb
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+--  Simple interning for netlist elements.
+--  Copyright (C) 2019 Tristan Gingold
+--
+--  This file is part of GHDL.
+--
+--  This program 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 of the License, or
+--  (at your option) any later version.
+--
+--  This program 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 this program; if not, write to the Free Software
+--  Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+--  MA 02110-1301, USA.
+
+package body Netlists.Internings is
+   function Id_Instance (Param : Instance) return Instance is
+   begin
+      return Param;
+   end Id_Instance;
+end Netlists.Internings;