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diff --git a/src/synth/elab-vhdl_types.ads b/src/synth/elab-vhdl_types.ads
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+++ b/src/synth/elab-vhdl_types.ads
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+--  Create declarations for synthesis.
+--  Copyright (C) 2017 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, see <gnu.org/licenses>.
+
+with Vhdl.Nodes; use Vhdl.Nodes;
+
+with Elab.Vhdl_Context; use Elab.Vhdl_Context;
+with Elab.Vhdl_Objtypes; use Elab.Vhdl_Objtypes;
+
+package Elab.Vhdl_Types is
+   --  Get the type of DECL iff it is standalone (not an already existing
+   --  subtype).
+   function Get_Declaration_Type (Decl : Node) return Node;
+
+   --  True if the element subtype indication of ATYPE needs to be created.
+   function Has_Element_Subtype_Indication (Atype : Node) return Boolean;
+
+   function Synth_Discrete_Range_Expression
+     (Syn_Inst : Synth_Instance_Acc; Rng : Node) return Discrete_Range_Type;
+   function Synth_Float_Range_Expression
+     (Syn_Inst : Synth_Instance_Acc; Rng : Node) return Float_Range_Type;
+
+   function Synth_Array_Attribute (Syn_Inst : Synth_Instance_Acc; Attr : Node)
+                                  return Bound_Type;
+
+   procedure Synth_Discrete_Range (Syn_Inst : Synth_Instance_Acc;
+                                   Bound : Node;
+                                   Rng : out Discrete_Range_Type);
+
+   function Synth_Bounds_From_Range (Syn_Inst : Synth_Instance_Acc;
+                                     Atype : Node) return Bound_Type;
+
+   function Synth_Array_Subtype_Indication
+     (Syn_Inst : Synth_Instance_Acc; Atype : Node) return Type_Acc;
+
+   procedure Synth_Subtype_Indication
+     (Syn_Inst : Synth_Instance_Acc; Atype : Node);
+   function Synth_Subtype_Indication
+     (Syn_Inst : Synth_Instance_Acc; Atype : Node) return Type_Acc;
+
+   procedure Elab_Type_Definition (Syn_Inst : Synth_Instance_Acc; Def : Node);
+   procedure Elab_Anonymous_Type_Definition
+     (Syn_Inst : Synth_Instance_Acc; Def : Node; St : Node);
+
+   --  Elaborate the type of DECL.
+   procedure Elab_Declaration_Type
+     (Syn_Inst : Synth_Instance_Acc; Decl : Node);
+end Elab.Vhdl_Types;