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diff --git a/libsolidity/ast/ASTForward.h b/libsolidity/ast/ASTForward.h
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+/*
+    This file is part of cpp-ethereum.
+
+    cpp-ethereum 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 3 of the License, or
+    (at your option) any later version.
+
+    cpp-ethereum 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 cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/**
+ * @author Christian <c@ethdev.com>
+ * @date 2014
+ * Forward-declarations of AST classes.
+ */
+
+#pragma once
+
+#include <string>
+#include <memory>
+#include <vector>
+
+// Forward-declare all AST node types
+
+namespace dev
+{
+namespace solidity
+{
+
+class ASTNode;
+class SourceUnit;
+class ImportDirective;
+class Declaration;
+class ContractDefinition;
+class InheritanceSpecifier;
+class StructDefinition;
+class EnumDefinition;
+class EnumValue;
+class ParameterList;
+class FunctionDefinition;
+class VariableDeclaration;
+class ModifierDefinition;
+class ModifierInvocation;
+class EventDefinition;
+class MagicVariableDeclaration;
+class TypeName;
+class ElementaryTypeName;
+class UserDefinedTypeName;
+class Mapping;
+class ArrayTypeName;
+class Statement;
+class Block;
+class PlaceholderStatement;
+class IfStatement;
+class BreakableStatement;
+class WhileStatement;
+class ForStatement;
+class Continue;
+class Break;
+class Return;
+class Throw;
+class VariableDeclarationStatement;
+class ExpressionStatement;
+class Expression;
+class Assignment;
+class TupleExpression;
+class UnaryOperation;
+class BinaryOperation;
+class FunctionCall;
+class NewExpression;
+class MemberAccess;
+class IndexAccess;
+class PrimaryExpression;
+class Identifier;
+class ElementaryTypeNameExpression;
+class Literal;
+
+class VariableScope;
+
+// Used as pointers to AST nodes, to be replaced by more clever pointers, e.g. pointers which do
+// not do reference counting but point to a special memory area that is completely released
+// explicitly.
+template <class T>
+using ASTPointer = std::shared_ptr<T>;
+
+using ASTString = std::string;
+
+
+}
+}