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diff --git a/ASTUtils.h b/ASTUtils.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 2015
+ * Utilities to work with the AST.
+ */
+
+#pragma once
+
+#include <libevmcore/SourceLocation.h>
+#include <libsolidity/ASTVisitor.h>
+
+namespace dev
+{
+namespace solidity
+{
+
+class LocationFinder: private ASTConstVisitor
+{
+public:
+	LocationFinder(SourceLocation const& _location, std::vector<ASTNode const*> _rootNodes):
+		m_rootNodes(_rootNodes), m_location(_location)
+	{
+	}
+
+	/// @returns the "closest" (in the sense of most-leafward) AST node which is a descendant of
+	/// _node and whose source location contains _location.
+	ASTNode const* leastUpperBound();
+
+private:
+	bool visitNode(ASTNode const& _node);
+
+	std::vector<ASTNode const*> m_rootNodes;
+	SourceLocation m_location;
+	ASTNode const* m_bestMatch = nullptr;
+};
+
+}
+}