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diff --git a/libyul/optimiser/SyntacticalEquality.h b/libyul/optimiser/SyntacticalEquality.h
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+/*
+	This file is part of solidity.
+
+	solidity 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.
+
+	solidity 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 solidity.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/**
+ * Component that can compare ASTs for equality on a syntactic basis.
+ */
+
+#pragma once
+
+#include <libyul/ASTDataForward.h>
+
+#include <vector>
+
+namespace dev
+{
+namespace yul
+{
+
+/**
+ * Component that can compare ASTs for equality on a syntactic basis.
+ * Ignores source locations but requires exact matches otherwise.
+ *
+ * TODO: Only implemented for Expressions for now.
+ * A future version might also recognize renamed variables and thus could be used to
+ * remove duplicate functions.
+ */
+class SyntacticalEqualityChecker
+{
+public:
+	static bool equal(Expression const& _e1, Expression const& _e2);
+
+protected:
+	static bool equalVector(std::vector<Expression> const& _e1, std::vector<Expression> const& _e2);
+};
+
+}
+}