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diff --git a/libsolidity/ast/ASTEnums.h b/libsolidity/ast/ASTEnums.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/>.
+*/
+/**
+ * @date 2017
+ * Enums for AST classes.
+ */
+
+#pragma once
+
+#include <libsolidity/interface/Exceptions.h>
+
+#include <string>
+
+namespace dev
+{
+namespace solidity
+{
+
+// How a function can mutate the EVM state.
+enum class StateMutability { View, NonPayable, Payable };
+
+inline std::string stateMutabilityToString(StateMutability const& _stateMutability)
+{
+	switch(_stateMutability)
+	{
+	case StateMutability::View:
+		return "view";
+	case StateMutability::NonPayable:
+		return "nonpayable";
+	case StateMutability::Payable:
+		return "payable";
+	default:
+		solAssert(false, "Unknown state mutability.");
+	}
+}
+
+}
+}