--- /dev/null
+/*******************************************************************************
+ * Copyright (c) 2010 Association for Decentralized Information Management in
+ * Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ * VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.spreadsheet.solver.formula.parser.ast;
+
+public enum AstNull implements AstValue {
+ NULL;
+
+ @Override
+ public <T> T accept(AstValueVisitor<T> v) {
+ return v.visit(this);
+ }
+
+}